Fisher 244EH User Manual
Rosemount Models 244EH and 244ER PC-Programmable Temperature Transmitters
C-2
OLD TRANSMITTER
OLD TRANSMITTER
Transmitter Design
Sensor Wiring Diagrams
Special Mounting
Considerations
Considerations
Models 644H and 244EH
Models 644R and 244ER
Two Mounting Holes
Models 644 and 244E
* Rosemount Inc. provides 4-wire sensors for all single element RTDs. You can use these RTDs in
3-wire configurations by leaving the unneeded leads disconnected and insulated with
electrical tape.
electrical tape.
** The transmitters must be configured for a 3-wire RTD in order to recognize an RTD with a
compensation loop.
64
4-
0
0
0
0
B
01
B
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
2-wire
RTD and
V
3-wire
RTD
and
V
4-wire
RTD
and
V
T/C and
mV
RTD with
Comp.
Loop
1
*
**
Mounting a Model 644H to a DIN Rail
G-Rail
Top Hat Rail
1. Assemble the appropriate rail clip (part number
00644-5301-0001).
2. Attach the transmitter to a rail or panel.
3. Attach the thermowell to the pipe or process container wall
3. Attach the thermowell to the pipe or process container wall
and attach sufficient lengths of sensor lead wire. Tighten
the connection head cover.
the connection head cover.
4. Run the sensor lead wires from to the sensor and set the
transmitter failure mode switch.
5. Attach the sensor and power leads to the transmitter.
Use with an Existing Threaded Sensor Connection Head
To mount the Models 644H and 244EH in an existing L1 connection
head, assemble the Model 644H retrofit kit (part number
00644-5321-0001) to the transmitter as shown. Then mount the
assembly in the connection head.
head, assemble the Model 644H retrofit kit (part number
00644-5321-0001) to the transmitter as shown. Then mount the
assembly in the connection head.
64
4-
530
1B
01
B
,D
0
1B
Kit includes replacement
bracket and screw
64
4-
644
-5
051
A
01A