Fisher 244ER Old Transmitter, Transmitter Design Sensor Wiring Diagrams Special Mounting, G-Rail

Rosemount Models 244EH and 244ER PC-Programmable Temperature Transmitters

OLD TRANSMITTER

Transmitter Design

Sensor Wiring Diagrams

Special Mounting

Considerations

Models 644H and 244EH Models 644R and 244ER

Two Mounting Holes

	Models 644 and 244E
1 2 3 4	1 2	3 4	1 2 3 4	1 2 3 4	1 2 3 4	-0000B01B
2-wire	3-wire *		RTD with** 4-wire		T/C and
RTD and	RTD		Comp.	RTD	mV
						644
V	and V		Loop	and V

*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.

**The transmitters must be configured for a 3-wire RTD in order to recognize an RTD with a compensation loop.

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			5301B01B,D01B-644
	and attach sufficient lengths of sensor lead wire. Tighten
	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				5051A01A-644
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.
		Kit includes replacement		644-
			bracket and screw

C-2