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Instruction Manual
245364-V
May 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-1
Model 755A
6 Digit LCD Display
ZERO Adjust
Rosemount Analytical
Model 755A
Oxygen Analyzer
PRESS CAL1 PRESS CAL 2
NORM REC OFFSET
SPAN Adjust
TEST Switch
ZERO
SPAN
SECTION 1
DESCRIPTION AND SPECIFICATIONS
1-1 OVERVIEW
The Model 755A Oxygen Analyzer provides
digital readout of the oxygen content of a
flowing gas sample. Oxygen is strongly
paramagnetic; other common gases, with only
a few exceptions, are weakly diamagnetic.
A front panel liquid crystal display provides
direct digital readout of oxygen concentration.
In addition a field-selectable voltage output is
provided as standard. An isolated current
output of 0 to 20 mA or 4 to 20 mA is
obtainable with the optional Current Output
Board. Current and voltage output may be
utilized simultaneously if desired.
The basic electronic circuitry is incorporated
into two master boards: The Control Board
Assembly and the Case Circuit Board
Assembly (see Figure 1-2, page 1-3). The
Control Board has a receptacle which accepts
optional circuit boards, thus permitting
inclusion of such features as current output.
1-2 OXYGEN RANGE ON FRONT PANEL
DIGITAL DISPLAY
The front panel LCD (liquid crystal display)
provides direct readout of oxygen
concentration from 0.00% to 100.00%.
Figure 1-1. Model 755A Oxygen Analyzer