Model IR4000S
20
4.4 Calibrating the IR400
You can calibrate the IR400 which is connected to the IR4000S unit in order to make
sure the LEL measurements are accurate. During calibration, the IR400 analog output is
1.5 mA, in order to disable the Alarm and Warn relays.
Equipment required: Calibration cup, tubing, calibration gas tank with regulator.
To Calibrate the IR400 Detector:
1. The IR400 must be in a “no gas” condition initially; it will be zeroed as part of
calibration.
2.
Open the main menu.
Place the magnet on the IR4000S GM logo to move from
normal operation to the main menu options.
3.
Select Automatic Calibration.
Once
AC
appears, remove the magnet.
AC
will flash,
and zeroing will start. When zeroing is complete,
0C
will show on the display to
confirm zero complete, then the display will change to
AC
.
4.
Apply gas to the detector.
Apply a 50% LEL gas using a Gas Check Kit with
portable purge calibrator equipment.
The display will show a steady “
CP
” (Calibration in Progress). If the gas drops below
20% LEL, the display will revert to a flashing ”
CP
”.
In about one to two minutes, depending on gas flow, the IR400 will complete
calibrating and display “
CC
” (Calibration Complete).
5. Remove the gas.
You will continue to see “
CC
” until the gas gets below 5% of full
scale. The unit will then return to normal operation.
If the calibration does not proceed normally, such as if the gas was too low or too late
in getting to the IR400, the IR400 will show a fault (F7).
