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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
▸
Loosen the 4 hexagon socket screws on the measuring cell flange and remove the
measuring cell from the measuring probe.
▸
Clean the flange on the measuring probe with fine sandpaper.
▸
When assembling, the volume reducer must be installed so that the product is Ex-
compliant.
▸
Screw the new measuring cell with new seal and 4 new screws to the measuring cell
flange of the measuring probe.
▸
Tighten the 4 hexagon socket screws with a hexagon socket wrench crosswise.
▸
Now lead the inner part of the measuring probe into the measuring probe without tilting
it. Press the locking bolt against the spring so that the inner part is pressed against the
measuring cell with sufficient spring force.
▸
Then connect the cables as shown:
▸
Install the analyzer unit and let the system heat up to operating temperature. Perform a
two-point adjustment after 24 hours of operation.
8.6.5
Replacing the inner part of the analyzer unit
Perform replacement as described in Chapter “Replacing the O
2
measuring cell” to remove
the inner part of the measuring probe. An exception is the thermoelement replacement, as
the inner part of the measuring probe does not have to be removed here.
8.6.6
Visual check of the flameproof enclosure
Check the flameproof enclosure is ensured:
▸
If the enclosure is damaged, have the enclosure and enclosure cover replaced by
SICK AG.
▸
Check all threads for damage.
▸
Do not paint or varnish the threads.
▸
If the threads are damaged, have the enclosure and enclosure cover replaced by
SICK AG.
▸
If the protective grease on the threads has become old, remove the protective grease
and grease with new suitable protective grease.
▸
Enclosures with protection class IP66 have seals in the flameproof joint.
▸
Make sure all seals are clean, undamaged and correctly installed.
Terminal
Color
Description
Polarity
Unit
1
White/brown
Signal cable, measuring cell
-
mV
2
Brown
Signal cable, measuring cell
+
mV
3
Green
Thermoelement
+
mV
4
White
Thermoelement
-
mV
6
Black
Measuring probe heater
7
Blue
Measuring probe heater
8
Green/yellow
Protective conductor heating
9
Black
Solenoid valve (optional)
10
Black
Solenoid valve (optional)