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Summary of Contents for Apogee Instruments SP-722-SS
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Page 1: Owner's Manual
OWNER’S MANUAL ALBEDOMETER Model SP-722-SS Rev: 1-Jun-2021 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2021 Apogee Instruments, Inc. -
Page 2: Table Of Contents
TABLE OF CONTENTS Owner’s Manual ................................1 Certificate of Compliance ............................3 Introduction ................................4 Sensor Models ............................... 4 Specifications ................................. 6 Deployment and Installation ..........................7 Cable Connectors ..............................8 Operation and Measurement ..........................8 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 rely on the information provided to us by our material suppliers. -
Page 4: Introduction
Apogee Instruments model SP-722 albedometers are two-component instruments, with individual upward- and downward-looking pyranometers. Each albedometer consists of a thermopile detector and diffuser mounted in an anodized aluminum housing. -
Page 5: Sensor Models
Signal Modbus SP-722 Analog SP-710 Apogee Instruments’ two-component albedometer consists of an upward-looking and downward-looking pyranometer (to measure shortwave radiation. Both individual sensors are available as stand-alone sensors. Upward-looking Pyranometer Downward-looking Pyranometer Sensor model number and serial number are located on the bottom of the sensor. If you... -
Page 6: Specifications
247 g Calibration Traceability The pyranometers on Apogee Instruments model SP-722 albedometers are calibrated through side-by-side comparison to the mean of four Apogee model SP-510 transfer standard pyranometers (shortwave radiation reference for upward-looking pyranometer on albedometer) or to the mean of four Apogee model SP-610 transfer standard pyranometers (shortwave radiation reference for downward-looking pyranometer on albedometer) under high intensity discharge metal halide lamps. -
Page 7: Deployment And Installation
DEPLOYMENT AND INSTALLATION An Apogee Instruments model AM-500 or the AM-240 mounting bracket can be used to mount the albedometer to a cross arm. AM-500 AM-240 To minimize azimuth error, the sensor should be mounted with the cable pointing toward true north in the northern hemisphere or true south in the southern hemisphere. -
Page 8: 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 environmental conditions. -
Page 9: Operation And Measurement
OPERATION AND MEASUREMENT The SP-722 has a Modbus output, where the two components of shortwave radiation and albedo are returned in digital format. Measurement of SP-722 albedometers requires a measurement device with a Modbus interface that supports the Read Holding Registers (0x03) function. Wiring White: RS-232 RX / RS-485 Positive Blue: RS-232 TX / RS-485 Negative... - Page 10 Register Index Each register in a sensor represents a value in the sensor, such as a measurement or a configuration parameter. Some registers can only be read, some registers can only be written, and some can be both read and written. Each register exists at a specified index in the table for the sensor.
- Page 11 Read only registers (function code 0x3). Float Registers Incident calibrated output watts Reflected calibrated output watts Incident detector millivolts Reflected detector millivolts Albedo (reflected/incident) Reserved for future use "device status (1 means device is busy, 0 otherwise)" firmware version Integer Registers Incident calibrated output watts (shifted one decimal point to the left) Reflected calibrated output watts...
- Page 12 Running average Heater on/off *Registers marked with an asterisk (*) cannot be written to unless a specific procedure is followed. Contact Apogee Instruments to receive the procedure for writing these registers. Write only registers (function code 0x10). Integer Registers Writing to this register resets Coefficients to firmware defaults.
- Page 13 Packet Framing: Apogee Sensors use Modbus RTU packets and tend to adhere to the following pattern: Slave Address (1 byte), Function Code (1 byte), Starting Address (2 bytes), Number of Registers (2 bytes), Data Length (1 byte, optional) Data (n bytes, optional) Modbus RTU packets use the zero-based address when addressing registers.
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Page 14: Maintenance And Recalibration
MAINTENANCE AND RECALIBRATION Moisture or debris on the filters is a common cause of errors. The upward-looking sensor has a domed housing for improved self-cleaning from rainfall, but materials can accumulate on the diffuser or window (e.g., dust during periods of low rainfall, salt deposits from evaporation of sea spray or sprinkler irrigation water) and partially block the optical path. - Page 15 Homepage of the Clear Sky Calculator. Two calculators are available: One for pyranometers (total shortwave radiation) and one for quantum sensors (photosynthetic photon flux density). Clear Sky Calculator for pyranometers. Site data are input in blue cells in middle of page and an estimate of total shortwave radiation is returned...
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Page 16: Troubleshooting And Customer Support
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality If the sensor does not communicate with the datalogger, use an ammeter to check the current drain. It should be near 37 mA when the sensor is powered. Any current drain significantly greater than approximately 37 mA indicates a problem with power supply to the sensors, wiring of the sensor, or sensor electronics. -
Page 17: 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 18 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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