Model 7003M

Operator Manual

748223-K June 2002

SECTION 1

DESCRIPTION AND SPECIFICATIONS

1-1 OVERVIEW

The Model 7003M Percent Oxygen Analyzer continuously monitors the concentration of oxygen in a gaseous sample. It consists of a sensor and the analyzer. The sensor is housed in a chamber assembly and is connected to the analyzer by a shielded multi- conductor cable.

The Model 7003M Percent Oxygen Analyzer provides direct digital readout, isolated current

output, automatic temperature compensation circuitry, and dual relay contact closures for alarms or ON/OFF control devices as standard features. The alarm ranges can be selected independently from the output range, eliminating the need to readjust alarm setpoints if the range is changed.

The analyzer has six modes of operation:

MODE

FUNCTION

RUN (see Section 3-4 on page 3-10)

Normal monitoring

SETUP (see Section 3-5 on page 3-11)

Changing parameters

ALARM/CONTROL (see Section 3-6 on page 3-16)

Set alarms or ON/OFF controllers

CALIBRATION (see Section 4-2 on page 4-1)

Gas calibration/pressure inputs

HOLD (see Section 4-3 on page 4-5)

Retain last output value

DIAGNOSTICS (see Section 4-4 on page 4-8)

Electronics checks

The Model 7003M Percent Oxygen Analyzer is housed in a NEMA 4X (CSA enclosure 4), corrosion resistant housing suitable for panel, pipe or wall mounting.

The analyzer has a microprocessor controlled keyboard for operation. Signals from the remote oxygen and temperature sensors are processed to compute real time oxygen concentration corrected for temperature, constant pressure differences and residual sensor current. The oxygen concentration is compared with user-set alarm parameters, and also generates an isolated 4 to 20 or 0 to 20mA signal. Data is stored in a memory circuit that retains the data in case power is removed.

The analyzer is shipped from the factory configured for operation on either 115 VAC or 230 VAC, 50/60 Hz as specified by the customer when ordered.

1-2 PRINCIPLE OF MEASUREMENT

Measurement is based on the electrochemical reaction between oxygen and the sensor cathode which produces a low level electrical current. The sensor signal is proportional to the partial pressure of oxygen present at the membrane. This signal and a thermistor signal are received by the analyzer and processed by the electronics to output a calibrated oxygen signal that is compensated for temperature.

1-3 SENSORS

Rosemount Analytical offers rechargeable and disposable oxygen sensors which can be used with the Model 7003M. These sensors are supplied in kits: Submersion, in-line flow, fast response, and a cell separation kit. Sensors are available constructed of polypropylene or Ryton. See Section 7- 4REPLACEMENT PARTS - SENSORS on page 7-3, for additional information.

Rosemount Analytical Inc. A Division of Emerson Process Management

Description and Specifications 1-1