Operating Manual - Webshop, Gas Analysis Technology

Figure 12 shows the voltage characteristics in relation to temperature. If the measured voltage isinside the shaded area, the sensor is defective and has to be replaced.V43210-1-2-3-30 -20 -10 0 10 20 30 40°CFigure 12 Voltage in relation to the temperature of the cooling stage29Resistance methodIn this case the sensor must be disconnected from pins 1 and 2 at the EC automatic control board(Fig. 9) and removed from the cooling block. When measuring the resistance of the PT100 element,this must be proportional to the ambient temperature. The resistance-temperature characteristics areshown in Figure 13 below.Ohm117115113111109107105103101999795-10 0 10 20 30 40Figure 13 Resistance-temperature characteristics of the PT100 temperature sensor°C19.2 CHECKING THE TEMPERATURE SENSOR OF THE DEEP COOLING STAGEIn order to check the sensors for the low-temperature stages and , the voltage at the EC30 controlboard should be measured between pins 27 and 28 (fig. 15) for channel 1 and between pins 33 and34 for channel 2. Figure 14 allocates a corresponding voltage value for a given temperature value.This should be compared with the measured voltage value.Gas sampling and gas conditioning technology3-4.20-ME