Installation
30
GA01212_002_C1 - 04/2017 - © Leybold
3.4.2 Connecting monitoring facilities
How to connect the monitoring devices (pressure sensor for monitoring the
pressure in the oil box, the pump as well as the temperature sensors PT100
(on the intake and the exhaust sides)) is described in the enclosed manufac-
turer’s information on the individual components. The separators used must
be of the intrinsically-safe circuit-type and must carry the appropriate ATEX
certification.
The signal from the pressure transducer needs to be processed by the sys-
tem controller such that the motor is switched off at a pressure of 0.5 bar (g).
The PT 100 temperature signals need to be acquired by the operator of the
system controller so as to produce the shutdown signal for the motor of the
vacuum pump. The permissible temperature for the admitted gas must not
exceed 60 °C; on the exhaust side a maximum temperature of 128 °C is per-
missible. The signals need to be processed in accordance with the informa-
tion provided by the manufacturer of the sensor.
After switching off the pump it must be ensured that there is no further flow
or backflow of media in either direction. If applicable provide for correspond-
ing shut-off devices.
Use a cable diameter that is appropriate for the corresponding feedthrough.
Ensure for a correct seating of the plug used, and that all sealings are
un dam aged and mounted. Tighten the fitting and re-check that all sealings
are properly in place, to conform with the type of protection (IP54 IAW
IEC 60 529). (The IP Codes specified apply only in the plugged condition with
cable connectors (sockets) complying with the corresponding protection rat-
ing.) Make sure that no moisture can enter at the cable heads.
Fig. 8b Connection diagram (monitoring facilities)
U+ = 1 U- = 2
rot
rot
weiß
weiß
weiß
weiß
rot
rot
PT100, 4-Leiter
IS-20-S, 2-Leiter
Druckmessumformer
Temperatursensor
red
red
white
white
Pressure
transmitter
Temperature sensor
IS-20-S,
2
conductors
PT100,
4
conductors
red
white
red
white
