Combined Data Logger and Sensor
Data Loggers and Sensors
Water management sensors measure a range of variables such as water levels and precipitation amounts. They can use different technologies to determine measurements, whether by magnetostrictive, hydrostatic, air bubbler, vibration, rotating paddle, capacitance, optical, ultrasonic or microwave/radar. Sensors vary according to whether the substance being measured is a liquid, semi-liquid or solid. They can measure continuously or at specific points, such as at pre-determined points (such as when levels drop below or rise above certain points).
The type of sensor used depends on the type of substance (i.e. liquid, semi-liquid, or solid), agitation or vibration, density, whether it must detect measurements in a vacuum or under pressure, the temperature, the type of container, the chemical composition of the substance, noise and so on.
Data loggers are electronic devices that record the data collected by the sensor. They are generally small, portable, battery powered and have a microprocessor and internal memory. Some data loggers interface with a remote computer and users then use software to view and analyse the data, while others have a local interface device (e.g. keypad and screen) so it can be used as a stand-alone device.
Combination Loggers and Sensors
Data loggers can receive data from external instruments and sensors, or can come built in with an internal sensor. Those with internal sensors are combination loggers and sensors. Semrad Pty Ltd offers a range of WaterLOG® combination loggers and sensors:
- H-350-XL : a microprocessor controlled pressure sensor / data logger designed for remote operation. Interfaces with data loggers, chart recorders, GOES transmitters, remote displays and telemetry systems. Replacement for mercury manometres.
- H-350 : Pressure measurement system / manometer replacement including keypad display data logger using PCMCIA flash card and GOES radio options.
- DH-21 : H-310 sensor combined with logger and software.
- H-510 : Self-contained shaft encoder with SDI-12 data recorder.