Emerson Rosemount 3095, Reference Manual, Page: 13 / 130

Reference Manual
00809-0100-4716, Rev JA
May 2008
2-3
Rosemount 3095 MultiVariable
Place the shipping containers on a secure bench and open them, taking care
not to damage the contents.
• Review the packing list to verify that all equipment was received.
• Inspect the equipment and report any shipping damage to the carrier.
• See “Exploded View of the Rosemount 3095” on page A-9 to verify
parts
SET THE SWITCHES
Write Protect and Failure
Mode Alarm Jumpers
(HART)
After the transmitter has been configured, the configuration data can be
protected by moving the write protect jumper. When this jumper is installed,
the transmitter does not allow any changes to its configuration memory.
As part of its normal operation, the 3095 continuously monitors its own
operation. The automatic diagnostic routine is a timed series of checks
repeated continuously. If the diagnostic routine detects a failure in a
transmitter, the transmitter drives its output either below 3.75 mA or above
21.75 mA depending on the position of the failure mode jumper.
Both of these jumpers are located on the electronics board just inside the
electronics housing cover (see Figure 2-1). To avoid exposing the transmitter
electronics to the plant environment after installation, set these jumpers
during the commissioning stage on the bench.
When shipped from the factory, the write protect jumper is set to “OFF,” and
the alarm jumper is set to “High” unless specified differently by ordering the
C2 (Custom Configuration) Option Code.
Failure Mode Alarm vs. Saturation Output Values
The failure mode alarm output levels differ from the output values that occur
when applied pressure is outside the range points. When pressure is outside
the range points, the analog output continues to track the input pressure until
reaching the saturation value listed below; the output does not exceed the
listed saturation value regardless of the applied pressure. For example, for
pressures outside the 4–20mA range points, the output saturates at 3.9 mA or
20.8 mA. When the transmitter diagnostics detect a failure, the analog output
is set to a specific alarm value that differs from the saturation value to allow
for proper troubleshooting.
NOTE
The preceding output values can be altered by an analog output
trim procedure.
Use the following steps to change the jumper settings:
Level 4–20 mA Saturation Value 4–20 mA Alarm Value
Low 3.9 mA 3.75 mA
High 20.8 mA 21.75 mA