Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 91)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
7-3
7.1 Manual Zero/Span Check or Cal With Zero/Span Gas in
the Sample Port
The calibration of the instrument can be checked or adjusted using gas coming in the sample
port. This method is often used when the calibration gas is supplied from the stack sample
probe or external tank and valve system. This is the calibration method to use if the instrument
is purchased without the Zero/Span Valve option.
Table 7-2 details the zero calibration procedure with zero gas coming in through the sample
port.
Table 7-2: Manual Zero Calibration Procedure - Zero Gas Thru Sample Port
Step Number Action Comment
1. Check “Before
Calibration” Check “Before Calibration” Section 7 above before
proceeding.
2. Press CAL The M9110AH enters the calibrate mode from sample mode.
The zero gas must come in through the sample port.
3. Select LO or HI
Range If AutoRange is enabled you will be prompted for which
range to calibrate. Select the LO or Hi range, then press
ENTR.
4. Wait 10 min Wait for reading to stabilize at zero value.
5. Press ZERO If you change your mind after pressing ZERO, you can still
press EXIT here without zeroing the instrument.
6. Press ENTR Pressing ENTR actually changes the calculation equations.
7. Press EXIT M9110AH returns to sampling. Immediately after calibration,
data is not added to the DAS averages.