118 • Using Maintenance Mode
Gas Tracer Operator’s Manual, CSA Version
22. If you have a 5 sensor unit and wish to calibrate the %volume sensor, go back
to step 1 and repeat the process selecting the %volume calibration value screen
in step 16 and using a %volume methane cylinder.
If you are finished calibrating, use the (SHIFT)
▼
button to navigate to the
NORMAL
menu item, then press and release the POWER ENTER button to
return to Measuring Mode.
Calibrating Using Single Calibration
If CL EXPRD is set to NOT USE and calibration becomes due, then the unit must
be calibrated using this menu item and/or the previous menu item, AUTO CAL
because it will not be possible to enter normal operation. See “Calibration/Bump
Test Supplies and Equipment” on page 62 for the items you will need to perform a
calibration.
The procedure below describes a span adjustment of one channel using a
calibration kit that includes a 3-gas calibration cylinder, a 0.5 LPM (liters per
minute) regulator, and non-absorbent sample tubing. The standard 3-gas cylinder
consists of 50% LEL methane, 12% oxygen, 50 ppm CO, and a balance of nitrogen.
In the example below, the CH
4
channel’s span is adjusted. See “Parts List” on
page 173 for available calibration kits and calibration kit spare parts.
Calibration cylinders that contain only one target gas may also be used for single
calibration. For channels other than oxygen, RKI Instruments, Inc. recommends
that you use a cylinder that contains a concentration of 10-50% of the full scale
value of the target gas. For example, if you are calibrating the combustible gas
channel, your calibration cylinder should have a combustible gas concentration
between 10% LEL and 50% LEL. For the oxygen channel, RKI Instruments, Inc.
recommends using 100% nitrogen to perform the adjustment but any
concentration between 0% oxygen (100% nitrogen) and 17% oxygen can be used
to make the adjustment.
NOTE:
If your combustible gas channel is calibrated to a gas other than
methane, use an appropriate gas cylinder to perform the calibration.
1. Perform a fresh air adjust. See “Performing a Fresh Air Adjustment” on
page 114 for instructions.
2. Install the demand flow regulator onto the calibration cylinder.
3. Connect the sample tubing to the demand flow regulator.
4. Install the hose and probe to the Gas Tracer.
5. Use the AIR
▲
or (SHIFT)
▼
buttons to scroll to the ONE CAL menu option.
MAINTENANCE
ONE CAL
