EB 2185 EN
Translation of original instructions

Type 2439 Safety Temperature Limiter (STL)
Self-operated Regulators

Edition August 2024

Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices. The images shown inthese instructions are for illustration purposes only. The actual product may vary.
Î For the safe and proper use of these instructions, read them carefully and keep them forlater reference.
Î If you have any questions about these instructions, contact SAMSON‘s After-sales Service(aftersalesservice@samsongroup.com).

Documents relating to the device, such as the mounting and operating
instructions, are available on our website at www.samsongroup.com >Downloads > Documentation.

Definition of signal words! DANGER
Hazardous situations which, if not avoided,
will result in death or serious injury! WARNING
Hazardous situations which, if not avoided,
could result in death or serious injury! NOTICE
Property damage message or malfunction
Note
Additional information
Tip
Recommended action

EB 2185 EN

Contents

1
1.1
1.2
1.3

Safety instructions and measures....................................................................5
Notes on possible severe personal injury..........................................................8
Notes on possible personal injury....................................................................8
Notes on possible property damage.................................................................9

2
2.1
2.2
2.3

Markings on the device................................................................................11
Inscription....................................................................................................11
Location of the inscription..............................................................................11
Material identification number.......................................................................11

3
3.1
3.2

Design and principle of operation.................................................................12
Technical data..............................................................................................14
Process medium and scope of application.......................................................14

4
4.1
4.2
4.3
4.4

Measures for preparation.............................................................................22
Unpacking...................................................................................................22
Transporting and lifting.................................................................................22
Storage........................................................................................................22
Preparation for installation.............................................................................23

5

Mounting and start-up..................................................................................23

6
6.1
6.2
6.3
6.3.1
6.4
6.4.1
6.4.2

Assembling the safety temperature limiter and valve.....................................23
Additional fittings..........................................................................................24
Temperature sensor and capillary tube............................................................25
Electric signal transmitter...............................................................................26
Retrofitting a signal transmitter.......................................................................26
Start-up........................................................................................................26
Gases and liquids.........................................................................................27
Steam..........................................................................................................27

7
7.1
7.1.1
7.1.2
7.2
7.3
7.4
7.5

Operation....................................................................................................27
Adjusting the limit temperature.......................................................................27
Adjusting the temperature limit without using a heating bath............................28
Adjusting the temperature limit using a heating bath........................................28
Unlocking after a fault...................................................................................30
Sensor failure...............................................................................................30
Servicing......................................................................................................31
Preparation for return shipment......................................................................32

8

Malfunctions................................................................................................32

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Contents

9
9.1
9.2

Decommissioning and removal.....................................................................34
Decommissioning..........................................................................................34
Disposal.......................................................................................................35

10
10.1
10.2
10.3

Appendix.....................................................................................................36
After-sales service and spare parts.................................................................36
Tightening torques.........................................................................................36
Certificates...................................................................................................36

EB 2185 EN

Safety instructions and measures

1 Safety instructions and measures
Intended use
The Type 2439 Safety Temperature Limiter (STL) with valve is designed to limit the temperature of the energy supply to heat generators (e.g. heat exchangers) by closing the valve. The
connection of an additional Type 2430 Control Thermostat converts the safety temperature
limiter into a temperature regulator with safety temperature limiter (TR/STL).
The devices are designed to operate under exactly defined conditions (e.g. operatingpressure, process medium, temperature). Therefore, operators must ensure that the devices
are only used in operating conditions that meet the specifications used for sizing the devices
at the ordering stage. In case operators intend to use the devices in applications orconditions other than those specified, contact SAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use thedevice for its intended purpose or for damage caused by external forces or any otherexternal factors.
Î Refer to the technical data and inscription on the device for limits and fields of application as well as possible uses.
Reasonably foreseeable misuse
The devices are not suitable for use outside the limits defined during configuration and by thetechnical data. Furthermore, the following activities do not comply with the intended use:
− Use of non-original spare parts− Performing service and repair work not described
Qualifications of operating personnel
The devices must be mounted, started up, serviced and repaired by fully trained andqualified personnel only; the accepted industry codes and practices are to be observed.
According to these mounting and operating instructions, trained personnel refers toindividuals who are able to judge the work they are assigned to and recognize possible
hazards due to their specialized training, their knowledge and experience as well as theirknowledge of the applicable standards.

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5

Safety instructions and measures

Personal protective equipment
SAMSON recommends checking the hazards posed by the process medium being used (e.g.
u GESTIS (CLP) hazardous substances database).
Î Provide protective equipment (e.g. safety gloves, eye protection) appropriate for the process medium used.
Î Wear hearing protection when working near the valve.
Î Check with the plant operator for details on further protective equipment.
Revisions and other modifications
Revisions, conversions or other modifications of the product are not authorized by SAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example.
Furthermore, the product may no longer meet the requirements for its intended use.
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the device by the process medium, the operatingpressure or by moving parts by taking appropriate precautions. Plant operators and operating personnel must observe all hazard statements, warnings and caution notes in thesemounting and operating instructions, especially for installation, start-up and service work.
SAMSON also recommends checking the hazards posed by the process medium being used
(e.g. u GESTIS (CLP) hazardous substances database).
Î Observe safety measures for handling the device as well as fire prevention and explosion
protection measures.
Responsibilities of the operator
Operators are responsible for proper use and compliance with the safety regulations. Operators are obliged to provide these mounting and operating instructions as well as the referenced documents to the operating personnel and to instruct them in proper operation. Furthermore, operators must ensure that operating personnel or third parties are not exposed toany danger.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions aswell as the referenced documents and observe the specified hazard statements, warnings
and caution notes. Furthermore, operating personnel must be familiar with the applicablehealth, safety and accident prevention regulations and comply with them.

6

EB 2185 EN

Safety instructions and measures

Referenced standards, directives and regulations
The devices comply with the requirements of the European Pressure Equipment Directive
2014/68/EU. Devices with a CE marking have an EU declaration of conformity, which includes information about the applied conformity assessment procedure. This EU declarationof conformity is included in the Appendix of these instructions (see Chapter 10.3).
Non-electric valve versions whose bodies are not lined with an insulating material coating do
not have their own potential ignition source according to the hazard assessment stipulated in
Clause 5.2 of ISO 80079-36, even in the rare incident of an operating fault. Therefore, suchvalve versions do not fall within the scope of Directive 2014/34/EU.
Î For connection to the equipotential bonding system, observe the requirements specified in
Clause 6.4 of EN 60079-14 (VDE 0165-1).
Referenced documents
The following documents apply in addition to these mounting and operating instructions:− Mounting and operating instructions for valves, e.g.
Type 2431 and Type 2432

u EB 2171

Types 2435, 2437 and 2436

u EB 2172

Type 2433

u EB 2173− Mounting and operating instructions for the control thermostat, e.g.
Type 2430

u EB 2430− Mounting and operating instructions for the safety temperature monitor, e.g.
Type 2403

u EB 2183− Mounting and operating instructions for the accessories, e.g.
Double adapter Do3 andmanual adjuster

EB 2185 EN

u EB 2176

7

Safety instructions and measures

1.1 Notes on possible severe personal injury! DANGER
Risk of bursting in pressure equipment.
Valves and pipelines are pressure equipment. Improper opening can lead to valve
components bursting.
Î Before starting any work on the valve, depressurize all plant sections affected aswell as the valve.
Î Drain the process medium from the plant sections affected as well as from thevalve.
Î Wear personal protective equipment.

1.2 Notes on possible personal injury! WARNING
Risk of personal injury due to residual process medium in the valve.
While working on the valve, residual medium can flow out of the valve and, depending on its properties, cause personal injury, e.g. (chemical) burns.
Î If possible, drain the process medium from the plant sections affected and from thevalve.
Î Wear protective clothing, safety gloves and eye protection.
Risk of burn injuries due to hot or cold components and pipelines.
Depending on the process medium, valve components and pipelines may get very hotor cold and cause burn injuries.
Î Allow components and pipelines to cool down or warm up to the ambient temperature.
Î Wear protective clothing and safety gloves.

8

EB 2185 EN

Safety instructions and measures

Damage to health relating to the REACH regulation.
If a SAMSON device contains a substance listed as a substance of very high concern
on the candidate list of the REACH regulation, this is indicated on the SAMSON delivery note.
Î Information on the safe use of the part affectedu https://www.samsongroup.com/en/about-samson/environment-socialgovernance/material-compliance/reach-regulation/.

1.3 Notes on possible property damage! NOTICE
Risk of valve damage due to unsuitable medium properties.
The valve is designed for a process medium with defined properties.
Î Only use the process medium specified for sizing the equipment.
Risk of irreparable regulator damage caused by the regulator components being
taken apart.
The safety temperature limiter is an inseparable hydraulic unit consisting of a safety
thermostat, capillary tube and temperature sensor. If these components are dismantled(e.g. removal of the capillary tube), the regulator will be irreparably damaged and will
no longer be able to fulfill its monitoring and control task.
Î Do not dismantle the regulator.
Î Only perform allowed activities on the regulator.
Î Contact SAMSON's After-sales Service before replacing spare parts.
Risk of valve damage due to contamination (e.g. solid particles) in the pipeline.
The plant operator is responsible for cleaning the pipelines in the plant.
Î Flush the pipelines before start-up.
Î Observe the maximum permissible pressure for valve and plant.

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9

Safety instructions and measures

Risk of damage to the valve or safety temperature limiter due to over- or under-torquing.
The connection between valve and safety temperature limiter must be tightened with acertain tightening torque.
Excessive tightening torques lead to parts wearing out more quickly. Parts that are tooloose may cause leakage.
Î Observe the specified tightening torques.

10

EB 2185 EN

Markings on the device

2 Markings on the device
The inscription shown was up to date at the time of publication of this document. The
inscription on the device may differ from the one shown.

2.1 Inscription
Specifications on the scaled cap on the adjustment knob to adjust the limit
1 Model number
12
3

2 Type designation
7

3 Material number/configuration ID
4 Limit range in °C and °F

98

5 Register number (device function)
6 DIN-tested marking

4

7 Year of manufacture
6

5

8 Certification body
9 CE marking

Fig. 1:

Inscription

2.2 Location of the inscription
Top view
Type 2439
Location of theinscription

Fig. 2:

Location of the inscription

2.3 Material identification number
Specifying the material number, you can contact SAMSON to find out which material isused. The material number is included in the inscription (item 2).
For more details on the inscription (see Fig. 1).

EB 2185 EN

11

Design and principle of operation

3 Design and principle of operation
See Fig. 3.
The safety temperature limiter limits thetemperature by closing and locking a valve
connected to the thermostat. The safety
temperature limiter works according to theadsorption principle (gas expansion). The
temperature sensor (12), capillary tube (10)and operating element (8) of the set point
adjuster are filled with an expansion gas.
The temperature-dependent change in volume of the gas in the bulb sensor (12) causes the piston in the operating element (8) of
the set point adjuster to move. As a result,the pin of the operating element moves theplug stem (4) with the plug (3).

Fail-safe action
The spring mechanism in the operating element is released when the capillary tube
breaks or when there is a leak in the sensor.
It moves the plug stem (4) with the plug (3)over the pin of the operating element andcloses and locks the valve. It is not possible
to unlock the valve if the capillary tube has
ruptured or there is a leak in the sensor system.
Note
The adjusted limit temperature must have aminimum temperature difference of 15 K to
the set point of the temperature regulator.

The temperature limit can be adjusted byturning the set point adjuster (8). This limit
value is indicated on the scale (11).
The valve is locked by a spring mechanism
when the temperature reaches the adjustable
limit, when the capillary tube ruptures orthere is a leak in the sensor system.
The device can only be reset and put backinto operation when the fault has been
remedied and the temperature has fallen
below the limit (approx. 15 K below theadjusted temperature limit).

12

EB 2185 EN

Design and principle of operation

V
2
1.1
15

3
4
5

18
17

10
8

13

16

12
1

20

2

3

4

11
STB

19

15
18
10 17

TR

13
12

V

Valve

10 Capillary tube

STL Type 2439 Safety Temperature Limiter

11 Scale

TR Type 2430 Control Thermostat (optional)

12 Temperature sensor

1.1 Threaded ends or welding ends
(optional)

13 Thermowell2

Valve seat

3

Plug

16 Opening for indication/unlocking

4

Plug stem

5

Plug spring

8

Operating element with set point
adjusterFig. 3:15 Coupling nut
17 Screw fitting
18 Packing
19 Opening for lead-sealing
20 Electric signal transmitter (optional)

Combination as temperature regulator with safety temperature limiter (TR/STL) and electric
signal transmitter

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13

Design and principle of operation

3.1 Technical data
3.2 Process medium and scopeof application
Safety temperature monitoring of the energy
supply to heat generators or heat exchangers by closing the valve− Limit signals from 10 to 120 °C− Nominal sizes DN 15 to 50− PN 16 to 25− Max. 200 °C
The Type 2439 Safety Temperature Limiter(STL) with a valve operates without auxiliary
energy and is designed for extended safetyaccording to DIN EN 14597. The valve isclosed by a spring mechanism when thetemperature reaches the adjusted limit, when
the capillary tube breaks or when leakage
occurs in the sensor system. The limiter can
only be unlocked and put back into
operation with a screwdriver after the fault
has been remedied and the temperature has
fallen below the limit.

Dimensions and weights
Fig. 4 provides a summary of the dimensions
for the Type 2439 Safety Temperature Limiterand the Types 2431, 2432, 2433, 2435,
2436 and 2437 Valves. The lengths andheights in the dimensional drawings areshown on page 18 onwards.
Typetesting
The safety temperature limiter combined withthe valve has been tested by the German
technical surveillance association TÜV according to DIN EN 14597 under the typedesignation 2750-1.
The registration number is available on request.
Note
Further details and technical data of thevalves and control thermostats are listed in
the following mounting and operating instructions:See ‘Referenced documents’ on page 7.

Install the sensor together with the supplied
thermowell.
When the safety temperature limiter is
combined with a Type 2430 Control
Thermostat, make sure that there is aminimum difference of approximately +15 K
between the limit temperature of thetemperature limiter and the set pointtemperature of the control thermostat.

14

EB 2185 EN

Design and principle of operation

Table 1: Technical data · Type 2439 Safety Temperature Limiter (STL)
Type 2439 Safety Temperature Limiter
Adjustment ranges of limit temperature

10 to 95 °C · 20 to 120 °C

Permissible ambient temperature range at
the limit value adjuster

80 °C · With electric signal transmitter 60 °C

Permissible temperature at sensor

20 K above the adjusted limit

Permissible pressure at the sensor withthermowell

40 barCapillary tube length

2m·5m

Switching cycles according to
DIN EN 14597

500

Electric signal transmitterMax. load 230 V~, 16 A with resistive load

Conformity·

Table 2: Technical data · Types 2431, 2432, 2433, 2435, 2436 and 2137 Valves
Valve

Types 2431, 2432, 2433, 2435, 2436 and 2137

Pressure rating

PN 16 to 25

Conformity
Connection size

·
G

½

¾

1

Type 2431

u T 2171

Type 2433

u T 2173

Type 2435
Type 2436

u T 2172

Nominal size

DN

15

20

25

32

Type 2432

u T 2171

Type 2433

u T 2173

Type 2436
Type 2437

u T 2172

EB 2185 EN

40

50

15

Design and principle of operation

Table 3: Female thread · Dimensions in mm and weights in kg · Type 2431/2439,
Type 2433/2439, Type 2435/2439 and Type 2436/2439
Connection size

G

½

L

65

¾

Valve bodyType 2433/2439
Type 2435/2439
Type 2436/2439

½

¾

90

65

CC499K

LengthType 2431/2439

1

75

Height H

1.4408 · A351 CF8M
75

180

180

Height H1

30

50Height H

165

Height H1

40

Height H

255

Height H1

30

Height H

180

Height H1

30

1
90

–

180
50

Type 2431/2439 kg (approx.)

1.9

2.0

2.1

Type 2433/2439 kg (approx.)

2.1

2.2

2.3

Type 2435/2439 kg (approx.)

2.4

2.5

2.6

Type 2436/2439 kg (approx.)

2.3

2.4

2.5

2.0

2.1

2.3

–
2.1

2.2

2.4

Table 4: Male thread · Dimensions in mm · Type 2432/2439, Type 2433/2439,
Type 2436/2439 and Type 2437/2439
Nominal size

DN

15

20

25

32

40

50

Pipe Ø d

21.3

26.8

32.7

AF

30

42.0

48.0

60.0

36

46

59

65

82

Valve body

CC499K

Face-to-face dimensions

L

65

70

90

100

110

130

Face-to-face dimensions
with welding ends

L1

210

234

244

268

294

330

Face-to-face dimensions
with threaded ends

L2

129

144

159

180

196

228

A

G½

G¾

G1

G 1¼

G 1½

G2

Male threadType 2432/2439

Type 2433/2439

Type 2436/2439
Type 2437/2439

16

Height H

175

225

Height H1

30

55

Height H

171

181

Height H2

112

122

124

144

157

165

Height H3

72

77

82

105

110

115

Height H
Height H1

–

195
95

Height H

255

305

Height H1

30

55

EB 2185 EN

Design and principle of operation

Table 5: Male thread · Weights in kg · Type 2432/2439, Type 2433/2439,
Type 2436/2439 and Type 2437/2439
Nominal size

DN

15

20

25

32

40

50

Welding ends

2.2

2.5

2.8

Threaded ends

2.1

4.9

5.5

7.3

2.4

2.7

4.7

5.4

Welding ends

7.3

2.8

3.1

3.3

4.6

4.9

Threaded ends

6.2

2.8

3.1

3.3

4.6

4.9

6.2

3.8

4.2

4.6

3.8

4.2

4.6

Valve bodyType 2432/
2439 with …
Type 2433/2439
with …
Type 2436/2439
with …
Type 2437/2439
with …

CC499K

Welding ends–

Threaded ends
Welding ends

2.4

2.7

3.0

5.2

5.9

7.8

Threaded ends

2.3

2.6

2.9

5.5

5.9

7.8

Table 6: Flanges · Dimensions in mm · Type 2432/2439, Type 2433/2439,
Type 2436/2439 and Type 2437/2439
Nominal size

DN

15

20

25

32

40

50

Face-to-facedimensions

L3

130

150

160

180

200

230

Valve bodyType 2433/2439

CC499K 1)
Height H
Height H4

171
72

80

Valve body

181
82

105

EN-GJS-400-18-LT

110

Type 2432/2439

Height H

180

230

Type 2436/2439

Height H

180

230

Type 2437/2439

Height H

260

Valve body
Height H

180

Type 2436/2439

Height H

180

1)
2)

310
1.4408 · A351 CF8M

Type 2432/2439

–

115

2)

180
180

2)

–

With screwed-on flanges
With flanged body

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17

Design and principle of operation

Table 7: Flanges · Weights in kg · Type 2432/2439, Type 2433/2439, Type 2436/2439
and Type 2437/2439
Nominal size

DN

15

20

25

32

40

50

8.2

9.7

11.6

Valve bodyType 2432/2439
Type 2433/2439
Type 2436/2439
Type 2437/2439

EN-GJS-400-18-LT
1.4408 · A351 CF8M
CC499K
EN-GJS-400-18-LT
1.4408 · A351 CF8M
EN-GJS-400-18-LT

3.9
4.9
4.0
4.0

4.4
–
6.1
4.6
–
4.7

5.0

–

7.1
5.1

9.4

10.9

13.7

8.3

9.8

11.7

8.3

10.0

–

5.1

11.3

Table 8: Dimensions in mm · Weights in kg · Type 2439 and Type 2430
Type 2439 Safety Temperature Limiter · Type 2430 Control Thermostat
Nominal size

Type 2439

Type 2430

G ½ to G 1 · DN 15 to 25

DN 32 to 50

Height H4

130

Length L5

185

Length B

210

Length B1

190

G

G½

M

M32x1.5ØT

12

Height H6

130

Length L5

185

220

G

G½

G¾

ØT

12

19

Type 2439

kg (approx.)

1.2

Type 2430

kg (approx.)

0.9

18

EB 2185 EN

Design and principle of operation

Dimensional drawings
L

L1
L

H1

H1
H

2431/2439
Female thread
Fig. 4:

d
SW

L3

L2
L
H1

A
SW

H

H

2432/2439
With welding ends

2432/2439
With threaded ends

H

2432/2439
Flanged body

Dimensional drawings for Type 2439

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19

Design and principle of operation

Dimensional drawings
L

L2
L

L1
L

H1

H2
H

2433/2439
Female thread

A
SW

L

d

H1

A
SW

SW

H

H

2436/2439
With welding ends

2436/2439
With threaded ends

L2
L

H1

20

d

L1
L

H

L2
L

H1

2436/2439
Female threadH

2433/2439
With screwed-on
flanges

L1
L

H

L3

SW

H

2433/2439
With threaded ends

H1

H

Fig. 4:

SW

H

L

H1

2436/2439
Flanged body

H4

H3

d

2433/2439
With welding ends

2435/2439
Female thread

L3

L3

H1

A
SW

SW
H

H

2437/2439
With welding ends

2437/2439
With threaded ends

H

2437/2439
Flanged body

Dimensional drawings for Type 2439

EB 2185 EN

Design and principle of operation

Dimensional drawings
M

SW17

SW22

SW34

G

G

H4

L5

L5

H6
M
B1
B

ØT
ØT

Type 2439 Safety Temperature Limiter
Fig. 4:

Type 2430/2439 Control Thermostat with STL

Dimensional drawings for Type 2439

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21

Measures for preparation

4 Measures for preparation
After receiving the shipment, proceed as follows:
1. Check the scope of delivery. Compare
the shipment received with the deliverynote.
2. Check the shipment for transportation
damage. Report any damage to
SAMSON and the forwarding agent(refer to delivery note).

4.1 Unpacking
Note
Do not remove the packaging until immediately before mounting it onto the valve.
Proceed as follows to lift and mount the device:
1. Remove the packaging from the device.
2. Dispose of the packaging in accordancewith the valid regulations.

4.2 Transporting and lifting
Due to the low service weight, lifting equipment is not required to lift and transport thesafety temperature limiter (e.g. to mount it
onto the valve).
Transport instructions− Protect the device against external influences (e.g. impact).

− Observe the permissible ambient temperatures (see Chapter 3.2).

4.3 Storage! NOTICE
Risk of damage to the safety temperature
limiter due to improper storage.
− Observe the storage instructions.
− Avoid longer storage periods.
− Contact SAMSON in case of different storage conditions or longer storage times.
Note
SAMSON recommends to regularly checkthe device and the prevailing storage conditions during long storage periods.
Storage instructions− Protect the safety temperature limiter
against external influences (e.g. impact).
− Protect the device against moisture anddirt. Store it at a relative humidity of lessthan 75 %. In damp spaces, prevent condensation. If necessary, use a drying
agent or heating.
− Make sure that the ambient air is free ofacids or other corrosive media.
− Observe the permissible ambient temperatures (see Chapter 3.2).
− Do not place any objects on the device.

− Protect the device against moisture and
dirt.

22

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Mounting and start-up

Tip
Our after-sales service can provide more detailed storage instructions on request.

4.4 Preparation for installation
Proceed as follows:Î Check to ensure that the connection forthe safety temperature limiter at the valve
is clean.
Î Check the safety temperature limiter fordamage.
Î Check to make sure that the type designation, pressure rating and temperature
range of the safety temperature limiter
match the plant conditions (nominal sizeand pressure rating of the pipeline, medium temperature etc.).
Î Check any mounted thermometers tomake sure they function.

5 Mounting and start-up! NOTICE
Risk of overheating due to excessive ambient
temperatures or insufficient heat dissipation
when components are insulated.
Do not include the safety temperature limiterin the insulation of the pipeline.

6 Assembling the safety temperature limiter and valve
See Fig. 3.
The Type 2439 Safety Temperature Limiter isalways installed in combination with a valve
as a safety temperature regulator (STL). The
operating element with the spring mechanism (STL) can be attached to the valve bodyusing the coupling nut (15) either before orafter the valve is installed in the pipeline.
The following points must be observed
during installation:
Î Observe the permissible ambient temperature range from 0 to 80 °C (0 to
60 °C when an signal transmitter isused).
Î Make sure that the regulator remains
freely accessible after the plant has been
completed.
Î Install the valve in a horizontal pipeline
with the operating element connectionsuspended downward (see Table 2).

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23

Assembling the safety temperature limiter and valve

Note
Do not put the safety temperature regulators(STL) into operation before mounting thevalve and control thermostat.
! NOTICE
Risk of damage to the valve or safety temperature limiter due to over- or under-torquing.
The connection between valve and safety
temperature limiter must be tightened with acertain tightening torque. Excessive tightening torques lead to parts wearing out more
quickly. Parts that are too loose may cause
leakage.
Observe the specified tightening torques.

6.1 Additional fittings
Strainer
A strainer installed upstream in the flow pipe
holds back any dirt or other foreign particles
carried along by the medium. For example,
the SAMSON Type 1 NI Strainer is suitable(u T 1010).
The following points must be observed when
installing the strainer:− Do not use the strainer to permanently
filter the process medium.
− Install the strainer upstream of the regulator.
− Allow sufficient space to remove the filter.
− Observe the flow direction through thestrainer.
− In horizontal pipelines with gases or liquids, the filter element faces downward.
The filter element faces sideways in applications with steam.
− Install strainers in vertical pipelines withthe medium flowing upward with thecover facing upward.
Shut-off valve
Install a hand-operated shut-off valve both
upstream of the strainer and downstream of
the regulator. This allows the plant to be shut
down for cleaning and maintenance, andwhen the plant is not used for longer periodsof time.
Thermometer
Install a thermometer both upstream anddownstream of the regulator to monitor thetemperatures prevailing in the plant.

24

EB 2185 EN

Assembling the safety temperature limiter and valve

6.2 Temperature sensor andcapillary tube
! NOTICE− Seal the thermowell into the welding
socket.
! NOTICE

Risk of irreparable regulator damage
caused by the regulator components being
taken apart.
Do not separate the safety thermostat fromthe capillary tube or temperature sensor.

Galvanic corrosion due to incorrectly
selected materials of the mounting parts.
On installing the thermowell in the pipeline,
only use similar materials (e.g. stainless steel
with stainless steel or copper together withother copper materials).

Temperature sensor

Capillary tube

The temperature sensor may be installed ineither a horizontal or vertical position. However, make sure its entire length is immersedin the process medium to be controlled. It
must be installed in a location where overheating or considerable idling times cannot
occur.
For temperature regulators with safety temperature limiter (TR/STL), install the sensor of
the limiter near the temperature sensor of theregulator.

Carefully run the capillary tube (10) without
bending or twisting it. Avoid locations withconsiderable ambient temperature fluctuations along the entire length of the tube.
! NOTICE
Do not damage or shorten the capillary
tube. Roll up excess tube to form a ring. The
smallest permissible bending radius is
50 mm.

− Weld a welding socket with G ½ female
thread at the place of installation.
− For better heat transmission, we recommend filling the free space between sensor and thermowell with oil or, when installed horizontally, with grease or any
other heat transfer medium. This prevents
heat transfer delays. Observe the thermal expansion of the filling medium. Allow some space for expansion and do
not fill the entire free space or slightly
loosen sensor nut for pressure compensation.

EB 2185 EN

25

Assembling the safety temperature limiter and valve

6.3 Electric signal transmitter
The safety temperature limiter can be delivered with an electric signal transmitter (20)already fitted. The signal transmitter contains
a microswitch (max. load 10 A, 125 V,
250 V) which generates a signal if the temperature limit is exceeded or if the sensor
fails (capillary tube is broken).
Wire the microswitch according to Fig. 5.

6.4 Start-up! WARNING
Risk of burn injuries due to hot or cold components and pipelines.
Depending on the process medium, valve
components and pipelines may get very hotor cold and cause burn injuries.
− Allow components and pipelines to cool
down or warm up to the ambient temperature.
− Wear protective clothing and safety gloves.

Brown: unlocked
Black
Blue or red 1)
locked1)

Depending on date of manufacture

Fig. 5:

Circuit diagram for signal transmitter

6.3.1

Retrofitting a signaltransmitter

It is not possible to retrofit the electric signaltransmitter (20).

! NOTICE
Malfunction and damage due to adverse
weather conditions (temperature, humidity).
Do not install the safety temperature limiteroutdoors or in rooms prone to frost. If such alocation cannot be avoided, protect theregulator against freezing up if the process
medium flowing through the valve can freeze
up. Either heat the regulator or remove itfrom the plant and completely drain theresidual medium.
! NOTICE
Risk of the valve being destroyed by steam
hammering.
− Drain off any condensate in the pipeline.
− Vent the plant.
Î Fill the plant very slowly with the process
medium on start-up.
Once the safety temperature limiter is mounted onto the valve, it can be put into operation.

26

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Operation

6.4.1

Gases and liquidsÎ Open the shut-off valves slowly preferably starting from the upstream pressureside.
Î Avoid pressure surges.

6.4.2

Steam

Î Completely drain and dry steam lines toprevent water hammering.
Î Slowly allow the steam to enter the plant
to ensure that the pipes and valves warm
up evenly and to avoid excessive flow
velocities.
Î Before the full capacity is reached, drain
off the start-up condensate.
Î Make sure that the air contained in theplant escapes as quickly as possible.
Î Open the shut-off valves slowly preferably starting from the upstream pressureside.
Î Avoid pressure surges.

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7 Operation
See Fig. 3.

7.1 Adjusting the limit
temperature
The safety temperature limiter is adjusted to
the limit value specified in the order.
If no value is specified, the following limit
value is ready adjusted:− 10 to 95 °C range to 90 °C− 20 to 120 °C range to 110 °C
Note
When the safety temperature limiter is combined with a Type 2430 Control Thermostat,
make sure that there is a minimum differenceof approximately +15 K between the limit
temperature of the temperature limiter andthe set point temperature of the control thermostat.

27

Operation

7.1.1

Adjusting the temperature limit without using
a heating bath

7.1.2

Adjusting thetemperature limit using
a heating bathIf another temperature limit is to be adjusted
without using a heating bath, turn the black
plastic ring according to the scale (see Table 9). To do this, proceed as follows:

If the temperature limit of the safety temperature limiter is to be adjusted precisely using aheating bath or a deviation in the limit value
exists, proceed as follows:

1. If a sealing wire (19) exists (optional), remove it.

1. Remove the sensor from the thermowell.

2. Adjust the new limit value (see Table 9)at the set point adjuster (8).

2. When a Type 2430 Control Thermostat
or double adapter is used, unscrew itfrom the safety temperature limiter.

Turn clockwise () to reduce thetemperature

3. Remove the safety temperature limiterfrom the valve.

Turn counterclockwise () to increase
the temperature

4. If a sealing wire (19) is used, remove it.

3. Lead-seal the safety temperature limiter(optional).
4. Make sure the minimum temperature difference is observed for the TR/STL.
Note
Before adjusting the limit value, the safety
temperature limiter must be mounted on thevalve.
The setting is continuously adjustable. A turncorresponds to approx. 3.2 K or 3.9 K depending on the limit range (see Table 9).

28

5. Turn the set point adjuster (8) counterclockwise () to adjust the maximum
possible limit value (see Chapter 7.1).
6. Immerse the sensor of the safety temperature limiter completely (for at least
five minutes) into the heating bath withthe correct temperature.
7. Check whether the safety temperature
limiter has been triggered.
8. When the safety temperature limiter has
not been triggered:
Reduce the limit value by slowly turning(¼ turn at a time) the set point adjuster(8) clockwise () until the safety temperature limiter is triggered.

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Operation

9. When the safety temperature limiter has
been triggered:
10. Let the safety temperature limiter cool
down again, unlock it and mount it backonto the valve.
11. Install the sensor again into the thermowell.
12. Lead-seal the safety temperature limiter(optional).

Note
When the safety temperature limiter is combined with a Type 2430 Control Thermostat,
make sure that there is a minimum differenceof approximately +15 K between the limit
temperature of the temperature limiter andthe set point temperature of the control thermostat.

13. When a Type 2430 Control Thermostat
or double adapter is used, screw it onto
the safety temperature limiter.
14. Make sure the minimum temperature difference is observed for the TR/STL.

Table 9: Limit adjustment · Adjustment diagram
Limit range
20 to
120 °C

0

~5 °C

~5 °C

1

~25 °C~35 °C~50 °C~65 °C~75 °C~95 °C~95 °C~130 °C

~3.2

~3.9

4 3

10 to
95 °C

2

Scale marking

Change of limit
range inK/turnEB 2185 EN

°C
140
120

20…120 °C

100

10…95 °C

80
60
40
20
0

0

1

2

3

4

Turns
(scale divisions)29

Operation

7.2 Unlocking after a fault

7.3 Sensor failure

A red cam visible in the opening (16 in Fig.
3) indicates that the valve is locked.

Indication of a defective sensor

After the fault has been remedied, a screwdriver is required to unlock the safety temperature limiter (Fig. 6).
Place the screwdriver through the opening
onto the cam and lever the cam to unlock it.
A clicking noise can be heard and the red
cam disappears.
Note
The valve can only be unlocked after thetemperature limit has fallen below the adjusted limit value by at least 15 K.

When the sensor is defective (e.g. a leak inthe sensor system), a red cam becomes visible in the opening (16) and the valve islocked. The valve cannot be unlocked when
the sensor system is defective. The device
must be replaced.
Note
If the hydraulic system of the Type 2439 is
defective (pressure loss), the STL cannot be
unlocked as a result. It must be replaced witha new device.

Opening

Red camScrewdriverFig. 6:30

UnlockingEB 2185 EN

Operation

7.4 Servicing
The safety temperature limiter does not require any maintenance. Nevertheless, it issubject to natural wear, particularly at thesoldered joints.
! WARNING
Risk of burn injuries due to hot or cold
components and pipeline.
Valve components and the pipeline may become very hot or cold. Risk of burn injuries.
− Allow components and pipelines to cool
down or warm up to the ambient temperature.
− Wear protective clothing and safety gloves.

Note
The safety temperature limiter was checkedby SAMSON before it left the factory.
− Certain test results certified by SAMSON
lose their validity when the safety temperature limiter is opened.
− The certification according to
DIN EN 14597 loses its validity when thesafety temperature limiter is opened.
Tip
SAMSON's After-sales Service can support
you in drawing up an inspection and test
plan for your plant.

! NOTICE
Risk of damage to the valve or safety
temperature limiter due to over- or undertorquing.
The connection between valve and safety
temperature limiter must be tightened with acertain tightening torque. Excessive tightening torques lead to parts wearing out more
quickly. Parts that are too loose may cause
leakage.
Observe the specified tightening torques.

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31

Malfunctions

7.5 Preparation for return ship- 8 Malfunctions
ment
The malfunctions listed in Table 10 are
Defective devices can be returned to
SAMSON for repair. Proceed as follows toreturn devices to SAMSON:
1. Put the device out of operation (seeChapter 9.1).
2. Decontaminate the valve. Remove any
residual process medium.
3. Fill in the Declaration on Contamination.
The declaration form can be downloaded from our website at u www.samsongroup.com > Service > After-sales
Service.
4. Continue as described on our website atu www.samsongroup.com > SERVICE >After-sales Service > Returning goods.

caused by mechanical faults and incorrect
regulator sizing. In the simplest case, thefunctioning can be restored following therecommended action. Special tools may berequired for repair work.
Exceptional operating and installation conditions may lead to changed situations that
may affect the control response and lead tomalfunctions. For troubleshooting, the conditions, such as installation, process medium,
temperature and pressure conditions, must
be taken into account.
SAMSON's After-sales Service can help
during troubleshooting. Further information
is available in Chapter 10.
Note
If the hydraulic system of the Type 2439 is
defective (pressure loss), the STL cannot be
unlocked as a result. It must be replaced witha new device.
Tip
SAMSON's After-sales Service can support
you in drawing up an inspection and test
plan for your plant.
Note
Contact SAMSON's After-sales Service for
malfunctions not listed in the table.

32

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Malfunctions

Table 10: Troubleshooting
Malfunction

Possible reasons

Recommended action

Temperature sensor
installed in the wrong
location.

Î Install the temperature sensor into the pipeline insuch a way that the heat flow is correctly
measured.

Temperature exceeds the adjusted
Foreign particles blocking
limit.
the valve plug
Valve trim is worn out.
The temperature adjusted at thecontrol thermostat reaches theadjusted temperature limit.

Temperature drops below the set
point adjusted at the control
thermostat.

Î Remove foreign particles.
Î Replace damaged parts.
Î Replace damaged parts.

Control thermostat
defectiveÎ Replace the control thermostat.

Valve installed against theflow.

Î Install the valve so that the direction of flow
matches the direction indicated by the arrow on
the body.

Foreign particles blocking
the valve plugÎ Remove foreign particles.

Temperature sensor
installed in the wrong
location.

Î Install the temperature sensor into the pipeline insuch a way that the heat flow is correctly
measured.

Î Replace damaged parts.

Î Check the sizing.
Valve or KVS/CV coefficientÎ Change KVS/CV coefficient, if necessary or install
too smalla different sized regulator.
Strainer blocked
The safety temperature
limiter has been triggered.

Î Clean the strainer.
Î Check temperature regulator to ensure it
functions.
Î Check the set point of the control thermostat.
Î Replace the defective STL, if necessary.

Jerky control response.

Increased friction, e.g. due Î Remove foreign particles.
to foreign particles
Î Replace damaged parts.
between seat and plug.
Î Check the sizing.

Temperature fluctuates.

Leak at the joint between thevalve and safety temperature
limiter.

EB 2185 EN

Valve too large

Î Change KVS/CV coefficient, if necessary or installa different sized regulator.

Temperature sensor
installed in the wrong
location.

Î Install the temperature sensor into the pipeline insuch a way that the heat flow is correctly
measured (avoid dead times).

Seal is defectiveÎ Replace damaged parts.
Î Contact SAMSON's After-sales Service.

33

Decommissioning and removal

9 Decommissioning andremoval

9.1 Decommissioning! DANGER
Risk of bursting in pressure equipment.
Valves and pipelines are pressure equipment. Improper opening can lead to burstingof the valve.
− Before starting any work on the valve, depressurize all plant sections affected aswell as the valve.
− Drain the process medium from the plant
sections affected as well as from the valve.
− Wear personal protective equipment.

Steps 1 to 6 only apply when the thermowell is to be removed as well.

! WARNING
Risk of burn injuries due to hot or cold components and pipeline.
Valve components and the pipeline may become very hot or cold. Risk of burn injuries.
− Allow components and pipelines to cool
down or warm up to the ambient temperature.
− Wear protective clothing and safety gloves.

34

To decommission the safety temperature limiter before removing it, proceed as follows:

1. Close the shut-off valve on the upstreamside of the valve.
2. Close the shut-off valve on the downstream side of the valve.
3. Completely drain the pipelines andvalve.
4. Depressurize the plant.
5. If necessary, allow the pipeline and device to cool down or warm up to the ambient temperature.
6. Remove the thermowell from the pipeline
and, if necessary, seal the opening.
7. Pull the sensor out of the thermowell.
8. Remove the safety temperature limiterfrom the valve.

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Decommissioning and removal

9.2 Disposal
We are registered with theGerman national register for
waste electric equipment (stiftungear) as a producer of electricaland electronic equipment,
WEEE reg. no.: DE 62194439

Î Observe local, national and international refuse regulations.
Î Do not dispose of components, lubricantsand hazardous substances together withyour other household waste.
Note
SAMSON can provide you witha recycling passport according to
PAS 1049 on request. Simply e-mail us ataftersalesservice@samsongroup.com giving
details of your company address.
Tip
On request, SAMSON can appoint a service
provider to dismantle and recycle the product.

EB 2185 EN

35

Appendix

10 Appendix
10.1 After-sales service andspare parts

10.2 Tightening torques
Part

Nominal size

Tightening
torque in Nm

Coupling nut
(15)

All

20

After-sales service
Contact SAMSON's After-sales Service forsupport concerning service or repair work or
when malfunctions or defects arise.
E-mail10.3 Certificates
The EU declarations of conformity are included on the next pages.

You can reach our after-sales service ataftersalesservice@samsongroup.com.
Addresses of SAMSON AG and its subsidiaries
The addresses of SAMSON, its subsidiaries,
representatives and service facilities
worldwide can be found on our website(u www.samsongroup.com) or in all
SAMSON product catalogs.
To assist diagnosis and in case of an unclear
mounting situation, specify the following details (so far as possible). See Chapter 2:− Device type
− Model number or material number− Temperature and process medium− Is a strainer installed?
− Installation drawing showing the exact
location of the regulator and all the additionally installed components (shut-off
valves, pressure gauge etc.)
Spare parts
There are no spare parts available for thesafety temperature limiter.

36

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Appendix

Modul D/Module D, Nr./No. / N° CE-0062-PED-D-SAM 001-16-DEU-rev-A
SAMSON erklärt in alleiniger Verantwortung für folgende Produkte:/For the following products, SAMSON hereby declares
under its sole responsibility:
Sicherheitstemperaturbegrenzer STB 2439 (2750-1) / Safety Temperature Limiter STL 2439 (2750-1)
in Kombination mit Ventilen/combined with valves
2431, 2432, 2433, 2435, 2436, 2437, 2479, 2488 (2710, 2720, 2730)
die Konformität mit nachfolgender Anforderung/the conformity with the following requirement.
Richtlinie des Europäischen Parlaments und des Rates zur
Harmonisierung der Rechtsvorschriften der Mitgliedstaaten über die
Bereitstellung von Druckgeräten auf dem Markt.

2014/68/EU

vom 15.05.2014

Directive of the European Parliament and of the Council on theharmonization of the laws of the Member States relating of the making
available on the market of pressure equipment.

2014/68/EU

of 15 May 2014

EG-Baumusterprüfbescheinigung
EC Type Examination Certificate

Modul B
Module B

Zertifikat-Nr./Certificate no.
01 202 931-B-11-0016

Angewandtes Konformitätsbewertungsverfahren
Conformity assessment procedure applied

Modul D
Module D

Zertifikat-Nr./Certificate no.
CE-0062-PED-D-SAM-001-16-DEU-rev-A

Dem Entwurf zu Grunde gelegt sind Verfahren aus:/The design is based on the procedures specified in the following standards:
DIN EN 12516-2, DIN EN 12516-3 bzw./or ASME B16.1, ASME B16.24, ASME B16.42
Das Qualitätssicherungssystem des Herstellers wird von folgender benannter Stelle überwacht:

EU-Konformitaetserklaerung_Blatt-15_Modul-B_und_Modul-D_DE-EN_Rev.03_2017-02-08.docx

The manufacturer’s quality management system is monitored by the following notified body:

Bureau Veritas S.A. Nr./No. 0062, Newtime, 52 Boulevard du Parc, IIle de la Jatte, 92200 Neuilly sur Seine, France
Hersteller:/Manufacturer: SAMSON AG, Weismüllerstraße 3, 60314 Frankfurt am Main, Germany

Frankfurt am Main, 08. Februar 2017/08 February 2017

Klaus Hörschken
Zentralabteilungsleiter/Head of Central Department
Entwicklung Ventile und Antriebe/R&D, Valves and Actuators

SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3 60314 Frankfurt am Main

EB 2185 EN

Dr. Michael Heß
Zentralabteilungsleiter/Head of Central Department
Product Management & Technical Sales

Telefon: 069 4009-0 · Telefax: 069 4009-1507
E-Mail: samson@samson.de

Revision 03

37

Appendix

EU Konformitätserklärung / EU Declaration of Conformity /Déclaration UE de conformité
Die alleinige Verantwortung für die Ausstellung dieser Konformitätserklärung trägt der Hersteller/
This declaration of conformity is issued under the sole responsibility of the manufacturer/
La présente déclaration de conformité est établie sous la seule responsabilité du fabricant.
Für das folgende Produkt / For the following product / Nous certifions que le produit

Sicherheitstemperaturbegrenzer / Safety Temperatur Limiter /Limiteur de température de sécurité
Typ/Type/Type 2439
wird die Konformität mit den einschlägigen Harmonisierungsrechtsvorschriften der Union bestätigt /the conformity with the relevant Union harmonisation legislation is declared with/
est conforme à la législation d'harmonisation de l'Union applicable selon les normes:

EN 61000-6-2:2005, EN 61000-6-3:2007+A1:2011, EN 61326-1:2013

EMC 2014/30/EU
LVD 2014/35/EU

EN 60730-1:2016, EN 61010-1:2010

RoHS 2011/65/EU

EN 50581:2012

Hersteller / Manufacturer / Fabricant:
SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3D-60314 Frankfurt am Main
Deutschland/Germany/Allemagne

ce_2439-0_de_en_fra_rev07.pdf

Frankfurt / Francfort, 2017-07-29
Im Namen des Herstellers/ On behalf of the Manufacturer/ Au nom du fabricant.

Gert Nahler
Zentralabteilungsleiter/Head of Department/Chef du département
Entwicklung Automation und Integrationstechnologien/
Development Automation and Integration Technologies

SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3 60314 Frankfurt am Main

38

Hanno Zager
Leiter Qualitätssicherung/Head of Quality Managment/
Responsable de l'assurance de la qualité

Telefon: 069 4009-0 · Telefax: 069 4009-1507
E-Mail: samson@samson.de

Revison 07

EB 2185 EN

Appendix

HERSTELLERERKLÄRUNG

MANUFACTURER’S DECLARATION

Für folgende Produkte

For the following products

Temperaturregler mit/ohne Sicherheitstemperaturwächter oder -begrenzer

Temperature regulators with/without
safety temperature monitors/limiters

Nach der Zündgefahrenbewertung nach
DIN EN 13463-1 wird hiermit bestätigt, dass dieoben angegebenen Regler ohne Hilfsenergie keine
eigene potenzielle Zündquelle besitzen und damit
nicht der Gerätedefinition nach der Richtlinie
2014/34/EU entsprechen.

According to the ignition risk assessment basedon DIN EN 13463-1, we hereby certify that the
self-operated regulators mentioned above do nothave their own potential ignition source, and as aresult, they are not classified as “equipment” inthe sense of Directive 2014/34/EU.

Die Geräte fallen damit nicht unter die Richtlinie
2014/34/EU und können somit auch nicht als Geräte nach dem Verfahren der EGBaumusterprüfung nach Anhang III der Richtlinie
zertifiziert werden.

Since the devices do not fall within the scope of
Directive 2014/34/EU, they cannot be certified as"equipment" according to the EC type examination procedure specified in Annex III of the Directive.

Diese Erklärung gilt für die Gerätetypen nach Tabelle 1 die entsprechend den bausatzmäßigen
Unterlagen gefertigt sind.

This declaration applies to the device types listed
in Table 1 manufactured in compliance with the
production documents.

Begründung:

Reason:Die vorgenannten nichtelektrischen RoHAusführungen haben nach der Zündgefahrenbewertung, entsprechend DIN EN 13463-1, Absatz
5.2 auch bei selten auftretenden Betriebsstörungen keine eigene potenzielle Zündquelle und fallen
somit nicht unter die Richtlinie 2014/34/EU

According to the ignition risk assessment performed in accordance with DIN EN 13463-1, section 5.2, the non-electrical self-operated regulator
versions do not have their own potential ignition
source even in the rare incident of an operating
fault. As a result, they do not fall within the scopeof Directive 2014/34/EU.

Hinweis:

Note:

Diese Erklärung gilt für den Einsatz der genannten
Betriebsmittel nur in den Ausführungen ohneelektrische Komponenten für allgemeine technische Anwendungen innerhalb des Ex-Bereiches.

This declaration applies to the use of the mentioned device versions without electrical components only for general technical applicationsin hazardous areas.

Die Verwendung als Komponenten nach der Definition der Richtlinie 2014/34/EU wird ausdrücklichausgeschlossen.

The use as "components" as defined by Directive
2014/34/EU is explicitly prohibited.

Manufacturer's Declaration: V/HE-1233-1 DE-EN

Changed on: 2016-05-11

Changed by: E37/pg/V74/tny/V73/sid

SAMSON AKTIENGESELLSCHAFT · Weismuellerstrasse 3 · 60314 Frankfurt am Main, Germany · www.samson.de

EB 2185 EN

1

39

SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
samson@samsongroup.com · www.samsongroup.com

2024-08-28 · English

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