255-200 Class A Evaporation Pan
MFR: Novalynx Corp.
The 255-200 Evaporation Pan meets Class A National Weather Service specifications. It is constructed of low carbon type 304 stainless steel. The seams are Heliarc welded for long trouble-free service. A ½" NPT drain opening doubles as a connection point for external Analog Output Evaporation Gauge in automated systems.
Evaporation Gauge in automated systems.
The first procedure for measuring daily evaporation loss is to use a graduated hook gauge set on a still well to determine the level of the water’s surface at each measurement. The second procedure is to use a still well with a fixed point, and each time a measurement is taken, refill the pan with a calibrated graduated cylinder having a surface area 1/100th that of the pan up to the level of the point.
The amount of water added is the equivalent evaporation. Since the amount of evaporation is a function of temperature, humidity, wind, and other conditions, in order to relate the evaporation to current or expected conditions, the maximum and minimum temperature of the water and the amount of air passage are normally recorded along with the evaporation.
Related Products: Water Level Logger PT2X
Specifications
Material: Low carbon stainless steel, type 304, 18 gauge
Construction: Heliarc welded, 1/2" drain plug, NPT female coupling
Size: Cylindrical, inside dimensions 10" deep x 47-1/2" dia (254 mm x 1026 mm), wall thickness 0.047"
Volume: Approx 77 gallons (adding 7.7 gallons will raise water level in pan by 1")
Weight/shipping: 50 lbs/68 lbs (23 kg/31 kg)
Shipping box: 50" x 49" x 11"
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Selecting a site for your evaporation pan.
Evaporation from the pan can be influenced by many factors, making it important to choose the location carefully. At a minimum the site must be level with no trees or buildings that could cast a shadow over the evaporation pan. Do not pave the area or import gravel. Ideally, the area should be sodded or covered by natural vegetation mowed below the level of the pan.
Do not select locations near frequently irrigated fields or lawns, or downwind of spillways where mist may be blown into the pan. The pan should be upwind of large bodies of water such as reservoirs, lakes, ponds or swamps (check weather service information for prevailing wind direction). Enclose the area with a fence to keep animals from drinking from the evaporation pan. A steel link fence, 9 or 11 gauge, a minimum of 4' high, with steel posts set in concrete, is suggested. If the area has problems with small animals or rodents, it may be necessary to bury a barrier and place 18" to 24" of chicken wire (galvanized) along the bottom of the fence. Make sure the fence does not shade the pan. Refer to Appendix B for a Nation Weather Service recommended layout. (Instruction Manual Available On Request)