Thermo Scientific LevelPRO Series, Installation Manual

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Wiring
Power Supply
Thermo Fisher Scientific LevelPRO Installation Guide
4-5
The system is designed to operate on 24 Vdc. If the optional AC power
board is installed, the system can also operate on 115 or 230 Vac (± 15%),
50/60 Hz. The maximum input power requirement is 12 VA. If both AC
and DC power are supplied to the detector, the detector will draw power
from whichever source provides the higher DC voltage.
The maximum length of the cable that can be used to supply power varies
depending on the wire gauge. Refer to the wiring drawing (868503) for
cable information and other wiring details.
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. For
intrinsically safe systems, refer to ANSI / ISA RP 12.6.

Note
To meet the requirements of CSA 1010.1, an external switch or
circuit breaker must be installed to allow the power source to be
disconnected from the gauge. In addition, protective bonding (grounding)
must always be provided, even if DC power is used.

J12 on the CPU board is the connector for the DC source voltage wiring.
Refer to the wiring drawing (868503) and to the table below for
connections.
Table 4–1. DC power connections
Power Supply J12 on CPU Board
Positive (+) J12-2
Negative (-) J12-1
Note
To meet the requirements of CSA 1010.1, the input DC terminals
must be supplied from a SELV (Safety Extra Low Voltage) source.

Power Supply
DC Power