Det-Tronics OPECL Infrared Hydrocarbon Gas Detector - Manual (Page 8)

6 95-8556 10.1
SpEcificationS
INPUT VOLTAGE (Both Modules)—
24 Vdc nominal. Operating range is 18 to 30 Vdc.
Ripple cannot exceed 0.5 volts P-P.
POWER CONSUMPTION (Per Module)—
Transmitter
5.0 watts nominal @ 24 Vdc, 6.9 watts @ 30 Vdc.
5.8 watts peak @ 24 Vdc, 7.5 watts peak @ 30 Vdc.
Receiver Without Relays
6.0 watts nominal @ 24 Vdc, 7.6 watts nominal @ 30 Vdc.
Receiver With Relays
6.4 watts nominal @ 24 Vdc, 8.0 watts nominal @ 30 Vdc.
TRANSMITTER LAMPS
Two xenon flashlamps, field-replaceable module.
WARMUP TIME—
1 minute for transmitter. 30 seconds for receiver from
power-up when correctly aligned.
CURRENT OUTPUT—
Linear 4-20 mA (isolated/non-isolated) rated at 600
ohms maximum loop resistance @ 24 Vdc operating
voltage.
RELAY OUTPUTS (Optional)—
Available on Ex d approved models only.
ALARM RELAYS—
Low and High
Form C Type (NO/NC). De-Energized during Normal
mode, Energized on Alarm.
Contact Rating: 5 amperes at 30 VDC.
Programmable for Latching or Non-Latching Operation.
Low Alarm: 0.25 to 3 LFL-meters
(default = 1 LFL-meters, Non-latching).
High Alarm: 1 to 3 LFL-meters
(default = 2 LFL-meters, Non-latching).
Alarm relays are programmable using HART or
MODBUS communication.
CaUtIon
When the oPeCL Gas Detector is used in
conjunction with an appropriate certified Control
Unit and configured for a non‑latching high alarm,
the control unit must
always latch and require a
deliberate manual action to clear a high gas alarm.
When used as a stand alone device, the high
alarm must always be programmed for latching
operation.
FAULT RELAY—
Form C Type (NO/NC). Energized during Normal mode,
De-Energized on Fault or loss of power.
Contact Rating: 5 amperes at 30 VDC.
Non-Latching Operation only — not programmable.
VISUAL STATUS INDICATOR—
Multi-color LED – Transmitter:
Green = Power on / OK
Yellow = Fault / warmup.
Multi-color LED – Receiver:
Red = Low alarm, high alarm, or calibration
Green = Power on / OK
Yellow = Fault / warmup.
ALARM RELAY SETPOINT RANGE—
Low Alarm: 0.25 to 3 LFL-meters (default = 1)
High Alarm: 1 to 3 LFL-meters (default = 2).
Alarm setpoint is programmable using HART or
MODBUS communication.
DETECTION RANGE—
5 to 120 meters.
CALIBRATION—
OPECL systems are span calibrated for methane at the
factory. Span calibration in the field is not required.
Zero calibration is accomplished in the field by one of
the following methods:
– On-board magnetic reed switch
– MODBUS communication
– HART communication
– LON communication (EQP models only).
RESPONSE TIME—
Refer to the appropriate Appendix for details.