Reference Manual
00809-0100-4738, Rev DA
May 2006
Rosemount 3095FB
2-11
The best location for the transmitter in relation to the process pipe depends on
the process itself. Use the following guidelines to determine transmitter
location and placement of impulse piping:
•
Keep impulse piping as short as possible.
•
For liquid service, slope the impulse piping at least 1 inch per foot (8
cm per m) upward from the transmitter toward the process connection.
•
For gas service, slope the impulse piping at least 1 inch per foot (8 cm
per m) downward from the transmitter toward the process connection.
•
Avoid high points in liquid lines and low points in gas lines.
•
Make sure both impulse legs are the same temperature.
•
Use impulse piping large enough to avoid friction effects and blockage.
•
Vent all gas from liquid piping legs.
•
When using a sealing fluid, fill both piping legs to the same level.
•
When purging, make the purge connection close to the process taps
and purge through equal lengths of the same size pipe. Avoid purging
through the transmitter.
•
Keep corrosive or hot (above 250 °F [121 °C]) process material out of
direct contact with the sensor module and flanges.
•
Prevent sediment deposits in the impulse piping.
•
Keep the liquid head balanced on both legs of the impulse piping.
•
Avoid conditions that might allow process fluid to freeze within the
process flange.
Consider Housing
Rotation
The electronics housing can be rotated up to 180 degrees (left or right) to
improve field access or to better view the optional LCD display. To rotate the
housing, perform the following procedure:
1.
Loosen the housing rotation set screw using a 5/64-in. hex wrench.
2.
Turn the housing up to 180 degrees to the left or right of its original
(as shipped) position. Do not rotate the housing more than 180
degrees without first performing a disassembly procedure (see
“Disassembly Procedures” on page 5-5). Over-rotation will sever the
electrical connection between the sensor module and the electronics
module.
3.
Retighten the housing rotation set screw.
Set Jumpers
Security
You can prevent changes to the transmitter configuration data with the write
protection jumper. Security is controlled by the security (write protect) jumper
located on the electronics board or display face. Position the jumper on the
transmitter circuit board in the “ON” position to prevent accidental or
deliberate change of configuration data.
If the transmitter write protection jumper is in the “ON” position, the transmitter
will not accept any “writes” to its memory. Configuration changes, such as
digital trim and reranging, cannot take place when the transmitter security is
on.
AC Termination (AC)
The RS-485 bus needs to be terminated once at both ends, and should not be
terminated elsewhere on the bus. Setting the AC TERMINATION (AC) switch
to ON provides AC bus termination.
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