Teledyne API Model 200AH NO
X
Analyzer Instruction Manual, 06492, Rev. G2
9-63
9.3.9. Z/S Valves
The Z/S Valves is an option in the instrument. Before troubleshooting this sub-assembly, check
that the options were ordered, and that they are enabled in the software. Section 7.2 shows how
the Z/S valve option should be set-up.
Check for the Z/S valves.
Check for the physical presence of the valves. See
1. Figure 2-6 for Z/S Valve location.
2. Check that the option has been enabled in the software. The front panel display, when the
instrument is in SAMPLE mode, should display CALS and CALZ buttons on the second line
of the display. The presence of the buttons indicates that the option has been enabled in
software. If the valves are present but CALS/CALZ is not displayed, call the factory.
Troubleshooting the Z/S valves.
1. Turn the instrument and sample pump on. Locate the valve module on the rear panel.
2. There is a red LED associated with each of the 4 valve positions, when the LED is ON the
valve is OPEN. Each LED corresponds top-to-bottom to each valve.
3. Correct operation of each valve can be checked as follows:
A. In sample mode, the bottom sample valve is open and the LED is ON. Check flow through
the sample inlet port on the rear panel.
B. In CALZ mode, the second from the bottom zero gas valve is open and the LED is ON.
Check flow through the zero gas port on the rear panel.
C. In CALS - LOW SPAN mode, the third from the bottom span gas valve is open and the
corresponding LED is ON. Check flow through the low span gas port on the rear panel.
D. In CALS - HI SPAN mode, the top gas valve is open and the top LED is ON. Check flow
through the high span gas port on the rear panel.
If the LED’s fail to light, check the iSBX board on the CPU board and cable for 0-5 VDC logic
signals.
If the LED’s light, but the valves do not operate, check the 12 VDC cable from the power supply
module.
The valve may be operating, but may be plugged. If that is suspected, dis-assemble the manifold
and inspect for signs of plugging. While the valves can be removed from the manifold, it is NOT
recommended that the valves be dis-assembled as there are several small spring loaded parts
inside.
