5
95-8714
6.3
OPERATION
INTERNAL MAGNETIC SWITCH /
CALIBRATION LINE TERMINAL
An internal magnetic switch is provided for
resetting latched alarms and initiating field zero
calibration. See Figure 2 for switch location. The
same functions can be accomplished remotely
by installing a switch (momentary closure)
between the CAL and 0V COM terminals on
the LS20 0 0 receiver. Momentary switch
activation will reset alarms, while holding the
switch closed for three seconds or longer (not
to exceed 30 seconds) will start the calibration
sequence. The LEDs will begin flashing green
(5 Hz) when the reset criteria have been met and
will change to flashing yellow (5 Hz) when the
calibration period has been met (>3 seconds,
<30 seconds). The device will reset if the switch
is released during a flashing green LED and will
enter calibration if the switch is released during a
flashing yellow LED.
MODULE IDENTIFICATION
See Figure 3 for identification of the transmitter
and receiver modules. The functional and
electrical characteristic differences of the two
devices are described in Table 2.
FACTORY RESET COMMAND
The LS2000 provides a factory reset command
that sets all user configurable parameters back
to their default settings. This command can be
accessed via HART or Modbus communication.
PLACE CALIBRATION MAGNET HERE
TO ACTIVATE INTERNAL REED SWITCH
A2648
Figure 2—Location of Internal Magnetic Switch
on Receiver Module
Table 2—Functional and Electrical Comparison of Transmitter and Receiver
Characteristic
Transmitter
Receiver
Functional Description
Contains a xenon flash lamp,
and generates optical energy to
enable hydrocarbon detection.
Contains opto-electronics, signal processing,
output drivers, and diagnostic electronics.
Electrical Connections
Connections for power, HART,
RS-485, Communication Link.
Connections for power, 4–20 mA, HART,
RS-485, relay contacts (optional), LON
communication, Communication Link, and
calibration/reset.
Onboard LED Indicators
Indicates device status.
Green indicates normal
operation.
Yellow indicates fault condition.
When the Communication Link
is used, the transmitter LED
operation matches receiver
LED operation, including alarm
status.
Indicates normal, alarm, fault, and calibration
status.
Green indicates normal operation. Blinking red
indicates low gas alarm condition.
Steady red indicates high gas alarm condition.
Yellow indicates system fault. See
Tables 4 and
5 for details.
LED operation for fault status is non-latching.
LED operation for gas alarms is configurable
for latching/non-latching.
Magnetic Calibration
Switch (See Figure 2 for
switch location.)
NA
Momentary activation provides reset function
for latched alarm outputs. Activation for longer
than 3 seconds will initiate zero calibration.
Adjustable Settings
Programmable IR signal intensity
and heater operation. HART
or Modbus communication is
required to change the factory
default settings.
Factory calibrated for methane, propane, and
butane, 0-5 LFL-meters full scale. Default gas
depends on model. See Table 3 for receiver
factory default settings. HART, Modbus, or
LON communication is required to change the
factory default settings.