Important Operation Notes
Please read and follow all of the cautions contained in the Safety Warnings section on page
45 of this manual.
Air-to-Fuel Ratio Sensors
Read the AFR Measurement Calibration (“AIR CAL”) section on page 22.
Do not use the air-to-fuel ratio (AFR) sensors with leaded fuel or in a heavily sooting or
crankcase oil burning engine because these conditions can shorten the life of the sensors.
Do not operate an engine for more than three minutes with the AFR sensors installed in the
exhaust if the AFRecorder is off, or if the AFR measurement function is disabled (see AFR
Measurement Enable/Disable on page 23), or if the supply voltage is less than 11 VDC
(Model 4800P only).
Only connect or disconnect the AFR sensors from the AFRecorder when the AFRecorder is
off or if the AFR measurement function is disabled.
Do not mount the AFR sensors where liquid fuel or condensed water will collect on the
sensors' tips.
To minimize thermal shock to the AFR sensors caused by condensed water, operate the
engine for approximately one minute before turning on the AFRecorder and leave the
AFRecorder on for approximately two minutes after stopping the engine. This suggestion
can be ignored for cold-start studies. If leaded fuel is used (which is not recommended), then
the AFRecorder should be on before the engine is started.
Do not use the AFR sensors where exhaust gas temperatures or pressures exceed the
specified ranges. (See the Input Specifications and Limits section on page 34.)
Do not allow the AFR sensors' sealing rubber (where the wires come out of the sensors) to
exceed 200 deg. C.
Do not drop the AFR sensors onto a hard surface.
The AFR sensors are self-heated. Do not touch or expose them to flammable substances
when the AFRecorder is on.
Before installing the AFR sensors, apply a small amount of non-lead containing antiseize
compound to their threads. Do not get the compound on the sensors' tips.
Route and cable-tie the AFR sensors' cables away from hot or moving objects and ignition
wires.
Important Operation Notes 5
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