Instruction Manual

Bad 4-20 mA output or RS485 Output

1. Check that wiring is connected to correct terminal outputs.

2. Swap with a known-good transmitter to determine if transmitter is faulty

Unstable output/Sudden Spiking/Nuisance Alarms

. Check condulet for accumulated water.

2. Check transmitter and Terminal PCB for abnormal corrosion.

3. Determine if problem correlates with condensation cycles.

4. Add/change Detcon condensation prevention packet.

5. Check for unstable power supply.

6. Check for inadequate grounding.

7. If correlates with radio communications then use Detcon RFI filter accessory.

8. Contact Detcon for assistance in optimizing shielding, grounding, and RFI protection.

Excessive Span Drift or Slow Response

1. Verify correct cal gas flow rate and proper use of the cal gas adapter.

2. Check validity of cal gas via the expiration date and use pull tube if necessary.

3. Check for obstructions through s/s sinter element (including being wet).

4. Replace plug-in sensor if Optics Life is <25%.

Drifting Zero

It may be the correct reading if there are real gas leaks or the sensor was zero calibrated when actual gas was present and subse-

quently cleared.

1. Recalibrate zero using target gas “free” sample.

2. Replace plug-in sensor if Optics Life is <25%.

3.15 SPARE PARTS LIST

613-010000-000 Sensor rain shield

613-120000-000 Sensor splash guard

943-000006-132 Threaded Calibration Adapter

390-000087-000 IR sensor housing assembly (plug-in detector PN 370-365871-212, not included)

370-365871-212 Field replaceable NDIR optical plug in sensor

926-225500-100 IR-622 Plug-in control circuit

500-002042-000 IR Connector board

327-000000-000 Programming Magnet

897-850800-000 3 port enclosure less cover

897-850700-000 Enclosure glass lens cover

960-202200-000 Condensation prevention packet (replace annually).

3.16 WARRANTY

Detcon, Inc., as manufacturer, warrants each NDIR optical plug in sensor (part no. 370-365871-212), for a pro-rated

five year period under the conditions described as follows: The warranty period begins on the date of shipment to

Detcon Model IR-622 Combustible Hydrocarbon Sensor PG.22