Honeywell RAEGuard Lite - Page 13

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point (it can be at one end of the controller or detector, but not at the same time). By default,
a resistance of 270 ohm (RL) is connected between the detector terminals. Before
connecting with the controller, remove the resistor.
If the RAEGuard Lite transmitter you purchase supports the HART function, connect it to the
HART terminal by referring to the following figure:
5.2) Terminals
Note: When wiring, open the top cover of the detector in advance and pull out the circuit
modules such as the display and the mainboard.
5.3) Cable connection
Note: All cables or connections on the transmitter must be sealed with certified plugs or
glands!
Industrial grade armored cables are recommended for RAEGuard Lite connection cables.
RAEGuard Lite gas detector needs the power supply between 16VDC and 32VDC provided
by the controller or upper system. For the cable connection distance, please read the “User’s
Terminal
Identification
Definition
Remarks
A
+24V
+VE Supply (16-32VDC)
Controller
4-20mA
4-20mA current&HART output
GND
-VE Supply
RS485A/+
MODBUS A(+)
MODBUS
RTU
RS485B/-
MODBUS B(-)
B
LOW ALARM-NO
Low alarm - Normally Open
Note: If the
function
is not
purchased
at the time
of ordering,
there is no
terminal.
LOW ALARM-COM
Low alarm - Common
LOW ALARM-NC
Low alarm - Normally Closed
HIGH ALARM-NO
High alarm - Normally Open
HIGH ALARM-COM
High alarm – Common
HIGH ALARM-NC
High alarm - Normally Closed
FAULT ALARM-NO
Fault - Normally Open
FAULT ALARM-COM
Fault – Common
FAULT ALARM-NC
Fault - Normally Closed
C
ALARM
External SP-07PLUS
Optional
D
SENSOR
Connect with sensor
Host
computer or
controller
HART
Terminal
250Ω
+24VDC
4-20mA
GND
5