Configure (Bench Calibration) - Emerson Rosemount 644R Quick Start Manual

June 2016

The Rosemount 644 communicates using the Field Communicator

(communication requires a loop resistance between 250 and 1100 ohms. Do not

operate when power is below 12 Vdc at the transmitter terminal). Refer to the

Rosemount 644

Manual

for more information.

1.1 Update the Field Communicator software

The Field Communicator field device revision Dev v6, Device Dashboard (DD) v1

or higher is required for complete functionality. The device will communicate

with all previous Rosemount 644 DD revisions.

Perform the following steps to determine if an upgrade is required.

1. Connect the sensor (see wiring diagram on the inside of housing cover).

2. Connect the bench power supply to the power terminals ("+" or "–").

3. Connect a Field Communicator to the loop across a loop resistor or at the

power/signal terminals on the transmitter.

4. The following message will appear if the communicator has a previous version

of the device descriptors (DDs).

Upgrade the communicator software to access new XMTR functions. Continue with

old description?

Note

If this notice does not appear, the latest DD is installed. If the latest version is not available,

the communicator will communicate properly. Note that, when the transmitter is

configured to utilize the advanced features of the transmitter (i.e. one of the added sensor

input types), the user will experience trouble communicating and will be prompted to turn

the communicator off. To prevent this from happening, upgrade to the latest DD or answer

NO to the question and default to the generic transmitter functionality.

Figure 1. Connecting a Communicator to a Bench Loop

Rosemount 644 Head Mount Transmitter

C

B

A. 250 Ω ≤ R

≤ 1100 Ω

L

™

B. AMS

Device Manager

Reference Manual

A

D

and the Field Communicator

Rosemount 644 Rail Mount Transmitter

C

B

C. Field Communicator

D. Power supply

Quick Start Guide

Reference

A

D

3