Operating Instructions Resistance Thermometer WTH 160-250
Contents
1. 180 C Marking Every resistance thermometer WTH 160 250 is provided with a label at the end of the connection cable see fig H Heinz Messwiderstande GmbH 0341 lt lt Manufacturing date check number YYWW WTH 160 250 amp 2G EEx m Il This label gives all essential information on the resistance thermometer type manufacturing date explosion hazard Manufacturer H Heinz Messwiderstande GmbH Goethestrasse 16 D 98716 Elgersburg2. Operating Instructions Resistance Thermometer WTH 160 250 Description The resistance thermometer type WTH 160 250 is designed to measure the temperature of high voltage motors in end shields or windings and at other points respectively which are suitable for measuring the temperature of this unit It can be screwed in directly A sensor sleeve with a rotatable special purpose screw M6 mounted on top houses a platinum thin film resistance element A soldered connection connects this resistance element with the shielded connecting lead Both the resistance element and the connecting point to the connecting lead are completely covered with potting compound For the purpose of strain relief the connecting lead is pressed in a transition sleeve connected with the sensor sleeve and embedded in a second transition sleeve Protection against buckling is achieved by an elastic potting compound filled into the second transition sleeve after the fixing compound has been applied A stainless steel spring is provided on the second transition sleeve for further protection against kinking Equipotential bonding of the resistance thermometer WTH 160 250 is reached by screwing the sensor into the metal casing of the motor The resistance thermometer WTH 160 250 can be provided with one or two resistance sensors One sensor is suitable for thermometers with 2 3 or 4 wire connections and two sensors for thermometers with 2 and 3 wire connections only The install
3. ation of the component has to be specified in the certificate of conformity of the electrical equipment concerned Damage to cables or insulation must be avoided during installation The connecting cable must be laid in a strain relieved manner The cable ends must be firmly connected to suitable terminals The sensor cable has to be connected to purpose designed supply equipment for passive resistance sensors only which is approved for the operation of the unit and in accordance with the standard applicable for the resistance thermometer The supply equipment must have one or two connections which are adequate for the existing wiring The electrical parameters must not be exceeded The type of protection encapsulation EEx m Il is provided by embedding the resistance element in potting compound and installation of the resistance thermometer type WTH 160 250 The materials selected ensure a working temperature range of the resistance thermometer between 50 C and 180 C The AC proof voltage of the thermometer is 1kV Parameters Operating voltage U lt 30 V Sensor current maximum 2 mA Maximum power 10 mW Maximum energy 10 Joule Self heating lt 1K at maximum power in still air Nominal resistance 100 Q 0 C 500 Q 0 C 1000 2 0 C AC proof voltage 1 0 kV 50 Hz 1 min Number of sensors 1or2 Connection method 1 sensor 2 3 or 4 wire connection 2 sensors 2 and 3 wire connection Working temperature range 50 C
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