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Reference Manual
00809-0200-4728, Rev RA
Appendix A: Specifications and Reference Data
April 2015
Specifications and Reference Data
A.5
Specifications and reference data for 644 HART
Head Mount
(Device Revision 7 or previous)
A.5.1
Functional specifications
Inputs
User-selectable; sensor terminals rated to 42.4 Vdc. See
for sensor
options.
Output
Single 2-wire device with either 4-20 mA/HART, linear with temperature or input. Device
supports protocol revision HART 5.
Isolation
Input/output isolation tested to 600 Vrms.
Local display
The optional five-digit integral LCD display includes a floating or fixed decimal point. It can also
display engineering units (°F, °C, °R, K, W, and mV), mA, 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 compliant Field Communicator.
Humidity limits
0–95% relative humidity
Update time
≤
0.5 sec. single sensor mode
≤
1.0 sec. dual sensor mode
Accuracy
(default configuration) PT 100
HART (0-100 °C): ±0.18 °C
Summary of Contents for Rosemount 644
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