72
8024250/18HT/V2-0/2020-12| SICK
O P E R A T I N G I N S T R U C T I O N S | ZIRKOR200 Ex-G
Subject to change without notice
8
MAINTENANCE
8.3
Information on use in Ex-areas
8.4
Maintenance plan
In general, the maintenance work to be carried out and the necessary maintenance
interval depend on the flue and/or process gas conditions in which the analyzer unit is
installed. Therefore, the appropriate maintenance interval can vary from a few months up
to several years.
The main influencing factors are the presence of corrosive components such as SO
2
or
HCl, a continuous reducing atmosphere (reduced oxygen concentration, increased
concentration of combustible gases) and the nature of the solid components in the sample
gas. These may have the following effects: chemical or mechanic damage to the measuring
probe, clogging of the filter element or accelerated aging of the sensor. This can lead to
both a falsification of the measured values and an increase in the response time, which
can subsequently lead to an incorrect process operation.
For this reason, a sensor check is recommended with test gas and test air every six
months. A 2-point calibration should be carried out after a serious deviation between the
values obtained and those presently anticipated. A visual inspection of the analyzer unit,
which includes cleaning the filter element if necessary, should be conducted at least once a
year.
Deviating from these recommendations, the operator must define a suitable maintenance
interval for his process and measuring location that is appropriate to the safety relevance
of the measurement and the conditions of the process.
DANGER:
Danger of explosion when using spare or expendable parts not approved for
the Ex-area
All spare and expendable parts for the in-situ gas measuring device are tested by SICK
for use in Ex-areas. The use of other spare and expendable parts will invalidate the claim
against SICK because the ignition protection cannot be guaranteed.
▸
Use only original spare parts and expendable parts from SICK.
DANGER:
Danger of explosion through residual voltages and hot surfaces in the device
Danger of explosion during installation and maintenance work on the device.
▸
Ensure the work area is Ex-free when working on the device.
▸
Perform calibration with closed enclosure cover using SICK Remote.
Maintenance interval
[1]
Maintenance work
1M
6M
1Y
x
x
x
Measured value plausibility check
x
x
Check with test air and gas:
– Check sensor adjustment values
– Check the solenoid valve (optional)
– Check the flow volumes
x
x
(As required) Adjustment of the sensor
x
x
Visual check of the analyzer unit:
– Check the measuring probe and the filter head and
clean as necessary
– Check for corrosion
– General check of the flameproof enclosure (
check of the flameproof enclosure”, page 76
)
