Page 507 - Med Plaza and Cancer Center

4/TEST PROCEDURES

Test Procedure-Gas Modules 13. Reset (see below) and retest switch gauge if necessary.

1. Oxygen cylinder should have at least 500 psi To reset the trigger point: Insert a 1/16 hex wrench
pressure. into the right (high alarm) adjustment screw on the
face of the switch gauge. Set the alarm contact to the
2. Disable audio alarm by taping down the Alarm Silence desired trigger point. Retest the switch gauge.
button.
14. Verify that the pressure readings on the switch gauge
3. Remove front panel (follow procedure in Section 6.1). and the pressure gauge are within:

4. Disconnect the ribbon cable from the power supply 6 psig for 50 psi gases
board. 18 psig for 180 psi gases

5. Attach the extender cable to the terminals on the If not, determine which gauge is faulty (using the test
control/display board and the power supply board apparatus) and replace the faulty gauge.
where the ribbon cable was attached.
15. Slowly decrease small regulator pressure setting until
6. Attach a ground conductor from a common ground on low pressure alarm is activated. The alarm pressure
the front panel to the rough-in assembly. Six feet of gauge should indicate with in the specification
No. 18 stranded wire with an alligator clip on each contained in Section 2.4 and the test gauge should be
end is recommended. within ± 2 psi of the desired alarm point:

7. Attach pressure hose from the Variable Pressure O , N O, AIR 40 psi
2
2
Fixture to the module to be tested. N 160 psi
2
8. Turn adjusting screws on both regulators 16. Reset and retest switch gauge, if necessary.
counterclockwise until the spring tension is completely
released. To reset the trigger point: Insert a 1/16 hex wrench
into the left (low alarm) adjustment screw on the face
9. Turn oxygen cylinder ON. of the switch gauge. Set the alarm contact to the
desired trigger point. Retest the switch gauge.
10. Adjust large regulator to 35 psi more than the
nominal line pressure of module to be tested. 17. Verify that the pressure readings on the switch gauge
and the pressure gauge are within:
11. Adjust small regulator until pressure gauge in alarm
module indicates nominal line pressure. 6 psig for 50 psi gases
18 psig for 180 psi gases
12. While observing the Abnormal light, slowly adjust
small regulator until the high pressure alarm activates. If not, determine which gauge is faulty (using the test
The alarm pressure gauge should indicate within the apparatus) and replace the faulty gauge.
specification contained in Section 2.4 and the test
gauge should be within ± 2 psi of the desired alarm
point:
O , N O, AIR 60 psi
2 2
N 200 psi
2

4-4 0178-0135-000 Rev. A