Resumen
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.
Leer másVentajas y características
- Dispositivo de bajo consumo para la lectura del nivel de agua en un tanque evaporímetro como por ejemplo el 255-200
- Compatible con todos los datalogger Campbell Scientific (incluso serie CR200(X) )
Imágenes
Descripción detallada
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.
Preguntas frecuentes
Número de FAQs relacionadas con 255-100: 2
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The 255-100 Evaporation Gauge is a potentiometer-type sensor. The 255-100 only draws a few milliamps of power momentarily. If the 255-100 is the only sensor in the system, the data logger has an average power draw of approximately 1 mA.
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The Half Bridge instruction should be selected (not the 3 Wire or 4 Wire options) in Short Cut. The following parameters are data logger specific, but the following can be used on the CR1000 datalogger with the sensor wired to SE1, and Vx1:
How many HalfBr Sensors? 1 Total Bridge Resistance 1000 ohm Excitation Voltage 2500 mV Sensors per excitation channel 1 Range of sensor voltage 2500 mV Reverse Excitation Yes Measurement Integration 50 or 60Hz
Settling Time 20000 µs Multiplier Determined during installation (see manual) Offset Determined during installation (see manual)
Especificaciones
| 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) |