Detcon IR-700 - Initial Start Up

Model IR-700
IR-700 Instruction Manual Rev. 4.3 Page 13 of 46
b) Observing correct polarity, terminate the 3-conductor 4-20mA field wiring (+, -, mA) to the sensor assembly
wiring in accordance with the detail shown in Figure 14. If the 4-20mA output is not used, the green wire
from the sensor must be connected to the (-) terminal on the Transient Protection Module.
NOTE: If the 4-20mA output is not being used, the Green wire from the sensor must be
connected to the Black wire at the (-) terminal on the Transient Protection Module to
ensure proper sensor operation.
c) If applicable, terminate the RS-485 serial wiring as shown in Figure 14. Use the second plug (Out) as
termination point on the customer side to facilitate a continuous RS-485 serial loop
The RS-485 (if applicable) requires 24 gauge, two conductor, shielded, twisted pair cable between sensor and
host controller. General Cable Commodore part number ZO16P0022189 is recommended.
NOTE: Install a 120 ohm resistor across A & B terminals on the last sensor in the serial loop.
d) Trim all exposed wire leads if they are not permanently landed in a terminal block.
e) Replace the junction box cover.
2.7 Initial Start Up
CAUTION: Do not apply power to the sensor assembly in a hazardous area unless the junction box
cover is tight and all electrical seals have been installed
Upon completion of all mechanical mounting and termination of all field wiring, apply system power in the
range of 11.5-30 VDC (24 VDC typical) and observe the following normal conditions:
a) IR-700 display reads “0”, and no fault messages are flashing.
b) A temporary non-zero reading may occur as the sensor reaches stabilization. The reading will converge to
“0” within 1-2 minutes of power-up, assuming there is no combustible gas in the area of the sensor.
NOTE: The 4-20mA signal is held constant at 4mA for the first two minutes after power up.
Initial Operational Tests
After a warm up period of 1 hour, the sensor should be checked to verify sensitivity to combustible gas. For the
IR-700 CO
2
series sensors, test the sensor with a suitable CO
2
span gas.
Material Requirements
• Detcon PN 613-120000-700 700 Series Splash Guard with integral Cal Port –OR-
• Detcon PN 943-000006-132 Threaded Calibration Adapter
• Detcon PN 942-520124-050 Span Gas; 50% LEL methane/balance Air at fixed flow rate of 200 cc/min
(for 0-100% range)
• Detcon PN 942-520124-025 Span Gas; 25% LEL methane/balance Air at fixed flow rate of 200 cc/min
(for 0-50% range)