INDUSTRIAL FIXED GAS DETECTOR, FD-60
FORENSICS DETECTORS
TM
FORENSICS DETECTORS
TM
www.forensicsdetectors.com
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5.3. “ALARM SET” Menu
Users can use this option to set the warning value and alarm mode. The detector is
equipped with two alarm point settings. The alarm modes are LOW alarm and HIGH
alarm values. The corresponding two sets of relays are triggered/switched. The
instrument is in a LOW alarm state when the detected concentration is higher than
the set LOW detected concentration value. The instrument is in a HIGH alarm state
when the detected concentration is higher than the set concentration value. Before
leaving the factory, the alarm value has been set. Please check the default settings to
ensure they meet your local or preferred exposure alarm levels.
•
The LOW alarm, corresponds to the first set of relay output (COM1 NO1, NC1)
on the detector main board.
•
The HIGH alarm, the second set of relay output (COM2, NO2, NC2)
corresponds to the detector main board.
•
The Relay (30VDC 2A/220VAC 2A) COM and NO are normally open, COM and
NC are normally closed.
5.4. Gas Zero
Sometimes the gas sensor drifts due to electronics and sensor degradation.
Sometimes, the sensor does not return back to its ZERO baseline. Also sometimes, the
sensor is exposed to HIGH concentrations of toxic gas and the sensor may be
permanently “poisoned”. Please ensure fresh air is exposed to the sensor for at least
30 minutes, before making this determination. If the zero drift of the sensor is
unacceptable, the user can perform a ZERO calibration operation. Pass pure nitrogen
or clean air for at least 2 minutes through the sensor. Click on the “3. Gas Zero” menu.
Enter into the menu items by selecting your gas then press SAVE after exposure to
fresh air or pure nitrogen and a stable reading has been achieved. Please note, if you
have a OXYGEN or CARBON DIOXIDE sensor, you will need to use Pure Nitrogen to
achieve a ZERO Calibration. Other toxic gases will suffice by exposing the detector to
fresh air.
5.5. Gas Check / SPAN CALIBRATION
Only perform calibration is you are an experience technician. Otherwise please contact
the manufacturer for instructions. We have special calibration cap fittings to
undertake precise calibration with (in/out) tube ports.
5.6. AlarmData
The detector can save 1000 alarm records. The interface can view the maximum
alarm concentration in the environment recorded in the "detection interface", as well
as the time point and alarm state of the highest concentration.
