CiDRA Sonar Process Monitoring System - Manual (Page 28)

12
SUPPLEMENTARY INSTRUCTIONS FOR SAFE
MAINTENANCE, SERVICING AND EMERGENCY
REPAIR
12.1 General
12.1.1 UOS, OFF And No Explosive Gasses Present
All maintenance, service, and repair should be performed with dead
circuits and after testing to make sure that no explosive gas mixtures
are present, unless otherwise stated (UOS).
12.1.2 Notify Control Room
Note: In most cases, servicing will interrupt normal functioning of the
meter and its outputs. If the meter is being used in a control loop, this
can cause the loop to “open”. Inform Control Room Personnel that the
meter will be “off-line” so the control loop can be placed into a manual
mode of operation until adjustments are complete and the meter is
ready to be brought back “on line” in the control loop.
12.2 Transmitter
12.2.1 General
12.2.1.1 Ensure There Are No Explosive Gases Present
No connection or disconnection of wiring at any of the terminal blocks
in the transmitter shall be performed in the hazardous area without
first testing to make sure that no explosive gas mixtures are present.
12.2.1.2 Keep Clean and Dry
Keep the inside of the transmitter enclosure clean and dry.
12.2.2 Mains Power OFF
Wiring of the mains power terminal blocks shall only be performed
with the mains power wiring in a de-powered and locked-out safe
state.
12.2.3 Fuse Replacement
The two fuses on the power entry board are the only user serviceable
fuses. They may only be replaced with the mains power wiring in a
de-powered and locked-out safe state. Use only the replacement
fuses indicated on the fuse warning label.
20909-01C Rev 04 Page 12-1