255-100
255-100
OrderableAnalog Output Evaporation Gauge
Automated pan evaporation measurement.
Overview
The 255-100, manufactured by Novalynx, determines evaporation rate by measuring the changing water level in your evaporation pan. The evaporation gauge produces a resistance output that Campbell Scientific data loggers can monitor. The 255-200 or another standard National Weather Service Class A evaporation pan must be purchased separately.
Key Advantages
Technical Description
The 255-100 consists of a float, pulley, and counterweight attached to a precision 1000-ohm potentiometer mounted through a gear assembly in a weatherproof housing. It has a triangular base plate equipped with three leveling screws and a bubble level. The potentiometer produces a resistance output proportional to the position of the float, which can be monitored on site using a data logger or monitored remotely by telemetry equipment.
The 255-100 can be placed directly in the pan, or connected to the pan using the 255-100P/F stainless-steel pipe and fittings. Instead of using the 255-100P/F, a 1/2-in. polybraid (fiber reinforced) flexible tubing, nylon fittings (1/2-in. NPT x Hose Bar), and small stainless-steel hose clamps can be used; this equipment is available from a local hardware store.
Benefits
- Compatible with most Campbell Scientific data loggers
- Low-power device for reading the water level of an evaporation pan such as the 255-200
Specifications
- Water Input Port
- 1/2-in. NPT coupling, female
- Counter Weight
- 114 g
(4 oz) stainless steel
- Total Resolution
- 0.76 mm
(0.03 in.)
- Potentiometer Accuracy
- 0.25%
- Rotation
- 360° continuous
- Electrical Angle
- 340°, ±1°
(20° gap)
- Resistance
- 1,000 ohm, ±10%
- Operating Temperature Range
- -40° to +60°C
Evaporation is normally not measured at temperatures below freezing. - Linearity
- 0.25%
- Mechanical Range
- 0 to 254 mm
(0 to 10 in.)
- Electrical Range
- 0 to 240 mm
(0 to 9.44 in.)
- Float
- 10.2 cm
(4 in.) diameter, plastic
- Cable Description
- 3-conductor, 24 AWG, shielded
- Cable Length
- 15 m
(50 ft)
- Diameter
- 203 mm
(8 in.)
- Height
- 700 mm
(27.5 in.)
- Base Dimensions
- 40.6 cm (16 in.) triangle with leveling screws
- Weight
- 3.4 kg
(7.5 lb)
- Shipping Weight
- 6.8 kg
(15 lb)
