Teledyne API Model 200AH NO
X
Analyzer Instruction Manual, 06492, Rev. G2
7-8
Table 7-7: 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 M200AH 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.
