Posted in | Level Sensors

PulStar® Plus 150 kHz for Continuous Level Monitoring and Process Control

The MassaSonic® PulStar® Series of ultrasonic, rugged sensors are transmitting modules capable of providing reliable constant level or distance measurement of pastes, fluids, or solid bulk materials. PulStar Series Sensors accurately work at application ranges from 4” (100 mm) to 20' (6 m).

The PulStar® Series Sensors include sophisticated ultrasonic technology and processing algorithms, so users can obtain precision non-contact distance measurement for applications such as tank level monitoring, process control, factory automation, or object detection applications.

False echoes due to structure interference are not an issue because of advanced processing algorithms. The PulStar® and PulStar® Plus are the next generation enhancements to Massa’s Legacy M-300 and M-320 product lines, and are fully backward compatible with current M-300/M-320 installations and software.

The new PulStar® sensors are designed for easy mechanical and electronic interface to the control system of an OEM system integrator. These sturdy Sensors are IP68 rated, RoHS and CE compliant, and offered in three versions.

PulStar® Series Sensors have NPT mounting fittings and are offered PVDF or PVC housings for use in various environments. All models are provided with continuous temperature compensation to accomplish precise measurement accuracy. Other easy-to-use features include: diagnostic and monitoring outputs, coupled with protection from short circuits, over voltage, and reverse polarity.

Functioning from 12 to 24 V DC, PulStar® Series Sensors offer user programmable linear outputs of 0 to 10 V DC, 0 to 20 mA, or 4 to 20 mA, which are relative to the measured distance to the target. The output can also be designed to function as a digital switch within zones prescribed by specified target setpoint distances. The PulStar® TTL model operates on UART TTL at 1.8V.

PulStar® Series Sensors are compatible with MS Windows operating systems, and while using USB/RS-485 or RS-232/RS-485 converters, as many as 32 sensors can be connected in parallel onto the same multi-drop communication network. This network also enables users to remotely program their sensors and read target distances for rapid incorporation into control applications.

All PulStar® Sensors are changeable for sampling rate, analog output slope, averaging measurement, setpoint hysteresis, loss-of-echo time-out, and provide a software sensor transmit trigger. PulStar Series Sensors are unique compared to other sensors as their installation is user friendly, and has versatile control options, field proven reliability, and inexpensive cost of ownership.

Key Features

The main features of the PulStar Series Sensors are as follows:

  • Continuous or switch mode
  • Tamperproof and rugged
  • Temperature compensated
  • Plug and play setup
  • Narrow beam and short dead band
  • Up to 32 sensors on RS-485 multi-drop network
  • Many easy user programmable customizations
  • IP68 enclosure rating
  • Economical cost of ownership (CoO)
  • Accurate under demanding environmental conditions


The main applications of the PulStar® Series Sensors are given below:

  • Liquid and solid level control
  • Position detection
  • Bulk material management
  • Tanks, totes, processing
  • Web loop monitoring
  • Roll diameter measurement
  • Automatic packaging operations

Figure 1:PulStar for Waste Monitoring

PulStar® Plus

The PulStar® Plus Sensor offers extra features including: drop down menus to auto change detection settings to disregard false echoes caused by stationary objects in the sound path (mounting tubes or structure elements in a set-up), and contain a high power setting for comprehensive detection range.

Specifications of PulStar® Plus 150 kHz Sensors

The key specifications of the PulStar Plus 150 kHz Sensors are as follows:

Model 150 kHz (Short Range)
PulStar Plus
Minimum Detection Distance 4 inches
(100 mm)
Maximum Detection Distance 9 feet
(2.7 m)
Automatic User Programmable Adjustment of Detection Settings Yes
0 to 10 V DC Analog Output Model Yes
0/4 to 20 mA DC Analog Output Model Yes
Housing Material PVC or PVDF
Mount 1 inch NPT
Operating Temperature Range -40°C to 70°C
Electronic Communication Using a Computer RS-485 data link allowing up to 32 sensors on a multi-drop communication network



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