Temperature setting and control the ecp cooler, Checking the temperature sensor, Figure 6 – M&C TechGroup ECP20-2 Operator's manual User Manual
Page 19: Temperature setting, Figure 7
19
Gas sampling and gas conditioning technology
3-1.10-ME
17
TEMPERATURE SETTING AND CONTROL THE ECP COOLER
The gas cooler is set by manufacturer to a
control temperature of +5°C.
This temperature can be adjusted with a
trimmer Potentiometer P3 within a range
of 0°C to +20°C.
This Potentiometer is located on the
ECP20 control board.
Turning clockwise will increase the
temperature and turning counterclock will
decrease the temperature respectively.
To set the temperature it is measured at
the reference terminals (X7/1) using an
external DC-Voltmeter (0,1Volt/°C). The
current temperature can be measured at
terminals (X7/3).
Figure 5 Temperature setting
To prevent the heat exchangers freezing up, the temperature should never be set to below +2°C.
18
CHECKING THE TEMPERATURE SENSOR
The ECP20 cooler temperature sensor is a PT100 element as from serial numbers 95... . There are
two methods for checking the PT100 element, as follows:
1. Voltage method
In order to check the sensor for the cooler currently in operation, the actual voltage at the
corresponding measuring sockets
must be measured (see ‘Temperature Setting and Control’). The
following figure shows the voltage characteristics in relation to temperature. If the measured voltage is
inside the shaded area, the sensor is defective and must be replaced.
°C
V
o
lt
a
g
e
-3
-2
-1
0
1
2
3
4
-30
-20
-10
0
10
20
30
40
Figure 6
Voltage in relation to the temperature of the cooler
P3
+
-
Temperature
100mV/°C
Current
temperature
Ri>100K
Reference
temperature