Product Details


Maximum Range 20 feet (6.1 Meters)

The ToughSonic CHEM 20 is an ultrasonic sensor designed for measurement applications involving corrosive chemical liquids or gasses, but it is an excellent choice for benign materials as well. With a maximum range of 20 feet (6.1 meters), it is the mid-range option within the ToughSonic CHEM sensor family.  The sensor is sealed in a PVDF (Kynar®) housingIt’s fully submersible, chemical resistant and shock resistant. The ToughSonic CHEM 20 has a permanently attached, potted-in-place 9-wire cable that allows up to six simultaneous serial, analog and/or switch outputs. It’s fully configurable with SenixVIEW configuration and analysis software.

Please see the whole line of ToughSonic and ToughSonic CHEM sensors for alternative ranges, sizes and housing materials.


ToughSonic CHEM 20 sensors are built Tough with:

  • Chemically resistant PVDF housings.
  • Sealed epoxy potting for IP68 immersion rating and shock resistance.
  • Ruggedized piezoelectric ultrasonic transducer, potted in place.
  • Hardened ToughSonic solid state internal electronics.
  • UV resistant, potted-in, 9-wire cable.


ToughSonic CHEM 20 sensors are built SMART with:

  • SenixVIEW configuration and analysis software that allows you to control more than 60 performance parameters and many viewing, analysis and maintenance options.
  • Up to six simultaneous, industry standard outputs.
  • Multi-sensor network capability built-in.
Maximum Range 20 feet (6.1 meters)
Optimum Range 8 inches - 13 feet (20.3 centimeters - 4 meters)
Temperature -40° to 158° F (-40° to 70° C)
Humidity 0 to 100% operating
Protection NEMA-4X, NEMA-6P, IP68
Transducer Ruggedized piezoelectric
Compensation Temperature compensated
Resolution Digital: 0.0068 in. (0.172 mm); Analog:4099 steps (0-10 VDC), 3279 steps (4-20 mA)
Repeatability Nominal 0.2% of range @ constant temp. Affected by target, distance, environment
Update Rate 5 Hz (100 ms), SenixVIEW adjustable; affected by SenixVIEW filter selections

Specifications are subject to change without notice.

ultrasonic sensor Chem 20 mechanical drawing


Voltage Output 0-10, 0-5 VDC or SenixVIEW customized; 10 mA max.
Current Loop #1 Current sourcing 4-20 mA or SenixVIEW customized, max. loop 450Ω
Current Loop #2 Current sinking 4-20 mA or SenixVIEW customized, max. loop 450Ω
Sinking Switch 150 mA max. @ 40 VDC max., teachable set point & polarity, fault indication
Sourcing Switch 150 mA max. @ input voltage, teachable set point & polarity, fault indication
RS-232, RS-485 Modbus protocol, 9600-115200 baud (selectable), 8 data bits, 1 stop, no parity
SYNC feature Permits up to 32 sensors to operate in close proximity without interference


Mounting 1.5 inch NPT/BSP Universal lower thread. 1 inch NPT upper thread
Attached Cable 6.5 feet (2 meters)
Total Weight 22.6 oz. (0.64 kg)


Serial Interface

The ToughSonic CHEM 20 is available with one of the following Modbus serial data interfaces.

Modbus RS-232 serial data interface
Modbus RS-485 serial data interface