SDI-12 Depth Sensor

Short Description

The pressure transducers of the series MPSDI are designed to measure pressure and water level with high accuracy (better 0.01ft.). The transducers are available either as submersible unit connected to a vented cable for error-free compensation of barometric pressure changes or as thread mount type used e.g. in connection with a bubbler system. The incorporated electronics compensates nonlinearity and also temperature variations in a wide range resulting in an increased overall accuracy.

The SDI-12 compatible serial-digital interface enables output of pressure, level and temperature values as well as the user-specific programming of the sensors in a multidrop bus confuguration. Via the SDI-12-interface, MPSDI pressure sensors can be connected to computers, data loggers etc. by means of a shielded three wire cable Recalibration, free adjustement of offset and measuring-span (scaling) and choice of output-parameters are possible. Low power circuitiy combined with a sleep-mode keeps power consumption down to an absolute minimum.

Advantages

• SDI-12 serial-digital output
• Microprocessor-controlled transducer
• High accuracy (0.05 %)
• Low power consumption
• Temperature compensated
• Environmentally rugged
• High reliability and stability

Applications

• For water well measurements
• Level sensors for small-bore applications
• Measurement of gas pressures
• Pressure / level measurement instorage and run-of-river power stations, water supply plants, sewage treatment plants
• Level mesurements in hydrology (navigation locks, weirs, irrigation plants etc.)

Technical Characteristics

Measuring ranges 0 ... 0.1 bar to 0 ... 50 bar (0 ... 145 psi up to 0 ... 725 psi) Overpressure 3 to 6 times (depending on the range) Accuracy < 0.05% of full scale or 3 mm (0.01 ft) for ranges < 5 m (15 ft) Temperature influence typ. < 30 ppm/ºC of full scale max. < 50 ppm/ºC of full scale Operating temperature -20ºC ... +70ºC (-4ºF ... 158ºF) -38ºC ... +70ºC (-36.4ºF ... 158ºF) optional Communication Bidirectional serial bus, multidrop communication, up to 10 sensors, SDI-12 protocol Overvoltage protection Built-in protector up to 2000 V (transient) Control and Programming Recalibration, free adjustement and choice of output-parameters via data logger or a personal computer (in connection with a SDI-12 to RS232 converter)

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