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2818.2 TEMPERATURE SETTING FOR THE COOLERThe pre-cooling stage is set at the factory to a regulated temperature of +1°C.RUrefCurrent-Temp.P3+ °C -UtempUrefR i > 100kC9Setting-Temp.Connect a d.c. voltmeterto terminals 1, 2 and 3!Figure 11 Temperature adjustmentSetting of the regulated temperature is done by trimming potentiometer P3, on the EC automaticcontrol board of the cooler. The setting range covers temperatures from 0°C to 20°C. Turning it to theright sets a lower temperature, and turning it to the left sets a higher temperature.Connecting an external voltmeter to plugs 2 and 3 allows the nominal set temperature to be read offand controlled. A voltage value of 0.1V corresponds to a temperature of 1°C.It is possible to measure and control the current temperature at measuring sockets 1 and 2.NOTE!Freezing up in the pre-cooling stage will endanger the operation of thecooler unit. For this reason the cooler temperature must never fall below+1°C!19 TEMPERATURE SENSORSThe pre-cooling stage temperature sensor is a PT100 element. STP 35 temperature sensors areavailable for the low temperature stages and .19.1 CHECKING THE TEMPERATURE SENSOR OF THE PRE-COOLING STAGEThere are two methods for checking the PT100 element, as follows:Voltage methodIn order to check the sensor for the cooler currently in operation, the actual voltage at the measuringsockets 1 and 2 of the EC automatic control board must be measured as per section 18.2 above.<strong>Gas</strong> sampling and gas conditioning technology3-4.20-ME
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.<strong>Gas</strong> sampling and gas conditioning technology3-4.20-ME
Page 1: Operating ManualLow-temperature ele
Page 4 and 5: 4Dear customer,we have made up this
Page 6 and 7: 63 SAFETY INSTRUCTIONSPlease take c
Page 8 and 9: 86 INTRODUCTIONThe patented M&C EC3
Page 10 and 11: 108 TECHNICAL DATACooler series EC
Page 12 and 13: 1210 FUNCTIONThe patented M&C EC30(
Page 14 and 15: The heat energy from the cooling sy
Page 16 and 17: 16N O TE!When fixing the connectors
Page 18 and 19: 1814 START-UPThe control electronic
Page 20 and 21: 2015CLOSING DOWNNOTE!The location f
Page 22 and 23: 22Take away conveying beltconnector
Page 24 and 25: 2417 TROUBLE SHOOTINGTroubleshootin
Page 26 and 27: 2618EC AUTOMATICCONTROL BOARDFigure
Page 30 and 31: 30Figure 14 Sensor voltage as funct
Page 32 and 33: 3220.1 FUNCTION SEQUENCE OF THE EC3
Page 34 and 35: 3421 SPARE PARTS LISTWear, tear and
Page 36 and 37: 36Sample outlet dew point (ambient
Page 38 and 39: 38Figure 18 Circuit Diagram EC-30Ga
Page 40: 40Figure 20 Wiring plan automatic c

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