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- Page 1 OWNER’S MANUAL OXYGEN METER Model MO-200 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 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 ..................................15 Troubleshooting and Customer Support..............................16 Return and Warranty Policy ....................................
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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 MO-200 oxygen meters consists of a handheld meter and a dedicated oxygen sensor connected by cable. The separate sensor consists of a galvanic cell sensing element (electrochemical cell), Teflon membrane, and signal processing circuitry mounted in a polypropylene plastic housing. -
Page 5: Sensor Models
SENSOR MODELS Apogee MO-200 oxygen meter covered in this manual is self-contained and comes complete with handheld meter and sensor. Sensor model number and serial number are located on a label on the backside of the handheld meter. Accessories All Apogee oxygen meters can be purchased with attachments to facilitate measurements in soil/porous media or in-line tubing. -
Page 6: Specifications
SPECIFICATIONS MO-200 Measurement Range 0 to 100 % O Measurement Repeatability ± 0.1 % at 20.9 % O Non-linearity Less than 1 % 2.2 µmol O per day at 20.9 % O and 23 C (galvanic cell sensors consume O... -
Page 7: Deployment And Installation
DEPLOYMENT AND INSTALLATION The sensors on Apogee MO-200 oxygen meters are built with polypropylene plastic housing and are designed to be installed in soil/porous media or sealed chambers, in addition to air. To facilitate the most stable readings, sensors should be mounted vertically, with the opening pointed down and the cable pointed up. -
Page 8: Operation And Measurement
OPERATION AND MEASUREMENT MO-200 oxygen meters are designed with a user-friendly interface allowing quick and easy measurements. To power the meter, slide the included battery (CR2320) into the battery holder, after removing the battery door from the meter’s back panel. The positive side (designated by a “+” sign) should be facing out from the meter circuit board. - Page 9 overwrite the oldest measurement once there are 99 measurements. Every 48 averaged measurements (making a 24 hour period), the meter will record an average daily value. Reset: To reset the meter, in either SMPL or LOG mode, push the mode button twice (RUN should be blinking), then while pressing the down button, press the mode button once.
- Page 10 Therefore, the MO-200 oxygen meters are not calibrated at the factory and must be calibrated by the user. It is recommended to calibrate the MO-200 before taking a series of measurements, or under conditions where drastic changes occur in pressure, temperature, or humidity during subsequent measurements.
- Page 11 A) Barometric pressure and absolute oxygen concentration at 20 C as a function of elevation. Equation (3) 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 12 Effect of temperature on apparent relative oxygen concentration. As with barometric pressure, absolute oxygen concentration, and thus oxygen sensor output, varies with temperature. As temperature changes, relative oxygen concentration remains constant at 20.95 %, but an apparent oxygen change is measured if the temperature correction is not applied to relative measurements.
- Page 13 For measurements in soil or saturated air (100 % relative humidity), it is recommended that the MO-200 is calibrated in conditions where relative humidity is 100 %. A simple way to accomplish this is to mount the sensor in a sealed chamber over...
- Page 14 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.
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Page 15: Maintenance And Recalibration
Life expectancy of the oxygen sensor on the MO-200 oxygen meter is approximately five years of continuous use in 20.95 % oxygen and 20 C. Lifetime can be lengthened by storing the sensor in low oxygen environments and/or in cold temperatures (e.g., fridge) when not in use. -
Page 16: Troubleshooting And Customer Support
Modifying Cable Length Although it is possible to splice additional cable to the separate sensor of the MO-200, note that the cable wires are soldered directly into the circuit board of the meter. Care should be taken to remove the back panel of the meter in order to access the... - Page 17 board and splice on the additional cable, otherwise two splices would need to be made between the meter and sensor head. See Apogee webpage for further details on how to extend sensor cable length: (http://www.apogeeinstruments.com/how- to-make-a-weatherproof-cable-splice/).
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Page 18: 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 19 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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