Emerson Rosemount 644h Manuál stáhnout pdf (Strana 20)

2-10

Rosemount Inc

Use the following procedure to install the meter.

1. If the transmitter is installed in a loop, secure the loop and disconnect the

power. If the transmitter is installed in an enclosure, remove the cover from

the enclosure.

2. Decide meter orientation (the meter can be rotated in 90° increments). To

change meter orientation, remove the screws located above and below the

display screen. Lift the meter off the meter spacer. Remove the 8-pin plug and

re-insert it in the location that will result in the desired viewing orientation.

3. Reattach the meter to the meter spacer using the screws. If the meter was

rotated 90° from its original position it will be necessary to remove the screws

from their original holes and re-insert them in the adjacent screws holes.

4. Line up the 10-pin connector with the 10-pin socket and push the meter into

the transmitter until it snaps into place.

5. Attach the meter cover; tighten at least one-third turn after the O-ring

contacts the transmitter housing. The cover must be fully engaged to meet

explosion-proof requirements.

6. Use a Model 275 HART Communicator to configure the meter to the desired

display. Refer to “LCD Meter Installation” on page 2-9 for information on

configuring the LCD meter.

NOTE

Observe the following LCD meter temperature limits:

Operating: –4 to 185 °F (–20 to 85 °C)

Storage: –50 to 185 °F (–45 to 85 °C)

FIELD WIRING

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 V dc.

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. Use extreme caution when making contact with the leads and

terminals.

NOTE

Do not apply high voltage (e.g., ac line voltage) to the transmitter terminals.

Abnormally high voltage can damage the unit. (Sensor and transmitter power

terminals are rated to 42.4 V dc.)

For multichannel installations, see “Multichannel Installations” on page 2-9.

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Emerson Rosemount 644h Manuál Strana 20