Rosemount Model 3144 and 3244MV Smart Temperature Transmitters
4-4
Disassembling the
Electronics Housing
The transmitter is designed with a dual-compartment housing; one
compartment contains the electronics module, and the other
compartment contains all wiring terminals and the communication
receptacles.
Removing the Electronics
Module
The electronics module of the Model 3144 and 3244MV transmitters is
located in the compartment opposite the wiring terminals (see
Figure 4-1).
Use the following procedure to remove the electronics module.
NOTE
The electronics are sealed in a moisture-proof plastic enclosure referred
to as the electronics module. The module is a non-repairable unit; if a
malfunction occurs the entire unit must be replaced.
1. Disconnect the power to the transmitter.
2. Remove the cover from the electronics side of the transmitter
housing (see Figure 4-1). Do not remove the covers in explosive
atmospheres when the circuit is alive. Remove the LCD meter, if
applicable.
3. Loosen the two screws that anchor the electronics module
assembly to the transmitter housing.
4. Firmly grasp the screws and assembly and pull it straight out of
the housing, taking care not to damage the interconnecting pins.
NOTE
Note the transmitter’s security jumper position (ON or OFF) and the
failure mode jumper position (LO or HI). If you are replacing the
electronics module with a new one, make sure the security switch is set
in the same position.
Transmitter Security and Failure
Mode Jumpers
The transmitter security and failure mode jumpers are located on the
front of the electronics module, as shown in Figure 4-2 on page 4-5. See
“Failure Mode and Security Jumpers” on page 2-7 for more information.
See “Safety Messages” on page 4-1 for complete warning information.