Mounting and
Operating Instructions
EB 2231 EN
Edition May 2016
Self-operated Regulators
Thermostats
Type2231 and Type2232 Bulb Sensors
Type2233, Type2234, and Type2235
Air Sensors
Type2231 with
bulb sensor
Type2232 with bulb
sensor (separate)
Type2233 with air
sensor
Type2233 with
perforated cover
Type2235 with freely
installable air sensor and
clamp (on the set point
adjuster)
Type2234 with air sensor
and clamp
Type2234 with
bulb sensor
(separate) and
clamp (on the set
point adjuster)
2 EB 2231 EN
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.
Î For the safe and proper use of these instructions, read them carefully and keep them for
later reference.
Î If you have any questions about these instructions, contact SAMSON‘s After-sales Service
Department (aftersalesservice@samson.de).
The mounting and operating instructions for the devices are included in
the scope of delivery. The latest documentation is available on our website
(www.samson.de) > Product documentation. You can enter the document
number or type number in the [Find:] eld to look for a document.
Denition of signal words
Hazardous situations which, if not avoided,
will result in death or serious injury
Hazardous situations which, if not avoided,
could result in death or serious injury
Property damage message or malfunction
Additional information
Recommended action
DANGER
!
WARNING
!
NOTICE
!
Note
Tip
Contents
EB 2231 EN 3
1 Design and principle of operation ..................................................................3
2 Installation ....................................................................................................4
2.1 Types2231 and 2232 (bulb sensor) ................................................................4
2.2 Types2233, 2234, and 2235 (air sensor) .......................................................6
2.3 Capillary tube ...............................................................................................6
2.4 Operating element .........................................................................................7
3 Operation .....................................................................................................7
3.1 Adjusting the set point ....................................................................................7
3.2 Correcting the set point dial ............................................................................7
1 Design and principle of oper-
ation
The thermostat is used in combination with a
control valve to regulate the temperature.
The thermostat can be fastened directly to
the control valve or using a double adapter.
A double adapter with or without locking facility allows a further thermostat to be connected to achieve additional temperature
regulation or limitation.
The thermostat comprises the temperature
sensor, set point adjuster, capillary tube, and
operating element.
Depending on the eld of application, the
versions shown on the front cover can be selected.
The thermostats operate according to the liquid expansion principle. When, for example,
the temperature at the temperature sensor
(19) increases, the liquid contained in the
sensor expands, causing the pin (9) of the
operating element to be pushed upward by
the bellows (10). This travel motion acts on
4 EB 2231 EN
Installation
the plug stem of the connected valve and
moves the valve plug until the temperature
reaches the adjusted set point.
The temperature set point can be adjusted
using a key (12). By turning the key, a
spindle moves the piston (18) up or down,
causing the volume of the liquid contained in
the sensor (19) to change. As a result, the
valve plug moves within its operating travel
according to the adjusted set point within a
higher or lower temperature range measured
by the sensor.
Typetesting
The Types2231 to 2235 Control Thermostats
have been tested together with control valves
by the German Technical Inspectorate (TÜV)
in accordance with DINEN3440. The register number is available on request.
EAC compliance
The thermostats bear the EAC mark of conformity.
2 Installation
2.1 Types2231 and 2232
(bulb sensor)
Bulb sensors are used to measure the temperature of liquids. They are designed for installation in pipelines, heat exchangers, boilers, baths, tanks, etc.
Installation recommendations
− Select the place of installation ensuring
that the sensor is installed as close as
possible to the heat source, but avoid
exposing it to overheating.
− When mounted in a boiler, we recom-
mend installing the sensor in the top third
of the boiler.
− When mounted in a counterow heat ex-
changer, we recommend installing the
sensor in a pipe elbow, directly behind
the pipe end socket piece.
− In plants with only temporary heat
consumption, a circulation pipe must be
provided when the regulator is mounted
on a counterow heat exchanger to
ensure that the sensor can respond to
temperature changes in the counterow
heat exchanger even when no water is
tapped.
Installation
Î Weld on a pipe socket with female
thread (socket-weld design) of approx.
40mm in length at the place of
installation (this also applies when a
thermowell is used).
Î Remove the double nipple (17) or ther-
mowell (if used) from the sensor (19) and
seal it into the welded socket.
Î Adjust the highest possible set point on
the set point dial (13) using the key (12).
Insert the sensor with seal into the double
nipple or thermowell. Secure it with the
coupling nut (16). The entire length of the
temperature sensor (19) or thermowell
must be immersed in the process
medium.
EB 2231 EN 5
Installation
7 Coupling nut
8 Operating element
9 Pin of operating element
10 Operating bellows
11 Capillary tube
12 Key
13 Set point dial
14 Spindle
15 Excess temperature
protection
16 Coupling nut
17 Double nipple
18 Piston
19 Temperature sensor
1
1
1
1
1
1
12
13
15
16
1
7
19
18
14
11
10
9
8
7
Control valve, double
adapter or reversing
device
Fig.1: Sectional drawing
1 Type
2 Conguration ID
3 Date
4 Limit
5 TÜV or DIN number
6 Size
7 Valve size
8 Pressure or temperature range
SAMSON
x
Gr. DN
Made in Germany
bar
°C
bar
°C
123
5
67 8
4
Fig.2: Nameplate
6 EB 2231 EN
Installation
Thermowell: When a thermowell is used, we
recommend lling the free space between
sensor and thermowell with oil or, when installed horizontally, with grease or any other
heat transfer medium to avoid delays during
heat transmission. Observe the thermal ex-
pansion of the lling medium. Do not ll the
entire free space or slightly loosen sensor nut
for pressure compensation.
Galvanic corrosion due to incorrectly selected materials of the mounting parts.
On installing the sensor or thermowell, only
combine the same kind of materials (e.g.
stainless steel with stainless steel or copper
together with other copper materials).
2.2 Types2233, 2234, and
2235 (air sensor)
Types2233 and 2234 are designed for installation in air heaters, air ducts, drying
cabinets, etc. Install the sensor from the outside into the room and secure it with a special clamp (accessories). The entire length of
the sensor must be immersed in the air ow
to be regulated.
For Type2234, install the set point adjustment in an easily accessible location.
Avoid locations with considerable ambient
temperature uctuations.
Type2233 with perforated cover is generally used for installation in manufacturing facilities, living spaces, baths, etc.
Installation recommendations
− Mount the sensor protected by a perfo-
rated cover to a suitable location, if possible in the middle of the wall.
− Type2234 with clamps (or perforated
cover) is suitable for installation in drying chambers, dryers, air heaters, incubators, etc. In case of forced air circulation, install the sensor near the supply air
inlet. Mount the set point adjustment outside the room to be controlled in an easily accessible location. The set point adjustment must be exposed to a temperature that is as constant as possible.
− Type2235 is equipped with a tempera-
ture sensor to be calibrated on site. This
allows the measurement of almost all
temperature layers. Make sure the set
point adjustment for this sensor is installed outside the room to be controlled
in an easily accessible location. Avoid
locations with considerable ambient tem-
perature uctuations.
− When regulating the temperature in
greenhouses, make sure that the thermostat and set point adjuster are not exposed to direct sunlight. When the temperature regulating system is shut down
during the summer, adjust a high set
point to protect the thermostat.
2.3 Capillary tube
Î Carefully run the capillary tube (11)
without bending or twisting it and do not
expose to any temperature uctuations, if
possible.
NOTICE
!
EB 2231 EN 7
Operation
Risk of malfunction due to capillary tube
damage.
− Do not damage or shorten the capillary
tube.
− Roll up excess tube to form a ring (smallest
bending radius = 50mm).
2.4 Operating element
Î Attach the operating element (8) to the
valve body or double adapter using the
coupling nut (7).
3 Operation
3.1 Adjusting the set point
Only use the key (12) to adjust the required
temperature set point at the set point dial
(13).
Î Slowly turn the key clockwise to increase
the temperature and counterclockwise to
reduce it.
Î Read off the temperature at the reference
thermometer of the plant and readjust
with key, if necessary.
Higher set point temperatures can be adjusted in increments as required. However, to
lower the set point temperature, proceed in
steps of 10 to 20°C. When doing so, wait
for the process medium to cool down before
continuing (watch the thermometer).
3.2 Correcting the set point
dial
Due to special conditions on site, the temperature adjusted at the set point dial might
not be the same as the reading at the reference thermometer. If this is the case, proceed
as follows:
Î Undo the screw labeled "Korrektur" on
the back of the dial housing.
Î Turn the entire dial housing until the dial
shows the same temperature as the reference thermometer.
Î Turn clockwise to increase the set point
and counterclockwise to reduce it
(viewed from the front with the dial housing on top).
Î A 360° turn corresponds to a set point
change of approx. 1.5°C.
NOTICE
!
Note
SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
samson@samson.de · www.samson.de
EB 2231 EN
2018-03-28 · English
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