Emerson Net Safety ST3, Reference Manual

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2 Install
2.1 Unpack and inspect
Procedure
1. Carefully remove all the components from the packaging and check them against
the enclosed packing list.
2. Inspect all components for any obvious damage, such as broken or loose parts. If
you find any components missing or damaged, notify your local Net Safety
representative or the factory immediately.
2.2 Locate sensor
Prior to the installation process, develop a plan. Although there are no absolute rules
determining the quantity of detectors or location of a sensor, consider the following
points 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.
2.3 Mount sensor
You can either mount the sensor directly attached to a Net Safety Millennium II
transmitter or remotely, away from the transmitter.
Make sure the sensor is accessible for calibration and maintenance purposes. Also, make
sure the transmitter is accessible and visible.
2.3.1 Mount sensor remotely
If mounting the sensor remotely, connect it to a certified junction box. Make sure the
transmitter is located near eye level for easy access and the sensor is mounted where the
gas is likely to accumulate.
In order to ease the calibration process, you can attach a calibration cup (CCS-1) to the
bottom of the sensor housing and run calibration tubing from the calibration cup to a
convenient place for applying the calibration gas, eliminating the need to access the
sensor directly. In this case, to compensate for the effect of distance, consider decreasing
Reference Manual Install
00809-0100-4303 November 2020
Net Safety ST3 9