Samson STM 5343, STL 5347, TR 5344, STL 5345, TR 5347 Mounting And Operating Instructions

Thermostats

Safety Temperature Monitor (STM) Type 5343
Temperature Regulator (TR) Type 5344
Safety Temperature Limiter (STL) Type 5345

Double Thermostat TR/STL Type 5347
Double Thermostat TR/STM Type 5348
Double Thermostat STM/STL Type 5349

Type 5343 Safety Temperature

Monitor (STM)

Type 5347

Double Thermostat TR/STL

Type 5344

Temperature Regulator (TR)

Type 5348

Double Thermostat TR/STM

Type 5345 Safety Temperature

Double Thermostat STM/STL

Mounting and
Operating Instructions

EB 5206 EN

Edition January 2009

Limiter (STL)

Type 5349

Contents

Contents Page

1 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 3

2 Design and principle of operation . . . . . . . . . . . . . . . . . . . 4

2.1 Typetesting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.3 Mounting accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2 Contact thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3 Thermowell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3.1 Wall mounting with thermowell in a different location. . . . . . . . . . 10

3.3.2 Mounting on tanks or in pipes . . . . . . . . . . . . . . . . . . . . . 10

4 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1 Temperature regulator (TR) . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Safety temperature monitor (STM) . . . . . . . . . . . . . . . . . . . 13

5.3 Safety temperature limiter (STL) . . . . . . . . . . . . . . . . . . . . 13

6 Lead sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Dimensions in mm . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Definitions of the signal words used in these instructions

DANGER!

DANGER indicates a hazardous situation
which, if not avoided, will result in death or

NOTICE

NOTICE indicates a property damage
message.

serious injury.

Note: Supplementary explanations, infor
mation and tips

2 EB 5206 EN

-

1 General safety instructions

General safety instructions

For your own safety, follow these instructions concerning the mounting, start-up and opera
tion of the thermostat:

The thermostat may only be mounted, started up or operated by trained and experienced

4

personnel familiar with the product.
According to these Mounting and Operating Instructions, trained personnel refers to
individuals who are able to judge the work they are assigned to and recognize possible
dangers due to their specialized training, their knowledge and experience as well as their
knowledge of the relevant standards.

On wiring and connecting the thermostat, you are required to observe the VDE

4

regulations and the regulations of the local power suppliers. Therefore, this type of work
must only be performed by trained personnel.

To avoid damage to any equipment, the following also applies:

Proper shipping and appropriate storage are assumed.

4

-

Note: The device with a CE marking fulfills the requirements of the Directives 2004/108/EC
and 2006/95/EC (EMC).
The Declaration of Conformity is available on request.

EB 5206 EN 3

Design and principle of operation

2 Design and principle of

operation

Safety temperature monitors (STM)

The snap-action switch is triggered if the
temperature at the bulb rises above the ad
justed set point. When the temperature falls
below the set point by approximately 8 K,
the switch returns to its original position.

The electric circuit is opened when the tem
perature at the bulb falls below –20 °C. The
circuit is automatically closed again when
the temperature at the bulb rises above
–20 °C.

The circuit remains permanently open if the
measuring system is broken.

Temperature regulators (TR)

The snap-action switch is triggered if the
temperature at the bulb rises above the ad­justed set point. When the temperature falls
below the set point by approximately 4 K,
the switch returns to its original position.

-

-

The circuit remains permanently open if the
measuring system is broken. It is not possi
ble to unlock the device.

-

2.1 Typetesting

The thermostats are typetested by the Ger
man Technical Inspectorate (TÜV) according
to DIN EN 14597.

Type DIN register number

5343 STW120908
5344 TR120808
5345 STB120708

-

Safety temperature limiters (STL)

The snap-action switch is triggered and
locked if the temperature at the bulb rises
above the adjusted set point. When the tem
perature falls below the set point by approx
imately 10 %, the snap-action switch can be
unlocked manually.

The electric circuit is opened when the tem
perature at the bulb falls below –20 °C. The
circuit is automatically closed again when
the temperature at the bulb rises above
–20 °C.

4 EB 5206 EN

-

-

-

Design and principle of operation

2.2 Technical data

Single thermostats: Type 5343 (STM), Type 5344 (TR), Type 5345 (STL)
Double thermostats: Type 5347 (TR/STL), Type 5348 (TR/STM), Type 5349 (STM/STL)

Permissible ambient temperature

Transportation and storage –30 to +50 °C
Service Max. +80 °C
Max. pipe temperature when

mounted as a contact thermostat
Degree of protection IP 54 according to EN 60529
Cable entry M20 x 1.5 cable gland,

Minimum switching capacity AC/DC = 24 V, 100 mA
Maximum switching capacity

Temperature regulator (TR),

Safety temperature monitor (STM)

Safety temperature limiter (STL)

Influence of mean ambient
temperature based on the set point

Connection Spring-clamp terminals, 0.75 to 2.5 mm² wire cross-section
Materials

Bottom section of the housing PA (reinforced)

Housing cover ABS with window (PMMA)

Bulb and capillary Cu (copper)
Weight Single thermostat approx. 0.225 kg

Max. +120 °C

suitable for 6 to 12 mm cable diameter

With 230 V AC
+10 %

With 230 V DC
+10 %

With 230 V AC
+10 %

With 230 V DC
+10 %

A shift of the switching point arises when the ambient temperature
at the knob and at the capillary deviates from the calibration am
bient temperature of +22 °C:
Higher ambient temperature→Lower switching point
Lower ambient temperature→Higher switching point

This influence is minimized by temperature compensation.

Double thermostat approx. 0.45 kg

NC contact:
NO contact:

NC contact:
NO contact:

NC contact:
Signal contact:

NC contact:
Signal contact:

16 A (2.5); cosϕ= 1 (0.6)

6.3 A (2.5); cosϕ= 1 (0.6)

0.25 A

0.25 A
16 A (2.5); cosϕ= 1 (0.6)

2 A (2.5); cosϕ= 1 (0.4)

0.25 A

0.25 A

-

EB 5206 EN 5

Design and principle of operation

Switching

differential

Type Set point range
Safety temperature monitor (STM)

5343-1 0 to +60 °C

5343-2 +40 to +100 °C

5343-3 +70 to +130 °C

5343-4 +35 to +95 °C

Temperature regulator (TR)

5344-1 0 to +120 °C

5344-2 +20 to +150 °C 4 K

Safety temperature limiter (STL)

5345-1 +70 to +130 °C 10 K

5345-2 +30 to +90 °C

Double thermostat TR/STL

TR: 0 to +120 °C

5347-1

STL: +70 to +130 °C

Double thermostat TR/STM

TR: 0 to +120 °C

5348-1

STM: +70 to +130 °C

Double thermostat STM/STL

STM: +70 to +130 °C

5349-1

STL: +70 to +130 °C

approx. Switching point accuracy

8 K

8 K

8 K

8 K

3 K

10 K

3 K

8 K

3 K

8 K

8 K

8 K

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

Range
Range

0 to +30 °C:

+30 to +60 °C:
+40 to +70 °C:

+70 to +100 °C:

+70 to +100 °C:

+100 to +130 °C:
+35 to +65 °C:

+65 to +95 °C:

0 to +60 °C:

+60 to +120 °C:
+20 to +85 °C:

+85 to +150 °C:

+70 to +100 °C:

+100 to +130 °C:

+30 to +60 °C:
+60 to +90 °C:

0 to +60 °C:

+60 to +120 °C:

+70 to +100 °C:

+100 to +130 °C:

0 to + 60 °C:

+60 to +120 °C:

+70 to +100 °C:

+100 to +130 °C:

+70 to +100 °C:

+100 to +130 °C:

+70 to +100 °C:

+100 to +130 °C:

+0 K
+0 K

+0 K
+0 K

+0 K
+0 K

+0 K
+0 K

+6 K
+3 K

+6 K
+3 K

+0 K
+0 K

+0 K
+0 K

+6 K
+3 K

+0 K
+0 K

+6 K
+3 K

+0 K
+0 K

+0 K
+0 K

+0 K
+0 K

–12 K

–5 K
–5 K

–12 K

–5 K

–12 K

–5 K

–12 K

–6 K
–3 K

–6 K
–3 K

–5 K

–12 K

–5 K

–12 K

–6 K
–3 K

–5 K

–12 K

–6 K
–3 K

–5 K

–12 K

–5 K
–12 K

–5 K
–12 K

Max.

medium

temp.

+85 °C

+125 °C

+155 °C

+120 °C

+145 °C

+175 °C

+155 °C

+115 °C

+145 °C

+145 °C

+145 °C

6 EB 5206 EN

Design and principle of operation

2.3 Mounting accessories

Thermowells

The thermostat is supplied without a thermowell. The following thermowells are available for
single and double thermostats as accessories:

Thermowells for single thermostat Max. pressure at 150 °C
Nickel-plated brass · CuZn (2.0401)

100 x 8 mm
150 x 8 mm
200 x 8 mm

CrNiMo steel (1.4571)

100 x 8 mm
150 x 8 mm
300 x 8 mm

Thermowells for double thermostat Max. pressure at 150 °C
Nickel-plated brass · CuZn (2.0401)

100 x (2x 8 mm)
150 x (2x 8 mm)

CrNiMo steel (1.4571)

150 x 15 mm
300 x 15 mm

48 bar 1400-9844
48 bar 1400-9845
48 bar 1400-9846

88 bar 1400-9848
88 bar 1400-9849
88 bar 1400-9850

48 bar 1400-9901
48 bar 1400-9851

48 bar 1400-9853
48 bar 1400-9854

Note: The scope of delivery of the thermowell includes:

–

A clip to fasten the capillary to the thermowell (see section 3.3.1)

–

A small metal plate with screw to attach the thermostat to the thermowell (see sec
tion 3.3.2)

Order no.

Order no.

-

Strap

Strap for mounting the contact thermostat
(15 to 100 mm pipe diameter)

1400-9865

EB 5206 EN 7

Installation

3 Installation

NOTICE!

On installing the thermostat, follow the in
structions described below to prevent dam
age to the thermostat and to ensure it can
function properly:

The degree of protection IP 54 cannot be

–

met when the seals are missing or when
they are incorrectly inserted into the ther
mostat (Fig. 1)!
Do not remove the seals in the housing
(1) and on the set point adjuster of the
temperature regulator (4).
The thermostat must only be operated
with inserted seal (6).
A damaged capillary will cause the mea-

–

suring fluid to leak out (see Table 1) lead­ing to the permanent failure of thermostat!
Do not bend or cut the capillary. The
smallest bending radius must not be
smaller than 5 mm.

Table 1 · Properties of the measuring fluid

Dangerous reaction No

Ignition temperature +375 °C

-

Water pollution Class 1

-

Toxicological specifications

Irritant No

Risk to health No

-

Toxic No

Slightly contaminating

3.1 Mounting position

Contact thermostat

The thermostat must not be suspended with
the bottom of the housing (containing the
bulb) facing upwards.

Thermostat with thermowell

Any mounting position can be chosen.

1 Thermostat
2 Bulb
3 Capillary
4 Set point adjuster (TR only)
5a Spring for unlocking (STL only)
6 Seal

Seals necessary to achieve degree
of protection IP 54

Fig. 1 · Seals necessary to achieve degree of protection IP 54

8 EB 5206 EN

Installation

3.2 Contact thermostat

You can attach single thermostats to pipes
with diameters between 15 and 100 mm. A
strap is required in this case (see section 2.3
on accessories).

1. Insert seal (6) as shown in Fig. 2.

2. Thread the strap (8) behind the bulb
holder at the back of the housing (1).

3. Use the strap to attach the thermostat to
the pipe.

4. Unscrew the front cover of the thermo
stat.

5. Perform electrical connection as de­scribed in section 4.

6. Screw front cover back onto the thermo­stat.

TR: Place the set point adjuster onto the

temperature regulator.

1 Thermostat
2 Bulb
6 Seal
8 Strap

Fig. 2 · Mounting a contact thermostat

-

3.3 Thermowell

Note: The bulbs of double thermostats share

the same thermowell. See section 2.3.

Before attaching the thermostat, uncoil the
length of capillary required:

For wall mounting, the required length

4

depends on the required capillary and
length of the thermowell

For mounting the thermostat on tanks/in

4

pipes, the required length depends on
the length of the thermowell

NOTICE

Do not pull at the bulb on uncoiling the cap­illary! The capillary tube may break.

1. Unscrew front cover from the thermo­stat.

2. Detach the bulb from the back of the
thermostat.

3. Route the bulb through the back of the
housing to the front.

4. Uncoil the capillary to the required
length (Fig. 4a).

5. Route the bulb back again through the
back of the housing (Fig. 4a).

6. Insert seal (6) as shown in Fig. 4b or
4c.

Proceed as described in section 3.3.1 or in
section 3.3.2 depending on how the ther
mostat is to be mounted.

-

EB 5206 EN 9

Installation

3.3.1 Wall mounting with thermo

-

well in a different location

The thermostats are fastened to the wall
using two screws (not included in the scope
of delivery).

7. Drill holes in wall as shown in Fig. 3.

8. Insert seal (6).

9. Fix the capillary in the notch at the side
of the thermostat housing or let it run
down the middle (Fig. 4b).

10. Fasten the back of the housing (1) using
two screws to the wall.

11. Screw the thermowell (7) into the pipe
or tank.

12. Push the bulb (2) as far as it will go into
the thermowell (7).

13. Fasten the capillary (3) to the
thermowell (7) using the supplied clip
(7a).

14. Perform electrical connection as de­scribed in section 4.

15. Screw front cover onto the thermostat.

TR: Place set point adjuster onto the temper

ature regulator.

3.3.2 Mounting on tanks or in
pipes

The thermostats are attached to the
thermowells which are screwed into place.

7. Insert seal (6).

8. Screw thermowell (7) into the pipe or

tank.

9. Insert small metal plate (7b) at the back

of the housing (1) and secure in place
with the screw (7c).

10. Push the bulb (2) as far as it will go into

the thermowell (7), making sure that the
round hole at the back of the housing
(1) rests on the collar on the thermowell.

11. Push the thermostat slightly lengthways

to allow the thermowell to engage.

12. Tighten screw (7c) until the housing is

fixed into place on the thermowell.

13. Perform electrical connection as de-

scribed in section 4.

14. Screw front cover onto the thermostat.

TR: Place set point adjuster onto the temper

-

ature regulator.

-

Single
thermostat

Fig. 3 · Drill patterns

10 EB 5206 EN

42.4

Double
thermostat

95

Ø 4.5

95

95.4

Ø 4.5

Fig. 4a · Uncoiling the capillary

Installation

Fig. 4b · Wall mounting with the thermowell in a
different location

7a 3

7

1

2

6

Fig. 4 · Mounting the thermowell

Fig. 4c · Mounting on tanks or in pipes

1 Thermostat
2 Bulb
3 Capillary
6 Seal
7 Thermowell
7a Clip
7b Small metal plate
7c Screw

EB 5206 EN 11

Electrical connection

4 Electrical connection

DANGER!

Risk of electric shock!

For electrical installations, you are re

–

quired to observe the regulations con
cerning electrical power installations ac
cording to DIN VDE 0100 as well as the
regulations of your local power supplier.
Use a suitable power supply to ensure

–

that no dangerous voltages from the sys
tem or parts of the system reach the
thermostat in standard operation or in
case of a fault.
Connect the thermostat at the PE terminal

–

to the ground wire. This wire must have
at least the same cross section as the
supply cable.
The wires of double thermostats are

–

routed through the opening in the inter­mediate wall to the second thermostat.
Seal the opening not used for cable entry
with a blanking cap.

Cable entry

Route the wires through the cable gland
(M20 x 1.5) into the inside of the thermo
stat.

The spring-clamp terminals are designed for
a wire cross-section of 0.75 to 2.5 mm².

Wiring the thermostat

Open the thermostat housing and wire the
thermostat according to Fig. 5:

Rigid wire ends: Strip 11 to 13 mm insu

4

lation off the cable and place it into the
terminal point ( ) as far it will go.

Flexible wire ends without ferrules: Use

4

a slotted screwdriver to keep the spring
open (in ) and place the wire ends
into the terminal point ( ) as far they

-

-

-

will go.
Flexible wire ends with ferrules: Fit

4

ferrule to wire ends. Refer to
EN 60947-1. Use a suitable crimping

tool!

Place the wire ends into the terminal

-

point ( ) as far they will go.

Note: The wire ends can be pulled out by
holding the spring open with a slotted
screwdriver (in ).

NC contact 1 – 2
NO contact 1 – 4

-

1

Temperature
Regulator (TR),
Safety Temperature
Monitor (STM)

-

Safety Temperature
Limiter (STL)

Fig. 5 · Electrical wiring

42

1

42

12 EB 5206 EN

Operation

5 Operation

5.1 Temperature regulator (TR)

Adjust the set point at the set point adjuster
(4).

Limiting the set point range

The lower range value and upper range
value of the set point range can be limited.

4a

4

4 Set point adjuster
4a Pin to limit the set point range

5.2 Safety temperature
monitor (STM)

Open the thermostat housing and adjust the
set point using a screwdriver.

5.3 Safety temperature
limiter (STL)

Open the thermostat housing and adjust the
set point using a screwdriver.

Resetting the safety temperature limiter

Note: The safety temperature limiter can

only be reset after the temperature has fallen
below the adjusted limit by approximately
10 %.

Use a screwdriver to unlock the thermostat.

5a

1. Turn the set point adjuster (4) to a value
within the required temperature range.

2. Pull the set point adjuster (4) off the
temperature regulator.

3. Break off the pin (4a).

4. Insert the pin (4a) at the point where the
temperature is to be limited (min./max.
temperature).

5. Place the set point adjuster back on the
temperature regulator.

5

5 Screw lid
5a Spring for unlocking

1. Open screw lid (5).

2. Use a screwdriver to move the spring
(5a) from the bottom to the top as far as
it will go.

EB 5206 EN 13

Lead sealing

6 Lead sealing

NOTICE

Only lead-seal in the gray-colored area,
otherwise the thermostat cannot function
properly.

Note: You have to drill the holes for the lead
sealing. The lead seal is not included in the
scope of delivery.

7 Dimensions in mm

Single thermostats

Type 5343 Safety Temperature Monitor (STM)

53 42.4

22

**

30

15

8

16

Dimensions with thermowell (accessories)

58

˚C

14 EB 5206 EN

120

150

Ø 4.5

95

300

200

150

15

G1/2

100

Ø8

Dimensions in mm

Type 5344 Temperature Regulator (TR)

53 42.4

22

120

˚C

150

Type 5345 Safety Temperature Limiter (STL)

53 42.4

22

120

150

**

Ø 4.5

95

**

Ø 4.5

95

Dimensions with thermowell (accessories)

70

15

300

200

150

100

G1/2

Ø8

Dimensions with thermowell (accessories)

63

58

15

300

200

150

100

G1/2

Metal plate and screw for fastening the thermostat onto the thermowell (wall mounting)

**

Ø8

EB 5206 EN 15

Dimensions in mm

Double thermostats

Type 5347 Double Thermostat TR/STL

Type 5348 Double Thermostat TR/STM

Dimensions with thermowell (accessories)

70

100

150

300

G1/2

Ø15

Dimensions with thermowell (accessories)

70

100

150

300

G1/2

16 EB 5206 EN

Ø15

Dimensions in mm

Type 5349 Double Thermostat STM/STL

Metal plate and screw for fastening the thermostat onto the thermowell (wall mounting)

**

Dimensions with thermowell (accessories)

63

58

100

150

300

G1/2

Ø15

EB 5206 EN 17

18 EB 5206 EN

EB 5206 EN 19

SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt am Main · Germany
Phone: [phone] · Fax: [phone]
Internet: http://www.samson.de

EB 5206 EN

2009-01