INFICON Protec P3000(XL) Helium Leak Detector - Manual (Page 9)

General Safety Precautions
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Caution
Permissible maximum input voltage PLC 28 V.
Caution
Permissible max. voltage and current for open collector outputs are: 28 V; 50 mA.
Caution
Maximum load rating relay outputs is 60 V DC / 25 V AC and 1 A per relay.
Caution
The air filter should be checked for contamination at least every 6 months and
should be definitely exchanged after 2 years.