CiDRA Sonar Process Monitoring System - Manual (Page 29)

12.2.4 Sensor Terminal Blocks
The Sensor Terminal blocks should be wired with the mains power
OFF. This ensures that these signals are all de-powered.
12.2.5 Customer Input / Output and Fieldbus Terminal Blocks
To the extent possible, ensure that the equipment on the far end of
these lines is de-powered before servicing the associated terminal
block connections. If unsure about whether the remote equipment is
de-powered, ensure that no explosive gas mixtures are present before
servicing.
12.2.6 Electrical Circuitry and Electro-Static Discharge (ESD)
Take simple ESD precautions to protect the electronics such as
touching a grounded metal object prior to reaching into the transmitter
or sensor head enclosures and avoiding touching the circuit boards
with hands, gloves, or sleeves when servicing the system.
12.3 Sensor Head
12.3.1 General
Ensure the inside of the sensor head cover remains clean and dry
during installation and inspection.
12.3.2 Sensor Head Electrical Connector
Properly re-install the sensor head connector if it is removed for
inspection or troubleshooting.
Note: This cable connector can be removed with the power ON and
without the necessity of testing first to be certain that no hazardous
gasses are present. Close and latch the dust cover over the
connector half that remains on the sensor head cover whenever the
sensor head electrical connector on the cable is removed from the
sensor head cover. Prevent contamination of the de-mated cable
connector. Prior to mating the cable to the cover connector, inspect
both halves to ensure they are clean and dry.
12.3.3 Access Panel
Properly re-install the access panel after every time it is opened.
12.3.4 Sensor Band
12.3.4.1 Use of Access Panel
The access panel must be used to gain access to and disconnect the
sensor band cable connector from the preamplifier before the sensor
20909-01C Rev 04 Page 12-2