Apogee SO-110 User manual

APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA
TEL: [phone] | FAX: [phone] | WEB: APOGEEINSTRUMENTS.COM
Copyright © 2016 Apogee Instruments, Inc.
OWNER’S MANUAL
OXYGEN SENSOR
Models SO-110, SO-120, SO-210, and SO-220

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CONTENTS
Owner’s Manual ................................................................................................................................................................................................................ 1
Certificate of Compliance .................................................................................................................................................................................... 3
Introduction ............................................................................................................................................................................................................. 4
Sensor Models ......................................................................................................................................................................................................... 5
Specifications........................................................................................................................................................................................................... 6
Deployment and Installation.............................................................................................................................................................................. 7
Operation and Measurement............................................................................................................................................................................. 8
Maintenance and Recalibration.......................................................................................................................................................................18
Troubleshooting and Cusotomer Support...................................................................................................................................................19
Return and Warranty Policy ..............................................................................................................................................................................20

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CERTIFICATE OF COMPLIANCE
EU Declaration of Conformity
This declaration of conformity is issued under the sole responsibility of the manufacturer:
Apogee Instruments, Inc.
721 W 1800 N
Logan, Utah 84321
USA
for the following product(s):
Models: SO-110, SO-120, SO-210, SO-220
Type: Oxygen Sensor
The object of the declaration described above is in conformity with the relevant Union harmonization legislation:
2014/30/EU Electromagnetic Compatibility (EMC) Directive
2011/65/EU Restriction of Hazardous Substances (RoHS 2) Directive
Standards referenced during compliance assessment:
EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use – EMC requirements
EN 50581:2012 Technical documentation for the assessment of electrical and electronic products with respect to the
restriction of hazardous substances
Please be advised that based on the information available to us from our raw material suppliers, the products manufactured
by us do not contain, as intentional additives, any of the restricted materials including cadmium, hexavalent chromium, lead,
mercury, polybrominated biphenyls (PBB), polybrominated diphenyls (PBDE).
Further note that Apogee Instruments does not specifically run any analysis on our raw materials or end products for the
presence of these substances, but rely on the information provided to us by our material suppliers.
Signed for and on behalf of:
Apogee Instruments, May 2016
Bruce Bugbee
President
Apogee Instruments, Inc.

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INTRODUCTION
Oxygen (O2) is the second most abundant gas in the atmosphere and is essential to life on Earth. Absolute oxygen
concentration determines the rate of many biological and chemical processes. Oxygen is required for aerobic respiration. In
addition to measurements of absolute oxygen concentration, relative oxygen concentration is also often measured and
reported.
Oxygen sensors are used to measure gaseous or dissolved oxygen. There are multiple different techniques for measuring
gaseous oxygen. Three of the more widely used sensors for environmental applications are galvanic cell sensors, polarographic
sensors, and optical sensors. Galvanic cell and polarographic sensors operate similarly, by electrochemical reaction of oxygen
with an electrolyte to produce an electrical current. The electrochemical reaction consumes a small amount of oxygen. Unlike
polarographic oxygen sensors, galvanic cell sensors are self-powered and do not require input power for operation. Optical
oxygen sensors use fiber optics and a fluorescence method to measure oxygen via spectrometry.
Typical applications of Apogee oxygen sensors include measurement of oxygen in laboratory experiments, monitoring
gaseous oxygen in indoor environments for climate control, monitoring of oxygen levels in compost piles and mine tailings,
and determination of respiration rates through measurement of oxygen consumption in sealed chambers or measurement
of oxygen gradients in soil/porous media. Apogee oxygen sensors are not intended for use as medical monitoring devices.
Apogee Instruments SO-100 and SO-200 series oxygen sensors consist of a galvanic cell sensing element (electrochemical
cell), Teflon membrane, reference temperature sensor (thermistor or thermocouple), heater (located behind the Teflon
membrane), and signal processing circuitry mounted in a polypropylene plastic housing for use in acidic environments, and
lead wires to connect the sensor to a measurement device. Sensors are designed for continuous gaseous oxygen
measurement in ambient air, soil/porous media, sealed chambers, and in-line tubing (flow through applications). SO-100 and
SO-200 series oxygen sensors output an analog voltage that is directly proportional to gaseous oxygen.

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SENSOR MODELS
Apogee Instruments offers four models of oxygen sensors:
The standard response sensor (SO-100 series) is designed for use in soil/porous media. It has a much longer expected lifetime
than the fast response sensor (SO-200 series), which is designed for use in flow through applications.
Accessories
All Apogee oxygen sensors can be purchased with attachments to facilitate measurements in soil/porous media or in-line
tubing.
Model AO-001: Diffusion head designed for measurements in soil/porous media. The diffusion head maintains an air pocket
and provides protection to the permeable Teflon membrane where gas diffusion occurs.
Model AO-002: Flow through head designed for in-line measurements. The flow through head allows connection of tubing
via ¼ inch barbed nylon connectors.
Model
Response
Reference Temperature Sensor
SO-110 Standard Thermistor
SO-120 Standard Type-k thermocouple
SO-210 Fast Thermistor
SO-220 Fast Type-k thermocouple
Sensor model number, serial number, and production
date are located on a label between the sensor and
pigtail lead wires.