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Summary of Contents for Apogee SO-110
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Page 1: Owner's Manual
OWNER’S MANUAL OXYGEN SENSOR Models SO-110, SO-120, SO-210, and SO-220 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2016 Apogee Instruments, Inc. -
Page 2: Table Of Contents
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 .................................... -
Page 3: Certificate Of Compliance
(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. -
Page 4: Introduction
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... -
Page 5: Sensor Models
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. -
Page 6: Specifications
SPECIFICATIONS SO-100 Series SO-200 Series Measurement Range 0 to 100 % O Sensitivity (approximations) 2.6 mV per % O 0.6 mV per % O Output at 0 % O 6 % of output at 20.95 % O 3 % of output at 20.95 % O Measurement Repeatability less than 0.1 % of mV output at 20.95 % O Non-linearity... -
Page 7: Deployment And Installation
This orientation allows better contact between the electrolyte and signal processing circuitry. Apogee oxygen sensors are resistant to 2.7 G of shock, but vibration may influence sensor sensitivity and should be minimized. -
Page 8: Operation And Measurement
Yellow: 12 V port (positive lead for heater) Blue: Ground (negative lead for heater) The oxygen sensor models with a thermistor for reference temperature measurement, SO-110 and SO-210, are recommended. Thermistors only use a single-ended datalogger channel (thermocouples use a differential channel) and do not require temperature measurement of the datalogger wiring panel (thermocouples require reference, or cold junction, temperature measurement, in addition to measurement of voltage from the thermocouple). - Page 9 SO-120 and SO-220 Series (type-K thermocouple for sensor reference temperature measurement) Red: High side of differential channel (positive lead for O sensor) Black: Low side of differential Channel (negative lead for O sensor) Green: 12 V port (positive lead for heater) Clear: Analog ground (shield wire) White: Ground (negative lead for heater) Yellow: High side of differential channel (positive...
- Page 10 The output of Apogee oxygen sensors is a linear function of absolute oxygen concentration. A simple linear calibration is generally used to derive a calibration factor used to convert sensor output to relative oxygen concentration. The calibration factor (CF, in kPa O ) is derived by dividing ambient oxygen partial pressure (21.23 kPa at sea level assuming standard...
- Page 11 E is elevation [m]. In order to make a barometric pressure correction on gas measurements, it must be continuously measured as it changes over time (see Apogee webpage for a barometric pressure sensor that can be used for continuous measurements of barometric pressure: http://www.apogeeinstruments.com/barometric-pressure/).
- Page 12 A) Barometric pressure and absolute oxygen concentration at 20 C as a function of elevation. Equation (6) was used to calculate barometric pressure. B) Effect of barometric pressure on apparent relative oxygen concentration. Oxygen sensors respond to absolute oxygen concentration, but are often calibrated to yield relative oxygen concentration.
- Page 13 In practice, equation (7) does not accurately correct for temperature effects because in addition to the ideal gas law temperature effect, sensor electronics are affected by temperature. The combination of these two effects on Apogee oxygen sensors (SO-100 and SO-200 series) was determined from measurements in dry air across a wide temperature range by plotting pressure-corrected apparent oxygen concentration (i.e., measured oxygen concentration before temperature...
- Page 14 Effect of Humidity on Oxygen Concentration: As absolute humidity in the atmosphere increases, water vapor molecules displace and dilute other gas molecules. This causes the signal output of a gas sensor to decrease. The water vapor effect on relative oxygen concentration as a function of relative humidity (RH) and at a constant temperature is a linear decrease with increasing RH, as shown in the figure below.
- Page 15 As with temperature, humidity also causes a slight effect on the sensor electronics. For measurements in soil or saturated air (100 % relative humidity), it is recommended that Apogee oxygen sensors are calibrated in conditions where relative humidity is 100 %. A simple way to accomplish this is to mount the sensor in a sealed chamber over water, with ambient air...
- Page 16 Apogee oxygen sensor mounted in a sealed chamber over water. For measurements in environments where relative humidity is 100 %, sensors should be calibrated in conditions where relative humidity is 100 % in order to account for any humidity effects on sensor electronics.
- Page 17 Heating Sensor with Internal Heater All Apogee oxygen sensors are equipped with an internal resistance heater. The heater is designed to maintain the temperature of the sensing element at approximately 2 C above ambient temperature in condensing (100 % relative humidity) environments (e.g., soil).
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Page 18: Maintenance And Recalibration
6 % of signal output at 20.95 % oxygen. This signal decrease yields increases in calibration factor of approximately 2 and 6 % for SO-100 and SO-200 series sensors, respectively. Long-term stability (output voltage decrease over time) of Apogee SO-100 and SO-200 series oxygen sensors. The response time and signal decrease for... -
Page 19: Troubleshooting And Cusotomer Support
Independent Verification of Functionality The oxygen sensing element inside Apogee SO-100 and SO-200 series oxygen sensors is a self-powered device that outputs a voltage signal proportional to partial pressure of gaseous oxygen. A quick and easy check of sensor functionality can be determined using a voltmeter with millivolt (mV) resolution. -
Page 20: Return And Warranty Policy
RETURN AND WARRANTY POLICY RETURN POLICY Apogee Instruments will accept returns within 30 days of purchase as long as the product is in new condition (to be determined by Apogee). Returns are subject to a 10 % restocking fee. WARRANTY POLICY... - Page 21 5. Upon receipt, Apogee Instruments will determine the cause of failure. If the product is found to be defective in terms of operation to the published specifications due to a failure of product materials or craftsmanship, Apogee Instruments will repair or replace the items free of charge.
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