User's Manual

2.3 Transmitter / Sensor Location

Prior to the installation process, a location plan for placing the transmitter and sensor should be

developed. Factors such as accessibility, air movement, gas density in relation to air, emission

sources and environmental variables affect correct sensor and transmitter location.

Air movement by fans, prevailing winds and convection should be carefully evaluated to

determine if a leak is more likely to raise gas levels in certain areas within the facility. Vapor

density of a gas determines if it will rise or fall in air when there are no significant currents.

Lighter than air gases should have the monitors mounted 12 – 18 inches (30 – 45 centimeters)

above the potential gas leak and heavier than air gases should be this distance below. Even

though the ECO-A-X is designed for rugged service, sensors should be protected from

environmental damage from water, snow, shock, vibration and dirt.

Consider the following points when planning installation:

• Locate the controller where it will be accessible and visible.

• Carefully locate sensor in an area where gases may potentially accumulate.

• Use redundant systems to enhance protection and reliability.

• Light gases tend to rise; heavy gases tend to accumulate in low areas.

• Consider the air movement patterns within the facility.

• Consider the construction of the facility (such as trenches where heavy gases may

accumulate or peaks where light gases may accumulate)

• Seek advice from experts knowledgeable about the primary gas to be detected.

• Use common sense and refer to the regulatory publications that discuss guidelines for

your industry. The two most common installations options are as follows

Option 1

The sensor may be installed separated from the transmitter using a Certified Junction Box. If the

Net Safety Junction Box is being used, refer to JB-MPG-A/S in the Net Safety Multi-

purpose Junction Box (MAN-0081) for terminal designations. The transmitter is located near

eye- level. Conduit is run from the controller to the sensor. A Calibration Cup (CCS-1) can be

attached to the sensor. Tubing can be run from the CCS-1 to a convenient location accessible for

calibration gas to be injected.

Option 2

The sensor is wired directly to the controller. CCS-1 and tubing is used to facilitate calibration.

CCS-1

Controller (Transmitter) and sensor wired- separated drawing