Table of Contents
Specifications and Reference Data
July 2016
Appendix A
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 83
4–20 mA / HART specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 85
Dimensional drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 88
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 91
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 96
Specifications and Reference Data for Rosemount 644 HART Head Mount . . . . . . . . . . . . . . . page 97
A.1 Specifications
A.1.1 Functional
Inputs
User-selectable; sensor terminals rated to 42.4 Vdc.
on page 86
for sensor options.
Output
Single 2-wire device with 4-20 mA/HART
Selectable), linear with temperature or input.
Isolation
Input/output isolation tested to 620 Vrms (876.8 Vpp) at 50/60 Hz
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, , and millivolts), 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 HART communications.
The device also supports the use of a two-line, 8- and 6-digit
(respectively) Local Operator Interface display supporting the
same functionality as the basic display with the added capability to
perform a number of configuration tasks on the Rosemount 644.
Humidity limits
0–95% relative humidity
Update time
0.5 seconds per sensor
1 sec - Head mount HART ordered with Dual Sensors)
Accuracy
(default configuration) PT 100
HART protocol (0-100 °C): ±0.18 °C
±0.1 °C (when ordered with option P8)
Specifications and Reference Data
Specifications and Reference Data
See"Accuracy"
®
(Revision 5 or 7
A.1.2 Physical
Electrical connections
Model
Power and sensor terminals
™
Rosemount
Compression screws permanently fixed to
644H
terminal block
Rosemount
Compression screw permanently fixed to front
644R
panel
Field Communicator connections
Communication terminals
Rosemount 644H Clips permanently fixed to terminal block
Rosemount 644R
Clips permanently fixed to front panel
Materials of construction
Electronics housing and terminal block
Rosemount
GE polyphenylene oxide glass reinforced
644H
Rosemount
Polycarbonate
644R
Enclosure (Options J5, J6, R1, and R2)
Housing
Low-copper aluminum
Paint
Polyurethane
Cover O-ring
Buna-N
Materials of constructions (stainless steel housing for
Biotechnology, Pharmaceutical Industries, and Sanitary
Applications)
Housing and Standard Meter Cover
316 SST
Cover O-Ring
Buna-N
Reference Manual
00809-0100-4728, Rev MB
83
Table of Contents
