Emerson 3081FG instruction manual System Features

Instruction Manual

IB-106-3081 Rev. 1.5 September 2002

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:

1Rosemount 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.

2Personal 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.

1-4 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management