27 95-87142.2
6. Verify the gain setting. The gas gain setting
options are 1, 2, 5, 10, 20, 50 and 100; ideal
gain settings are 2, 5, and 10.
A gain of 1 indicates that the system may be
near saturation (signal strength is too high).
If the gas gain number = 1 and the Active
avg or Ref avg numbers are greater than
1500, use the aperture kit to reduce signal.
See the Transmitter Lamp Voltage section for
additional signal strength reduction options
as needed. If using the Long range receiver,
it may be necessary to switch to the Short
range version.
A gain of 20 or greater indicates that the
system signal strength is less than expected.
Ensure that the system has a clear beam
path, clean windows, and was properly
aligned and calibrated in clear weather. See
the Transmitter Lamp Voltage section for
additional signal strength increase options
as needed. If using the Short range receiver,
it may be necessary to switch to the Long
range version.
Contact the factory for further information or
assistance.
In all cases, a green LED and 4 mA output
indicate that the unit will properly perform its
safety function. Gain adjustments and checks
are simply a way to optimize the system so
that it will perform in the widest variety of
application scenarios (e.g. shifting mounts,
inclement weather, mechanical impact, lens
obscuration, etc.).
TRANSMITTER LAMP VOLTAGE
The transmitter lamp voltage is adjusted
automatically during zero calibration if the
communication link is connected. Alternatively,
lamp voltage can be adjusted via HART or
MODBUS communication directly to the
transmitter. The transmitter lamp voltage should
be lowered to reduce signal at the receiver.
Transmitter lamp voltage should be raised to
increase signal at the Receiver. The adjustment
range for the transmitter lamp is 400-950 V
(default = 750 V). Contact the factory for further
information or assistance.
calibRation
CALIBRATION OVERVIEW
Span calibration is not required. The LS2000
supports non-intrusive field zero calibration,
although routine calibration is normally not
required.
ZERO CALIBRATION
Zero Calibration is a one-step process consisting
of clean air (zero) condition adjustment only,
which is performed automatically by the
device. This procedure adjusts the “clean
air” signal output only, and is normally used
if the gas output signal level has drifted. The
cause of drift is typically due to the presence of
background gas during calibration. Additionally,
the zero calibration procedure will optimize
the transmitter lamp output intensity if the
optional communication link is installed. This is
useful for situations where the signal strength
at the receiver is too large (saturation) or too
small. Ensure that the optical path is clear of
hydrocarbons prior to calibration initiation to
ensure an accurate zero (clean air) condition.
IMPORTANT CALIBRATION NOTES
NOTE
Ensure that the detector has been
operating for at least two hours before
calibrating.
NOTE
Always ensure that the LS2000 optics
are totally free of all hydrocarbons before
initiating calibration.
NOTE
Zero calibration cannot be performed if
the detector is improperly aligned. When
correct alignment is achieved, the sensor
ratio (active vs. reference signals) should
be between 0.8 and 1.3. To check the ratio,
connect a HART handheld and navigate to:
Main > Detector Status > Sensor Info > Ratio
An out-of-tolerance ratio value typically
indicates incorrect alignment or presence
of background gas.
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