Emerson 7003M - Manual (Page 13)

Operator Manual
748223-K
June 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-1
Model 7003M
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 electro-
chemical 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.