Rosemount 644 Temperature Transmitter
DIN head mount, field mount, and rail mount form factors
4–20 mA/HART®
with Selectable Revision 5 and 7,
FOUNDATION Fieldbus or PROFIBUS
PA Protocol support
SIL3 Capable: IEC 61508 certified by an accredited thirdparty agency for use in safety instrumented systems up to SIL 3 [minimum requirement of single use (1oo1) for SIL 2 and redundant use (1oo2) for SIL 3]
Enhanced display with Local Operator Interface (LOI)
LCD display
Integral transient protection
Enhanced accuracy and stability
Transmitter-sensor matching with Callendar-Van Dusen constants
Variety of enclosures
H = DIN A head mount - single sensor input
A = 4–20 mA with digital signal based on HART Protocol
NA = No approval
J5 = Universal junction box, 2 entries Aluminum M20 × 1.5 3-in. (76 mm)
