7
4. The sensor (I) is wired to the circuit board. Wires
are connected to the sensor by a pin connector
which can be disconnected by lifting the locking
latch on the connector outwards. The connector
can be lifted off the connector housing which is
located on the circuit board.
5. Unscrew the sensor and remove it.
6. Screw the new sensor in place and re-connect the
pin connector to the connector housing by pushing
it in.
7. Re-attach the back casing to the front casing using
the 4 screws. Take care to feed the battery wires
into their slots in the case.
8. Reconnect the battery and put the battery cover
back in place.
9. Switch on Weld Gas Analyzer to confirm that it is
working properly.
First Aid Procedures:
CAUTION
The electrolyte in the sensor is
caustic, very similar to the
electrolyte in batteries.
If it gets in contact with eyes or skin
it can cause irritation and burning or
stinging.
Wash and rinse affected area with
plenty of water and seek medical
attention if burning persists.
In case of ingestion drink plenty of
cold water, do not induce vomiting
and seek medical attention
immediately.
Troubleshooting
Problem
Possible reason
Solution
No display
Not switched on
Switch on
Batteries dead
Replace batteries
Batteries inserted incorrectly
Lo symbol appears
Low battery
Replace batteries
Turns off during welding
Turns off automatically after 5
minutes of stable readings
Switch on
Zero reading
Sensor disconnected, deposit in jack
plug or sensor jack socket
Rotate sensor whilst in instrument
Not calibrating to 20.9
Sensor exhausted
Replace sensor
Zero reading
Reading drifts
Sensor nearly exhausted
Replace sensor
Sensor in flowing gas too long
Remove sensor from gas flow
Ambient temperature changes
Check ambient temperature
Strong winds
Shield against winds
Inaccurate reading
Old sensor
Replace sensor
Too high flow pressurizes sensor
Reduce gas flow if possible
RF interference
Move away frmo RF source
(e.g. radio)
Condensation on sensor face
Remove condensate
0.1% oxygen levels cannot be
reached
Sensor not calibrated in air
Move calibration wheel in air to
display 20.9
Purge gas is not pure enough
Measure purge gas sample directly
Leak in gas hose
Check gas hose
Pipe is contaminated
Clean pipe from dirt, oil or moisture
Porous purge materials used
Use higher flow rate if purging with
foam, paper or soluble films, use
pure system
