Table 2-1. Proof Test for Ultima X Series Gas Detectors
TEST EXPECTED OUTCOME
1.
Bypass the safety function or take None
appropriate action to avoid a false trip.
Note that calibration output signal must
be disabled so the analog output can
be measured during the test.
2.
Perform a zero and span calibration as Analog output should read 4mA when zero
defined in the regular calibration section gas is connected. Analog output should be
of the Ultima X Series Gas Monitor scaled between 4 mA and 20 mA when span
instruction manual. While performing gas is applied. Exact analog output value
calibration, measure the analog output depends on span gas concentration. (e.g., if
when the device has zero gas or span span gas concentration is 50% LEL,
gas connected. If alarm relays are used, analog output should be 12 mA
check relay output
Reaction of external relays varies, based on
configuration. See TABLE 2-2 for detailed
relay reaction based on configuration. Any
activated relays should remain activated when
gas is removed if they are configured to latch;
otherwise,. relays deactivate when gas
is removed
If calibration is successful, the display shows
“END” after the zero and the span
calibration steps
3.
If using alarm relays, and any alarm Relay should activate when span gas is
relay did not activate in the step 2 applied. When span gas is removed, alarm
because the alarm setpoint was higher should remain active if it is configured
than the span gas concentration, the to latch; otherwise, it should become inactive
relay should be activated in this test.
Change the setpoint for any such alarms
to a value just below the span gas
concentration. Now apply the span gas
as it was done during calibration
4.
Remove the span gas When span gas is removed, the alarm should
remain active if it is configured to latch;
otherwise, it should become inactive
5.
Change the setpoint back to the None
desired value
6.
Remove the bypass or otherwise None
reverse the action taken in step 1
2-4
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