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OWNER'S MANUAL
HEATED PRECIPITATION
OWNER'S MANUAL
DETECTOR
Model SG-050
Rev: 3-Jan-2025
APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA
TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM
Copyright © 2025 Apogee Instruments, Inc.
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Summary of Contents for Apogee Instruments SG-050
- Page 1 OWNER’S MANUAL HEATED PRECIPITATION OWNER’S MANUAL DETECTOR Model SG-050 Rev: 3-Jan-2025 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2025 Apogee Instruments, Inc.
- Page 2 OWNER’S MANUAL ................................ 1 CERTIFICATE OF COMPLIANCE ........................... 3 INTRODUCTION................................4 DEPLOYMENT AND INSTALLATION ..........................8 OPERATION AND MEASUREMENT ........................... 11 MAINTENANCE AND RECALIBRATION ........................14 TROUBLESHOOTING AND CUSTOMER SUPPORT ..................... 15 RETURN AND WARRANTY POLICY ..........................16...
- Page 4 Precipitation data are required for estimating availability of water resources, determining conditions of road surfaces, forecasting floods, and monitoring droughts. Apogee Instruments heated precipitation detectors are affordable, all-weather precipitation detectors with no moving parts. They use a high accuracy, capacitance circuit to measure permittivity of the top surface mounted on the cell.
- Page 5 Input Voltage Requirement 12 V DC Current Draw 16 to 393 mA Operating Environment -40 to 60 C, 0 to 100% relative humidity Ingress Protection Rating IP67 Mass 50 g Dimensions 6.5 cm diameter, 9.6 mm width, 8.03 cm length Output SDI-12...
- Page 6 The current draw of the SG-050 is dependent on the duty cycle of the heater. The heater activates in response to detected temperature and moisture levels. The heater settings can be adjusted according to the instructions found in the Heating Extended Commands table in the Operation and Measurement Section of this manual.
- Page 7 The following graphs demonstrate current usage at different duty cycles: HPD Current Draw with Heater at 50% Duty Cycle Average Instantaneous Time HPD Current Draw with Heater at 25% Duty Cycle Average Instantaneous Time...
- Page 8 An Apogee Instruments model AM-260 mounting bracket can be used to mount the detector to a cross arm or pole. The AM-260 allows adjustment of the angle of the detector. It is recommended to mount the detector with a slight downward slope or tilting to the side by 20-30 degrees, ideally facing the most common sun direction.
- Page 9 Pins and Wiring Colors All Apogee connectors have six pins, but not all pins are used for every sensor. There may also be unused wire colors inside the cable. To simplify datalogger connection, we remove the unused pigtail lead colors at the datalogger end of the cable.
- Page 10 Tightening Connectors are designed to be firmly finger-tightened only. There is an O-ring inside the connector that can be overly compressed if a wrench is used. Pay attention to thread alignment to avoid cross-threading. When fully tightened, 1-2 threads may still be visible. Disconnection for extended periods When disconnecting the sensor from a station for an extended period, cover the exposed half of the connector on the station with electrical tape or another protective method to shield it from water and dirt.
- Page 11 “!”. SDI-12 language supports a variety of commands. Supported commands for the Apogee Instruments SF-421 are listed in the following table (“a” is the sensor address. The following ASCII Characters are valid addresses: “0-9” or “A-Z”).
- Page 12 Response Example: 014 Apogee SG-0501.0B011234<CR><LF> 014 Apogee SG-0501.0B011234<CR><LF> Serial number: 1234 Board Revision: 01 (‘B’ + 2 characters) Firmware Version Number: 1.0 Sensor Model Number: SG-050 Company Name: Apogee SDI-12 Compatibility Number: 1.4 Sensor Address: 0 Heating Extended Commands Command...
- Page 13 Command Description Example Default aXCOLDDC<+Maximum Sets the maximum duty cycle of 7COLDDC+75! SDI-12 Duty Cycle [%]>! the heater for cold condition address of 7, heating with a range of 0 to maximum duty cycle 100%. If the temperature is of heater 75% for cold below the cold threshold, the condition heating.
- Page 14 The Heated Precipitation Detector will arrive fully calibrated. In dry conditions, the output signal should read close to zero. To verify calibration at any point, completely dry the instrument, then check that its signal falls within the expected signal range. SDI-12 commands can be used to correct data received from an instrument that has an offset baseline reading.
- Page 15 This is particularly important for long lead lengths in electromagnetically noisy environments. The precision bridge resistors are located at the pigtail end of the cable. Thus, the SG-050 cable should not be shortened, otherwise the bridge resistor will be removed.
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Page 16: Return 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 What is Covered All products manufactured by Apogee Instruments are warranted to be free from defects in materials and craftsmanship for a period of four (4) years from the date of shipment from our factory. - Page 17 84321, USA 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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