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Net Safety Monitoring Inc
MLP-A/AR/AD-ST1400-25 2
STEP 1 — PLAN
LOCATE CONTROLLER/SENSOR
Prior to the installation process, a location plan for placing the Controller and
Sensor should be developed. Although there are no absolute rules for
determining the quantity and location of a sensor or controller, the following
points should be considered when planning the installation.
• Locate the Controller where it will be accessible and visible.
• Oxygen deficiency can be caused by O2 consumption from such activities as
chemical reactions or combustion and/or displacement by other gases.
• Use redundant systems to enhance protection and reliability.
• Consider air movement patterns within the facility.
• Seek advice from experts knowledgeable about the primary gas to be
detected.
• Use common sense and refer to various regulatory publications that discuss
general guidelines for your industry.
The two most common installation options are as follows.
Option 1
Locate Sensor separate from Controller using a certified (Net Safety Muti-propose)
Junction Box.
The Controller is located near eye-level. Conduit is run from the Controller to
the Sensor. The Multi-purpose Junction Box is used to connect the conduit from
the Controller to the Sensor. A Calibration Cup can be attached to the Sensor.
Tubing can be run from the calibration cup to a convenient location accessible
for calibration gas to be injected. Refer to MAN-0081 for Multi-purpose Junction
Box Terminal designations.
Option 2
The Sensor is attached directly to the Controller. A Calibration Cup and tubing
may also be used to facilitate calibration as in Option 1 above.
See "Sensor and Controller" on page 6 for detailed instructions.
Figure 1: Locate Sensor/Controller
TIP:
The Calibration Cup allows for tubing to be affixed
to a Sensor mounted in remote locations. The tubing
is directed to a level, usually close to the Controller,
for easy injection of calibration gas.
The Calibration Cup can also act as a splash guard,
protecting sensors when mounted low to the ground.
Sensor
Conduit to
Controller
Apply Calibration Gas
Controller
Calibration Cup
About
eye
level
CCS-1