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GAIN LEVEL CHECK (Optional)
It is necessary to complete the alignment
procedure before checking the gain level.
HART or Modbus communication is required to
check the gain.
Procedure
1. Connect the handheld HART communicator
to the receiver module’s 4–20 mA circuit.
2. Turn on the HART communicator and check
for LS2000 device recognition. When HART
communication is established, the LS2000
Online menu will be displayed on the
communicator display.
3. From the Online menu, Navigate to the
Detector Setup menu, then select the Sensor
Setup menu.
4. The following screen will be displayed.
Observe the level indicated for “Gain.”
5. Table 8 can be used as a guideline for new
installations to assess the detector gain level
with proper alignment.
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 LS2000 has a feature that automatically
adjusts transmitter lamp voltage during zero
calibration if the communication link is
connected. (This feature is disabled by default.)
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.
Distance
(meters)
Transmitter Type
Short Range
Long Range
5
1 (Aperture)
20
5 (Aperture)
30
1
2 (Aperture)
40
2-5
5 (Aperture)
60
5-10
1-2
80
2-5
100
2-5
120
5-10
Table 8—Expected Gas Gain Settings for LS2000
Sensor Setup
1) Processing mode
xxxx
2) Interconnect mode
xxxx
3) Log interim beam block Y/N
4) Gain Mode
xxxx
5) Gain
xx
6) Tx lamp voltage
xxxx
7) Auto voltage during cal
E/D
8) Beam block fault time
xxx
Gas Gain number