Product introduction：

Engineered for versatility, the Rosemount 644 Temperature Transmitter is available with HART™, FOUNDATION™ Fieldbus or PROFIBUS™ protocols in head, field or rail mount styles and a variety of enclosure options. By adding a Local Operator Interface (LOI), you can update your transmitter configuration in the field without tools. For diverse application requirements, this transmitter includes diagnostic capabilities, such as Hot Backup™ capability, sensor drift alert and thermocouple degradation.

Product feature：

Extremely versatile temperature transmitter available in HART™, FOUNDATION™ Fieldbus or PROFIBUS™ protocols
Diverse mounting configurations including head, field or rail mount with many enclosure options
LOI option eliminates the need for special configuration tools (i.e. field communicator) for ease-of-use
Transmitter-sensor matching with Callendar-Van Dusen constants reduces total measurement error
Hot Backup™ capability and sensor drift alert with dual sensors ensure measurement integrity
Thermocouple degradation diagnostic monitors thermocouple health to detect degradation before failure
Minimum and maximum temperature tracking observes temperature extremes for easy troubleshooting
Device dashboards provide easy interface for simplified device configuration and diagnostic troubleshooting

Product Parameter：

Model

Code	Description
644	Temperature transmitter

Transmitter type

Code	Description
H	DIN A head mount - single sensor input
S	DIN A head mount - dual sensor input (HART only)
F	Field mount -single sensor input (HART only)
D	Field mount - dual sensor input (HART only)

Code	Description
A	4-20 mA with digital signal based on HART® Protocol
F	FOUNDATION Fieldbus digital signal (includes 2 analog input [AI] function blocks and backup Link Active Scheduler [LAS])
W	PROFIBUS° PA digital signal
KB	USA and Canada: Explosion-proof; Intrinsically Safe; Non-incendive; Dust ignition-proof
KD	USA, Canada, and ATEX Explosion-proof, Intrinsically Safe
I6	Canada Intrinsically Safe
K6	Canada Explosion-proof, Intrinsically Safe; Non-incendive; Dust Ignition-proof
I3	China intrinsic Safety
E3	China Flameproof
N3	China Type n
E1	ATEX Flameproof
N1	ATEx Type n
NC	ATEX Type n Component
K1	ATEX Flameproof; Intrinsic Safety;Type n; Dust
ND	ATEX Dust Ignition-Proof
KA	Canada and ATEX: Explosion-proof, Intrinsically Safe; Non-incendive
I1	ATEX Intrinsic Safety
E7	IECEx Flameproof
I7	lECEx Intrinsic Safety
N7	IECEx Type n
NG	IECEx Type n Component
K7	IECEx Flameproof, Intrinsic Safety, Type n; Dust
I2	INMETRO Intrinsic Safety
E4	japan Flameproof
I4	Japan Intrinsic Safety
E2	INMETRO Flameproof
EM	Technical Regulations Customs Union (EAC) Flameproof
IM	Technical Regulations Customs Union (EAC) Intrinsic Safety
KM	Technical Regulations Customs Union (EAC) Flameproof, Intrinsic Safety, and Dust lgnitionproof

Enclosur

Code	Housing style	Material	Entry size	Diameter
J5	Universal junction box, 2 entries	Aluminum	M20x 1.5	3 in. (76 mm)
J6	Universal junction box, 2 entries	Aluminum	½-14 NPT	3 in. (76 mm)
R1	Rosemount connection head, 2 entries	Aluminum	M20x 1.5	3 in. (76 mm)
R2	Rosemount connection head, 2 entries	Aluminum	½-14 NPT	3 in. (76 mm)
J1	Universal junction box, 3 entries	Aluminum	M20x 1.5	3.5 in. (89 mm)
J2	Universal junction box, 3 entries	Aluminum	½-14 NPT	3.5 in. (89 mm)
D1	Field mount housing.separate terminal compartment	Aluminum	M20x 1.5	3.5 in. (89 mm)
D2	Field mount housing.separate terminal compartment	Aluminum	½-14 NPT	3.5 in. (89 mm)
J3	Universal junction box, 3 entries	Cast SST	M20x 1.5	3.5 in. (89 mm)
J4	Universal junction box, 3 entries	Cast SST	½-14 NPT	3.5 in. (89 mm)
J7	Universal junction box, 2 entries	Cast SST	M20x 1.5	3 in. (76 mm)
J8	Universal junction box, 2 entries	Cast SST	½-14 NPT	3 in. (76 mm)
R3	Rosemount connection head, 2 entries	Cast SST	M20x 1.5	3 in. (76 mm)
R4	Rosemount connection head, 2 entries	Cast SST	½-14 NPT	3 in. (76 mm)
S1	Connection head, 2 entries	Polished SST	½-14 NPT	3 in. (76 mm)
S2	Connection head, 2 entries	Polished SST	½-14 NPTSM	3 in. (76 mm)
S3	Connection head, 2 entries	Polished SST	M20x 1.5	3 in. (76 mm)
S4	Connection head, 2 entries	Polished SST	M20x 1.5, M24x 1.4	3 in. (76 mm)