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Campbell TempVue 20 SDI-12 Product Manual

Pt-100 rtd class a precision, digital air temperature sensor
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PRODUCT MANUAL
TempVue™20
SDI-12
PT-100 RTD Class A Precision, Digital
Air Temperature Sensor
Revision:
11/2023
2023
Copyright © 
Campbell Scientific, Inc.

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Summary of Contents for Campbell TempVue 20 SDI-12

  • Page 1 PRODUCT MANUAL TempVue™20 SDI-12 PT-100 RTD Class A Precision, Digital Air Temperature Sensor Revision: 11/2023 2023 Copyright ©  Campbell Scientific, Inc.
  • Page 2 U.S. standard external power supply details where some information (for example the AC transformer input voltage) will not be applicable for British/European use. Please note, however, that when a power supply adapter is ordered from Campbell Scientific it will be suitable for use in your country.

  • Page 3: Table Of Contents

    Table of contents 1. Introduction 2. Precautions 3. Initial inspection 4. QuickStart 5. Overview 6. Specifications 7. Installation 7.1 Wiring 7.2 Programming 7.2.1 CRBasic programming 7.3 Siting 7.4 Installation in a radiation shield 7.5 Mount the shield 8. Operations 8.1 SDI-12 sensor measurements 8.2 Updating the operation system (OS) using XLOADOS SDI-12 command 9.
  • Page 4 B.1.5 Change address command (aAb!) B.1.6 Start measurement commands (aM!) B.1.7 Start concurrent measurement commands (aC!) B.1.8 Start measurement commands with cyclic redundancy check (aMC! and aCC!) 25 B.1.9 Stopping a measurement command B.1.10 Send data command (aD0! … aD9!) B.2 SDI-12 transparent mode B.2.1 Changing an SDI-12 address B.3 References...

  • Page 5: Introduction

    The sensor comes with a short, attached cable and terminates with an M12 connector, which provides exceptional convenience, environmental protection, and data integrity for use in a variety of applications. The TempVue 20 SDI-12 communicates with a data logger or RTU using the SDI-12 protocol.

  • Page 6: Initial Inspection

    3. Initial inspection Upon receipt of the TempVue 20 SDI-12, inspect the packaging and contents for damage. File damage claims with the shipping company. Immediately check package contents against the shipping documentation. Contact Campbell Scientific about any discrepancies. Table 3-1 (p.

  • Page 7: Quickstart

    1. Open Short Cut and click Create New Program. 2. Double-click the data logger model. 3. In the Available Sensors and Devices box, type TempVue 20 SDI-12. You can also locate the sensor in the Sensors > Temperature folder. Double click the sensor model. SDI-12 Address defaults to 0.
  • Page 8 Click OK after wiring the sensor. 5. Repeat steps three and four for other sensors you want to measure. Click Next. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...
  • Page 9 9. If the sensor is connected to the data logger, check the output of the sensor in the data display in LoggerNet, RTDAQ, or PC400 to make sure it is making reasonable measurements. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 10: Overview

    20-second step response time with an ambient wind speed of only 1 m/s (3.3 ft/s). The TempVue 20 SDI-12 has a maximum measurement uncertainty of only 0.3 K over the entire measurement range of –60 to +60 °C, with only 0.1 Kelvin (K) over the most common temperature range of -40 to +40 °C.

  • Page 11: Specifications

    The WMO guide to Instruments and Observations, Guide no. 8, also uses both Kelvin and Celsius in their recommendation. Regarding resolution of the unit, 1 Kelvin = 1 °Celsius. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 12: Installation

    7.4 Installation in a radiation shield 7.5 Mount the shield 7.1 Wiring Campbell Scientific offers extension cables in lengths up to 10 m, which connect to the TempVue 20 SDI-12 M12 connector. Contact Campbell Scientific if a longer cable is required. Table 7-1 (p.

  • Page 13: Programming

    If multiple SDI-12 sensors are connected to a data logger, Campbell Scientific recommends using separate terminals when possible. However, multiple SDI-12 sensors can connect to the same data logger control (C) or universal (U) terminal. Each must have a unique SDI-12 address. Valid addresses are 0 through 9, a through z, and A through Z.

  • Page 14: Siting

    7.3 Siting The TempVue 20 SDI-12 is intended for air temperature measurements only. The general EPA guidance for standard meteorological stations is to locate the sensor over an open, level area at least 9 m (29.5 ft) in diameter. The surface should be covered by short grass or the natural earth surface where grass does not grow.

  • Page 15: Installation In A Radiation Shield

    When used in the field, the TempVue 20 SDI-12 must be housed in a radiation shield. Compatible radiation shields include the RAD06, RAD10E, and RAD14 unventilated radiation shields and the TS100SS fan-aspirated radiation shield. The white color of these shields reflects solar radiation.

  • Page 16: Mount The Shield

    1/2 to 1 turn. Do not overtighten the nut as you risk damaging the sensor body and also making service of the sensor more difficult in the future. Figure 7-2. Cut away view shows TempVue 20 SDI-12 insertion in a RAD shield 7.5 Mount the shield 1.

  • Page 17: Operations

    8. Operations 8.1 SDI-12 sensor measurements The TempVue 20 SDI-12 measures temperature every 15 seconds. The most recent 5760 measurements (one day worth) are stored in memory to be used to return statistical data. The memory buffer is emptied at power up. All temperatures are returned with 2 decimal places.
  • Page 18 2 = Error reading 4 = Sensor stuck 8 = Sensor error a14CampbellTempVu20 SN=nnnnn Where, nnnnn = serial number 1. Hardware revision 2. Software revision 3. Uptime in seconds 4. Supply voltage TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 19: Updating The Operation System (Os) Using Xloados Sdi-12 Command

    CR1000X: OS 5.0 or newer CR300 series: OS 10.05 or newer The XLOADOS! OS update process requires access to the data logger terminal. Campbell Scientific Device Configuration Utility is recommended. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...
  • Page 20 Identify the SDI-12 address of the sensor by typing ?! at the prompt. c. Verify that the responding sensor is the TempVue 20 SDI-12 that you want to update by using the SDI-12 verify command aI!.

  • Page 21: Maintenance And Troubleshooting

    Allow the shield to dry before remounting. Ensure the TempVue 20 SDI-12 probe is clean and free of dirt or any soiling by wiping carefully with a lint free cloth and warm soapy water.

  • Page 22: Troubleshooting

    EPA, 2008: Quality Assurance Handbook for Air Pollution Measurement Systems, Vol. IV, Meteorological Measurements, Ver. 2.0, EPA-454/B-08-002 (revised 2008). Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 23: Appendix A. Importing Short Cut Code Into Crbasic Editor

    Block. This adds an apostrophe (') to the beginning of each of the highlighted lines, which instructs the data logger compiler to ignore those lines when compiling. The Comment Block feature is demonstrated at about 5:10 in the CRBasic | Features video TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 24: Appendix B. Sdi-12 Sensor Support

    Serial Data Interface at 1200 baud (SDI-12 ) is a protocol developed to simplify sensor and data logger compatibility. Only three wires are necessary—serial data, ground, and 12 V. With unique addresses, multiple SDI-12 sensors can connect to a single SDI-12 terminal on a Campbell Scientific data logger.

  • Page 25: Acknowledge Active Command (A!)

    Command: aI! Response: allccccccccmmmmmmvvvxxx...xx<CR><LF> Where a = sensor address ll = SDI-12 version number (indicates compatibility) cccccccc = 8-character vendor identification vvv = 3 characters specifying the sensor version (operating system) TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 26: Start Verification Command (Av!)

    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. NOTE: Only one sensor should be connected to a particular terminal at a time when changing addresses. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 27: Start Measurement Commands (Am!)

    To use this command, the scan interval should be 10 seconds or less. The response to each command has the form atttn<CR><LF>, where a = the sensor address TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...
  • Page 28 XD0! collecting data from sensor X by issuing the first D command. The sensor immediately responds with the sensor X+1+2+3+4+5<CR><LF> address and the 5 values. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 29: Start Measurement Commands With Cyclic Redundancy Check (Amc! And Acc!)

    When the data logger is issuing concurrent commands (aC! or aCC!), the send data command is issued after the required time TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 30: Sdi-12 Transparent Mode

    Transparent mode is entered while the computer is communicating with the data logger through a terminal emulator program. It is accessed through Campbell Scientific data logger support software or other terminal emulator programs. Data logger keyboards and displays cannot be used.

  • Page 31: Changing An Sdi-12 Address

    4. Select the correct Communication Port and click Connect. 5. Click the Terminal tab. 6. Select All Caps Mode. 7. Press Enter until the data logger responds with the data logger (CR1000X>) prompt. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...
  • Page 32 12. To exit SDI-12 transparent mode, click Close Terminal. NOTE: The transparent mode for the Granite-series, CR6, CR3000, CR800-series, CR300-series data loggers is similar to that shown for the CR1000X. TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...

  • Page 33: References

    B.3 References SDI-12 Support Group. 2017 "SDI-12: A Serial-Digital Interface Standard for Microprocessor-Based Sensors – Version 1.4." River Heights, Utah. https://sdi-12.org/specification TempVue 20 SDI-12 PT-100 Class A, Precision Air Temperature Sensor...
  • Page 34 2. The defect cannot be the result of misuse. 3. The defect must have occurred within a specified period of time; and 4. The determination must be made by a qualified technician at a Campbell Scientific Service Center/ repair facility.
  • Page 35 Campbell Scientific’s Terms, the provisions of Campbell Scientific’s Terms shall prevail. Furthermore, Campbell Scientific’s Terms are hereby incorporated by reference into this Warranty. To view Terms and conditions that apply to Campbell Scientific, Logan, UT, USA, see Terms and Conditions ...
  • Page 36 Please state the faults as clearly as possible. Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment. In support of this policy, when equipment is returned to Campbell Scientific, Logan, UT, USA, it is mandatory that a “Declaration of Hazardous Material and...
  • Page 37 Comply with all electrical codes. Electrical equipment and related grounding devices should be installed by a licensed and qualified electrician. Only use power sources approved for use in the country of installation to power Campbell Scientific devices. Elevated Work and Weather Exercise extreme caution when performing elevated work.
  • Page 38 Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS,...
  • Page 39 Campbell Scientific Regional Offices Australia France Thailand Location: Garbutt, QLD Australia Location: Montrouge, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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