Reference Manual

00809-0100-4808, Rev CA June 2008

Rosemount 3051N

FIGURE 3-7. Power Supply Load Limitations.

Max. Loop Resistance = 43.5 (Power Supply Voltage – 10.5) ohms

Load (ohms)

1935

 

 

 

 

 

 

1500

 

 

 

 

 

 

 

 

 

 

 

 

1000

 

 

 

 

Design

 

 

 

 

 

500

 

 

 

 

Region

0

 

 

 

 

 

 

 

 

 

 

 

 

 

10.5

20

30

40

55

 

 

Voltage (V dc)

 

 

Communication requires a minimum loop resistance of 250 ohms.

Wiring

To make connections, perform the following procedure:

 

1. Remove the housing cover on the side marked “FIELD TERMINALS.” Do

 

not remove the cover in explosive atmospheres when the circuit is alive.

 

All power to the transmitter is supplied over the signal wiring.

 

2. Connect the lead that originates at the positive side of the power supply

 

to the terminal marked “+” and the lead that originates from the negative

 

side of the power supply to the terminal marked “–”. Avoid contact with

 

the leads and terminals. Do not connect the powered signal wiring to the

 

test terminals. Power could damage the test diode in the test connection.

 

3. Plug and seal unused conduit connections on the transmitter housing to

 

avoid moisture accumulation in the terminal side of the housing. If you do

 

not seal the unused connections, mount the transmitter with the electrical

 

housing positioned downward for drainage. Install wiring with a drip loop.

 

Arrange the drip loop so the bottom is lower than the conduit connections

 

and the transmitter housing.

 

 

 

NOTE

 

Signal wiring needs to be shielded, but use twisted pairs for best results. In

 

order to ensure proper communication, use 24 AWG or larger wire, and do not

 

exceed 5000 feet (1 500 meters).

 

 

 

Do not use inductive-based transient protectors, including the Rosemount

 

470, as they can adversely affect the output of Rosemount 3051N 4–20 mA

 

transmitters.The Rosemount 3051N includes the transient protection terminal

 

block (T1) as standard.

 

Signal Wiring Grounding

 

Do not run signal wiring in conduit or open trays with power wiring, or near

 

heavy electrical equipment. You may ground the signal wiring at any one point

 

on the signal loop, or leave it ungrounded. The negative terminal of the power

 

supply is a recommended grounding point.

See “Safety Messages” on page 3-1for warning information.

3-13

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Emerson Process Management 3051N manual Wiring, Power Supply Load Limitations

3051N specifications

The Emerson Process Management 3051N is a state-of-the-art pressure transmitter that exemplifies precision and reliability in process automation. Designed for a wide range of industrial applications, the 3051N is celebrated for its advanced features, innovative technologies, and robust construction, catering to the evolving needs of process industries.

One of the standout features of the 3051N is its exceptional accuracy. With a standard accuracy rating of ±0.075% of span, it ensures precise pressure measurements, critical for maintaining optimal process conditions. This high level of accuracy makes it suitable for applications in industries such as oil and gas, chemicals, and water treatment, where even minor deviations can lead to significant operational issues.

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In conclusion, the Emerson Process Management 3051N pressure transmitter is a versatile and highly efficient device that integrates advanced technology with robust design and exceptional accuracy. Its ability to adapt to various industrial demands while providing predictive diagnostics makes it a preferred choice for professionals seeking reliability and precision in process management.