MAN-0093 Rev 0 Oxygen Sensor
June 2008
Net Safety Monitoring Inc.
8
SECTION 1: Plan
1.1 Locate Sensor
Prior to the installation process, a location plan for placing the sensor should be developed. Although there are
no absolute rules determining the quantity of detectors or location of a sensor, the following points should be
considered when planning the installation.
•
Carefully locate the sensor in an area where gases may potentially accumulate. (Remember, light gases
tend to rise and heavy gases tend to accumulate in low areas).
•
Use redundant systems to enhance protection and reliability.
•
Consider the air movement patterns within the facility.
•
Consider the construction of the facility such as trenches where heavy gases 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.
1.2 Sensor Non-Separated
The sensor is attached directly to a transmitter and located in the appropriate location for detecting the gas in
question.
Figure 3: Locating Sensor
1.3 Sensor Separated
Locate the sensor separate from a transmitter using a
‘junction box / separation kit’. The transmitter is located
near eye-level for easy access and the sensor is located
where the gas is likely to accumulate. A calibration cup is
clipped onto the bottom of the sensor housing and the
calibration tubing is attached to the calibration cup and
runs to a convenient place for applying calibration gas(air)
eliminating the need to access the sensor directly.
To compensate for distance when remotely calibrating, in
separation orientation, decrease the tubing diameter or
increase the calibration gas flow rate between the gas
canister and sensor. On initial install, always confirm
tubing run is not affecting calibration. Calibrate the sensor
using tubing run and then confirm readings directly at
sensor by applying calibration gas (air) and comparing the
output results. They should be accurate to the calibration
gas concentration used.
Sensor
Conduit to
Controller
Apply Calibration Gas
Controller
Calibration Cup
About
eye
level
