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Apogee Instruments SF-110, Owner'S Manual

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Apogee Instruments SF-110 Owner'S Manual Download 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. 

 

 

 

 

A sensor

’s

 model number and serial number are 

located on a label near the cable connector. If 
you need the manufacturing date of your sensor, 
please contact Apogee Instruments with the 
serial number of your sensor. 

Summary of Contents for SF-110

Page 1: ...ENTS 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 OWNER S MANUAL RADIATION FROST DETECTOR Model SF 110 Rev 20 Jan 2022 ...

Page 2: ...e 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 15 Return and Warranty Policy 16 ...

Page 3: ... 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 lead see note below mercury cadmium hexavalent chromium polybrominated biphenyls PBB polybrominate...

Page 4: ...lance at the surface more longwave radiation is being emitted from the surface than what the surface is absorbing from the clear sky Under cloudy and or windy conditions radiation frost events do not occur Apogee model SF 110 radiation frost detectors are designed to approximate plant leaf temperatures for prediction of frost events SF 110 radiation frost detectors are intended for applications in...

Page 5: ...ace 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 Simulated leaf temperatures reached the freezing point approximately 5 5 hours before air temperature ...

Page 6: ...s mounted into a simulated leaf SF 110 detectors are rugged and weatherproof and are designed to be exposed to ambient environmental conditions A sensor s model number and serial number are located on a label near the cable connector If you need the manufacturing date of your sensor please contact Apogee Instruments with the serial number of your sensor ...

Page 7: ...tation of 2 5 V DC 0 08 C at 5 C maximum assuming continuous input excitation of 2 5 V DC Operating Environment 50 to 70 C 0 to 100 relative humidity Input Voltage Requirement 2 5 V DC excitation recommended see Operation and Measurement section Output Voltage Requirement 2 5 V DC Current Draw 0 1 mA DC at 70 C maximum assuming continuous input excitation of 2 5 V DC Dimensions 17 5 cm length 2 2 ...

Page 8: ...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 slope or tilt to one side is recommended to minimize moisture debris build up on the simulated leaf ...

Page 9: ...e cable If a replacement cable is required please contact Apogee directly to ensure ordering the proper pigtail configuration Alignment When reconnecting a sensor arrows on the connector jacket and an aligning notch ensure proper orientation Disconnection for extended periods When disconnecting the sensor for an extended period from a station protect the remaining half of the connector still on th...

Page 10: ...urement resolution and signal to noise ratio the input range of the measurement device should closely match the output range of the thermistor VERY IMPORTANT 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 measuremen...

Page 11: ...sistance 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 White Therm 1 positive leaf thermistor lead Red Excitation channel excitation for leaf thermistor Black Therm 1 negative leaf thermistor lead Clear Shield Ground ...

Page 12: ...137 White Therm 1 positive leaf thermistor lead Black Therm 1 negative leaf thermistor lead Green Therm 2 positive bud thermistor lead Blue Therm 2 negative bud thermistor lead Red Excitation channel excitation for leaf and bud thermistor Clear Shield Ground White Excitation channel excitation for bud thermistor Black Single ended channel positive leaf thermistor lead Green Single ended channel po...

Page 13: ... Thermistor Resistance to Temperature The thermistor in the simulated leaf has a resistive element where resistance changes with temperature Thermistor resistance RT in Ω is measured with a half bridge measurement requiring an excitation voltage input VEX and a measurement of output voltage VOUT 1 V V 24900 R OUT EX T 1 where 24900 is the resistance of the bridge resistor in Ω From resistance temp...

Page 14: ...s deployed in the field should be periodically cleaned to remove all dust and debris 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 Often ...

Page 15: ...with the excitation voltage and varies as a function of temperature With an excitation voltage of 2 5 V DC the sensitivity is lowest near the ends of the measurement range 50 and 70 C A compatible measurement device e g datalogger or controller should have resolution of at least 0 6 mV in order to produce temperature resolution of less than 0 1 C across the entire temperature measurement range les...

Page 16: ...al reinstallation and shipping of suspected warranty items to our factory The warranty does not cover equipment that has been damaged due to the following conditions 1 Improper installation or abuse 2 Operation of the instrument outside of its specified operating range 3 Natural occurrences such as lightning fire etc 4 Unauthorized modification 5 Improper or unauthorized repair Please note that no...

Page 17: ... specifications due to a failure of product materials or craftsmanship Apogee Instruments will repair or replace the items free of charge If it is determined that your product is not covered under warranty you will be informed and given an estimated repair replacement cost PRODUCTS BEYOND THE WARRANTY PERIOD For issues with sensors beyond the warranty period please contact Apogee at techsupport ap...

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