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Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
1-4 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
The Model 3081 Transmitter is a two-wire
transmitter providing an isolated output, 4-
20 mA, that is proportional to the measured
oxygen concentration. A customer-supplied
24 VDC power source is required to simul-
taneously provide power to the electronics
and a 4-20 mA signal loop. The transmitter
accepts millivolt signals generated by the
probe and produces the outputs to be used
by other remotely connected devices. The
output is an isolated 4-20 mA linearized
current.
d. System Features
1. The cell output voltage and sensitivity
increase as the oxygen concentration
decreases.
2. High process temperatures eliminate
the need for external cell heating and
increase cell accuracy.
3. HART communication is standard. To
use the HART capability, you must
have either:
(a) HART Model 275 Communicator
(b) Asset Management Solutions
(AMS) software for the PC
4. Easy probe replacement due to the
light-weight, compact probe design.
5. Remote location of the Model 3081
Transmitter removes the electronics
from high temperature or corrosive
environments.
6. Power is supplied to the electronics
through the 4-20 mA line for intrinsic
safety (IS) purposes.
7. Infrared remote control (IRC) allows
interfacing without exposing the
electronics.
8. An operator can operate and diagnos-
tically troubleshoot the Two-Wire In
Situ Oxygen Analyzer in one of two
ways:
(a) Infrared Remote Control. The IRC
allows access to fault indication
menus on the Model 3081 Trans-
mitter LCD display. Calibration can
be performed from the IRC keypad.
(b) Optional HART Interface. The
Two-Wire In Situ Oxygen Ana-
lyzer’s 4-20 mA output line trans-
mits an analog signal proportional
to the oxygen level. The HART
output is superimposed on the 4-20
mA output line. This information
can be accessed through the
following:
1 Rosemount Model 275 Hand-
held Communicator - The
handheld communicator re-
quires Device Description
(DD) software specific to the
Two-Wire In Situ Oxygen
Analyzer. The DD software
will be supplied with many
Model 275 units but can also
be programmed into existing
units at most Fisher-
Rosemount service offices.
See Section 4, HART/AMS,
for additional HART
information.
2 Personal Computer (PC) -
The use of a personal com-
puter requires AMS software
available from Fisher-
Rosemount.
9. Selected Distributed Control Systems -
The use of distributed control systems
requires input/output (I/O) hardware
and AMS Security codes are provided
to (by infrared remote control) prevent
unintended changes to analyzers adja-
cent to the one being accessed.
10. A calibration check procedure is pro-
vided to determine if the Rosemount
Two-Wire In Situ Oxygen Analyzer is
correctly measuring the net oxygen
concentration in the industrial process.