Detcon IR-622 User Manual
Page 8
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:
“LEL 0-100 V6.0”
* The alarm set point level of alarm 1. The menu item appears as:
“ALM1 SET @ ##%”
* The alarm f iring direction of alarm 1. The menu item appears as:
“ALM1 ASCENDING” or descending.
* The alarm relay latch mode of alarm 1. The menu item appears as:
“ALM1 NONLATCHING” or latching.
* The alarm relay energize state of alarm 1. The menu item appears as:
“ALM1 DE-ENERGIZED” or energized.
* The alarm set point level of alarm 2. The menu item appears as:
“ALM2 SET @ ##%”
* The alarm f iring direction of alarm 2. The menu item appears as:
“ALM2 ASCENDING” or descending.
* The alarm relay latch mode of alarm 2. The menu item appears as:
“ALM2 LATCHING” or nonlatching.
* The alarm relay energize state of alarm 2. The menu item appears as:
“ALM2 DE-ENERGIZED” or energized.
* The alarm relay latch mode of the fault alarm. The menu item appears as:
“FLT NONLATCHING” or latching.
* The alarm relay energize state of the fault alarm. The menu item appears as:
“FLT ENERGIZED” or deenergized.
* The calibration gas level setting. The menu item appears as:
“CalLevel @ xx%”
* Identif ication of the RS-485 ID number setting. The menu item appears as:
“485 ID SET @ ##”
* Sensor temperature in °C appears as:
“TEMPERATURE xx °C”
* The estimated remaining sensor life. The menu item appears as:
“OPTICS AT 100%”
3.4.3.2 Alarm 1 Level Adjustment
The alarm 1 level is adjustable over the range 10 to 90%. For combustible gas sensors, the level is factory set at
20%. The menu item appears as:
“SET ALM1 @ 20%”
3.4.3.3 Alarm 2 Level Adjustment
The alarm 2 level is also adjustable over the range 10 to 90%. For combustible gas sensors, the level is factory set at
60%. The menu item appears as:
“SET ALM2 @ 60%”
3.4.3.4 Calibration Level Adjustment
The Calibration level is adjustable from 10% to 90% LEL. The menu item appears as:
“CalLevel @ ##%”
3.5 I
NSTALLATION
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-622 combustible gas sensor assemblies require three conductor connection between power sup-
plies 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 termination in the
sensor assembly terminal board is 14 gauge.
AWG
Meters
Feet
20
240
800
18
360
1200
16
600
2000
14
900
3000
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).
Detcon Model IR-622 Combustible Hydrocarbon Sensor PG.8