Model 755A

Instruction Manual

245364-V May 2002

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.

6 Digit LCD Display

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%.

ZERO

 

SPAN

 

PRESS CAL1

PRESS CAL 2

NORM

REC OFFSET

ZERO Adjust

SPAN Adjust

Rosemount Analytical

M o d e l 7 5 5 A

O x y g e n A n a l y z e r

TEST Switch

Figure 1-1. Model 755A Oxygen Analyzer

Rosemount Analytical Inc. A Division of Emerson Process Management

Description and Specifications

1-1