PTR 225 / PTR 225 S PTR 237 - Schoonover, Inc.

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2.2.5 Identification For the purpose of identifying the connected type of transmitter and the pressure range, the PENNING transmitter is equipped with an identification resistor (R = 100 kΩ) between Pin 4 and Pin 2. This resistor may be sensed by connected operating or control units so that these can automatically adapt. Key to Fig. 4 1 Monitor output 2 Potentiometer for adjustment of the switching threshold 3 LED (green) 4 Connector Pin 1 Ground Pin 2 Normally open relay contact Pin 3 Center relay contact Pin 4 Normally closed contact 2.2.6 Switching Threshold (PTR 225 S) The built-in switching threshold may be adjusted through potentiometer (4/2) in the range between 1·10 -3 -1·10 -9 mbar. To adjust the threshold remove the cap (4/2) and use a screwdriver to adjust the threshold to the desired level. In order to check the adjustment, a voltmeter may be connected to the monitor output (4/1) (see Section 2.2.7 and Table 1 in the Annex). The threshold switch is a floating relay (changeover contact) which may be accessed via pluggable screw terminals (4/4). When the pressure drops below the adjusted threshold, a green LED (4/3) comes on. In the case of a fault (i.e. discharge not present) or if the supply voltage has been switched off the relay contacts return to their rest position. Fig. 4 PENNING transmitter PTR 225 S 1 4 1 2 3 4 14 GA 09.308/4.02 - 05/97 14
2.2.7 Monitor Output The monitor output (4/1) is accessible through a 3.5 mm jack socket so that the measurement signal and the trigger setting may be measured. The stereo jack plug which is included with the instrument may be used to connect a voltmeter, for example. For this also refer to Fig. 5. 2.3 Start-up Connect the PENNING transmitter PTR 225, PTR 225 S or PTR 237 according to Section 2.1 and 2.2. Warning A high tension which is dangerous when touched is applied to the sensor in the PENNING transmitter. You must always switch off the supply voltage for the transmitter before starting any work on the transmitter (even when removing the transmitter from the connection flange) so as to avoid injury when inadvertently coming in to contact with the high tension. Value for the trigger threshold Measurement signal Fig. 5 Jack plug for the monitor output GA 09.308/4.02 - 05/97 15 15
Page 1 and 2: Vacuum Pumps Instrumentation Fittin
Page 3 and 4: 1 Description 1.1 General The PENNI
Page 5 and 6: Status displays Operation (POWER) R
Page 7 and 8: 0.66 V to 10 V. Moreover, the high
Page 9 and 10: 73 80 POWER READY 114 126 4 12 DN 2
Page 11 and 12: + 10,5 V High tension switchover 2,
Page 13: 2.2.3 Measurement Signal Output The
Page 17 and 18: 2.3.2 Measurement System Status Ind
Page 19 and 20: 3 Maintenance 3.1 LEYBOLD Service I
Page 21 and 22: In the case of severe contamination
Page 23 and 24: Characteristic PTR 225 / PTR 225 S
Page 25 and 26: 1 TTR 211 S 3 5 0...10 V 2 1 PTR 22
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PTR 225 / PTR 225 S PTR 237 - Schoonover, Inc.

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