Reference Manual

00809-0400-4728, Rev AA June 2011

Rosemount 644

Performance

EMC (ElectroMagnetic Compatibility)

 

NAMUR NE 21 Standard

 

 

The 644H HART meets the requirements for NAMUR NE 21 Rating.

 

CE Mark

 

 

The 644 is compliant with Directive 2004/108/EC. Meets the criteria under

 

IEC 61326:2006.

 

 

Power Supply Effect

 

 

Less than ±0.005% of span per volt

 

Stability

 

 

RTDs and thermocouples have a stability of ±0.15% of output reading or 0.15

 

°C (whichever is greater) for 24 months.

 

Self Calibration

 

 

The analog-to-digital measurement circuitry automatically self-calibrates for

 

each temperature update by comparing the dynamic measurement to

 

extremely stable and accurate internal reference elements

 

Vibration Effect

 

 

The 644 is tested to the following specifications with no effect on performance

 

per IEC 60770-1, 1999:

 

 

 

 

 

Frequency

Vibration

 

10 to 60 Hz

0.21 mm displacement

 

60 to 2000 Hz

3 g peak acceleration

Sensor Connections

644244EH Sensor Connections Diagram

1 2 3 4

1 2 3 4

1 2 3 4

1 2 3 4

2-wire

3-wire RTD

4-wire RTD

T/C

RTD and

and

*

and

and mV

*Rosemount Inc. provides 4-wire sensors for all single element RTDs. You can use these RTDs in 3-wire configurations by leaving the unneeded leads disconnected and insulated with electrical tape.

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Emerson 644 manual Performance