Fisher Weather Radio 244ER 用户手册

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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.

When choosing an installation location and position, take into account 
the need for access to the transmitter.

Make wiring connections through the cable entry in the side of the 
connection head. Be sure to provide adequate clearance for
cover removal.

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. 

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.