Apogee Instruments SIL-111 Owner'S Manual Download Page 1

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APOGEE INSTRUMENTS, INC. |

721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA

TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM

OWNER’S MANUAL

COMMERCIAL INFRARED

RADIOMETER

Models SIL-111

Rev: 8-Jun-2022

Summary of Contents for SIL-111

Page 1: ... 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 COMMERCIAL INFRARED RADIOMETER Models SIL 111 Rev 8 Jun 2022 ...

Page 2: ...Certificate of Compliance 3 Introduction 4 Sensor Models 5 Specifications 6 Deployment and Installation 8 Operation and Measurement 10 Maintenance and Recalibration 16 Troubleshooting and Customer Support 17 Return and Warranty Policy 19 ...

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 polybrominated...

Page 4: ...on of icing conditions and terrestrial surface soil vegetation water snow temperature measurement in energy balance studies Apogee Instruments SIL 111 infrared radiometers consist of a thermopile detector germanium filter precision thermistor for detector reference temperature measurement signal processing circuitry mounted in an anodized aluminum housing and a cable to connect the sensor to a mea...

Page 5: ...SIL 411 SDI 12 A sensor s model number and serial number are located on a label near the pigtail leads on the sensor cable If you need the manufacturing date of your sensor please contact Apogee Instruments with the serial number of your sensor ...

Page 6: ...om 55 to 55 C Output from Thermistor 0 to 2500 mV typical depends on input voltage Input Voltage Requirement 2500 mV excitation typical other voltages can be used Calibration Uncertainty 0 to 50 C when target and detector temperature are within 20 C 0 5 C Measurement Repeatability Less than 0 05 C Stability Long term Drift Less than 2 change in slope per year when germanium filter is maintained in...

Page 7: ...d corresponds closely to the atmospheric window of 8 14 µm minimizing interference from atmospheric absorption emission bands blue line below 8 µm and above 14 µm Typical terrestrial surfaces have temperatures that yield maximum radiation emission within the atmospheric window as shown by the blackbody curve for a radiator at 28 C red line ...

Page 8: ...ng unwanted surfaces objects in the field of view thereby averaging unwanted temperatures with the target temperature see Field of View below Once mounted the green cap must be removed The green cap can be used as a protective covering for the sensor when it is not in use An Apogee Instruments model AM 250 mounting bracket is recommended for mounting the sensor to a cross arm or pole The AM 250 al...

Page 9: ...ngle in relation to the target will determine target area Different mounting geometries distance and angle combinations produce different target shapes and areas as shown below Model Half Angle Mounting Height m FOV Area m 0 45 60 SIL 111 22 1 0 0 51 1 90 11 26 SIL 111 22 2 0 2 05 7 58 45 0 SIL 111 22 3 0 4 62 17 1 101 3 A simple FOV calculator for determining target dimensions based on infrared r...

Page 10: ...itation 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 The voltage output from the thermistor can be measured with a single ended measurement In order to maximize measurement ...

Page 11: ...ixture at the opening of the blackbody cone but are thermally insulated from the cone Detector and target temperature are controlled independently At each calibration set point detectors are held at a constant temperature while the blackbody cone is controlled at temperatures below 10 C above 10 C and equal to the detector temperature The detector temperatures are 10 25 and 40 Data are collected a...

Page 12: ...vity Increasing the excitation voltage will increase thermistor measurement sensitivity but will also increase self heating and current drain The internal thermistor provides a temperature reference for calculation of target temperature Resistance of the thermistor changes with temperature Thermistor resistance RT in Ω is measured with a half bridge measurement requiring an excitation voltage inpu...

Page 13: ...tion process m and b are determined at each detector temperature set point 15 C increments across a 10 C to 40 C range by plotting measurements of TT 4 TD 4 versus mV The derived m and b coefficients are then plotted as function of TD and second order polynomials are fitted to the results to produce equations that determine m and b at any TD 0 C T 1 C T 2 C m D 2 D 2 0 C T 1 C T 2 C b D 2 D 3 Wher...

Page 14: ...ation emission actual radiation emission to blackbody radiation emission at the same temperature theoretical maximum for radiation emission Unless the target surface is a blackbody ε 1 emits and absorbs the theoretical maximum amount of energy based on temperature Esensor will include a fraction 1 ε of reflected radiation from the background Since temperature rather than energy is the desired quan...

Page 15: ...d 3 is a reasonable approximation ε for most terrestrial objects does not vary significantly in the 8 14 µm waveband and the background radiation is a small fraction 1 ε of the measured radiation because most terrestrial surfaces have high emissivity often between 0 9 and 1 0 To apply Eq 3 the brightness temperature of the background TBackground must be measured or estimated with reasonable accura...

Page 16: ... are best removed with deionized water rubbing alcohol or in extreme cases acetone The plastic radiation shield should be removed if acetone is used to clean the filter as it can be damaged by acetone 4 Spiders insects and or nests in the aperture leading to the filter If spiders insects are a problem repellent should be applied around the aperture entrance not on the filter Clean inner threads of...

Page 17: ...meter to the red and blue wires from the sensor The resistance should be the sum of the resistances measured across the green and white wires and green and blue wires e g 10 kΩ plus 24 9 kΩ at 25 C Compatible Measurement Devices Dataloggers Controllers Meters SIL 111 radiometers have sensitivities in the microvolt range approximately 60 µV per C difference between target and detector Thus a compat...

Page 18: ...re SIL 111 radiometers are being used in close proximity to communications near an antenna or antenna wiring it may be necessary to alternate the data recording and data transmitting functions i e measurements should not be made when data are being transmitted wirelessly If EMI is suspected place a tinfoil cap over the front of the sensor and monitor the signal voltage from the detector The signal...

Page 19: ...factory The warranty does not cover equipment that has been damaged due to the following conditions 1 Improper installation use 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 nominal accuracy drift is normal over time Routine recalibration...

Page 20: ...smanship 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 apogeeinstruments com to discuss repair or replacement options O...

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