Maintenance, Cleaning And Recalibration - WIKA GDM-63 Operating Instructions Manual

6 Faults / 7. Maintenance, cleaning and recalibration
Faults
Contact is no longer
switching in accordance
with the specification
EN
Switching status remains
unchanged despite
reaching the switch point/
reset point
No pointer movement
despite change in pressure
Pointer movement, even
though depressurised
For claims, the serial and product numbers must be stated. The serial number is printed
on the dial, the product number on the product label. With claims, the atmospheric
pressure and the temperature during the measurement must be given, as well as the
data on the reference standard (model, class).

7. Maintenance, cleaning and recalibration

7.1 Maintenance
These gas density monitors are maintenance-free.
The indicator and switching function should be checked once or twice every year. For
this the instrument must be disconnected from the gas compartment to check with a
pressure testing device.
Repairs must only be carried out by the manufacturer.
The instruments must not be opened, since this can lead to indication and switch point
errors.
7.2 Cleaning
16
Causes
Electrical connection is
interrupted
Electrical load unsuitable for
the switch contact model
Contact contaminated
Contacts defective (e.g.
fused contact zone)
Movement blocked
Warming or cooling of the
measuring instrument (no
damage)
CAUTION!
Physical injuries and damage to property and the environment
Improper cleaning may lead to physical injuries and damage to property
and the environment. Decomposition products in the dismounted
instrument can result in a risk to persons, the environment and equipment.
▶
Carry out the cleaning process as described below.
WIKA operating instructions gas density monitor model GDM-63
Measures
Carry out a continuity test on the
electrical connection leads
Maintain the permissible
electrical loads for the switch
contact model
Replace instrument. Before
recommissioning the new
instrument, provide a protective
circuit for the contact
Replace instrument
Let the instrument settle for
2 hours at 20 °C [68 °F]