Phone: +1 (802) 489-7300      Toll-Free (US & Canada): +1 (800) 677-3649

Maximum Range 35 Feet (10.7 Meters)

ToughSonic CHEM 35 Level Sensor Features

  • Non-contact level measurement
  • Rugged construction, IP68 rated
  • Indoor or outdoor uses
  • Top and bottom mounting threads
  • Five outputs plus serial data
  • Serial data-only models
  • Temperature compensation
  • PC configurable

ToughSonic CHEM 35 Level Sensor Best Applications

  • Chemical tank levels
  • Benign liquid tank levels
  • Tanks up to 35-ft (10.7 m) tall
  • 2 inch NPT or BSP tank fittings

ToughSonic CHEM 35 Level Sensor

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Water / Wastewater

Water Wastewater ToughSonic CHEM 35 Level Sensor


Chemicals ToughSonic CHEM 35 Level Sensor

Tank Level

Tank Level ToughSonic CHEM 35 Level Sensor


by Design

The ToughSonic name says it all:

  • Injection moulded PVDF (Kynar®) for superior chemical resistance
  • Ruggedized piezoelectric ultrasonic transducer, potted in place
  • Hardened & protected solid state electronics
  • UV resistant, potted-in, PUR-jacketed cable
  • All epoxy-potted for wet or dirty applications
  • Short and overload protected outputs
  • IP68 ingress rating (submersible) ∗




Injection moulded PVDF (Kynar) for superior chemical resistance

Kynar® is a registered tradename of Arkema Corporation
∗ Measurement is unreliable when submersed

Sensors can be assembled with custom cables or connectors. Serial data-only models are available for remote monitoring and other serial data-only applications.



ToughSonic sensors have the smarts you need to…

  • easily connect with your equipment
  • includes both analog and switch outputs
  • communicates by serial data
  • optimize the sensor to the application
  • create stand-alone functions
  • duplicate applications without re-calibration

Senix invented PC-configurable “smart sensors” in 1990 and has improved them ever since, giving you get the benefits of years of continuous improvement!

  • Ready out of the box but fully adjustable with SenixVIEW software (included)
  • Connect to a PC serial port or use our USB setup kit
  • Wiring and mounting accessories available


by Wire

Any connection you need…

  • to PLCs, motor drives, displays, PCs – you name it!
  • Universal: one sensor = many applications
  • 2 simultaneous industry standard outputs that are selecting using SenixVIEW software
  • Output #1: 4-20 mA sourcing, or PNP/NPN switch
  • Output #2: 0-10 VDC, or PNP/NPN switch
  • All configurable to the application’s needs

PLUS EVERY ToughSonic Ultrasonic Sensor has serial data for SenixVIEW setup or user application:

  • Choose RS-232 or RS-485 by sensor part number
  • RS-485 recommended unless RS-232 is required
  • Multi-sensor Modbus RS-485 networks
  • Serial data-only models are also available

Connected: To LAN or Cloud

Send liquid levels wirelessly and view them on a LAN    or in the cloud using our new AirWire LoRa transmitter:

  • From in-plant or outdoors up to miles away
  • Low energy, battery powered transmitter
  • Tank levels or outdoor bodies of water
  • Receive high & low level alerts
  • No subscription service charges
  • For low data rate applications
  • No conduit or power required

For more information see the AirWire LoRa page.

Connected: To Senix

  • We talk, too! Call us at 802-489-7300.

Smart. SenixVIEW PC Software

SenixVIEW is included at no charge, runs on a Windows PC and connects to sensors via a serial data port. Our Setup Kits provide everything needed to connect through a USB port, including power supply, sensor-PC interface and cables. SenixVIEW is not required but adds powerful configuration, test and management capability.

  • View sensor measurements graphically in several different ways
  • Over 60 user-adjustable parameters
  • Built-in data logging, graphing, exporting and statistics facilities
  • Save & retrieve setups for maintenance and sensor cloning

Sensor Adjustments Give You More Control 

  • Analogs: Slope, distance endpoints, analog value limits
  • Switches: Setpoints, hysteresis /window features, time delays
  • All Outputs: Power-on, loss of echo, loss of SYNC responses
  • Serial Data: Communications and SYNC modes and functions
  • Measurements: Temperature compensation, sensitivity, data filters, measure rate, gain settings and data processing filters
  • Adjustments: Stored in sensor memory even when power is off

ToughSonic CHEM 35 Variations

Part No.Outputs
LVL-500-4855 + RS-485
LVL-500-485ARS-485 only *
LVL-500-2325 + RS-232
LVL-500-232ARS-232 only *
* Serial data only models have 4-wire (dual-twisted pair) cables


Maximum Range35 feet (10.7 meters)
Optimum Range12 inches to 25 feet
(30.5 cm to 7.6 meters)
Temperature-40° to 158° F (-40° to 70° C)
Humidity0 to 100% operating
ProtectionNEMA-4X, NEMA 6P, IP68
TransducerChemically isolated piezoelectric
CompensationTemperature compensated
SenixVIEW selected options
ResolutionSerial data: 0.0034 in. (0.086 mm)
Analog steps: 4099 (0-10 VDC),
3279 (4-20 mA)
RepeatabilityNominal 0.2% of range @ constant temp. Affected by target, distance, environment
Update Rate20 Hz (50 ms), SenixVIEW adjustable; affected by SenixVIEW filter selections

Specifications are subject to change without notice.


Voltage Output0-10, 0-5 VDC or SenixVIEW customized
Maximum output current 10 mA
Current Loops
(x 2)
Two 4-20 mA current loops:
Current sourcing and current sinking
Max loop resistance 450 ohms each
SenixVIEW customized
Both share calibration parameters
(x 2)
Two switches, SenixVIEW customized
150 mA max @ 40 VDC max
SenixVIEW selected as sinking (NPN) or sourcing (PNP)
Adjustable setpoint, polarity, hysteresis, ON timing, OFF timing
Serial Data InterfaceModbus & streaming protocols
9600-115200 baud (configurable)
8 data bits, 1 stop, no parity
RS-485 permits multi-sensor networks
Part number determines interface


HousingInjection moulded, chemically resistant
Polyvinylidene fluoride (PVDF)
Also known as Kynar, a registered tradename of Arkema Inc.
MountingTop mount: 1-inch NPT (options available)
Bottom: 2 in.straight, fits NPT or BSP
Bottom nut UA-NUT20-PV (order separately)
CablePotted into sensor, pigtail termination
6.5 feet (2 meters), PUR jacketed
Custom lengths available
Standard models: 9-wire shielded + drain
Serial data-only models: 4-wire + drain, dual twisted shielded pair
Weight24.7 oz. (0.70 kg)
Weight includes 6.5 ft (2 meter) cable

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