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Enabling better global research outcomes in soil, plant & environmental monitoring.

Evaporation Monitoring System

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.

Three setups are available:

The 6529-1 Manual Evaporation System is comprised of the following components:

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

The 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.
The 6529-2 Semiautomatic Evaporation System is comprised of 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 parts to connect Evaporation Pan with the equipment enclosure

The 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 6529-3 Automatic Evaporation system is comprised of the following components:

  • 6529-2 Evaporation Recording System Components
  • 6529P Evaporation System 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

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

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 6529-3 operates an evaporation pan and records evaporation and rainfall data. The instrument is normally supplied as a complete package with a US Class A evaporation pan and all installation fittings, but it can be connected to any other type of pan.
The 6529-3 system is designed to operate for long periods without maintenance. The water level instrument and data logger operate for one year from internal batteries and water level control system, refill and discharge of water from the evaporation pan, is solar powered. The water supply to refill the evaporation pan is provided by the user from a tank or a reticulated water supply pipe. Rainfall removed from the pan can be recycled if required.

The datalogger included with the unit is fully programmable and has all the STARLOG features. Some of these are: event and time interval recording, programmable measurement and recording intervals, signal processing such as average, max, min and computations including flow conversions and rating tables.
A water temperature sensor and a range of weather sensors can be added to the system to identify the relationship between pan evaporation and site conditions. These are required for evaporation and evapotranspiration studies and modelling.

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
Material Enclosure: Powder coated aluminium
Size: 320mm x 300mm x 750mm (LxWxH)
Material Pan: Fiberglass
Size: 1208 ID, OD 1290mm x 250mm deep – US Class A compatible
Material Bird Guard: Stainless steel mesh
Size: Dia 1215mm x 210mm deep
Material Pan Mounting: ISPM Treated Pine (IPPC 81gn)
Size: 1300mm x 1300mm x 105mm (LxWxH)
Weight: ~52kg net
Operating temperature: -20°C to 60°C
Range: 30mm to 250mm. Pan empty to full
Resolution: 0.2mm of evaporation or rainfall
Accuracy: ± 0.4mm
Level Reset: Programmable. Default reset to 200mm (± 1mm) at a preset time each day
Water Level: 6541 Water Level Instrument with 512k Micrologger
Power Supply: 0.3Ah/day
6529-3
Material Enclosure: Powder coated aluminium
Size: 320mm x 300mm x 750mm (LxWxH)
Material Pan: Fiberglass
Size: 1208 ID, OD 1290mm x 250mm deep – US Class A compatible
Material Bird Guard: Stainless steel mesh
Size: Dia 1215mm x 210mm deep
Material Pan Mounting: ISPM Treated Pine (IPPC 81gn)
Size: 1300mm x 1300mm x 105mm (LxWxH)
Weight: ~60kg net
Operating temperature: -20°C to 60°C
Range: 30mm to 250mm. Pan empty to full
Resolution: 0.2mm of evaporation or rainfall
Accuracy: ± 0.4mm
Solenoid: 0-1000kPa 12V
Level Reset: Programmable. Default reset to 200mm (± 1mm) at a preset time each day
Water Level: 6541 Water Level Instrument with 512k Micrologger
Power Supply: 0.3Ah/day
Battery: Model 6907B 12V, 7Ah sealed lead acid
Solar Panel: Model 6904I-10 12V, 10W solar panel