21
FINAL TESTS
At this point, the system should have
all settings programmed and it
should be monitoring in the Auto
sample mode. There are four stages
to the final checks: Correct Monitor
Sequencing, Correct Integration with
External
devices,
Response
to
Refrigerant and End-to-End System
Test
Monitor Sequencing
Watch the unit as it measures the
sample area. Make certain that it
periodically switches from the Auto
sample mode to the Auto zero mode,
and back again. Make a note of the
ppm reading in the sample area.
The reading should be zero. It may
periodically measure a transient level
of between 10 and 15 ppm, but it
should never stay above 10 ppm if
no leak is present. If the reading is
consistently higher than 10 ppm, or if
it enters alarm, it is likely there is a
leak present. A high reading may
also result from the recent use of a
chlorinated cleaning agent. Many
industrial degreasers use chlorine
based
organic
compounds.
Examples are trichloroethylene, or
perchloroethylene. If there is no leak
and there are no other sources of
halogen vapors in the room, contact
SenTech technical support.
Integration with External Devices
Once a monitor has been connected
to external alarms, fans and building
systems, integration can be checked
using the Alarm test function of the
monitor. The Alarm test screen is
found in the System Setup menus
described previously in the start up
and programming section of this
manual.
The setup menu is accessed by
pressing the “ENT” key. Press the
“4” key to enter setup, followed by
the password “999”. From the setup
menu, press the “3” key to enter
system setup. From the System
setup menu, press the “3” key to
enter the alarm test screen.
Key selections 1, 2, and 3 are used
to energize the Low, Main and High
alarm relays respectively. Key
selection 4 will initiate a cycle that
turns on the low relay, then the main
relay, then the high relay, until all
three relays are energized. If any
relay has been energized, the fourth
line of the display will change to
instruct the user to press the
“RESET” key to de-energize the
relays.
With the alarm relays energized,
confirm that the monitor is correctly
Alarm Test
1)…Low 2)…Main
3)…HIGH 4)…All
Press Key To Test
Alarm Test
1)…Low 2)…Main
3)…HIGH 4)…All
RESET To Clear
Summary of Contents for IR-SNIF-1
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