INSTRUCTION MANUAL CS215 Temperature and Relative Humidity Probe Revision: 8/14 C o p y r i g h t © 2 0 0 5 - 2 0 1 4 C a m p b e l l S c i e n t i f i c , I n c .
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Precautions DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE.
Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ................................................................. 1 2. Cautionary Statements ............................................... 1 3. Initial Inspection ......................................................... 1 4. Quickstart .................................................................... 2 5. Overview ...........
Table of Contents Appendices A. Importing Short Cut Code Into CRBasic Editor ... A-1 A.1 Importing Short Cut Code into a Program Editor............................ A-1 A.1.1 CRBasic Datalogger ................................................................. A-1 A.1.2 Edlog ........................................................................................ A-2 B. Example Programs.................................................. B-1 B.1 CRBasic Programs .............................................
Table of Contents Tables 7-1. C-1. D-1. Datalogger Wiring................................................................................ 6 Environmental Tests ........................................................................ C-1 SDI-12 Command and Response Set ..............................................
Table of Contents iv
CS215 Temperature and Relative Humidity Probe 1. Introduction The CS215 Temperature and Relative Humidity Probe is designed for general meteorological and other data logging applications. It uses the SDI-12 communications protocol to communicate with any SDI-12 recorder, simplifying installation and programming. Before using the CS215, please study • • • 2. 3.
CS215 Temperature and Relative Humidity Probe 4. Quickstart Short Cut is an easy way to program your datalogger to measure the CS215 sensor and assign datalogger wiring terminals. Use the following procedure to get started. 2 1. Install Short Cut by clicking on the install file icon. Get the install file from either www.campbellsci.com, the ResourceDVD, or find it in installations of LoggerNet, PC200W, PC400, or RTDAQ software. 2.
CS215 Temperature and Relative Humidity Probe 5. Under the Available Sensors and Devices list, select the Sensors | Meteorological | Relative Humidity & Temperature folder. Select CS215 Temperature & Relative Humidity Sensor. Click to move the selection to the Selected device window. Data defaults to degree Celsius. This can be changed by clicking the Deg C box and selecting Deg F, for degrees Fahrenheit, or K for Kelvin. 6.
CS215 Temperature and Relative Humidity Probe 5. 8. If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC, and the PC to datalogger connection is active, you can click Finish in Short Cut and you will be prompted to send the program just created to the datalogger. 9. If the sensor is connected to the datalogger, as shown in the wiring diagram in step 6, check the output of the sensor in the datalogger support software data display to make sure it is making reasonable measurements.
CS215 Temperature and Relative Humidity Probe 6.1 6.2 Filter Material: Sintered high-density polyethylene, average pore size 13 µm EMC Compliance: Tested and conforms to BS EN61326:2002 Calibration: Sensirion SHT75 sensor element is individually calibrated during manufacture. Temperature Measurement Operating Range: –40 to +70 °C Accuracy: ±0.3 °C at 25 °C ±0.4 °C over 5 to 40 °C ±0.
CS215 Temperature and Relative Humidity Probe 7.1 Wiring to Datalogger TABLE 7-1.
CS215 Temperature and Relative Humidity Probe A Short Cut tutorial is available in Section 4, Quickstart. If you wish to import Short Cut code into either Edlog or CRBasic Editor to create or add to a customized program, follow the procedure in Appendix A.1, Importing Short Cut Code into a Program Editor. Programming basics for CRBasic and Edlog dataloggers are provided in the following sections. Complete program examples for select dataloggers can be found in Appendix B, Example Programs. 7.2.
CS215 Temperature and Relative Humidity Probe 7.3 Installation Locate the sensor over an open, level area at least 9 m (EPA) in diameter. The surface should be covered by short grass or the natural earth surface where grass does not grow. Sensors should be located at a distance of at least four times the height of any nearby obstruction and at least 30 m (EPA) from large paved areas. Sensors should be protected from thermal radiation and adequately ventilated.
CS215 Temperature and Relative Humidity Probe 4. Tighten the collar until it securely grips the probe. 5. Attach the radiation shield to the tripod mast, crossarm, or tower leg using the supplied U-bolt. See FIGURE 7-1 and FIGURE 7-2 for examples of shield mounting. 6. Route the cable to the datalogger, and secure the cable to the mounting structure using cable ties. 41303-5A CS215 Tripod or Tower Mast FIGURE 7-1.
CS215 Temperature and Relative Humidity Probe 8. Operation 8.1 Sensor Measurements CRBasic instruction SDI12Recorder() measures the CS215 sensor using the Start Measurement (aM!), Concurrent Measurement (aC!), or Continuous Measurement (aR!) command. In all cases “a” is the address of the sensor and “!” is the command terminator. The sensor returns two values: temperature in degrees Celsius and relative humidity as a percentage (0 to 100). A measurement is initiated with the aM! or aC! command.
CS215 Temperature and Relative Humidity Probe 8.1.1.2 Edlog Dataloggers The aM! command takes about 700 milliseconds in total to make a measurement from the CS215. If it is included in the main program table (table 1) the program will be delayed for this interval which will limit the maximum scan rate for fast running programs. For Edlog dataloggers, it is possible to put the SDI-12 instruction in table 2, which allows table 1 to interrupt and pause the SDI-12 instruction letting it run other instructions.
CS215 Temperature and Relative Humidity Probe 8.1.3 Power Conservation The CS215 draws less than 70 µA of current between measurements. In most applications, this is insignificant compared to the datalogger and other power uses, so the sensor can be permanently connected. In low-power applications, battery power can be conserved by turning the 12 V supply to the CS215 on just before the measurement (allowing a ‘warm-up’ time of at least 100 ms) and then turning it off afterwards.
CS215 Temperature and Relative Humidity Probe 9.2 Maintenance The CS215 probe requires minimal maintenance. 9.3 • Check the radiation shield monthly to make sure it is free from dust and debris. • Clear the white filter on the end of the sensor of debris. If dirt or salt is engrained into the filter, it should be cleaned with distilled water or replaced. Make sure the filter is connected firmly with your fingers — do not over tighten.
CS215 Temperature and Relative Humidity Probe CAUTION • There are eight holes in the socket, while the element only has four pins. • The element will work when fitted into either side of socket but must be installed in one of the two possible orientations to work. • The correct orientation is with the black molded tip of the element (that contains the sensing components) mounted directly above the center of the socket.
CS215 Temperature and Relative Humidity Probe Sensing part of the element. Printing on this side. Gold colored side of the tip Sensing Element Gold pins Thread for the filter Sensor connector sticking out of the end of the tube Center line of the sensor body and socket FIGURE 9-1.
CS215 Temperature and Relative Humidity Probe Sensing part of element NOT on the center line Center line of the sensor body FIGURE 9-2. Incorrect fit of sensor element (side view) 10. Attributions and References AASC, 1985: The State Climatologist (1985) Publication of the American Association of State Climatologists: Heights and Exposure Standards for Sensors on Automated Weather Stations, v. 9, No. 4 October, 1985. (www.stateclimate.
CS215 Temperature and Relative Humidity Probe Meyer, S. J. and K. G. Hubbard, 1992: Nonfederal Automated Weather Stations and Networks in the United States and Canada: A Preliminary Survey, Bulletin Am. Meteor. Soc., 73, No. 4, 449-457. Weiss, A., 1977: Algorithms for the calculation of moist air properties on a hand calculator, Amer. Soc. Ag. Eng., 20, 1133-1136. WMO, 2008. Guide to Meteorological Instruments and Methods of Observation. World Meteorological Organization No.
CS215 Temperature and Relative Humidity Probe 18
Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: • • How to import a Short Cut program into a program editor for additional refinement How to import a wiring diagram from Short Cut into the comments of a custom program A.1 Importing Short Cut Code into a Program Editor Short Cut creates files that can be imported into either CRBasic Editor or Edlog program editor. These files normally reside in the C:\campbellsci\SCWin folder and have the following extensions: • • • • • • .
Appendix A. Importing Short Cut Code Into CRBasic Editor 5. The program can now be edited, saved, and sent to the datalogger. 6. Import wiring information to the program by opening the associated .DEF file. Copy and paste the section beginning with heading “-Wiring for CRXXX–” into the CRBasic program, usually at the head of the file. After pasting, edit the information such that a ' character (single quotation mark) begins each line.
Appendix B. Example Programs B.1 CRBasic Programs B.1.1 Example CR200(X) Program This example program shows the measurement of a single CS215 and can be used directly with CR200(X) series dataloggers. 'CR200(X) Series Datalogger 'Program measures one CS215 sensor every 30 seconds and stores the average 'temperature and a sample of relative humidity every 10 minutes.
Appendix B. Example Programs B.1.2 Example Program for CR800, CR850, CR1000, CR3000, or CR5000 This program can be used directly with CR800 series, CR1000, CR3000, and CR5000 dataloggers. 'Program measures one CS215 sensor every 5 seconds and stores the average 'temperature and a sample of relative humidity every 10 minutes.
Appendix B. Example Programs B.2 Edlog Program The following example is written for the CR10(X). Programs for the CR500, CR510, and CR23X would be similar. The program below shows a simple example reading a sensor which has been set up with address 0 (the default) and connected to control port 1.
Appendix B.
Appendix C. Environmental Performance This appendix details tests and limitations of the sensor when exposed to extremes of the environment. C.1 Tests to Defined Standards The sensor element has been tested by the manufacturer and found to comply with various environmental test standards as shown in the table below: TABLE C-1. Environmental Tests Environment Norm Results Temperature Cycles JESD22-A104-B –40/+125 °C, 1000 cycles Within Specifications HAST Pressure Cooker JESD22-A110-B 2.
Appendix C. Environmental Performance C.3 Operating Range of RH Element The RH sensor is specified to work over the entire humidity range of 0 to 100% RH for the temperature range –20 to +60 °C. It will give readings over an extended range as shown in FIGURE C-1 (although the electronics of the CS215 probe are not specified to operate beyond +70 °C).
Appendix D. SDI-12 Sensor Support D.1 SDI-12 Command Basics SDI-12 commands have three components: Sensor address (a) – a single character, and is the first character of the command. The default address of zero (0) can be used unless multiple sensors are connected to the same port. Command body (e.g., M1) – an upper case letter (the “command”) followed by alphanumeric qualifiers. Command termination (!) – an exclamation mark. An active sensor responds to each command.
Appendix D. SDI-12 Sensor Support D.1.1 Address Query Command (?!) Command ?! requests the address of the connected sensor. The sensor replies to the query with the address, a. D.1.2 Change Address Command (aAb!) Sensor address is changed with command aAb!, where a is the current address and b is the new address. For example, to change an address from 0 to 2, the command is 0A2!. The sensor responds with the new address b, which in this case is 2. D.1.
Appendix D. SDI-12 Sensor Support The terminal emulator is accessed by navigating to the Datalogger menu in PC200W, the Tools menu in PC400, or the Datalogger menu in the LoggerNet Connect screen. The following examples show how to use LoggerNet software to enter transparent mode and change the SDI-12 address of the sensor. The same steps are used to enter transparent mode with PC200W and PC400 software after accessing the terminal emulator as previously described. D.2.
Appendix D. SDI-12 Sensor Support D.2.2 CR1000 Datalogger Example 1. Connect a CS215 to the CR1000 (see TABLE 7-1). 2. In the LoggerNet Connect screen navigate to the Datalogger menu and select Terminal Emulator. The terminal emulator window will open. In the Select Device menu, located in the lower left-hand side of the window, select the CR1000 station. 3. Click on the Open Terminal button. 4. Press the key until the datalogger responds with the CR1000> prompt.
Appendix D. SDI-12 Sensor Support D.2.3 CR10X Datalogger Example 1. Connect CS215 to the CR10(X) (see TABLE 7-1). 2. Download a datalogger program that contains the SDI-12 Recorder (P105) instruction with valid entries for each parameter. Make sure that parameter 3 of the P105 instruction matches the control port number where the sensor is connected. 3. In the LoggerNet Connect screen navigate to the Datalogger menu and select Terminal Emulator. The terminal emulator window will open.
Appendix D.
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