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METER PHYTOS 31 Manual

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PHYTOS 31

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Summary of Contents for METER PHYTOS 31

  • Page 1 PHYTOS 31...

  • Page 2: Table Of Contents

    2.1 Installation ....................2 2.2 Connecting ....................3 2.2.1 Connect to METER Data Logger ............4 2.2.2 Connect to a Non-METER Data Logger ..........4 2.3 Interpreting Data ..................6 2.3.1 Understanding Data from METER Data Loggers ....... 6 2.3.2 Understanding Data from Other Data Loggers ......... 7 3.

  • Page 4: Introduction

    1. INTRODUCTION Thank you for choosing the PHYTOS 31 Leaf Wetness Sensor from METER Group. The PHYTOS 31 measures leaf surface wetness by measuring the dielectric constant of the sensor’s upper surface (Section 3.3). It has a very low power requirement, which allows for many measurements over a long period of time with minimal battery usage.

  • Page 5: Operation

    2.1 INSTALLATION The PHYTOS 31 is designed to be deployed either in the canopy or on weather station masts. Follow the steps listed in Table 1 to set up the PHYTOS 31 and start collecting data.

  • Page 6: Connecting

    5 V is 7 to 8 mA. NOTE: The pHYTOS 31 is intended only for use with data loggers and readout devices that can provide short excitation pulses, leaving the sensor turned off most of the time. Continuous excitation not only wastes battery power, but may, under certain circumstances, cause the sensor to exceed government-specified limits on electromagnetic emissions.

  • Page 7: Connect To Meter Data Logger

    Figure 2 Stereo plug connector The PHYTOS 31 comes standard with a 5-m cable. It may be purchased with custom cable lengths for an additional fee (on a per-meter basis). Cable length can be increased up to 40 m without significant signal attenuation.
  • Page 8 Ground (bare) Analog output (orange) Figure 3 pigtail wiring NOTE: LWS (predecessor to pHYTOS 31) may have the older Decagon wiring scheme where the power supply is white, the analog is red, and the bare wire is ground. Power Analog output...

  • Page 9: Interpreting Data

    435 raw counts when dry. When configuring a METER logger port to read the PHYTOS 31, the logger reads the sensor every minute and compares the data to two predefined wetness thresholds of 450 and 460 raw counts to determine the number of...

  • Page 10: Understanding Data From Other Data Loggers

    ® PHYTOS 31 port. • Column 1: The number of minutes that the PHYTOS 31 output was over 450 raw counts in the preceding wake interval. For example, if a 30-min wake interval is selected, then the number can range from 0 (the sensor was never wet during the 30-min period) to 30 (the sensor was always wet during that 30-min period).
  • Page 11 When using a non-METER data logger, it is important to collect data frequently enough to capture changes in the surface wetness.

  • Page 12: System

    PHYTOS 31 3. SYSTEM This section describes the specifications, components, and theory of the PHYTOS 31 Leaf Wetness Sensor. 3.1 SpECIFICATIONS pHYSICAL SpECIFICATIONS Dimensions Length 12.0 cm (4.7 in) Width 5.8 cm (2.3 in) Height 0.8 cm (0.3 in) Operating Temperature Range Minimum –40 °C...

  • Page 13: Components

    (or ice) on the sensor surface. Water on the sensor surface does not need to bridge electrical traces to be detected, as is common with resistance-based surface wetness sensors. This means that the PHYTOS 31 does not need to be painted before use, which eliminates the need for individual sensor calibration.

  • Page 14: Theory

    PHYTOS 31. This is expected and does not affect the sensor function. The surface coating of the PHYTOS 31 is hydrophobic, similar to a leaf with a hydrophobic cuticle. The sensor should match the wetness state of these types of leaves well, but may not match the wetness duration of leaves with plentiful leaf hairs or less waxy cuticles.

  • Page 15: Service

    The sensor should also be cleaned when elevated dry output is detected. Adding UV protectant will extend the service life of the PHYTOS 31 and is highly recommended. The PHYTOS 31 leaf wetness sensor is designed to withstand typical outdoor radiation and precipitation loads for greater than 2 years.

  • Page 16: Customer Support

    +49 89 12 66 52 0 Fax: +49 89 12 66 52 20 Website: metergroup.de If contacting METER by email, please include the following information: Name Email address Address Instrument serial number Phone Description of the problem NOTE: For products purchased through a distributor, please contact the distributor directly for assistance.

  • Page 17: Terms And Conditions

    SERVICE 4.5 TERMS AND CONDITIONS By using METER instruments and documentation, you agree to abide by the METER Group, Inc. USA Terms and Conditions. Please refer to metergroup.com/terms-conditions for details.

  • Page 18: Index

    UV protectant 2, 12, 13 Europe 13–14 North America 13 wiring 3–5 data 6–7 data logger connecting 3–5 METER logger 4, 6–7 non-METER logger 4–5, 7 requirements 10 email 13 installation 2–3 location 2 preparation 2 tools required 2...
  • Page 19 18207-02 10.4.2019 METER Group, Inc. USA 2365 NE Hopkins Court Pullman, WA 99163 T: +1.509.332.2756 F: +1.509.332.5158 E: info@metergroup.com W: metergroup.com METER Group AG Mettlacher Straße 8, 81379 München T: +49 89 12 66 52 0 F: +49 89 12 66 52 20 E: info.europe@metergroup.com W: metergroup.de...

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