The 255-100 Analog Output Evaporation Gauge is used to determine the evaporation rate by measuring the changing water level in an evaporation pan.
A standard National Weather Service Class A Evaporation Pan is recommended. The sensor consists of a float, pulley, and counterweight attached to a precision 1000-ohm potentiometer mounted in a weatherproof housing. The triangular base plate is equipped with three leveling screws. The potentiometer produces a resistance output proportional to the position of the float which can be monitored on site using a data logger or remotely by telemetry equipment. The instrument can be placed directly in the pan, or connected to the pan using the 255-100P/F stainless steel pipe and fittings.
| 255-100 Evaporation Gauge | |
| Potentiometer | |
| Accuracy | 0.25% |
| Rotation | Continuous |
| Resistance | 1000 ohms |
| Operating temperatures | -40°C to 60° C |
| Linearity | 0.25% |
| Range | 0-10" |
| System accuracy | Evaporation gauge with pan and pipes ± 0.25% over 10" range |
| Float | 4" diameter |
| Height | 27-1/2" |
| Diameter | 8" |
| Base | 16" triangle with leveling screws |
| Water input port | 1/2" NP coupling, female |
| Cable | 3 conductor, 50' included |
| Weight/Shipping | 7-1/2 lbs/15 lbs |
| Shipping box | 29" x 17" x 16" |
| 255-100-P/F Stainless Steel Pipe & Fittings | |
| Material | 304 stainless steel |
| Dimensions | 60" long, 1/2" NPT fitting |
| Weight/Shipping | 5 lbs/6 lbs |
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