Detcon IR-642 User Manual

Detcon MicroSafe™IR-640 Carbon Dioxide Sensor (0-5%CO2) IR642 Carbon Dioxide Sensor (10%-100%) Operator’s Installation & Instruction ManualNovembe

Consideration should be given to easy access by maintenance personnel as well as the consequences of close prox-imity to contaminants that may foul th

tact outputs: NO = Normally Open; NC = Normally closed (see figure 3).Note: If a voltage signal output is desired in place of the 4-20mA output, a 1/4

g) Replace the plug-in control circuit and replace the junction box cover.3.5.6 Remote Mounting ApplicationsSome sensor mounting applications require

Material Requirements* Detcon PN 3270 MicroSafe™ Programming Magnet* Digital volt/ohm meter.3.6.2 Programming Magnet Operating InstructionsOperator in

than 30 seconds, the sensor will return to its normal operating condition.3.6.3 Initial Operational TestsAfter a warm up period has been allowed for,

fault mode which will cause the display to alternate between the sensor’s current status reading and the calibra-tion fault screen which appears as:

Span calibration is complete.3.7.3 Additional Notes1. Upon entering the calibration menu, the 4-20 mA signal drops to 2 mA and is held at this level

3.9.1 Alarm LevelsBoth alarm 1 and alarm 2 levels are factory set prior to shipment. Alarm 1 is set at 20% of full-scale range; alarm 2at 60% of full-

If during calibration the sensor circuitry is unable to attain the proper adjustment for zero or span, the sensor willenter into the calibration fault

to the RS-485 ID number would require the sensor housing to be opened, thus declassification of the area wouldbe required. See section 3.5.4-f for det

Table of Contents3.0 Description3.1 Principle of Operation3.2 Application3.3 Specifications3.4 Operating Software3.5 Installation3.6 Start-up3.7 Calib

Bit 6 1-Alarm 1 is ascending 0-Alarm 1 is descendingBit 5 1-Alarm 1 is normally energized 0-Alarm 1 is normally de-energizedBit 4 1-Alarm 1 is latchin

adjust screw located beneath the metallic face plate. The adjustment location is marked “CONTRAST”. See figure 7for location.3.13 OPTICAL SENSOR REPL

2. Verify required DC power is applied to correct terminals.3. Swap with a known-good transmitter to determine if transmitter is faulty.Bad 4-20 mA ou

3.16 WARRANTYDetcon, Inc., as manufacturer, warrants each NDIR optical plug in sensor (part no. 370-365878-111 or 370-287724-232), for a pro-rated fi

Detcon Model IR-640/IR-642 Carbon Dioxide Sensor PG.24NORMALOPERATIONCALIBRATIONPGM1 (3) PGM2 (3)PGM1 (M) PGM2 (M)PGM1 (3)SET ALM1 @ ##%INCDECPGM1

3.0 DESCRIPTIONDetcon MicroSafe™ Model IR-640, carbon dioxide gas sensors are non-intrusive “Smart” sensors designed to detectand monitor CO2gas in a

3.0.2 Microprocessor Control CircuitThe control circuit is microprocessor based and is packaged as a plug-in field replaceable module, facilitating e

The sensors are packaged in a cast metal explosion proof enclosure. The enclosure is fitted with a threaded coverthat has a glass lens window. Magneti

3.2 APPLICATIONModel IR-640/IR-642 MicroSafe™ sensors are designed to detect and monitor CO2gas in ambient air. Minimum sen-sitivity and scale resolu

T50 < 15 seconds; T90 < 35 secondsClearing Time90% < 35 secondsRepeatability± 3% FSRange0 - 0.3/0.5/1/2/3/5% withthe IR-6400-10/0-25/0-50/0-1

3.4.3 Program ModeThe program mode provides a program status menu, allows for the adjustment of alarm set point levels, and theselection of the calib

22 3A 16 10A20 5A 14 20A18 7A 12 25AThe RS-485 (if applicable) requires 24 gauge, two conductor, shielded, twisted pair cable between sensor and hostP