ENMET ISA-RAL-M - Manual (Page 12)

ENMET Corporation ISA-RAL-M, ISA-RAH-M
8
5.1 Quick Field Tests
To verify the instrument's response capability:
Use a cylinder of high-level CO/air mixture (i.e., 200 ppm CO for a 20 ppm calibrated unit) with a quick-disconnect
gas fixture.
1a. Remove the compressed air line and insert the test gas.
2a. Let a little gas flow over the sensor. You may need to adjust the regulator.
3a. Meter should move up-scale in less than 20 seconds and read full-scale within one minute.
OR
1b. Unscrew the sensor head assembly.
2b. Give the sensor a quick exposure to a bottle cap from an alcohol solution.
N OTE : Alcohol is heavier than air. Hold the cap over the sensor so vapors float down over it. Purge the sensor
after this test.
Whenever you use a test gas containing a level of gas greater than the high alarm level, the meter swings up-scale,
green power light goes out, amber and red alarm lights go on and relay contacts close to trigger remote alarms.
This test is to verify response capability. If it does not bring the unit into alarm, contact ENMET personnel.
C AUTION : Do not repeatedly blow smoke on the exposed sensor heat. Do not squirt pure gases or liquid
hydrocarbons (butane, propane, gasoline etc.) directly on the sensor.
Figure 7: Calibration Adapter and Gas
Metallic Oxide
Semiconductor
Sensor
Hydrocarbon Filter
Humidifier
(Fill to Upper Water Level mark)
Pressure
Regulator
Quick Release
Fittings
Metering Orifice
ENMET Calibration Gas
(CO in Air)
Calibration Adapter