Emerson Rosemount 148, Reference Manual, Page: 16 / 36

2.5 Wiring
WARNING
Electrical shock could cause death or serious injury.
All power to the transmitter is supplied over the signal wiring. Use ordinary copper wire
of sufficient size to ensure that the voltage across the transmitter power terminals does
not drop below 12.0 Vdc.
Verify that the operating atmosphere of the transmitter is consistent with the
appropriate hazardous locations certifications.
Use extreme caution when making contact with the leads and terminals. If the sensor is
installed in a high-voltage environment and a fault condition or installation error
occurs, the sensor leads and transmitter terminals could carry lethal voltages.
NOTICE
Do not apply high voltage (e.g., AC line voltage) to the transmitter terminals, since
abnormally high voltage can damage the unit. (Sensor and transmitter power terminals
are rated to 42.4 Vdc).
Note
The transmitters will accept inputs from a variety of RTD and thermocouple types. Refer to
Figure 2-5 when making sensor connections.
Use the following steps to wire the transmitter:
Procedure
1. Remove the terminal block cover, if applicable.
2. Connect the positive power lead to the “+” terminal. Connect the negative power
lead to the “-” terminal. See Figure 2-4 . Use extreme caution when making contact
with the leads and terminals.
3. Tighten the terminal screws.
4. Reattach and tighten the cover, if applicable. All connection head covers must be
fully engaged to met explosion-proof requirements.
5. Apply power (see “ Power supply ”)
Installation Reference Manual
June 2019 00809-0100-4148
16 www.Emerson.com