OTC Transmitters


Battery-Powered Self-Contained Water Level Monitoring Solution



  • For water applications only
  • Non-contact, no moving part solution
  • Level reading range: up to 12 ft / 3.4 m
  • Up to a 10-year battery life
  • Advanced local LCD display interface
  • Self-contained, rugged design
  • Installs in minutes
  • IP66, -40 °C to 80 °C (-40 °F to 158 °F)
  • 900 MHz range: Up to 1.4 Miles / 2.3 km with Clear Line of Sight
  • 2.4 GHz range: Up to 1.9 Miles / 3.1 km with Clear Line of Sight
  • Secure AES encryption

Ultrasonic Level Sensor Included

The OleumTech® OTC Wireless Ultrasonic Transmitter does not come in contact with the liquid (product) or have any moving parts that require maintenance. Specifically designed for water applications, the WT-LL6 can measure up to 12 ft of water level with a high resolution of 0.04 inches. The WT-LL6 can be installed easily and quickly with the provided mounting hardware. Additional data such as volume and tank full percentage can be reported as well based on user preference. This ultra-low-power transmitter is powered by a replaceable battery pack that provides up to a 10-year life. The push button LCD interface allows for device configuration and instant access to process data.

Reliable, Scalable and Safe

The field-proven wireless transmitter communicates with an assigned wireless gateway within the OTC Wireless Sensor and I/O Network creating a highly scalable network, accommodating virtually any I/O requirement.

The OleumTech wireless transmitter is designed for general purpose applications


∙ ISM Band, Spread Spectrum
Type: 900 MHz∙ 900 MHz: FHSS, FSK, AES Encryption: 256-bit (900 MHz)
2.4 GHz∙ 2.4 GHz: DSSS, AES Encryption: 128-bit
Bit Rate∙ 900 MHz: 9600 bps / 115.2 kbps; 2.4 GHz: 250 kbps
Output Power (Max)∙ 900 MHz: 10 mW; 2.4 GHz: 63 mW
Receiving Sensitivity∙ 900 MHz: -110 dBm @ 9600 bps, -100 dBm @ 115.2 kbps
∙ 2.4 GHz: -100 dBm @ 250 kbps
RF Range∙ 900 MHz: Up to 7500 Feet / 1.4 Miles / 2.3 km with Clear Line of Sight
∙ 2.4 GHz: Up to 1.9 Miles / 3.1 km with Clear Line of Sight
Device Functionality∙ Liquid Level Sensing Wireless Transmitter Using Ultrasonic Technology
∙ Non-Contact Solution / No Moving Parts
Embedded Controller∙ Ultra-Low Power RISC Microcontroller with Internal FLASH (Field Upgradeable)
Configuration∙ Standard RS232 Serial / BreeZ® Software for PC
Sensor Type∙ Ultrasonic; Non-Submersible
Reading Range∙ Up to 12 ft. / 3.6 m
Dead Band Zone∙ 12" / 1 ft. / 0.3 m
Resolution∙ High Resolution of 0.04" (1 mm)
Power Source∙ Self-Contained, Internal 3.6 Vdc Lithium Battery
Internal Battery Life∙ Up to 10 Years, Based on User Defined Reporting Intervals
Local LCD Display∙ 32-Character Display (16x2 Lines) with 4 Function Keys + Read Button
Instant Displayable Read∙ Product Level / Battery Voltage / RF Status
Local Configuration∙ Integral LCD with Push Button Interface
Device Diagnostics∙ Health Tags: Battery Voltage, Received Signal Strength Indication (RSSI), RF Refresh, RF Timeout, Error Codes
Dimensions∙ 5.5" (W) x 20.2" (H) x 4.4" (D) / 140 mm (W) x 513 mm (H) x 112 mm (D)
Package Dimensions∙ 24" (W) x 10" (H) x 7" (D) / 609mm (W) x 254mm (H) x 153mm (D)
Package Weight∙ ~6 lbs / 2.7 kg
Connection Fitting∙ 1.5" NPT Male Compression Fitting
Enclosure Casing Material∙ Type 4X Aluminum; IP66
EMC/EMI∙ FCC Part 15 (USA), IC ICES-003 (Canada), ACMA (Australia)
∙ AS/NZS CISPR 32 (Australia)
Safety∙ CAN/CSA-C22.2 No. 61010-1-2012
∙ UL Std. No. 61010-1-2012
∙ IEC/EN 61010-1-2010
∙ Device is not intended for use in hazardous locations
Operating Conditions∙ Ambient Temperature (Non-Hazardous Applications): Transmitter -40 °F to 176 °F (-40 °C to 80 °C)
LCD Screen -4 °F to 158 °F (-20 °C to 70 °C)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA
Model Numbers∙ 900 MHz: WT-0900-LL6; 2.4 GHz: WT-2400-LL6
Wirelessly Connects To∙ OTC Wireless Gateway
Configuration Cable∙ SX1000-CC2, 20-ft All-in-One Configuration Cable
Replacement Battery∙ Use OleumTech SX1000-BP3 Only