LEYBOLD IONIVAC ITR 90, Operating Manual

Page: 37 / 50

Maintenance, Repair
GA09420_002_C0 – (2016-10) –

Leybold 37
6 Maintenance, Repair
6.1 Maintenance
DANGER
Caution: contaminated parts
Contaminated parts can be detrimental to health and environment.
Before beginning to work, find out whether any parts are contami-
nated. Adhere to the relevant regulations and take the necessary pre-
cautions when handling contaminated parts.
The product is maintenance-free, If clean operating conditions are met.
6.1.1 Cleaning the Transmitter
Small deposits on the electrode system can be removed by baking the anode
(Degas
→  27). In the case of severe contamination, the baffle can be exchanged
easily (
→
 15). The sensor itself cannot be cleaned and needs to be replaced in
case of severe contamination ( →  41).
A slightly damp cloth normally suffices for cleaning the outside of the unit. Do not
use any aggressive or scouring cleaning agents.
Make sure that no liquid can penetrate the product. Allow the product to
dry thoroughly before putting it into operation again.
Transmitter failures due to contamination or wear and tear as well as
expendable parts (filaments) are not covered by the warranty.
6.2 Adjusting the Transmitter
The transmitter is factory-calibrated. Through the use in different climatic condi-
tions, fitting positions, aging or contamination (
→
 27) and after exchanging the
sensor ( →  41) a shifting of the characteristic curve can occur and readjustment
can become necessary. Only the Pirani part can be adjusted.
6.2.1 Adjustment at Atmospheric Pressure
At the push of a button the digital value and thus the analog output are adjusted
electronically to 10 V at atmospheric pressure.
Adjustment is necessary if
• at atmospheric pressure, the output signal is <10 V
• the display reads < atmospheric pressure (if the transmitter has a display)
• at atmosphere, the digital value of the RS232C interface is < atmospheric pres-
sure
•
at atmosphere, the digital value received by the bus controller of the fieldbus
transmitter (Profibus) is < atmospheric pressure
•
when the vacuum system is vented, the output voltage reaches 10 V (limited to
10 V by the software) before the measured pressure has reached atmosphere
•
when the vacuum system is vented, the digital value of the RS232C interface
reaches its maximum before the measured pressure has reached atmosphere.