Operating instructions
26 OXOR-E · Supplementary Operating Instructions · 8013035 V2.0 · © SICK AG
Maintenance
Subject to change without notice
5.4.2 Exchange procedure behind the front panel
Information
Procedure
WARNING: Health hazards through dangerous gases
If the sample gas could be a risk to health or dangerous:
▸
Thoroughly purge sample gas paths with a neutral gas (e.g. nitrogen) before
opening components carrying sample gas.
CAUTION: Hazards through incorrect assembly
Oxygen sensor and base must be connected gas-tight. Ensure
▸
the sealing ring is intact
▸
sealing surfaces are smooth and free from dust.
Otherwise sample gas can escape during operation and measurements can be
erroneous.
CAUTION: Hazards for the environment
The oxygen sensor contains acid.
▸
Dispose of the spent oxygen sensor in the same manner as a battery.
To simplify fitting: Apply a thin film of high vacuum grease (high quality glass
grease) to the sealing ring of the oxygen sensor. Do not use any other materials
here.
Preparation: 1 Interrupt sample gas feed to the GMS800 (e.g. close valve,
switch pump off).
2 Shut the GMS800 down.
3 If necessary, feed a neutral gas instead of sample gas into the
sample gas path of the GMS800 to flush the sample gas out of
the GMS800 (see warning information).
Removing: 1 Loosen the front panel screws. Now swivel the front panel down-
wards.
2 Remove the oxygen sensor fixing screw.
3 Disconnect the oxygen sensor connection cable (plug connec-
tion).
4 Pull the oxygen sensor out of the base.
Fitting: 1 Inspect the sealing surface in the base; clean when necessary.
2 Carefully insert the new oxygen sensor in the base.
3 Apply locking varnish to the fixing screw thread.
4 Turn the fixing screw in again and tighten “hand tight” to fix the
oxygen sensor in position.
5 Connect the connection cable (plug connection).
Start up: 1 Close the front panel.
2 Recommendation: Carry out a leak tightness check (→ “Series
GMS800” Operating Instructions).
3 Put the GMS800 back into operation.
4 Recommendation: Check that the oxygen sensor functions.
▸
O
2
measured value immediately after restarting with air as
sample gas: → 20 percent by volume (when allowed by
measuring range).
▸
O
2
measured value with O
2
-free sample gas (zero gas, N
2
):
≈ 0percent by volume.
5
Carry out reference point adjustment for measuring component O
2
.