Evaporation Monitoring System

Model 6529-1, 6529-2, 6529-3

  • Overview

    The Evaporation Monitoring System measures how much water evaporates from a Class A evaporation pan by measuring the water level in an adjoining stillwell. The stillwell reduces fluctuations in the pan’s water level caused by wind.

    The 6529-1 Manual Evaporation System comprises the following components:

    • 6529C Evaporation Pan
    • 6529D Bird and Leaf Cover
    • 6529M Manual Measurement Components

    6529-2 Semiautomatic Evaporation System records water level using a modified Model 6541C-31-C Water Level Instrument that is fitted with a 100mm circumference pulley. This provides measurements with a resolution of 0.5mm. An optional thermistor probe float assembly may be purchased to rest on the surface of the water in the pan to obtain a surface temperature reading.
    WLI also has an LCD display that shows the current depth in the evaporation pan. The stillwell, the measurement system, and water level instrument including LCD display and MicroLogger, are housed in an aluminium enclosure.

    The 6529-2 Semiautomatic Evaporation System comprises the following components:

    • 6529-1 Evaporation Monitoring System Components
    • 6541C-31-C Water Level Instrument with 6541C-L MicroLogger
    • 6541F-115 Float
    • 6541E Floatline
    • 6529G StillWell
    • 6706A Aluminium Enclosure
    • Hardware, hose and reticulation part to connect Evap Pan with the equipment enclosure

    6529-3 Automatic Evaporation System is designed to operate for long periods without maintenance.

    It is similar to the 6529-2 but automatically refills and discharges water from the evaporation pan.
    The unit is supplied with the pressure solenoid, pressure range 0-1000kPa. The high pressure solenoid is used for mains pressure water supplies. The low pressure solenoid is used for gravity fed water supplies.
    Rainfall removed from the pan can be recycled if required. The system also comes with a solar panel and a rechargeable battery system.
    A water temperature sensor and a range of weather sensors can be added to identify the relationship between pan evaporation and site conditions. These are required for evaporation and evapotranspiration studies and modelling.

    Traditional micrologger can be replaced with the Unidata IP telemetry system that can use ether cellular or satellite communication links to monitor data acquisition and operate the site in real time.

    6529-3 Automatic Evaporation system comprises the following components:

    • 6529-2 Evaporation Recording System Components
    • 6529P Evaporation Sys Pump and Pump Housing
    • 6904I-10 10W Solar Panel and Mounting Frame
    • 6907B-7  12V 7.2Ah Battery
    • 6912CR-12 Solar/Pump Controller
    • 6912D-12 Solar Controller
    • Additional hardware, hose and reticulation parts
    • Solenoid 0-1000kPa 12V
  • Specifications

    6529-1
    Range: 0mm to 250mm
    Resolution: 0.5mm
    Pan Type: ID 1208mm, OD 1290mm, Depth 250mm – US Class A compatible
    Pan Mounting: Pine frame 1300mm x 1300mm ISPM 15 Treated IPPC
    Pan Bird Guard: 12mm square steel mesh
    Weight: 31kg (including pallet)

    6529-2
    Range: 0mm to 250mm Pan empty to full
    Resolution: 0.5mm
    Pan Type: ID 1208mm, OD 1290mm, Depth 250mm – US Class A compatible
    Pan Mounting: Pine frame 1300mm x 1300mm ISPM 15 Treated IPPC
    Pan Bird Guard: 12mm square steel mesh
    Accuracy: ±0.4mm.
    Level Reset: Programmable. Default reset to 200mm (±1mm) at a preset time each day
    Water Level: 6541C-31-C Water Level Instrument with Micrologger
    Power Supply: 0.3Ah/day
    Battery: Model 6907B-7  12V, 7.2Ah sealed lead acid
    Solar Panel: Model 6904I-10  12V 10W solar panel
    Control Enclosure (WxDxH)): 320 x 300 x 750mm Aluminium
    System Weight: Approx. 52kg

    6529-3
    Range: 0mm to 250mm Pan empty to full
    Resolution: 0.5mm
    Pan Type: ID 1208mm, OD 1290mm, Depth 250mm – US Class A compatible
    Pan Mounting: Pine frame 1300mm x 1300mm ISPM 15 Treated IPPC
    Pan Bird Guard: 12mm square steel mesh
    Accuracy: ±0.4mm.
    Level Reset: Programmable. Default reset to 200mm (±1mm) at a preset time each day
    Water Level: 6541C-31-C Water Level Instrument with Micrologger
    Power Supply: 0.3Ah/day
    Battery: Model 6907B-7  12V, 7.2Ah sealed lead acid
    Solar Panel: Model 6904I-10  12V 10W solar panel
    Control Enclosure (WxDxH)): 320 x 300 x 750mm Aluminium
    System Weight: Approx. 60kg

  • Ordering Information

    ModelDescription
    6529-1Evaporation Monitoring System
    6529-2Evaporation Recording System
    6529-3Automatic Evaporation Recording System

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  • Documents

    Brochures
    Not applicable.

    Manuals
    Unidata Manual – 6529 Evaporation Monitoring System

    Application Notes
    Evaporation Monitoring

Evaporation System 6529-3 Field Installation