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8024252/AE00/V1-0/2020-07| SICK
O P E R A T I N G I N S T R U C T I O N S | ZIRKOR200 Ex-D
Subject to change without notice
8
MAINTENANCE
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Tighten the 4 hexagon socket screws with a hexagon socket wrench crosswise.
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Now reinstall the inner part of the probe and fit the test gas distributor and filter head.
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Install the probe and let the system heat up to operating temperature. Perform a two-
point calibration after two hours of operation.
8.6.9
Replacing the inner part of the measuring probe
Fig. 38: Probe junction unit when removing the inner part of the probe
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Switch off the electronics, remove the measuring probe from the protection tube and let
the probe cool down.
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Disconnect the wires of the inner part in the connection unit (1), two hoses (2) and (3),
loosen two screws (4) and remove retaining plate (5).
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Remove the thin, transparent reference air hose from the feed-through screw
connection on the connection unit.
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The inner part of the probe (4-hole ceramic rod with measuring signal wire,
thermoelement and heater) can now be carefully pulled out.
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Now push the new inner part carefully into the probe tube and screw on the retaining
plate (make sure the inner part remains movable). The inner part is now pressed against
the measuring cell by the retaining plate with spring force.
WARNING: Risk of burns
The temperature of the probe filter head and all parts in the process gas is 150 °C to
800 °C (302 °F to 1472 °F) during operation. Directly touching the parts for
disassembly or maintenance causes serious burns!
▸
Use heat protection gloves when removing the probe.
▸
Switch the electronics supply voltage off before removing the probe.
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Place the probe in a safe, protected area after removal and wait until the probe
temperature has cooled down to the ambient temperature.
