T 2181 EN
Typetested safety devices
Series 43 Self-operated Temperature Regulators

Application
Control, limitation, safety monitoring and safety limitation of the energy supplied to heat generators or heat exchangers whichmust be equipped with typetested devices.
Note
Devices tested according to DIN EN 14597 are available for installations according to DIN 4747-1, DIN EN 12828 and DIN 4753.

The safety devices are used to control and protect indirectly
heated heat generators in heating and service water heating
installations. The temperature regulators, temperature limiters,
safety temperature monitors and safety temperature limiters
are compulsory according to the relevant regulations (e.g.
DIN 4747-1, DIN EN 12828 and DIN 4753) for installations
with heat generators or heat exchangers which are heated bysteam, hot fluids or by district heating systems. These devices
must be tested for reliability and certified accordingly. Therefore, the devices listed in this Information Sheet have beentested by TÜV (German technical surveillance association)
and approved with a register number.
Device designations
The designation of safety devices is stipulated in
DIN EN 14597 (temperature control devices and temperature
limiters for heat generating systems). The temperatures specified in Fig. 1 to Fig. 3 are intended only as a guide to the typical fields of application of the devices shown. The devices
needed in each case must meet the requirements of the installation and comply with the relevant safety regulations.

STL <95˚C>110˚CSTL
TR_<100˚C

Fig. 1: DHW heating according to DIN 4753

STM
>120˚C

Fig. 2: Heating system with safety temperature monitor according
to DIN 4747-1

Temperature regulators (TR), which are tested according to
DIN EN 14597, are necessary in many installations. They
constantly measure the temperature as a controlled variable,compare it with a given set point, correct the actual temperature according to the set point and interrupt the energy supply
when the temperature exceeds the set point.
Safety temperature monitors (STM) interrupt the energy supply when the temperature reaches the adjusted limit, when thecapillary tube ruptures or when there is a leak in the sensor(Fig. 3). They reset themselves automatically when the temperature has fallen below the limit and the fault has been remedied.

<120˚C

STM<_ 75˚CTR>100˚C

Fig. 3: DHW heating with temperature regulator and safety
temperature monitor according to DIN 4747-1
TR
STM
STL

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

Temperature regulator
Safety temperature monitor
Safety temperature limiter

Edition June 2018

Safety temperature limiters (STL) interrupt and block the energy supply when the temperature reaches the adjusted limit,
when the capillary tube ruptures or when there is a leak in thesensor (Fig. 1). They can only be reset and put back into operation with a tool when the temperature has fallen below thelimit and the fault has been remedied.
Safety temperature monitors (STM) and safety temperature
limiters (STL) are designed for extended safety according to
DIN EN 14597 since they are also effective even when a device fails. The safety temperature limiter can be delivered with
an electric signal transmitter which produces a signal for fault
indication.

Table 1: Dynamic behavior of control thermostats (inseconds)
Principle

Type
2430

Adsorption
Vapor
pressure
1)

Without
15 s 1)

Thermowell

30 s 2)With

40 s 1)80 s 2)

2439

–

3)

40 s

2403

3s

– 3)

DN 15 to 25

2)

DN 32 to 50

3)

Not permissible

Table 2: Overview of Series 43 Temperature Regulators
Dynamic behavior of control thermostats
The dynamics of the regulator are mainly determined by the
response of the sensor with its characteristic time constant.
Table 1 lists the response times of SAMSON control thermostats for Series 43 Regulators operating according to different
principles measured in water.
Tested safety equipment
Versions for G ½ to G 1 · DN 15 to 50 · PN 16 or PN 25
Limits up to 120 °C
The temperature sensors of the regulators and limiters function
according to the vapor pressure principle or the adsorption
principle.
The temperature-dependent pressure change in the sensor
causes the valve plug position to change, thus changing theflow rate of the heating medium.
Table 2 shows an overview of Series 43 Regulators.

Type

43-1

2431

43-2

2432

43-3

2433 1)43-52435 1)Connection size

43-6

2436

Pressure
ratingRefer to Data
Sheet ...

G ½ to G 1 1) 3)
DN 15 to 50 1) 2)

u T 2171

DN 15 · 25 4)
G ½ to G 1

u T 2173

DN 15 to 50
G ½ to G 1
G ½ to G 1

PN 25
1) 3)

DN 32 to 50 1)

u T 2172

DN 15 to 50 2)
DN 15 · 25 4)

43-7

2437

DN 15 to 50 1) 2)

43-8

2432

DN 15 1)

PN 16

Double adapter/manual adjuster/intermediate
insulating piece
1)
2)
3)

Regulators tested according to DIN EN 14597

With valve

Type ...
Regulator

4)

u T 2178
u T 2176

Material CC499K
Flanged valve body of EN-GJS-400-18-LT
Material 1.4408
Flanged valve body of 1.4408

The following versions are available:–– Temperature regulator (TR) with Type 2430 Control Thermostat–– Type 2403 Safety Temperature Monitor (STM)–– Type 2439 Safety Temperature Limiter (STL)
The register number is available on request.
For more details refer to Data Sheet u T 2185.

Legend for Fig. 4 to Fig. 8
1 Type 2431, Type 2435 and Type 2436 Globe Valve with female thread
2 Type 2432, Type 2436 and Type 2437 Globe Valve with male thread
3 Type 2432, Type 2436 and Type 2437 Globe Valve with flanged body
4 Type 2433 Three-way Valve with female thread/male thread
5 Type 2430 Control Thermostat
6 Type 2403 Safety Temperature Monitor (STM)
7 Type 2439 Safety Temperature Limiter (STL)
8 Type 2438 Hydraulic Controller
9 Electric signal transmitter (optional)

2

T 2181 EN

Valves with TR
1

Valves with STM
2

TR

TR

2

1

6

6

5

5

STW
STM

STW
STM
Type 2431 Valve with Type 2430
Control Thermostat (Type 43-1) orType 2436 Valve with Type 2430
Control Thermostat (Type 43-6)

Type 2432 Valve with Type 2430
Control Thermostat (Type 43-2) orType 2436 Valve with Type 2430
Control Thermostat (Type 43-6)

Type 2431 or Type 2436 Valve withType 2403 STM

3

4
6

6

3

TR

Type 2432 or Type 2436 Valve withType 2403 STM

4

4

STM
STW

STW
STM
5

5

5

TR

TR
Type 2432 Valve with Type 2430
Control Thermostat (Type 43-2) orType 2436 Valve with Type 2430
Control Thermostat (Type 43-6)

Type 2433 Valve with Type 2430
Control Thermostat (Type 43-3)

Type 2432 or Type 2436 Valves(flanged) with Type 2403 STM

1
4
6
6

2

1

STW
STM
STW
STM

TR

TR

Type 2433 Valve with Type 2403
STM

5

5

Type 2435 Valve with Type 2430
Control Thermostat (Type 43-5)

6

6

2
8

TR

Type 2435 Valve with Type 2403
STM

3

2

Type 2437 Valve with Type 2430
Control Thermostat (Type 43-7)

3

STW
STM
TR

5

STM
STW

Type 2437 Valve with Type 2403 STM

Fig. 5: Safety temperature regulators (STM) with Type 2403 Safety
Temperature Monitor

5Type 2437 Valve with Type 2430
Control Thermostat (Type 43-7)

Type 2433 Valve with Type 2403
STM

Type 2432 Valve with Type 2430
Control Thermostat and Type 2438
Hydraulic Controller (Type 43-8)

Fig. 4: Temperature regulators (TR) with Type 2430 Control
Thermostat

Safety temperature regulators (STM) · See Fig. 5
The safety temperature regulator (STM) consist of a Type 2403
Safety Temperature Monitor (6) and a valve (1 to 4).
Temperature regulators (TR) · See Fig. 4
Temperature regulators (TR) consist of a Type 2430 Control
Thermostat (5) and a valve (1 to 4).
They control the temperature and regulate the energy supply
when the temperature exceeds the adjusted set point.

T 2181 EN

The safety temperature monitor closes the valve when thetemperature reaches its limit (adjustable between 60 to 75 °C,
75 to 100 °C or 100 to 120 °C) as well as when the capillary
tube ruptures or when there is a leak in the sensor. It resets
itself automatically when the fault has been remedied and thetemperature has fallen below the limit.

3

Valves with STL

Valves with TR/STM
1

6

6

2

5

TR

STL
STB

1

STLSTB

7

2
7

5
STW
STM

Type 2431/Type 2403/Type 2430
or Type 2436/Type 2403/
Type 2430

TR

STW
STM

Type 2432/Type 2403/Type 2430
or Type 2436/Type 2403/
Type 2430

346Type 2431 or Type 2436 Valve withType 2439 STL

3STLSTB

6

Type 2432 or Type 2436 Valve withType 2439 STL

STL
STB

7

4
7

5
5

TR

STW
STM

TR

Type 2432/Type 2403/Type 2430
or Type 2436/Type 2403/
Type 2430

STW
STM

Type 2433/Type 2403/Type 2430

Type 2432 or Type 2436 Valve withType 2439 STL

Type 2433 Valve with Type 2439 STL

1
1

STLSTB

44
7

STLSTB

6

7

6

5
5

STM
STW

TR

TR

STW
STM
Type 2433 Valve with Type 2439 STL

Type 2433/Type 2403/Type 2430

2Type 2435/Type 2403/Type 2430

Type 2435 Valve with Type 2439 STL

32

3
STLSTB

67

STLSTB

7

6
5
5
TR

STM
STW
TR

STW
STM
Type 2437 Valve with Type 2439 STL

Type 2437/Type 2403/Type 2430

Fig. 6: Temperature regulators and safety temperature regulators(TR/STM) with Type 2403 Safety Temperature Monitor andType 2430 Control Thermostat

4

Fig. 7: Safety temperature regulators (STL) with Type 2439 Safety
Temperature Limiter (STL)

T 2181 EN

Temperature regulator and safety temperature
regulator (TR/STM) · See Fig. 6

Valves with TR/STL
STB
STL

1

STL
STB

7

The combined TR/STM consists of a Type 2403 Safety Temperature Monitor (6) as well as a Type 2430 Control Thermostat (5) and a valve (1 to 4).

2
7

5

5
TR

Type 2431/Type 2439/Type 2430
or Type 2436/Type 2439/
Type 2430

3

STLSTBThe Type 2430 Control Thermostat (5) additionally mounted at
the spring mechanism of the STM acts as a temperature regulator in this case.
TR

Type 2432/Type 2439/Type 2430
or Type 2436/Type 2439/
Type 2430

STL
STB

7

7

The limiters can only be unlocked and put back into operation
with a screwdriver after the temperature has fallen below thelimit and the fault has been remedied.

5
TR

TR
Type 2432/Type 2439/Type 2430
or Type 2436/Type 2439/
Type 2430

Type 2433/Type 2439/Type 2430

1
STLSTB

STL
STB

Temperature regulator and safety temperature regulator(TR/STL) · See Fig. 8
The combined TR/STL consists of a Type 2439 Safety Temperature Limiter (7) as well as a Type 2430 Control Thermostat (5) and a valve (1 to 4).
The Type 2430 Control Thermostat mounted at the Type 2439
Safety Temperature Limiter acts as a temperature regulator(TR) in this case.

4
7

The safety temperature regulator (STL) consists of a Type 2439
Safety Temperature Limiter (7) and a valve (1 to 4).
The spring mechanism in the safety temperature limiter closes
and locks the valve when the temperature reaches its limit (adjustable between 40 to 95 °C or 70 to 120 °C), when thecapillary tube ruptures or when there is a leak in the sensor.

4

5

Safety temperature regulator (STL) · See Fig. 7

7Electric signal transmitter (see Fig. 9)
The Type 2439 Safety Temperature Limiter can be delivered
with an electric signal transmitter for remote transmission of amalfunction.

5
5

TR

TR
Type 2433/Type 2439/Type 2430

Type 2435/Type 2439/Type 2430

3

2

STL
STB

7

STB
STL

7

5
5

10A,
250V AC,
IP 67

5
TR

TR

Cable:
9 LiYY 3x1.0/103 gray (BK, BN, BU)
3 m long, with wire end ferruleType 2437/Type 2439/Type 2430

Fig. 8: Temperature regulators and safety temperature regulators(TR/STL) with Type 2439 Safety Temperature Limiter andType 2430 Control Thermostat

T 2181 EN

Fig. 9: Type 2439 Safety Temperature Limiter with electric signaltransmitter (optional, not retrofittable)5T 2181 EN

2019-07-12 · English

Specifications subject to change without notice