17
WIKA operating instructions gas density monitor model GDM-100
EN
14300397.03 07/2021 EN/DE/FR/ES
Faults
Causes
Measures
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.
1. Before cleaning, correctly disconnect the instrument from the pressure supply and
switch off the current.
2. Use the requisite protective equipment.
3. Clean the instrument with a moist cloth.
Electrical connections must not come into contact with moisture!
6 Faults / 7. Maintenance, cleaning and recalibration
