Samson 2040 Mounting And Operating Instructions
Self-operated Temperature Regulators
Type 2040
Safety Temperature Monitor (STM)
Mounting and
Operating Instructions
EB 2090 EN
Edition October 2014
Fig. 1 · Type 2040 Safety Temperature Monitor
Contents Page
1 Design and principle of operation. . . . . . . . . . . . . . . . . . . . 4
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Set point adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 New adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Set point adjuster with set point indication . . . . . . . . . . . . . . . . 7
4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 EB 2090 EN
Contents
CAUTION!
Indicates a hazardous situation which, if not
avoided, could result in minor or moderatein
-
jury.
Note! Indicates supplementary explanations,
information and tips.
Definitions of the signal words used in these instructions
EB 2090 EN 3
Safety instructions
General safety instructions
4
The regulator may only be mounted, started up or operated by trained and
experienced 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.
All safety instructions and warnings in these mounting and operating instructions,
particularly those concerning assembly, start-up and maintenance, must be
observed.
4
For appropriate operation, make sure that the regulator is only used in
applications where the operating pressure and temperatures do not exceed the
operating values based on the sizing data submitted in the order.
4
Note that the manufacturer does not assume any responsibility for damage
caused by external forces or any other external factors.
Any hazards which could be caused in the regulator by the process medium or
operating pressure are to be prevented by means of appropriate measures.
4
The Type 2040 Safety Temperature Monitors do not have their own potential
ignition source according to the ignition risk assessment stipulated in
EN 13463-1: 2001, section 5.2, even in the rare incident of an operating fault.
Therefore, they do not fall within the scope of Directive 94/9/EC.
4
The regulator complies with the requirements of the European Pressure Equipment
Directive 97/23/EC. The declaration of conformity issued for a valve bearing the
CE marking includes information on the applied conformity assessment procedure.
The declaration of conformity can be provided on request.
TÜV typetesting/EC type examination
The Type 2040 Safety Temperature Monitors are typetested by TÜV (German technical surveil
lance association). The test mark is available on request.
An EC type examination according to Pressure Equipment Directive 97/23/EC, Module B has
been performed on the Type 2040 Safety Temperature Monitor.
1 Design and principle of oper
-
ation
The Type 2040 Safety Temperature Monitor
protects downstream plants against exces
-
sively low temperatures in applications in
volving the storage of cryogenic media as
well as liquids, gases and vapors.
These safety temperature monitors close
whenever the medium temperature falls be
low the adjusted temperature set point (limit)
to prevent cold media entering the connected
consumer plant.
The safety temperature monitor consists of the
body (1) with integrated temperature sensor
(6) and set point adjuster (3). It operates ac
cording to the liquid expansion principle.
The volume of the temperature-sensitive filling
medium confined in the integrated temperature sensor (6) expands as the temperature
rises and contracts again as the temperature
falls. The valve is normally open. If the medium temperature falls below the adjusted set
point (when the medium is too cold), the liquid
inside the sensor contracts and the tubular
plug (5) is pushed by the positioning springs
(4) against the soft-sealed seat (2). As the me
dium temperature drops, the plug moves in
the closing direction, restricting the medium
flow. If the medium temperature drops fur
ther, the valve is closed completely when the
temperature reaches the adjusted set point.
The set point temperature and the throttling
range in front of it can be adjusted within the
set point range. The valve first opens again
when the medium temperature has exceeded
the adjusted set point by 2 K.
The temperature span between the adjusted
set point temperature T
set point
and the point at
which the regulator starts to close is 17 K. The
valve is fully open (KV= 5) at a medium tem
-
perature of >T
set point
+ 17 K. At a medium
temperature less than T
set point
+ 17 K the medium flow is already throttled and the KVcoefficient gets smaller (Fig. 2).
If the sensor system is defective, the valve
closes (fail-safe position).
4 EB 2090 EN
Design and principle of operation
K
v
-200
0
-3
5
T
T
[˚C]
Fig. 2 · Control behavior
∆
T = 17 K temperature differential between
open and closed (throttling range)
T
set point
= –20 °C (point at which the
regulator is fully closed)
The regulator starts to close when the
medium temperature has dropped below a
value which is still approx. 17 K above the
adjusted set point.
Closed
Open
–20
T
set point
Normal range of
medium temperature
–3
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