Teledyne 9110AH - Nitrogen oxides analyzer User Manual
Page 94
TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
7-6
7.2 Manual Zero/Span Check with Zero/Span Valves Option
The Zero/Span valve option can be operated from the front panel keyboard as described below.
The Zero/Span valves allow zero and span gas come in through ports on the rear panel of the
instrument. The Zero/Span valves can be set up to operate automatically on a periodic schedule.
See Section 6.2 to setup automatic zero/span feature.
Table 7-5: Manual Zero Check Procedure - Z/S Valves
Step Number
Action
Comment
1.
Check “Before
Calibration”
Check “Before Calibration” Section 7 before proceeding.
2.
Press CALZ
The analyzer enters the zero calibrate mode. This switches the
sample/cal and zero valve to allow zero gas to come in
through the zero gas inlet port in the rear panel.
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,
forcing the reading to zero.
7.
Press EXIT
M9110AH returns to sample mode. Immediately after
calibration, readings do not go into the DAS averages.
Refer to Table 7-3 to enter expected NO and NO
x
values.