Ultrasonic Modules and Systems
M300-150 Low Cost Liquid Level Sensor
The Massa Model M-300/150 Sensor measures target distances over a range of 4 inches (100 mm) to 7 feet (2.1 meters). It is a member of the Massa M-300 family that includes several models of RoHS compliant CE certified low cost liquid level sensors that produce detection ranges from as close as 4 inches (100 mm) to 13 feet (4 meters). Incorporating state-of-the-art ultrasonic technology, the sensors provide precision non-contact distance measurement for factory automation or industrial process control. The M-300 family of sensors stand out over all other systems because of their affordability, extraordinary ease of operation, genuinely user-friendly software, versatility in user-controlled outputs, and the ability to be set up without using a target. They transmit narrow beam sound pulses at a userselected rate (or they can be software triggered), process return echoes, and produce several outputs dependent on the position of the target.
Operating from 12 to 24 V DC, the M-300/150 Sensor provides a linear output of 0 to 10 V DC, which is proportional to the measured distance to the target. This output voltage range can be easily reprogrammed to start and end anywhere between 0 and 10 V DC. The corresponding target distance span can also be set to start and stop at any two target ranges. In addition, this output voltage can be programmed to operate as a digital switch at a specified target setpoint distance.
The system parameters and outputs are programmable via an RS-485 data link, thereby eliminating problems associated with adjustment potentiometers or pushbuttons. Some additional programmable adjustments include: analog output slope, sampling rate, averaging of multiple distance measurements, loss-of-echo time-out, setpoint hysteresis when operating in the digital switch mode, and a software sensor transmit trigger.
The Model M-300/150 includes an advanced diagnostic feature that will retrieve the ultrasonic waveform for analysis and display it on a computer using the sensor’s software. Users will find this very useful for debugging and correcting more difficult applications without using an oscilloscope.
The M-300/150 Sensor’s user-friendly software operates with MS Windows® operating systems using an RS-232/RS-485 or USB/RS-485 converter. This data link allows up to 32 sensors to be connected in parallel onto the same multi-drop communication network using the supplied protocol. This network also allows users to remotely program their sensors and read target distances for quick integration into their process control application.
Other features include a totally sealed PVC housing containing an industry standard 1 inch NPT fitting for mounting, operation from -20°C to 65°C with built-in temperature compensation, diagnostic and monitoring outputs, and protection from over-voltage, short circuits, and reverse polarity.
* Low Cost
* 1” NPT Mounting Fitting
* Analog or Setpoint Outputs
* Plug & Play Setup – No Target Needed
* Software Set Span and Zero – No Pots or Pushbuttons – Tamperproof Settings
* Easy to Use Setup Software – Windows® 98 /NT/2000/XP SP3 / Vista / 7
* Built-in Temperature/Sound Speed Compensation
* Up to 32 Sensors on RS-485 Multi-drop Network
* Liquid Level Control
* Mechanical Positioning
* Roll Diameter Measurement
* Web Loop Monitoring
* Automatic Filling Operations
* Automatic Packaging
* Bulk Level Control
* Paper/Plastic Film Processing