Emerson Rosemount 644h Manuel télécharger pdf (Page 37)

SECTION

A-1

A Reference Data

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-1

Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-8

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-11

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-13

SPECIFICATIONS

Functional

Inputs

User-selectable; sensor terminals rated to 42.4 V dc.

Output

2-wire 4–20 mA, linear with temperature or input; digital output signal

superimposed on 4–20 mA signal, available for a HART communicator or control

system interface

Isolation

Input/output isolation tested to 500 V ac rms (707 V dc) at 50/60 Hz

Local Display

The optional five-digit integral LCD meter includes a floating or fixed decimal

point. It also displays options for engineering units (°F, °C, °R, K, Ω, and

millivolts), milliamperes, and percent of span. The display can be configured to

alternate between selected display options. Display settings are preconfigured at

the factory according to the standard transmitter configuration. They can be

reconfigured in the field using a HART Communicator.

Humidity Limits

0–99% relative humidity, non-condensing

Turn-on Time

Performance within specifications is less than 5.0 seconds after power is applied to

transmitter when damping value is set to zero seconds

Update Time

Approximately 0.5 seconds

Power Supply

An external power supply is required. The transmitter operates on 12.0 to 42.4 V

dc transmitter terminal voltage with load resistance between 250 and 1100 ohms.

A minimum of 17.75 V dc power supply is required with a load of 250 ohms.

Transmitter power terminals are rated to 42.4 V dc.

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Emerson Rosemount 644h Manuel Page 37