Emerson 644 manual Performance

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.

A-3