UEi Test Instruments KM9106/P - Manual (Page 47)

KM9106 Operators Manual 47
Set YES or NO depending on whether auto zero is required or not.
AUTO ZERO ?
NO
Note:
During both Manual and Timed purge operation the following screen will
be displayed for approximately one second every 3 seconds.
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PURGE ON
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Recommended Operation
Each monitoring situation will be different and a degree of user judgement will apply.
The following basic guidelines should be followed :-
• Maximum duration without purge 4 hours followed by 40 minutes purge.
• For monitoring up to 12 hours per day purge should be for 10 minutes every hour.
• For monitoring up to and over 24 hours per day purge should be for 10 minutes
every 30 minutes. This could be a sequence of 5 minutes purge followed by 10
minutes sample.
Sensor Over-range
The main purge will also operate when any gas concentration goes over the stated
range of that sensor. Fresh air will be drawn into the Quintox until the gas level is
down to 80% of the sensor range.