Owner's manual

3.4.3 Program Mode
The program mode provides a program status menu, allows for the adjustment of alarm set point levels, and the
selection of the calibration gas level setting..
3.4.3.1 Program Status
The program status scrolls through a menu that displays:
* The gas type, range of detection and software version number. The menu item appears as: “CO2 RANGE V6.0”
* The calibration gas level setting. The menu item appears as: “CalLevel @ #.##%”
* Sensor temperature in °C appears as: “TEMPERATURE ## °C”
* The estimated remaining sensor life. The menu item appears as: “OPTICS AT 100%”
3.4.3.2 Calibration Level Adjustment
The Calibration level is adjustable from 10% to 90% of full-scale range. The menu item appears as: “CalLevel @ #.##%”
3.5 INSTALLATION
Optimum performance of ambient air/gas sensor devices is directly relative to proper location and installation practice.
3.5.1 Field Wiring Table
(4-20 mA output)
Detcon Model IR-540/IR-541/IR-542 CO2 sensor assemblies require three conductor connection between power
supplies and host electronic controllers. Wiring designators are
+
(DC),
–
(DC) , and
mA
(sensor signal).
Maximum single conductor resistance between sensor and controller is 10 ohms. Maximum wire size for termina-
tion in the sensor assembly terminal board is 14 gauge.
AWG Wire_Dia. Meters Feet
20 0.812mm 1120 3350
18 1.024mm 1750 5250
16 1.291mm 2800 8400
14 1.628mm 4480 13,400
Note 1:
This wiring table is based on stranded tinned copper wire and is designed to serve as a reference only.
Note 2: Shielded cable may be required in installations where cable trays or conduit runs include high voltage
lines or other sources of induced interference.
Note 3: The supply of power must be from an isolating source with over-current protection as follows:
AWG
Over-current Protection AWG Over-current Protection
22 3A 16 10A
20 5A 14 20A
18 7A 12 25A
The RS-485 (if applicable) requires 24 gauge, two conductor, shielded, twisted pair cable between sensor and host
PC. Use Belden part number 9841. Two sets of terminals are located on the connector board to facilitate serial loop
wiring from sensor to sensor. Wiring designators are
A
&
B
(IN) and
A
&
B
(OUT).
3.5.2 Sensor Location
Selection of sensor location is critical to the overall safe performance of the product. Five factors play an important
role in selection of sensor locations:
(1) Density of the gas to be detected
(2) Most probable leak or generation sources within the industrial process
(3) Ventilation or prevailing wind conditions
(4) Personnel exposure
(5) Accessibility for routine maintenance
Detcon Model IR-540/IR-542 Carbon Dioxide Sensor PG.8