Specifications

4-42 A5E31405710001
Use of Analytical Module Hardware Test Box, continued
Step Procedure
3. VALVE 1 pressurizes the control ports for the Model 50
valve(s).
Turn VALVE 1 to ON. Wait about 5 seconds for the pressure
to stabilize.
4. Set MAIN VALVE to BLOCK. This isolates the pressurized
ports.
5. Allow the test to sit for about 1 minute. There should be no
pressure drop over this time. If a leak is present, use a leak
detector to find the source. Note that there may be more
than one leak.
6. After VALVE 1 leak test is complete, turn MAIN VALVE to
VENT.
7. When pressure has dissipated, turn VALVE 1 to OFF.
8. VALVE 2 pressurizes the reference path(s) for the module,
which are already blocked off on the vent side of the
module.
Repeat steps 2-7 for VALVE 2.
9. VALVE 3 pressurizes all ports in the Model 50 valve.
Repeat steps 2-7 for VALVE 3, with the following
differences.
With VALVE 3 allow 30 seconds for pressure to stabilize
before setting the MAIN VALVE to BLOCK and allow 3-5
minutes wait time to determine if there is any pressure loss.
10. After leak test, the gas supply can be shut off and
disconnected and the vent line can be retracted.