Set The Alarm Switch - Emerson Rosemount 644 with HART Protocol Reference Manual

Reference Manual
00809-0200-4728, Rev SA
3.4.1

Set the alarm switch

Make certain that the alarm switch is set to the desired position before putting the device into operation
to ensure correct function in the instance of a failure.
Without an LCD display
1. Set the loop to manual (if applicable) and disconnect the power.
2. Remove the housing cover.
3. Set the physical hardware alarm switch to the desired position. H indicates High, L indicates Low.
Then reattach the housing cover. See
4. Apply power and set the loop to automatic control.
Figure 3-3. Failure Switch Location
Rosemount 644 Transmitter
A. Alarm switch
Note
If using an LCD Display or LOI, first remove the display by detaching it from the top of the device, set the
switch to the desired position and reattach the display. See
Figure 3-4. Display Connection
Rosemount 644 Transmitter
Installation
Figure 3-3 below for alarm switch location.
Rosemount 644 Field Mount
A
Figure 3-4
Rosemount 644 Field Mount
Installation
for proper display orientation.
July 2018
45