Emerson Rosemount 644, Reference Manual

Page: 104 / 182

94
Reference Manual
00809-0200-4728, Rev RA
Appendix A: Specifications and Reference Data
April 2015
Specifications and Reference Data
A.1.3 Performance
EMC (electromagnetic compatibility)
NAMUR NE 21 Standard
The Rosemount 644 meets the requirements for the NAMUR NE 21 rating.
CE electromagnetic compatibility compliance testing
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.
When ordered with the P8 option code:

RTDs: ±0.25% of reading or 0.25 °C, whichever is greater, for five years

Thermocouples: ±0.5% of reading or 0.5 °C, whichever is greater, for five years
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 HART is tested to the following specifications with no effect on performance per IEC
60770-1, 2010:
Susceptibility Parameter Influence
HART
ESD

6 kV contact discharge

8 kV air discharge
None
Radiated 
80 MHz to 2.7 GHz at 10 V/m
< 1.0%
Burst

1 kV for I.O.
None
Surge 
1 kV line–ground
None
Conducted 
10 kHz to 80 MHz at 10 V
< 1.0%
Frequency Vibration
10 to 60 Hz 0.35 mm displacement
60 to 1000 Hz 5 g (50 m/s
2
) peak acceleration