Overview - Emerson Rosemount Oxymitter DR Reference Manual

Description and specifications
April 2022
Table 1-2: Calibration Components
Part number
1A99119G01
1A99119G02
1A99119G03
(1) Calibration gas bottles cannot be shipped via air freight.
1.2

Overview

1.2.1 Scope
This Reference Manual provides information needed to install, start up, operate, and
maintain the Rosemount
You can interface the Oxymitter DR to a number of different earlier model electronics
packages. This manual does not cover these electronic packages. For specification
information concerning calibration and operation of the system, refer to the Reference
Manual applicable to your electronics.
1.2.2 Description
Emerson designed the Oxymitter DR to measure the net concentration of oxygen in an
industrial combustion process (i.e., the oxygen remaining after all fuels have been
oxidized).
The probe is permanently positioned within an exhaust duct or stack and performs its task
without a sampling system.
The equipment measures oxygen percentage by reading the voltage developed across a
heated electrochemical cell, which consists of a small yttria-stabilized, zironcia disc. Both
sides of the disc are coated with porous metal electrodes. When operated at the proper
temperature, the millivolt output voltage of the cell is given by the following Nernst
equation:
EM = KT log
Where:
P is the partial pressure of the oxygen in the measured gas on one side of the cell.
2
P is the partial pressure of the oxygen in the reference air on the opposite side of the ce3ll.
1
T is the absolute temperature.
C is the cell constant.
K is an arithmetic constant.
When the cell is at an operating temperature and there are unequal oxygen
concentrations across the cell, oxygen ions will travel from the high oxygen partial
pressure side to the low oxygen partial pressure side of the cell. The resulting logarithmic
10
Description
Calibration gas kit: Contains 0.4% and 8.0% O
(550 L) each (requires two CGA-590 regulators)
Calibration gas regulators kit: Contains two CGA-590 regulators
Bottle rack
™
Oxymitter DR.
(P /P ) + C
10 1 2
Reference Manual
00809-0100-4884
bottles, 145.3 gal.
2
(1)
Emerson.com/Rosemount