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Summary of Contents for Apogee SN-500
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Page 1: Owner's Manual
OWNER’S MANUAL NET RADIOMETER Model SN-522-SS 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 ..................................4 Specifications ................................... 6 Deployment and Installation ..............................8 Cable Connectors ..................................9 Operation and Measurement ..............................9 Maintenance and Recalibration ............................. 15 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
Net radiation is a key variable in the surface energy balance and influences turbulent fluxes, including evapotranspiration. Apogee Instruments model SN-522 net radiometers are four-component instruments, with individual upward- and downward-looking pyranometers and pyrgeometers. Each radiometer consists of a thermopile detector and filter mounted in an anodized aluminum housing. -
Page 5: Sensor Models
SN-522 SDI-12 SN-500 Apogee Instruments’ four-component net radiometer consists of an upward-looking (model SP-510) and downward-looking (model SP-610) pyranometer (to measure shortwave radiation), and an upward-looking (model SL-510) and downward-looking (model SL-610) pyrgeometer to measure longwave radiation). Each of the individual sensors are available as stand-alone sensors. -
Page 6: Specifications
Apogee model SP-510 transfer standard pyranometers (shortwave radiation reference for upward-looking pyranometer on net radiometer) or to the mean of four Apogee model SP-610 transfer standard pyranometers (shortwave radiation reference for downward-looking pyranometer on net radiometer) under high intensity discharge metal halide lamps. - Page 7 2500 mV excitation (typical, other voltages can be used) Calibration Traceability Apogee SL-510 and SL-610 pyrgeometers are calibrated against the mean of at least two Apogee model SL-510 transfer standard pyrgeometers inside a custom blackbody cone held at multiple fixed temperatures over a range of radiometer (detector and sensor body) temperatures.
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Page 8: Deployment And Installation
DEPLOYMENT AND INSTALLATION An Apogee Instruments model AM-500 mounting bracket can be used to mount the net radiometer to a cross arm. 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 9: 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... -
Page 10: Operation And Measurement
Sensor addresses Each sensor is given an address from 1 to 247. Apogee sensors are shipped with a default address of 1. If using multiple sensors on the same Modbus line, the sensor’s address will have to be changed by writing the Slave... - Page 11 1. The other indexing scheme is called zero-based numbering, where the first register is given the index 0, and is thereby accessed by requesting access to register 0. Apogee Sensors use zero-based numbering. However, if using the sensor in a system that uses one-based numbering, such as using a CR1000X logger, adding 1 to the zero-based address will produce the one-based address for the register.
- Page 12 Read only registers (function code 0x3). Float Registers calibrated shortwave up output Watts calibrated shortwave down output Watts calibrated longwave up output Watts calibrated longwave down output Watts shortwave net Watts longwave net Watts total net radiation albedo shortwave up millivolts shortwave down millivolts longwave up millivolts longwave down millivolts...
- Page 13 longwave down temperature orientation – angle from vertical (degrees) (shifted one decimal point to the left) device status (1 means device is busy, 0 otherwise) firmware version (shifted one decimal point to the left) Read/Write registers (function codes 0x3 and 0x10). Float Registers slave address model number*...
- Page 14 = 1, running average = 1 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 15: Maintenance And Recalibration
Never use an abrasive material or cleaner on the diffuser. Although Apogee sensors are very stable, nominal accuracy drift is normal for all research-grade sensors. To ensure maximum accuracy, we generally recommend sensors are sent in for recalibration every two years, although you can often wait longer according to your particular tolerances. - Page 16 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 17: Troubleshooting And Customer Support
Compatible Measurement Devices (Dataloggers/Controllers/Meters) Any datalogger or meter with RS-232/RS-485 that can read/write float or integer values. An example datalogger program for Campbell Scientific dataloggers can be found on the Apogee webpage at http://www.apogeeinstruments.com/downloads/#datalogger. Cable Length All Apogee sensors use shielded cable to minimize electromagnetic interference. -
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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