Gas tester (part no. 343265)
Gastester is an exhaust gas analyzer that works on the “Hot Wire” or “Thermal Conductivity princip-
le. According to this principle, the thermal conductivity of exhaust gas varies in proportion to the
amount of carbon monoxide present.
CO Function, Calibrated range: 0-10% CO (indicates uncalibrated to 20% C)
Accuracy: +/- 0.5% CO Typical (Throughout the indicated range 0.5% CO to 6.5% CO)
1) Connection pump to body
2) Connection to the exhaust probe
3) Water drain pipe
4) Two core cable (to 12V battery)
5) Calibration control
1. Descriptions & Controls DISPLAY
This is calibrated in volume percent carbon monoxide (CO %)
CALIBRATION CONTROL.
This is used to set the reading of the display to show 2.0% at the start of the tests, before the probe
is inserted into the exhaust pipe. (NB: The calibrate position represents what the instrument should
register when the probe is in the air. It is coincidental that air should measure the same as exhaust
gas with 2% CO). When the probe is subsequently inserted into the exhaust pipe, the display of
the instrument may increase or fall from the calibrate condition. TWO CORE CABLE WITH CLIPS (for
connecting to the car battery) EXHAUST PROBE. The metal pipe is for insertion into the exhaust pipe
and is retained in position by the metal springs which press against the inside of the exhaust pipe.
NB In use the pipe from the exhaust probe should slope down continuously to the Pulse Pump/Wa-
ter Trap so that water runs down and may be automatically expelled from the drain pipe.
2. Preparations before use
Any service maintenance such as air filter renewal, tappet adjustment, carburetor maintenance,
ignition maintenance including ignition timing, should be carried out before setting the carburetor or fuel
injection mixture adjustment. Petrol mixture setting should be the FINAL ADJUSTMENT in any engine tun-
ing work. Carbon monoxide is an EXTREMELY POISONOUS gas and any work on the car with the engine
running should therefore be carried out in the open air. Take care not to breathe in gases when using the
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