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Summary of Contents for Apogee Instruments SIF-111
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Page 1: Owner's Manual
OWNER’S MANUAL INFRARED RADIOMETER Models SIF-111, SIF-121, and SIF-1H1 Rev: 28-Oct-2020 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2020 Apogee Instruments, Inc. -
Page 2: Table Of Contents
TABLE OF CONTENTS Owner’s Manual ....................................1 Certificate of Compliance ................................. 3 Introduction ..................................... 4 Sensor Models ..................................5 Specifications ................................... 6 Deployment and Installation ..............................8 Cable Connectors ................................... 10 Operation and Measurement ..............................11 Maintenance and Recalibration ............................. 16 Troubleshooting and Customer Support .......................... -
Page 3: Certificate Of Compliance
EN 50581:2012 Technical documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances Please be advised that based on the information available to Apogee Instruments from the raw material suppliers, the products manufactured by Apogee Instruments do not contain, as intentional additives, any of the restricted materials including cadmium, hexavalent chromium, lead, mercury, polybrominated biphenyls (PBB), polybrominated diphenyls (PBDE). -
Page 4: Introduction
(soil, vegetation, water, snow) temperature measurement in energy balance studies. Apogee Instruments SIF series infrared radiometers consist of a thermopile detector, germanium filter, precision thermistor (for detector reference temperature measurement), and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. -
Page 5: Sensor Models
If you need the manufacturing date of your sensor, please contact Apogee Instruments with the serial number of your sensor. The three SIF FOV options and associated model numbers are shown below (narrow option available in other... -
Page 6: Specifications
SPECIFICATIONS SIF-111-SS SIF-121-SS SIF-1H1-SS Approximate Sensitivity (difference between target and detector 15 µV per C 10 µV per C temperature) Approximately -0.825 to 0.825 mV for at Approximately -0.55 mV to 0.55 mV for a Output from Thermopile temperature difference... - Page 7 Spectral Response Spectral response of SIF series infrared radiometers. Spectral response (green line) is determined by the germanium filter and corresponds closely to the atmospheric window of 8 to 14 µm, minimizing interference from atmospheric absorption/emission bands (blue line) below 8 µm and above 14 µm.
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Page 8: Deployment And Installation
An Apogee Instruments model AM-220 mounting bracket is recommended for mounting the sensor to a cross arm or pole. The AM-220 allows adjustment of the angle of the sensor with respect to the target and accommodates... - Page 9 Field of View The field of view (FOV) is reported as the half-angle of the apex of the cone formed by the target surface (cone base) and the detector (cone apex), as shown below, where the target is defined as a circle from which 98 % of the radiation detected by the radiometer is emitted.
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Page 10: Cable Connectors
CABLE CONNECTORS Apogee started offering in-line cable connectors on some bare-lead sensors in March 2018 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 environmental... -
Page 11: Operation And Measurement
OPERATION AND MEASUREMENT All SIF-100 series radiometers output two signals: a voltage from the thermopile radiation detector (proportional to the radiation balance between target and detector) and a voltage from the thermistor (proportional to the magnitude of the excitation voltage and resistance of thermistor). The voltage output from the thermopile is an electrically-isolated bipolar (polarity is dependent on temperature difference between sensor and target) signal in the microvolt range and requires a high resolution differential measurement. - Page 12 Sensor Calibration Apogee SIF series infrared radiometers are calibrated in a temperature controlled chamber that houses a custom- built blackbody cone (target) for the radiation source. During calibration, infrared radiometers (detectors) are held in a fixture at the opening of the blackbody cone, but are thermally insulated from the cone. Detector and target temperature are controlled independently.
- Page 13 Temperature Measurement with Internal Thermistor 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. 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).
- Page 14 Target Temperature Measurement The detector output from SIF-100 series radiometers follows the fundamental physics of the Stefan-Boltzmann Law, where radiation transfer is proportional to the fourth power of absolute temperature. A modified form of the Stefan-Boltzmann equation is used to calibrate sensors, and subsequently, calculate target temperature: ...
- Page 15 where E is radiance [W m ] detected by the radiometer, E is radiance [W m ] emitted by the Sensor Target target surface, E is radiance [W m ] emitted by the background (when the target surface is outdoors Background the background is generally the sky), and ε...
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Page 16: Maintenance And Recalibration
MAINTENANCE AND RECALIBRATION Blocking of the optical path between the target and detector, often due to moisture or debris on the filter, is a common cause of inaccurate measurements. The filter in SIF series radiometers is inset in an aperture but can become partially blocked in four ways: Dew or frost formation on the filter. -
Page 17: Troubleshooting And Customer Support
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality The radiation detector in Apogee SIF-100 series infrared radiometers is a self-powered device that outputs a voltage signal proportional to the radiation balance between the detector and target surface. A quick and easy check of detector functionality can be accomplished using a voltmeter with microvolt (µV) resolution. -
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 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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