Related Manuals for Apogee SI-111
Summary of Contents for Apogee SI-111
- Page 1 MEETINSTRUMENTATIE Turfschipper 114 | 2292 JB Wateringen | Tel. +31 (0)174 272330 | www.catec.nl | info@catec.nl OWNER’S MANUAL INFRARED RADIOMETER Models SI-111, SI-121, SI-131, and SI-1H1 (including SS models)
- Page 2 TABLE OF CONTENTS...
-
Page 3: Certificate Of Compliance
(PBB), polybrominated diphenyls (PBDE). 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 rely on the information provided to us by our material suppliers. - Page 4 (soil, vegetation, water, snow) temperature measurement in energy balance studies. Apogee Instruments SI 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 four FOV options and associated model numbers are shown below:... -
Page 6: Specifications
Calibration Traceability Apogee SI series infrared radiometers are calibrated to the temperature of a custom blackbody cone held at multiple fixed temperatures over a range of radiometer (detector/sensor body) temperatures. The temperature of the blackbody cone is measured with replicate precision thermistors thermally bonded to the cone surface. The precision thermistors are calibrated for absolute temperature measurement against a platinum resistance thermometer (PRT) in a constant temperature bath. - Page 7 Spectral Response Spectral response of SI series infrared radiometers. Spectral response (green line) is determined by the germanium filter and corresponds closely to the atmospheric window of 8-14 µm, minimizing interference from atmospheric absorption/emission above 14 µm. Typical terrestrial surfaces have temperatures that yield maximum radiation emission within the atmospheric window, as shown by the blackbody curve...
-
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 Different mounting geometries (distance and angle combinations) produce different target shapes and areas, as shown below. A simple FOV calculator for determining target dimensions based on infrared radiometer model, mounting height, and mounting angle, is available on the Apogee website:...
-
Page 10: Cable Connectors
(pyranometer pictured) Instructions 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 11: Operation And Measurement
Only the red wire should be connected to a power source. VERY IMPORTANT : Apogee changed all wiring colors of our bare-lead sensors in March 2018 in conjunction with the release of inline cable connectors on some sensors. To ensure proper connection to your data device, please note your serial number or if your sensor has a stainless-steel connector 30 cm from the sensor head then use the appropriate wiring configuration below. - Page 12 Sensor Calibration Apogee SI 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. NOTE: The wiring diagram below is based off the new wiring colors for serial numbers 7283 and above.
- Page 14 Target Temperature Measurement The detector output from SI-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 the background is generally the sky), and ε is the ratio of non-blackbody radiation 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), E will include a fraction (1 –...
-
Page 16: Maintenance And Recalibration
Use only gentle pressure when cleaning the filter with a cotton swab, to avoid scratching the outer surface. The solvent should be allowed to do the cleaning, not mechanical force. It is recommended that infrared radiometers be recalibrated every two years. See the Apogee webpage for details regarding return of sensors for recalibration (http://www.apogeeinstruments.com/tech-support-recalibration-... -
Page 17: Troubleshooting And Customer Support
10 MΩ or higher, there is negligible effect on the radiometer calibration, even after adding up to 50 m of cable. Apogee model SI series infrared radiometers use shielded, twisted pair cable, which minimizes electromagnetic interference. This is particularly important for long lead lengths in electromagnetically noisy environments. - Page 18 Signal Interference Due to the small voltage signals from the detector, care should be taken to provide appropriate grounding for the sensor and cable shield wire, in order to minimize the influence of electromagnetic interference (EMI). In instances where SI-100 series 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).
-
Page 19: 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 20 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.
Need help?
Do you have a question about the SI-111 and is the answer not in the manual?
Questions and answers