Installation Manual

Accu-Wave Chapter 3 Wiring Procedures
TN Technologies 3-1
Chapter 3 Wiring Procedures
The Accu-Wave electronics includes the following boards.
• Main Electronics Board
• RS-232 daughter board (optional).
• Hart Communications daughter board (future option).
The required wiring steps are:
• connect 24 Vdc power supply to the gauge, and
• connect a remote computer terminal or Hand Held Terminal to the gauge via the
serial communication port.
Additional, optional wiring may include:
• 4-20 mA current output,
• contact closure input, or
• optional, remote display (2 line x 16 characters).
Caution: Remove all power from the unit before making any connections.
WARNING: All wiring must be done by qualified individuals in accordance with
applicable codes such as the NEC (National Electric Code) ANSI/NFPA
70 specifications or the Canadian Electrical Code Part 1.
Initial Wiring Preparations
Warning: Do not apply power to the unit in any hazardous area unless the safety
ground is properly wired inside the unit and the cover is properly
installed.
Hazardous Location Installations – The cable entries must be sealed
per the Installation Layout Drawing (868502).
Non-Hazardous Location Installations – The cable entries into the
enclosures must be sealed to prevent passage of gas or vapors. The
sealing compound should not be affected by the surrounding
atmosphere or liquids. The minimum thickness of the sealing
compound should be 5/8 in (16 mm).
If metal conduit is used, the conduit must be grounded.
Caution: Insulate the drain wire to eliminate ground loops.
Caution: CSA certified fittings must be used to maintain CSA rating for
enclosure.