Technical Reference Manual
Vmax Encore
L2707
3–19
Chapter 3 Maintenance and Troubleshooting
Analyzer Zero Adjustment Matrix
The table below is a quick reference to the adjustment potentiometers, voltmeter lead placements,
voltages and tolerances for the Vmax Systems analyzer zero adjustments.
Note:
Perform Zero adjustments with the sample pump on.
Balloon Pressure Adjustment Procedure
1. Turn on valve L, and then turn on valves G and E.
2. Measure the pressure at the gas port of the two-lumen tube, and adjust the low-pressure
regulator in the pneumatics assembly to 6.3 psi +0.2 psi.
3. Turn valve J on, and then off. The pressure reading should return to the set pressure within
0.2 psi. If it does not, re-adjust the low-pressure regulator to the set pressure, then turn valve
J on and off again, and then re-check the pressure reading. Record the reading as “Reading
1.” After obtaining the set pressure, it should not rise over 7.0 psi.
4. When the reading settles, record the reading as “Reading 2.”
5. Turn off valve L. The pressure should not change by more than 0.6 psi. Record the reading.
6. Turn off Valve G. Measure and record the pressure after 30 seconds at the gas port of the
two-lumen tube. The pressure may not decrease by more than 0.1 psi. Turn off valve E.
7. Turn on valves G and F. Measure and record the pressure at the spirometry port of the two-
lumen tube.
8. Turn valve G off and record the pressure after 30 seconds. The pressure may not decrease
by more than 0.1 psi.
9. Turn on valve K and listen for a rush of gas from the gas supply hose. Turn off valve K.
10. Turn on valves E and G, and wait for the gas port balloon to inflate. Turn valve E off.
11. Turn on valve D for approximately one second, and then turn it off.
12. Ensure that the gas-port balloon valve deflates completely and remains completely deflated
for at least fifteen seconds, and then press
F10.
13. Attach the gas supply hoses to the rear of the pneumatics assembly to be tested.
14. Open the gas supplies and adjust the secondary pressure of DLCO to 80 psi and O
2
to 60
psi. Adjust the secondary pressure of the two CAL gases to 50 psi.
Table 3-1: Analyzer Zero Adjustments
Gas Signal Adjustment + Lead - Lead Voltage Tolerance
CH
4 R20 TP4 AGND 0.00 ± 0.50
CO R38 TP2 AGND 0.00 ± 0.50
CO2 R17 TP3 AGND 0.00 ± 0.50
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