RKI Instruments Digester Gas Monitor User Manual
Page 71
Digester Gas Monitor Operator’s Manual
Performing a Calibration • 65
11. If you want to perform a gas adjustment to complete the calibration, proceed to the
next section, “Performing a Gas Adjustment”.
If you do not want to perform a gas adjustment, use the UP/YES and DOWN/NO
buttons to scroll to EXIT CAL MENU. Press and release the ENTER button to exit
Calibration Mode and return to Standby Mode.
Performing a Gas Adjustment
Performing a gas adjustment sets the response level to calibration gas for the selected
channels. This is also known as a span adjustment.
To perform a gas adjustment for the selected channels, do the following:
1.
Install the demand flow regulator onto the calibration cylinder.
2.
Connect the sample tubing to the demand flow regulator.
3.
Navigate to the Select Operation Screen as described in “Entering Calibration Mode”
on page 62 or proceed to the next step if you just completed an air adjustment and are
at the Select Operation Screen.
4.
Use the UP/YES or DOWN/NO button to display PERFORM GAS ADJUST on the
Select Operation Screen.
5.
Press and release the ENTER button. The Select Channel(s) screen appears.
6.
Use the UP/YES or DOWN/NO button to scroll through the channel combination
choices and select the channel or channels that you will air adjust. In the gas
adjustment example below, channels 1, 2, and 3 have been selected.
7.
Press and release the ENTER button to accept the displayed choice and continue
with the gas adjustment. The display will show the calibration gas concentration that
the Digester Gas Monitor expects you to use for the gas adjustment for the first
selected channel.
8.
Use the UP/YES and DOWN/NO buttons to make the displayed concentration match
the calibration gas concentration, then press and release the ENTER button to accept
it. The display will show the expected calibration gas concentration for the next
selected channel.
Select Operation
PERFORM GAS ADJUST
UP / DN then ENT / ESC
Select Channel(s)
For CAL GAS Adjust
1
UP / DN then ENT / ESC
CHANNEL: 1
CAL Gas To Be Used
METHANE 50 %VOL
UP / DN then ENT / ESC