Turn the monitor on in diagnostic mode and go to the “Lamp = xxx, Fail
= yyy +/-” display. (“xxx” is the lamp current reading; “yyy” is the value
of the lamp failure threshold.)
Decrease the “yyy” value until it is about 10 counts below the “xxx”
Then press [Y/+] to save changes, or press [N/-] to discard changes.
The type of battery (Lithium-Ion battery pack or alkaline battery
adapter) used to charge the monitor is displayed. Some toxic gas
sensors require a bias voltage of a few hundred millivolts for the sensor
to function properly. These include NO and NH
To manually switch the bias voltage supply on,
Voltage for Toxic Sensors on page 35
Install a biased sensor in the TOX1 socket. If the bias voltage is
switched on, the bias reading should be below 182, otherwise it may
Show x1 and x10 Range of PID Sensor
The PID sensor is connected to two amplifiers with two different gains:
unity gain and gain of ten; these are the raw outputs of both amplifiers.
When fresh air is applied, both amplifier outputs should be 200 to 500.
When a VOC gas is applied, both amplifier outputs should increase;
the amount of increase for the unity gain (x1) should be 1/10 of the
increase for the gain of ten (x10). If the increase does not agree with the
expected value, then the gain switch of the amplifier may be defective.
Press [Y/+] to increase the contrast and [N/-] to decrease the contrast.
The LCD contrast bar indicates the current setting. If the display
appears to have dark lines, press [Y/+] a few times to see the display
In extreme temperatures, the display may fade or
The top line indicates the instantaneous reading of raw counts from the
LEL sensor. The bottom line shows if the LEL sensor is on or off. Press
[N/-] to turn the power off, and press [Y/+] to turn the power on.
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