75
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
MAINTENANCE
8
1
Disconnect the connection cable analyzer electronics - control unit in the control unit.
2
Loosen the counter flange bolts and remove the analyzer unit.
3
Install the new analyzer unit with a new seal. Determine the flow direction of the flue gas
and align the V shield (
see “Aligning the V-shield”, page 39
4
Fasten the counter flange bolts and connect the connection cable in the control unit.
5
Switch on the supply voltage and wait until the measuring probe has reached the
setpoint temperature.
6
Perform a 2-point adjustment under process conditions.
8.6.4
Replacing the O
2
measuring cell
Fig. 33: Replacing the O
2
measuring cell
▸
Disconnect the conductors in the measuring probe inner part and loosen the two
hexagon socket screws holding the holding bolt on the neck tube. Remove the thin,
transparent reference air hose from the feed-through fitting on the analyzer electronics.
▸
Now carefully pull out the inner part of the measuring probe (4-hole ceramics rod with
measuring signal wire, thermoelement and heating)
straight
.
Note:
It is only necessary to replace the measuring cell if it leaks (jumping or incorrect
measured values) and a two-point adjustment was faulty.
WARNING: Risk of burns
The temperature of the 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 measuring probe.
▸
Switch the electronics supply voltage off before removing the measuring probe.
▸
Place the analyzer unit in a safe, protected area after removal and wait until the
measuring probe temperature has cooled down to the ambient temperature.
1
7
3
2
4
6
5
I
III
III
II
II
A
DETAIL A
DETAIL A
A
.
1
Dummy plug
2
Volume reducer
3
O
2
sensor with flange
4
4 M5 x 12 screws
5
Sensor flange seal
6
Measuring probe
7
Measuring probe inner part