EB 2183 EN
Translation of original instructions

Type 2432/2430/2403 TR/STM

Type 2403 Safety Temperature Monitor (STM)
Self-operated Temperature Regulators

Edition July 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 2183 EN

Contents

1
1.1
1.2

Safety instructions and measures....................................................................4
Notes on possible personal injury....................................................................8
Notes on possible property damage.................................................................9

2
2.1
2.2
2.3

Markings on the device................................................................................10
Inscription....................................................................................................10
Location of the inscription..............................................................................10
Material identification number.......................................................................10

3
3.1
3.2

Design and principle of operation.................................................................11
Technical data..............................................................................................13
Process medium and scope of application.......................................................13

4
4.1
4.2
4.3
4.4

Measures for preparation.............................................................................19
Unpacking...................................................................................................19
Transporting and lifting.................................................................................19
Storage........................................................................................................19
Preparation for installation.............................................................................20

5
5.1
5.2
5.3
5.4
5.4.1
5.4.2
5.5
5.5.1
5.5.2

Mounting and start-up..................................................................................20
Mounting the safety temperature monitor onto the valve...................................20
Additional fittings..........................................................................................21
Combination with control thermostat...............................................................21
Installing the valve into the pipeline................................................................22
Installation conditions....................................................................................22
Installing the temperature sensor....................................................................22
Start-up........................................................................................................24
Gases and liquids.........................................................................................24
Vapors.........................................................................................................24

6
6.1
6.2

Operation....................................................................................................25
Adjusting the limit temperature.......................................................................25
Fine adjustment of the limit temperature..........................................................26

7
7.1

Servicing.....................................................................................................27
Preparation for return shipment......................................................................27

8

Malfunctions................................................................................................27

9
9.1
9.2
10
10.1
11

Decommissioning and removal.....................................................................28
Decommissioning..........................................................................................29
Disposal.......................................................................................................29
Appendix.....................................................................................................30
After-sales service and spare parts.................................................................30
Certificates...................................................................................................30

EB 2183 EN

Safety instructions and measures

1 Safety instructions and measures
Intended use
The Type 2403 Safety Temperature Monitor (STM) with valve is designed for temperaturemonitoring and control of the energy supply to heat generators (e.g. heat exchangers) byclosing the valve. The connection of an additional Type 2430 Control Thermostat converts thesafety temperature monitor (STM) into a temperature regulator with safety temperature monitor (TR/STM).
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 the device for its intended purpose or for damage caused by external forces or any other external
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.
Personal protective equipment
SAMSON recommends checking the hazards posed by the process medium being used (e.g.
u GESTIS (CLP) hazardous substances database).

4

EB 2183 EN

Safety instructions and measures

Î Provide protective equipment (e.g. safety gloves, eye protection) appropriate for the process medium used.
Î Wear hearing protection when working near the regulator. Follow the instructions givenby the plant operator.
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.
Hazards resulting from the special working conditions at the installation site of the device
must be identified in a risk assessment and prevented through the corresponding safety
instructions drawn up by the operator.
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.
These mounting and operating instructions deal with the standard version of the device.
Components of the device that differ to those used for the standard version described in thisdocument can be exchanged with other certain SAMSON components. The residual hazardsof these components are described in the associated mounting and operating instructions(see 'Referenced documents' chapter).
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.

EB 2183 EN

5

Safety instructions and measures

Operators are additionally responsible for ensuring that the limits for the product defined in
the technical data are observed. This also applies to the start-up and shutdown procedures.
Start-up and shutdown procedures fall within the scope of the operator's duties and, as such,are not part of these mounting and operating instructions. SAMSON is unable to make any
statements about these procedures since the operative details (e.g. differential pressures andtemperatures) vary in each individual case and are only known to the operator.
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.
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 11).
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).

6

EB 2183 EN

Safety instructions and measures

Referenced documents
The following documents apply in addition to these mounting and operating instructions:− Mounting and operating instructions fore.g.

Type 2430 Control Thermostat

u EB 2430

e.g.

Type 2403 Safety Temperature Monitor (STM)u EB 2183

e.g.

Type 2439 Safety Temperature Limiter (STL)u EB 2185

e.g.

Type 1 NI Straineru EB 1010

e.g.

Type 2 NI Straineru EB 1015

Plus all mounting and operating instructions of the components on which the Type 2403
Safety Temperature Monitor is mounted (e.g. valve).
− Data sheets fore.g.

Accessories: Double adapter · Manual adjuster · Intermediate
insulating pieceu T 2176e.g.

Typetested safety devices

u T 2181− Mounting and operating instructions as well as data sheets for additional fittings(e.g. shut-off valves, pressure gauges etc.).

EB 2183 EN

7

Safety instructions and measures

1.1 Notes on possible personal injury! WARNING
Risk of personal injury due to incorrect operation, use or installation as a result of
information on the safety temperature limiter being illegible.
Over time, markings, labels and nameplates on the device may become covered withdirt or become illegible in some other way. As a result, hazards may go unnoticed andthe necessary instructions not followed. There is a risk of personal injury.
Î Keep all relevant markings and inscriptions on the safety temperature limiter in aconstantly legible state.
Î Immediately renew damaged, missing or incorrect nameplates or labels.
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.
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 affected
u www.samsongroup.com/en/about-samson/environment-social-governance/material-compliance/.
Risk of fire or explosion as a result of hydrocarbons escaping due to leakage in theType 2430-3 Control Thermostat or Type 2403 Safety Temperature Monitor.
A small quantity of a flammable mixture of hydrocarbons is used as the operating medium in the Type 2430-3 Control Thermostat (vapor pressure principle) and theType 2403 Safety Temperature Monitor (STM).
Î Mount the safety temperature monitor in such a way that in the event any operating
medium escapes as a result of leakage, it cannot come into contact with hot surfaces, sparks, open flames or other ignition sources.

8

EB 2183 EN

Safety instructions and measures

1.2 Notes on possible property damage! NOTICE
Risk of irreparable damage to the safety temperature limiter 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 safety temperature limiter will be irreparably
damaged and will no longer be able to fulfill its control task.
Î Do not dismantle the safety temperature limiter.
Î Only perform allowed activities on the safety temperature limiter.
Î Contact SAMSON's After-sales Service before replacing spare parts.
Risk of leakage and valve damage due to over- or under-torquing.
Observe the specified torques when tightening valve components.
Excessive tightening torques lead to parts wearing out more quickly. Parts that are tooloose may cause leakage.
Î Observe the specified tightening torques.
Risk of damage to the safety temperature limiter due to the use of unsuitable tools.
Certain tools are required to work on the safety temperature limiter.
Î Only use tools approved by SAMSON.
When in doubt, consult SAMSON.
Risk of damage to the safety temperature limiter due to incorrectly attached slings.
Î Do not attach load-bearing slings to the safety temperature limiter.

EB 2183 EN

9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
1 Model number
1

2 Type designation

7

2
3

3 Material number/configuration ID
4 Temperature 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 2403

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. For more details on the inscription (see Fig. 1).

10

EB 2183 EN

Design and principle of operation

3 Design and principle ofoperation
The Type 2403 Safety Temperature Monitor(STM) with a valve operates without auxiliary energy and is designed for extended safety according to DIN EN 14597. The safety
temperature monitor is used to limit the temperature by closing a SAMSON Series 43
Valve connected to the safety thermostat.
The safety temperature monitor mainly consists of a valve and safety thermostat withcapillary tube (8) and bulb sensor (9).
The connection of an additional Type 2430
Control Thermostat (20) converts the safety
temperature monitor (7) into a temperature
regulator with safety temperature monitor(TR/STM). See Fig. 3.
The valve is closed by a spring mechanism
when the temperature reaches the adjusted
limit, when the capillary tube breaks orwhen leakage occurs in the sensor system.

The safety temperature monitor closes thevalve when the temperature reaches the adjusted temperature limit. If the monitored
temperature falls below the adjusted limit
temperature, the safety temperature monitor
opens the valve according to its proportional
component.
Fail-safe action
When the capillary tube ruptures or there isa leak in the sensor, the spring mechanism
reacts to the reduced system pressure andthe pin of the operating element (11) closes
the valve. The valve cannot be reset. In thiscase, the Type 2403 Safety Temperature
Monitor must be replaced.
Note
The adjusted limit temperature must have aminimum temperature difference of 15 K to
the set point of the temperature regulator.

The safety temperature monitor works
according to the vapor pressure principle.
The temperature of the medium creates apressure in the temperature sensor (9) which
is proportional to the measured temperature.
This pressure is transferred through thecapillary tube (8) to the operating bellows(10) and converted into a positioning force.
The force is transferred over the pin (11) of
the operating element to the plug stem (4)and plug (3). The position of the plug
determines the flow rate of the heat transfer
medium across the area released between
the seat (2) and plug.

EB 2183 EN

11

Design and principle of operation

1

Note
Tightening torque for couplingnut (6): 20 Nm

2
3
9

10

4
5
6
11

7

13

12

8
14
6

20

1
2
3
4
5
6

Valve body
Seat
Plug
Plug stem
Valve spring
Coupling nut
Type 2403 Safety Temperature Monitor
7(STM)

8 Capillary tube
9 Temperature sensor
10 Operating element
11 Pin of operating element
12 Limit adjustment knob
13 Lead-seal hole
Mounting location for Type 2430 Control
14
Thermostat
20 Type 2430 Control Thermostat (optional)

Fig. 3: Design and principle of operation (TR/STM)

12

EB 2183 EN

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.
For limit signals from 60 to 120 °C · Valves
G ½ to G 1 · DN 15 to 50 · Pressure rating
PN 16 or 25 · Max. 200 °C
The Type 2403 Safety Temperature Monitor(STM) with a valve operates without auxiliary energy and is designed for extended safety according to DIN EN 14597. The valve isclosed by a spring mechanism when the temperature reaches the adjusted limit, when thecapillary tube breaks or when leakage occurs in the sensor system. The devices areautomatically reset and put back into operation after the temperature has fallen below
the limit and the fault has been remedied.

Note
Further details and technical data of thevalves and control thermostats are listed in
the following mounting and operating instructions:− Mounting and operating instructions forvalves, e.g. u EB 2171, u EB 2172 andand u EB 2173
− Mounting and operating instructions forthe control thermostats, e.g. u EB 2430
and u EB 2430-3− Mounting and operating instructions forthe safety temperature limiter, e.g.
u EB 2185
Dimensions and weights
Table 2 and Table 3 provide an overview ofthe dimensions and weights. The lengths andheights are shown in the dimensional drawings (Fig. 4 to Fig. 6).
Typetesting
The safety temperature monitor is tested by
the German technical surveillance association TÜV according to DIN EN 14597 under
the type designation 2750-5. The registration number is available on request.

EB 2183 EN

13

Design and principle of operation

Table 1: Technical data · All pressures (gauge)
Type 2403 Safety Temperature Monitor
Port

M32x1.5

Adjustment range of limit value

60 to 75 °C · 75 to 100 °C

Permissible ambient temperature

Max. 50 °C

Perm. temperature at the sensor

25 K above the adjusted limit

Perm. pressure at sensor

25 barCapillary tube length

5m

Conformity

Table 2: Dimensions in mm
Table 2.1 Type 2432/2403 · Type 2433/2403 · Type 2436/2403 · Type 2437/2403
Nominal size
Pipe Ød

DN

15

20

25

32

40

50

d

21.3

26.8

32.7

42

48

60

30

36

46

59

65

82

AF
Length

L

65

70

75

100

110

130

With welding ends

L1

210

234

244

268

294

330

With threaded ends

L2

129

144

159

180

196

228

With flanges

L3

130

150

160

180

200

230

Male thread

A

G½

G¾

G1

G 1¼

G 1½

G2

Type 2432/2403

H

140

190

H1

30

55

H
Type 2433/2403

Type 2436/2403

Type 2437/2403

14

135

145

H2

112

122

124

144

157

165

H3

72

77

82

100

108

114

H4

72

80

82

105

110

115

H

–

160

H1

–

95

H

220

270

H1

30

55

EB 2183 EN

Design and principle of operation

Table 2.2 Type 2431/2403 · Type 2433/2403 · Type 2435/2403 · Type 2436/2403
Connection size

G½

G¾

G1

65

75

90

Face-to-face dimensions

L

Type 2431/2403

H

140

H

140

Type 2433/2403
Type 2435/2403
Type 2436/2403

H1

40

H

220

H

145

H1

46

Table 3: Weights in kg
Table 3.1 Type 2432/2403 · Type 2433/2403 · Type 2436/2403 · Type 2437/2403
Nominal size

Type 2432/2403

Type 2433/2403

kg (approx.)kg (approx.)

DN

15

20

25

32

40

50

With welding ends

2.5

2.8

3.1

5.1

5.8

7.6

With threaded ends

2.4

2.7

3.0

5.0

5.7

7.5

With flanges

3.9

4.8

5.6

8.3

9.8

11.6

With welding ends

2.9

3.2

3.4

4.8

5.1

6.4

With threaded ends

2.9

3.2

3.4

4.8

5.1

6.4

With flanges

5.0

6.2

7.1

9.6

11

14

3.8

4.2

4.6

3.8

4.2

4.6

With welding ends
Type 2436/2403

kg (approx.)

With threaded ends–

With flanges

Type 2437/2403

kg (approx.)

7.0

8.2

9.6

With welding ends

2.7

3.0

3.3

5.5

6.2

8.1

With threaded ends

2.6

2.9

3.2

5.5

6.2

8.1

With flanges

4.1

5.0

5.8

8.5

10

12

Table 3.2 Type 2431/2403 · Type 2433/2403 · Type 2435/2403 · Type 2436/2403
Connection size

G½

G¾

G1

Type 2431/2403

kg (approx.)

2.0

2.1

2.2

Type 2433/2403

kg (approx.)

2.2

2.3

2.4

Type 2435/2403

kg (approx.)

2.5

2.6

2.7

Type 2436/2403

kg (approx.)

2.4

2.5

2.6

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15

Design and principle of operation

Dimensional drawings of safety temperature monitors (STM)

L

H

H

30

H1

L

Type 2431/2403 · Type 2435/2403

Type 2433/2403 · Version with female thread

L1
L

Type 2432/2403 · Type 2436/2403

H2
SW
H

H

SW

d

H1

d

L1
L

Type 2433/2403 · Version with welding ends

Fig. 4: Dimensional drawings

16

EB 2183 EN

Design and principle of operation

Dimensional drawings of safety temperature monitors (STM)

L2
L

H

SW

Type 2436/2403 · G ½ to 1

Type 2433/2403
Version with threaded ends

L1
L

H4

SW
H1

d

H

A

50

H3

L

SW

G½

170

255

225

H

L
L3

Ø12

Type 2433/2403 · Version with flanges
Fig. 5: Dimensional drawings

EB 2183 EN

17

Design and principle of operation

Dimensional drawings of temperature regulator with safety temperature monitor (TR/STM)
255
M32 x 1.5

90

SW 36

125

M32 x 1.5
170
SW 22

SW 17

250

G½

Ø12

Type 243 …/2430/2403
Fig. 6: Dimensional drawings

18

EB 2183 EN

Measures for preparation

4 Measures for preparation

4.2 Transporting and lifting

After receiving the shipment, proceed as follows:

Due to the low service weight, lifting equipment is not required to lift and transport thesafety temperature monitor (e.g. to mount it
onto the valve).

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 install the device:
1. Remove the packaging from the device.
2. Dispose of the packaging in accordancewith the valid regulations.

Transport instructions− Protect the device against external influences (e.g. impact).
− Do not damage the corrosion protection(paint, surface coatings). Repair any
damage immediately.
− Protect the device against moisture anddirt.
− Observe the permissible ambient temperatures (see Chapter 3.1).

4.3 Storage! NOTICE
Risk of safety temperature monitor damage
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.

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19

Mounting and start-up

Storage instructions− Protect the safety temperature monitor
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 3.1).
− Do not place any objects on the device.
Tip
Our after-sales service can provide moredetailed storage instructions on request.

4.4 Preparation for installation
Proceed as follows:Î Check to ensure that the connection forthe safety temperature monitor at thevalve is clean.
Î Check the safety temperature monitor fordamage.

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 monitor in the insulation of the pipeline.

5.1 Mounting the safety temperature monitor onto thevalve
The safety temperature monitor is always installed in the plant in combination with avalve. The Type 2403 Safety Temperature
Monitor can be attached to the valve bodyeither before or after the valve is installed in
the pipeline.
Î Connect the safety temperature monitor(7) to the valve body (1) by tightening
the coupling nut (6) with 20 Nm.
Note
The Type 2403 is installed without
thermowell.

Î Check to make sure that the type designation, pressure rating and temperature
range of the safety temperature monitor
match the plant conditions (nominal sizeand pressure rating of the pipeline, medium temperature etc.).
Î Check any mounted thermometers tomake sure they function.

20

EB 2183 EN

Mounting and start-up

5.2 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 thedrain plug facing upward.
Tip
Remember to leave enough space to remove
the filter element for cleaning.

EB 2183 EN

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 downstream of thetemperature sensor to monitor the temperatures prevailing in the plant (see Fig. 9).

5.3 Combination with control
thermostat
An additional Type 2430 Control Thermostat
is mounted in the TR/STM version.
Note
If the limit temperature has not yet been adjusted, adjust it before mounting the control
thermostat (see Chapter 6.1).
Î Connect the Type 2430 Control Thermostat to the safety temperature monitor (7)by tightening the coupling nut (6) with
20 Nm.

21

Mounting and start-up

5.4 Installing the valve into thepipeline− Install the regulator free of stress andwith the least amount of vibrations as
possible.

5.4.1− Observe the permissible ambient temperature of max. 50 °C.

Installation conditions− Choose a place of installation that allows
you to freely access the regulator evenafter the entire plant has been completed.
− Make sure the direction of flow matches
the direction indicated by the arrow on
the body.

5.4.2

Installing the temperature sensor

Mounting orientation
The mounting position of the temperature
sensor depends on the sensor version:

ca.
10 mm

Marking bead

max.
60 mm

Screw glandFig. 8: Process medium flowing over thesensorFig. 7: Sensor with marking bead

1

2

3

1

4 56

1

Shut-off valve

2

Strainer3

Temperature regulator

4

Thermometer5

Temperature sensor (TR)6

Temperature sensor (STM)

Fig. 9: Installation example · TR/STM on a water-heated boiler

22

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Mounting and start-up

Sensor in horizontal position or with sensor
tip pointing up · Marked by an embossed'o' on the screw gland.

Î Make sure that almost all of the process
medium being monitored flows aroundthe sensor (of Type 2403). See Fig. 8.

To help align the sensor in the horizontal position, a marking bead (see Fig. 7) is locatedon the sensor. This marking must face upward.

Î Select the site of installation where overheating or considerable idling times cannot occur.

Sensor in horizontal position or with sensor
tip pointing down · Marked by an embossed'u' on the screw gland.
To help align the sensor in the horizontal position, a marking bead (see Fig. 10) is located on the sensor. This marking must face upward.

Capillary tube
Î Carefully run the capillary tube (8) without bending or twisting it. Make sure thatthe capillary tube is not damaged.
! NOTICEÎ Weld a welding socket with G ½ female
thread at the place of installation.

Risk of capillary tube damage due to incorrect handling.
− Do not shorten the capillary tube.
− Roll up excess tube to form a ring. The
smallest bending radius is 50 mm.

'o' marking'u' marking

The screw gland seals off the sensor.

U'u' marking

Marking beadMarking beadO'o' marking
Tip of sensor in horizontal position or pointing
up, with intermediate positions

Tip of sensor in horizontal position or pointing
down, with intermediate positions

Fig. 10: Installing the temperature sensor (vapor pressure principle)

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Mounting and start-up− Observe the permissible ambient temperature of max. 50 °C over the entire
length of the capillary tube.

5.5 Start-up
Fill the plant very slowly with the process medium on 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.
! NOTICE
Malfunction and damage due to adverse
weather conditions (temperature, humidity).
Do not install the safety temperature monitor
outdoors or in rooms prone to frost. If such alocation cannot be avoided, protect the regulator 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 the residual 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 monitor ismounted onto the valve, it can be put into
operation.

5.5.1

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

5.5.2

VaporsÎ 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.

24

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Operation

6 Operation

4. Mount the Type 2430 Control Thermostat
onto the valve (see Chapter 5.3).

See Fig. 3.

The limit temperature is continuously adjustable.

6.1 Adjusting the limit temperature
1. If necessary, unscrew the Type 2430
Control Thermostat.
2. Set the target limit temperature by turning the black adjustment knob (12, seeFig. 3) according to the scale (see Table 4).
Turn the adjustment knob clockwise ()to reduce the limit temperature.
Turn the adjustment knob counterclockwise () to increase the limit temperature.
3. Pull the wire through the lead-seal hole(13) and lead-seal it to fix the adjusted
limit.

The limit can be changed roughly by turning
the adjuster according to the specifications(limit change per turn). After reaching thelimit temperature, the Type 2403 Safety Temperature Monitor must close the valve completely (leakage rate 0.05 % of the KVS coefficient).
Note
When the Type 2403 Safety Temperature
Monitor is combined with a Type 2430 Control Thermostat, make sure that there is aminimum difference of approximately +15 K
between the adjusted limit temperature of thesafety temperature monitor and the set pointtemperature of the control thermostat.

Table 4: Rough limit adjustment 1)
Limit range
01

2

60 to 75 °C

60 °C

75 °C

75 to 100 °C

75 °C

1)

Limit change per turn(approx.)

Scale intervals
34

2.6 °C
100 °C

2.2 °C

Precise adjustment is only possible using a thermometer (see ‘Fine adjustment of the limit
temperature’).

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Operation

6.2 Fine adjustment of the limit
temperature! DANGER
Risk of bursting in pressure equipment.
Valves and pipelines are pressure equipment. Improper opening can lead to valve
components bursting.
− 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.
! 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.
− If possible, drain the process medium fromthe plant sections affected and from thevalve.
− Wear protective clothing, safety gloves andeye protection.
! 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.

26− Allow components and pipelines to cool
down or warm up to the ambient temperature.
− Wear protective clothing and safety gloves.
In case you want to make fine adjustments tothe safety temperature monitor or the limit
value deviates, proceed as follows:
Fine adjustment using a thermometer installed in the plant
1. Adjust the limit temperature of the safety
temperature monitor to approx. 10 K below the required limit (see Chapter 6.1).
2. When a control thermostat is mounted
on the safety temperature monitor, adjust
the limit temperature to approx. 10 °C
above the limit temperature.
3. Read the resulting temperature at thethermometer installed in the plant (after
approx. 5 min.).
4. When the limit temperature is still too
low:
slowly turn the rotary knob (12) at thesafety temperature monitor clockwise toincrease the limit until the temperature at
the thermometer reaches and remains at
the limit temperature.
After the temperature reaches the limit
temperature:
turn the rotary knob clockwise (P) one
more turn.
5. When a control thermostat is mounted,
readjust it to the required set point.

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Servicing

7 Servicing

8 Malfunctions

The safety temperature monitor does not require much maintenance. Nevertheless, it issubject to natural wear, particularly at thesoldered joints.

The malfunctions listed in Table 5 are causedby mechanical faults and incorrect regulator
sizing. In the simplest case, the functioning
can be restored following the recommended
action. Special tools may be required for repair work.

Note
The device was checked by SAMSON before
it left the factory.
− The product warranty becomes void ifservice or repair work not described inthese instructions is performed without
prior agreement by SAMSON's After-sales
Service.
− Only use original spare parts by
SAMSON, which comply with the original
specifications.

7.1 Preparation for return shipment
Defective devices can be returned to
SAMSON for repair. Proceed as follows toreturn devices to SAMSON:

Depending on the operating conditions,check the valve at certain intervals to preventa possible failure before it can occur. Plant
operators are responsible for drawing up an
inspection and test plan.
Note
Contact SAMSON's After-sales Service for
malfunctions not listed in the table.
Tip
SAMSON's After-sales Service can support
you in drawing up an inspection and test
plan for your plant.

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 atu www.samsongroup.com > SERVICE &SUPPORT > After-sales Service.
4. Continue as described on our website atu www.samsongroup.com > Service >After-sales Service > Returning goods.
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Decommissioning and removal

Table 5: Troubleshooting
Malfunction

Possible reasons

Recommended action

The temperature adjusted at thecontrol thermostat reaches theadjusted temperature limit.

Control thermostat defectiveÎ Replace the control thermostat.

Foreign particles blocking the valve
plugÎ Remove foreign particles.
Î Replace damaged parts.

Valve trim is worn out.

Î Replace damaged parts.

Foreign particles blocking the valve
plugÎ Remove foreign particles.
Î Replace damaged parts.

Valve trim, particularly with soft seat,is worn.

Î Replace damaged parts.

STM is defective and has moved to
the fail-safe position.

Î Replace the STM.

Temperature sensor not correctly
installed.

Î Check installation. Observe notes
on installation (see Chapter 5.4).

Strainer blockedÎ Clean the strainer.

Temperature exceeds the adjusted
limit.

Increased flow through closed valve(seat leakage).

Heat supply has been interrupted.

9 Decommissioning andremoval! DANGER
Risk of bursting in pressure equipment.
Valves and pipelines are pressure equipment. Improper opening can lead to valve
components bursting.
− 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.

28! 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.
− If possible, drain the process medium fromthe plant sections affected and from thevalve.
− Wear protective clothing, safety gloves andeye protection.

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Decommissioning and removal! 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.

9.1 Decommissioning
To decommission the safety temperaturemonitor 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. Shut off or disconnect the control line, if installed.
5. If necessary, allow the pipeline and device to cool down or warm up to the ambient temperature.

9.2 Disposal
SAMSON is a producer
registered at the following
European institution
u https://www.ewrn.org/
national-registers/nationalregisters.
WEEE reg. no.:DE 62194439/FR 025665

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 as part of a distributor take-backscheme.

6. Remove the sensor from the pipeline
and, if necessary, seal the opening.
7. Remove the safety temperature monitor
from the valve.

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Appendix

10 Appendix
10.1 After-sales service andspare parts

Spare parts
There are no spare parts available for thesafety temperature monitor.

After-sales service
Contact SAMSON's After-sales Service forsupport concerning service or repair work or
when malfunctions or defects arise.
E-mail
You can reach our after-sales service ataftersalesservice@samsongroup.com.

11 Certificates

Addresses of SAMSON AG and its subsidiaries

The EU declarations of conformity are included on the next pages.

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.
Required specifications
Please submit the following details:− Order number and position number inthe order− Type and nominal size (valve)− Material number (Type 2403 STM)
− Material number (Type 2430 TR)− Limit range− Temperature and process medium− Is a strainer installed?
− Installation drawing showing the exact
location of the regulator and all the additionally installed components(Type 2430 Control Thermostat, shut-off
valves, pressure gauge etc.)30

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Appendix

Module D, No. / N° CE-0062-PED-D-SAM 001-22-DEU
For the following products, SAMSON hereby declares under its sole responsibility:
Safety Temperature Monitor STM 2403 (2750-5)
combined with valves
2431, 2432, 2433, 2435, 2436, 2437, 2479, 2488 (2710, 2720, 2730)
the conformity with the following requirement.
Directive of the European Parliament and of the Council
on the harmonization 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

EC Type Examination Certificate

Module B

Certificate no.
01 202 969/B-22-0014-01

Conformity assessment procedure applied

Module D

Certificate no.
CE-0062-PED-D-SAM-001-22-DEU

The design is based on the procedures specified in the following standards:
DIN EN 12516-2, DIN EN 12516-3 or ASME B16.1, ASME B16.24, ASME B16.42
The manufacturer’s quality management system is monitored by the following notified body:
Bureau Veritas Services SAS, 8 Cours du Triangle, 92800 PUTEAUX – LA DEFENSE, France
Manufacturer: SAMSON AG, Weismüllerstraße 3, 60314 Frankfurt am Main, Germany

Frankfurt am Main, 01. December 2022

Norbert Tollas
Senior Vice President
Global OperationsPeter Scheermesser
Director
Product Maintenance & Engineered Products
Revision 05

Classification: Public · SAMSON AKTIENGESELLSCHAFT · Weismuellerstrasse 3 · 60314 Frankfurt am Main, Germany

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31

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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