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Related Manuals for Apogee Instruments SF-110
Summary of Contents for Apogee Instruments SF-110
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Page 1: Owner's Manual
OWNER’S MANUAL RADIATION FROST DETECTOR Model SF-110 Rev: 20-Jan-2022 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2022 Apogee Instruments, Inc. -
Page 2: Table Of Contents
TABLE OF CONTENTS Owner’s Manual ....................................1 Certificate of Compliance ................................. 3 Introduction ..................................... 4 Sensor Models ..................................6 Specifications ................................... 7 Deployment and Installation ..............................8 Cable Connectors ..................................9 Operation and Measurement ..............................10 Maintenance and Recalibration ............................. 14 Troubleshooting and Customer Support .......................... -
Page 3: Certificate Of Compliance
RoHS 3 compliant using exemption 6c. 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 we rely on the information provided to us by our material suppliers. -
Page 4: Introduction
INTRODUCTION In January 2022, the SF-110 (formerly called the leaf and bud temperature sensor) underwent a redesign to improve performance and ruggedness. As part of this redesign, the bud temperature sensor was removed, as it was determined the leaf measurement was most critical. The SF-110 was renamed the radiation frost detector. - Page 5 Simulated leaf (green trace in top panel) temperature from an Apogee model SF-110 compared to air temperature (black trace in top panel) and simulated bud (blue trace in top panel) temperature throughout a clear (net longwave radiation is plotted in middle panel), calm (wind speed is plotted in bottom panel) night during spring in Logan, Utah.
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Page 6: Sensor Models
SF-110 radiation frost detectors use the same precision thermistors as Apogee ST series thermistor temperature sensors, but the thermistor is mounted into a simulated leaf. SF-110 detectors are rugged and weatherproof and are designed to be exposed to ambient environmental conditions. -
Page 7: Specifications
SPECIFICATIONS SF-110 Measurement Range -50 to 70 C 0.1 (from 0 to 70 C); Measurement 0.2 C (from -25 to 0 C); Uncertainty 0.4 C (from -50 to -25 C) Measurement Less than 0.05 C Repeatability Less than 0.02 C per year (when used in non-condensing environments where the annual Long-term Drift average temperature is less than 30 C;... -
Page 8: Deployment And Installation
This ensures the simulated leaf is in the same environment as the actual leaves 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. Mounting the detector with a slight downward... -
Page 9: Cable Connectors
CABLE CONNECTORS Apogee sensors offer cable connectors to simplify the process of removing sensors from weather stations for calibration (the entire cable does not have to be removed from the station and shipped with the sensor). The ruggedized M8 connectors are rated IP68, made of corrosion-resistant marine-grade stainless-steel, and designed for extended use in harsh Inline cable connectors are installed 30 cm from the... -
Page 10: Operation And Measurement
In January 2022, the SF-110 (formerly called the leaf and bud temperature sensor) underwent a redesign to improve performance and ruggedness. As part of this redesign, the bud temperature sensor was removed, as it was determined the leaf measurement was most critical. The SF-110 was renamed the radiation frost detector. Radiation Frost Detector... - Page 11 RADIATION FROST DETECTORS WIRING Wiring for Radiation Frost Detectors (as of January 2022) White: Therm 1 (positive leaf thermistor lead) Red: Excitation channel (excitation for leaf thermistor) Black: Therm 1 (negative leaf thermistor lead) Clear: Shield/Ground Measurement devices (e.g., datalogger, controller) do not measure resistance directly, but determine resistance from a half-bridge measurement, where an excitation voltage is input across the thermistor and an output voltage is measured across the bridge resistor (circuit diagram shown on page 13 is for simulated leaf thermistor).
- Page 12 LEAF AND BUD TEMPERATURE SENSORS WIRING (OLD DESIGN) VERY IMPORTANT: Apogee changed all wiring colors of our bare-lead sensors in March 2018. To ensure proper connection to your data device, please note your serial number then use the appropriate wiring configuration below.
- Page 13 An excitation voltage of 2.5 V DC is recommended to minimize self-heating and current drain, while still maintaining adequate measurement sensitivity (mV output from thermistor per C). However, other excitation voltages can be used. Decreasing the excitation voltage will decrease self-heating and current drain but will also decrease thermistor measurement sensitivity.
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Page 14: Maintenance And Recalibration
The thermistor in SF-110 detectors is not factory calibrated, but it comes with a generic calibration (see Steinhart- Hart coefficients in OPERATION AND MEASUREMENT section). A custom calibration can be derived by comparing the temperature from the simulated leaf thermistor to a reference temperature measurement. -
Page 15: Troubleshooting And Customer Support
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 SF-110 cable should not be shortened, otherwise the bridge resistor will be removed. -
Page 16: 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 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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