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Quick Installation Guide
00825-0100-4664, Rev BB
January 2013
Rosemount 8712 / 8700 Series
23
Powering the Transmitter
The 8712E transmitter is designed to be powered by 90-250 Vac, 50–60 Hz or 12–42 Vdc.
Before connecting power to the Rosemount 8712E consider the following standards and be
sure to have the proper power supply, conduit, and other accessories. Wire the transmitter
according to national, local and plant electrical requirements for the supply voltage. See
Figure 19.
Supply Wire Requirements
Use 12 to 18 AWG wire rated for the proper temperature of the application. For connections
in ambient temperatures above 140 °F (60 °C), use a wire rated for 176 °F (80 °C). For
ambient temperatures greater than 176 °F (80 °C), use a wire rated for 230 °F (110 °C). For
DC powered transmitters with extended cable lengths, verify that there is a minimum of 12 V
DC at the terminals of the transmitter.
Disconnects
Connect the device through an external disconnect or circuit breaker. Clearly label the
disconnect or circuit breaker and locate it near the transmitter and per local electrical
control.
Installation Category
The installation category for the 8712E is (Overvoltage) Category II.
Overcurrent Protection
The Rosemount 8712E transmitter requires overcurrent protection of the supply lines.
Maximum ratings of overcurrent devices are shown in Table 10.
Figure 19. DC Power Supply Current Requirements
Table 10. Overcurrent Limits
Power System Fuse Rating Manufacturer
95-250 V AC 2 Amp, Quick Acting Bussman AGC2 or Equivalent
12-42 V DC 3 Amp, Quick Acting Bussman AGC3 or Equivalent
12
18
24
30
36
42
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Power Supply (Volts)
I = Supply current requirement (Amps)
V = Power supply voltage (Volts)
Supply Current (Amps)
4664RevBBQIG.fm Page 23 Friday, January 11, 2013 6:13 PM