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UniData Communication Systems STARLOG 6529 User's Manual Supplement

Automatic evaporation system
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STARLOG
Automatic Evaporation
System
Model 6529
u
User Manual Supplement
6225
nidata
Revision E
February 1, 2001
Copyright Notice
Copyright © Unidata Australia 2001. All rights reserved. No part of this
publication may be reproduced, transmitted, transcribed, stored in a retrieval
system, or translated into any language or computer language, in any form or
by any means, electronic, mechanical, magnetic, optical, chemical, manual or
otherwise, without prior written permission of Unidata Australia, 40 Ladner
St. O'Connor Western Australia 6163.
Printed in Australia
IBM® is a registered trademark of International Business Machines Corp.

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Summary of Contents for UniData Communication Systems STARLOG 6529

  • Page 1 STARLOG Automatic Evaporation Copyright Notice System Copyright © Unidata Australia 2001. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without prior written permission of Unidata Australia, 40 Ladner Model 6529...

  • Page 2: Table Of Contents

    Automatic Evaporation System UNIDATA 5.4.3 Fill System ........26 5.4.4 Drain System .

  • Page 3: Introduction

    Automatic Evaporation System UNIDATA A water temperature sensor and a range of weather sensors can be added to identify the relationship between pan evaporation and site conditions. This is required for evaporation and evapo-transpiration studies and modelling. An INTRODUCTION optional telemetry system can be connected to the datalogger. Landline, cellular, satellite and radio communicationlinks can be used to monitor data and operate the site.

  • Page 4: Superseded Models

    Automatic Evaporation System UNIDATA Example of Logged Data Superseded Models This system supercedes the previous UNIDATA Model 6529-1 instrument. Automating Existing Evaporation Pans The evaporation instrument system and optional weather instruments can be added to any evaporation pan installation. Contact your nearest UNIDATA support office for advice on upgrades.

  • Page 5: Specifications And Details

    Automatic Evaporation System UNIDATA Model 6529M Model 6529E Model 6529D Bird guard Level gauge Drain pump SPECIFICATIONS AND DETAILS Evaporation System Pan Type: US Class A compatible. Range: 30mm to 250mm. Pan empty to full. Resolution: 0.2mm of evaporation or rainfall. Accuracy: +/- 0.4mm Level Reset:...

  • Page 6: Automatic Evaporation Recording

    Automatic Evaporation System UNIDATA Automatic Evaporation Recording Hose: 12.6mm heavy-duty flexible hose, 1.8 metres long. Two stainless steel hose clamps supplied. Model 6706A Aluminium Enclosure Hose guide: PVC pipe, 40m diameter, and 1300mm long. Dimensions: 320mm x 300mm x 750mm (Width x Depth x Height). Vertically sliding front door.
  • Page 7 Automatic Evaporation System UNIDATA Low Pressure Application Low pressure solenoid: GOYEN 10BL2-CNBNT-61D7 direct acting solenoid. Maximum pressure: 70kPa. Minimum pressure: 0kPa. Recommended minimum: 10kPa. Spare parts kits: GOYEN KM1423. Pump: Optional pump (same as drain pump) if gravity feed not possible.

  • Page 8: Evaporation Monitoring Techniques

    Automatic Evaporation System UNIDATA Using Evaporation Pan Data The daily total evaporation can vary from 0 on a cool and misty day, to more than 25mm on a hot, dry and windy day. Care must be taken in extrapolating EVAPORATION MONITORING TECHNIQUES the pan evaporation data to other sites or to estimating losses from natural water bodies.

  • Page 9: Operating Errors

    Automatic Evaporation System UNIDATA UNIDATA recommends no adjustments are normally required. Pan corrosion changes the interior surface colour and texture. The difference between a black painted and unpainted galvanised iron pan is approximately 10%. UNIDATA pans are constructed of white fibreglass to minimise discolouring or deterioration with poor water quality.

  • Page 10: Site Requirements And Layout

    Automatic Evaporation System UNIDATA 6m x 6m fenced enclosure located in full sun with free air flow Water Supply SITE REQUIREMENTS AND LAYOUT Mounting Pole Model 6529E Water Site Requirements For All US Class A Evaporation Pans Level Control System Site requirements are frequently a compromise.

  • Page 11: Low Pressure Supply

    Automatic Evaporation System UNIDATA 4.1.4 Underground Supply Where the water supply is scarce or inconvenient, it is possible to install a tank large enough to be self-sustaining at most sites. Any excess rainfall captured in the pan can be recycled back into the storage tank. A roof over the tank can be used to capture additional rainfall.

  • Page 12: Installing The Equipment

    Automatic Evaporation System UNIDATA Concrete the 40mm galvanised pipe firmly into the ground. Attach the enclosure to the pole using the U-bolts supplied. Face the side with the hole for the stillwell hose toward the pan. Move the enclosure up/down the pole INSTALLING THE EQUIPMENT until the bottom is 20mm below the bottom of the evaporation pan.

  • Page 13: Connect The Stillwell To The Pan

    Automatic Evaporation System UNIDATA Put the stillwell assembly into the enclosure. It stands on the enclosure 5.3.2 Fill The Pan And Set The Water Level Instrument floor at the back. Clamp the stillwell to the bracket with the stainless Fill the pan with water to near the reference point in the pan level gauge. steel hose clamp supplied.

  • Page 14: Install The Water Level Instrument

    Automatic Evaporation System UNIDATA Place the instrument into its final position on the stillwell. Cut-away illustration of float system in stillwell Rotate it to a side-on position. With the floatline installed on both the float pulley and offset pulley, check that the float and counterweight can rise freely from the bottom to the top of the stillwell, without clashing, or touching the sides.

  • Page 15: The Level Control System

    Automatic Evaporation System UNIDATA The Level Control System 5.4.2 Level Control Module 5.4.1 Overview This self contained instrument is normally located near the battery and solenoid or pump. There are no internal settings or adjustments. A cable The purpose of the level control system is to reset the evaporation pan water connects it to the site data logger terminals.

  • Page 16: Drain System

    Automatic Evaporation System UNIDATA A filter is located upstream of the solenoid. This has a removable element to 5.4.6 Installing The Level Control System simplify cleaning. The filter connections suit a 12.5mm (½”) hose from the There is a row of 16 pluggable terminals on the level control module. A strip supply tank.

  • Page 17: Install The Battery And Solar Panel

    Automatic Evaporation System UNIDATA 5.4.8 Install The Fill Solenoid Control Connected Module Remarks Place the solenoid outlet through the front hole of the three at the bottom of Device Terminal the left-hand wall of the cabinet. Attach the hose to the pan, and seal it with a hose clamp.

  • Page 18: Operating The Site

    Automatic Evaporation System UNIDATA 6.2.1 To Adjust The Scheme Details To Suit Your Project Select System from the toolbar and Scheme Editor from the drop-down menu. Start your Starlog system and a list of schemes will be displayed. Select the OPERATING THE SITE 6529E Scheme from the Menu.
  • Page 19 Automatic Evaporation System UNIDATA Select the Program Panel to edit the log interval and other details. The following settings are recommended for a normal project. You may prefer a 15 minute log interval to reduce the volume of logged data. The Program Panel.

  • Page 20: To Start Logging Data

    Automatic Evaporation System UNIDATA The events detail box for event 3 will open. This event sets the reset time You should save it with a scheme name that identifies your site. This scheme when A=B. A is the TOD (Time of Day) and B is the required time. 100 is 1 must be used each time you connect to this data logger.

  • Page 21: To Check Data While Logging Is In Progress

    Automatic Evaporation System UNIDATA To Check Data While Logging Is In Progress Data Recovery And Review Select Scheme Test Mode from the main menu for the scheme. The screen Refer to the software manual for Version 3 Software for detailed descriptions that appears shows complete details of the current logging situation.

  • Page 22: Interpreting Evaporation Data

    Automatic Evaporation System UNIDATA 6.5.1 Interpreting Evaporation Data The following (annotated) graph is an example of typical data from a period, and how it can be interpreted. Three sets of data are logged. The pan water level trace is a full record of all level changes. You can analyse this and extract the evaporation and rainfall data you require.

  • Page 23: Site Visits And Maintenance

    Automatic Evaporation System UNIDATA 7.1.2 Carrying Out The Site Inspection At the site your objectives are to: SITE VISITS AND MAINTENANCE · Recover the recorded data and verify its quality, and · Ensure the site will keep operating correctly and the next period of data The purpose of installing the site is to obtain a continuous and reliable record will be of good quality.

  • Page 24: Reviewing The Data

    Automatic Evaporation System UNIDATA If you notice any problems try and work out what has happened and how to Check that the derived rainfall is sensible and supported by the prevent it reoccurring. evaporation data. Select the ASCII report. The file will be saved in the Starlog\Schemes 7.1.4 Reviewing The Data folder as name.A##.

  • Page 25: Data Processing And Management

    Automatic Evaporation System UNIDATA Take a final look at the instruments and site. Confirm that all is operational, Site Maintenance clean and in good condition, with sufficient water, battery power and logger memory to last until the next scheduled visit. Close up the instrument cabinet 7.3.1 Overview and secure the site.

  • Page 26: Input Water Supply

    Automatic Evaporation System UNIDATA Inspect all hoses and fittings, and the stillwell assembly, for signs of leaks. Repair any problems. 7.3.4 Input Water Supply There is a water filter between the solenoid and the input water supply hose. This is to intercept any fine debris that may prevent the solenoid from closing.

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