SenTech IR-SNIF-1, Инструкция по установке и эксплуатации

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integrated into the building systems.
Once this test has been completed,
press the “ABORT” key. The
monitor will restore any alarms that
existed prior to entering this test
mode, and will return to the system
setup screen. Press the “ABORT”
key again to return to normal
operation.
Response to Refrigerant
After checking the alarms, the next
step is to check for a proper
response to the presence of a
refrigerant. This will be done by
preparing a sample of refrigerant for
testing, and then presenting it to the
system to make certain it measures
refrigerant. It is suggested the
following
steps are completely
reviewed before starting. This test is
best done after the monitor has been
running normally for an hour or two.
Step 1: Remove the inlet tubing
from the sample inlet.
Step 2: Prepare a refrigerant
sample. Note that refrigerants can
be
Chlorofluorcarbons (CFC's),
Hydrochlorofluorocarbons (HCFC's)
or
Hydrofluorocarbons (HFC's).
HFC's are the only refrigerants
considered to be truly "Ozone
Friendly". Because of this, SenTech
Corporation recommends use of an
HFC, such as R134A for field-testing
of the IR-SNIF series of monitors.
Any field-testing of a refrigerant
monitor, by its very nature, will
release an amount of refrigerant into
the environment through the exhaust
port of the monitor.
Caution: Follow all national
and local codes for safe
handling of refrigerants.
Because the IR-SNIF-1,2,3 is factory
calibrated, and no field calibration is
necessary, the refrigerant sample is
not required to be of a known level.
A calibrated "test gas" kit is available
from SenTech Corporation, should
the user desire to perform the
following tests with a sample of
known PPM level. The following
paragraphs describe a procedure for
preparation of a refrigerant sample
using pure refrigerant.
Three items are needed to prepare a
sample:
A Refrigerant
A Container
A short piece of 1/4" Tube.
The Refrigerant should be available
on-site, but if not, R-134A is readily
available at local stores. Note that
many local office supply stores sell a
'pressurized air duster'. Often, this
product
is simply pressurized
Tetrafluoroethane, or R-134A. This
is a cost effective, readily available
source of pure test gas, as long as
the contents have been verified to be
Tetrafluoroethane.
The sample container may also be
available on-site. Suitable sample
containers range from lab quality
sealed bags with twist valves to a
simple plastic bag or even an open
top jar or can. The container should
be at least 4 liters, or about a gallon.
The container should be able to be
loosely closed, e.g. twisting a plastic
bag, or closing a lid.