Emerson Comprehensive Guide for Carbon Monoxide Alarm Sensor Troubleshooting and Calibration

output indicates that the smog alarm threshold has been exceeded. Current output of 2.5 mA indicates the presence of a system fault. Current output of 3.3 mA indicates a build-up of particulate in the sensor chamber.

Sensor Life

Sensor response normally deteriorates slowly over a period of several years, depending on exposure, until there is no longer sufficient signal. When this condition occurs, calibration will not be possible, the analog output will lock at 2.5mA, the status LED flashes red, and SENSOR FAIL message scrolls on the display.

Install a new sensor and re-calibrate. The calibration function automatically adjusts span amplifier gain across a broad range without any need for manual adjustment of potentiometers or jumpers.

CAUTION:

Any type of gas sensor is susceptible to damage when exposed to high levels of gas, therefore, check the sensor for accurate response and if necessary perform a calibration or replace the sensor after any high level alarm.

Chapter 5 Troubleshooting

Response to the input should be checked and if necessary calibration should be performed whenever any of the following occur; excess negative sensor drift is indicated by 2.5mA current output, when the sensor or transmitter supplying a signal to the UNI-TRAN Premium Plus is added or removed whenever, the sensor is exposed to high concentrations of gas over full scale

Refer to the calibration procedure in the operation chapter.

The Toxic Detector is not designed to be repaired in the field. If a problem should develop, first zero the device and carefully check for correct wiring. If it is determined that the problem is caused by an electronic defect, the device must be returned to the factory for repair.

The unit is under full warranty for Two Years from the date of purchase.

Net Safety Monitoring Inc. supplies all distributors with advance replacement units. These units are available to you during the warranty period. This allows Net Safety Monitoring Inc. time to repair your unit while you keep your operations running smoothly.

Return and Repair

Before returning devices or components, contact the nearest distributor so that an MRA (Material Return Authorization) number can be assigned. A written statement describing the malfunction must accompany the returned device or component to hasten finding the cause of the failure, thereby reducing the time and cost of the repair to you. Use sufficient packing material in addition to an anti-static bag or aluminum-backed cardboard as protection from electrostatic discharge.

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