Emerson Rosemount 5081FG, Справочное руководство

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Reference Manual
00809-0100-4882, Rev AB
May 2019
Rosemount 5081FG
1-4
The oxygen analyzer measures net oxygen concentration in the presence of
all the products of combustion, including water vapor. Therefore, it may be
considered an analysis on a “wet” basis. In comparison with older methods,
such as the portable apparatus, which provides an analysis on a “dry” gas
basis, the “wet” analysis will, in general, indicate a lower percentage of
oxygen. The difference will be proportional to the water content of the
sampled gas stream.
System Configuration
The equipment discussed in this manual consists of two major components:
the oxygen probe and the Rosemount 5081 transmitter.
Oxygen probes are available in three length options, providing In-Situ pene-
tration appropriate to the size of the stack or duct. The options on length are
20 in. (508 mm), 26 in. (660 mm), or 38 in. (965 mm).
Rosemount 5081 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 simultaneously pro-
vide 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.
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) Field 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 Rosemount 5081 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.