16
WIKA operating instructions gas density monitor model GDM-63
EN
14502554.01 07/2021 EN/DE
Faults
Causes
Measures
Contact is no longer
switching in accordance
with the specification
Electrical connection is
interrupted
Carry out a continuity test on the
electrical connection leads
Electrical load unsuitable for
the switch contact model
Maintain the permissible
electrical loads for the switch
contact model
Contact contaminated
Switching status remains
unchanged despite
reaching the switch point/
reset point
Contacts defective (e.g.
fused contact zone)
Replace instrument. Before
recommissioning the new
instrument, provide a protective
circuit for the contact
No pointer movement
despite change in pressure
Movement blocked
Replace instrument
Pointer movement, even
though depressurised
Warming or cooling of the
measuring instrument (no
damage)
Let the instrument settle for
2 hours at 20 °C [68 °F]
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
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.
6 Faults / 7. Maintenance, cleaning and recalibration
