SENSORS

General Description

The Model 3003 Analog Output Evaporation Gauge is used to determine the evaporation rate by measuring the changing water level in an evaporation pan. A standard Class A National Weather Service evaporation pan is recommended.

The instrument consists of a float, pulley, and counterweight attached to a precision 1000-ohm potentiometer mounted through a gear assembly 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 a strip chart recorder, or remotely using HydroLynx Data Transmitters.

Specifications

Gauge

Height	27½ in.
Diameter	8 in.
Base Dimensions	16 in. triangle with leveling screws
Float	4 in. dia. Polystyrene
Cable and Connector	3-pin ms connector
Total System Resolution	0.0098 in. w/ 5096 Trans.

Potentiometer

Accuracy	1%
Rotation	Continuous
Resistance	1000 ohms
Operating temperatures	-40 to 60 °C
Linearity	0.25%
Range	0-10 in.
Water Input Port	½ in. NP coupling, female
Weight	7½ lbs.
Shipping Weight	30 lbs.

MODEL 3003 Analog Output Evaporation Gauge