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Operators Manual Model PT2000/H Series Gas Monitor Rev 2. January 2014
Important Note: The LEL sensor can only be calibrated with 50% LEL and
unlike in case of H2S and other toxic sensors this value cannot be changed
during calibration
7.
The microprocessor waits 60 seconds for the user to apply the calibration gas while
flashing the display approximately twice every second. Attach the calibration
adapter to the sensor head assembly and turn the gas on. When the flow of the gas
is detected by the sensor the display flashing rate will slow down to once every
second. If no gas is detected within 60 seconds the sensor aborts calibration and
before returning
to normal operation..
8.
Apply the calibration gas for about 2 minutes.
9.
After 2 minutes the sensor will display
Adjustng
for 5 to 15 seconds while making
adjustments and recording the calibration data into memory. When completed the
display will starts flashing rapidly. At this time remove the calibration gas and allow
the sensor to clear.
Do not remove the calibration gas while the sensor is adjusting.
Remove the gas only when Calibration OK message is displayed.
10.
is displayed for few seconds.
11.
The sensor will return to normal operation once all the calibration gas is cleared
out of the sensor head and the reading goes to zero.
Also refer to
Recommended Calibration Gas for Target Sensor
Target Gas
Recommended Calibration gas
LEL Combustibles
50% LEL (2.5% Methane in air)
Hydrogen Sulfide
50 ppm H2S Balanced in Air
Carbon Monoxide
50 ppm CO balanced in Air
Sulfur Dioxide
25 ppm SO2 Balanced in Air
Oxygen Deficiency
Pure Nitrogen (for zeroing)
Hydrogen
100 ppm Hydrogen balanced in Air
