Calibration | 5-7
Remote Calibrate/Remote Verify
To initiate a remote calibration or verification, do the following:
1. Enter the calibration gas values to match the span and zero calibration
gas cylinders you intend to use to calibrate/verify your system. These
values are referred to in this section as setpoint values.
2. Select Initiate Cal or Initiate Verify from the Calibrate key menu, de-
pending on whether you want to perform a calibration or verication.
3. Select Remote Calibrate or Remote Verify.
The following appears on your display (display line 2 will only appear if
you have the combustibles option; display line 3 will only appear if you
have the methane option):
O2 xx.x % Set xx.x %
Cmb y
CH4 z
Press ENTER to Span
4. Press Enter when the O
2
reading on the far left of the rst display line
stabilizes. The reading on the far right of the rst display line shows the
setpoint value you entered using the Cal Gas Values menu option. This
setpoint value should match the cal gas cylinder value.
If your O
2
reading on the far left of the display has stabilized, yet is not near the setpoint
value on the far right of the display, you should check the cal gas value you entered and
ensure that this value matches the cal gas cylinder for that gas in the RCU.
When performing a primary calibration or the first calibration after a
primary calibration, the reading and the setpoint values often won’t
match. Once the first regular calibration after a primary calibration is
performed, the readings should match.
You are then prompted to calibrate the zero gases:
O2 xx.x % Set xx.x %
Cmb yyyy Set 0
CH4 zzzz Set 0
Press ENTER to Zero
5. Press Enter when the zero gas reading(s) on the left of the display stabi-
lizes. If you don’t have the combustibles option, you only need to wait until
the O
2
zero gas value stabilizes. If you have the combustibles option, wait
until all readings stabilize. The reading on the far right of the rst display
line shows the setpoint value you entered for the O
2
zero gas using the Cal
Gas Values menu option. This O
2
zero gas setpoint value should match
the cal gas cylinder for the O
2
zero gas connected to your RCU.
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