Fisher 244EH Considerations, General, Mechanical, Electrical, Environmental, Wiring Connections

CONSIDERATIONS

General	Electrical temperature sensors such as RTDs and thermocouples
	produce low-level signals proportional to their sensed temperature. The
	Models 244EH and 244ER transmitters convert the low-level sensor
	signal to a standard 4–20 mA dc signal that is relatively insensitive to
	lead length and electrical noise. This current signal is then transmitted
	to the control room via two wires.
Mechanical	When choosing an installation location and position, take into account
	the need for access to the transmitter.
	Wiring Connections
	Make wiring connections through the cable entry in the side of the
	connection head. Be sure to provide adequate clearance for
	cover removal.
Electrical	Proper electrical installation is necessary to prevent errors due to
	sensor lead resistances and electrical noise. Shielded cable should be
	used in electrically noisy environments.
Environmental	The transmitter electronics module is permanently sealed within the
	housing, resisting moisture and corrosive damage. Verify that the
	operating atmosphere of the transmitter is consistent with the
	appropriate hazardous locations certifications.

1-3