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OTC Transmitters


Battery-Powered Self-Contained High Level Detection Solution



  • Single or dual actuation (high / high-high)
  • Switch of desired length sold separately
  • Up to a 10-year battery life
  • Self-contained, rugged design
  • Installs in minutes
  • Class I, Division 1 (Zone 0)
  • Intrinsically Safe
  • IP66, -40 °C to 70 °C
  • 900 MHz or 2.4 GHz radio option
  • Secure AES encryption

High and High-High Level Detection

The OleumTech® “HLT” High Level Switch Transmitter provide two actuation points for detecting high and high-high liquid level conditions. The Transmitter can also report transition counts. This top tank mounting Transmitter is designed for use with an OleumTech high level switch. The level switch is sold separately so that users can select the desired length and choose single or dual actuation option. The HLT utilizes on-delay exception reporting method and users can set the debounce filter ranging from 20 ms to 2000 ms to control just when the high level detection occurs. As a safety measure, regardless of state change, this device reports to the wireless gateway every five minutes. This ultra-low-power transmitter is powered by a replaceable battery pack that provides up to a 10-year life.

Reliable, Scalable and Safe

The field-proven wireless sensor node 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 certified for use in Class I, Division 1 (Zone 0) hazardous locations. It is intrinsically safe, designed not to cause a spark, and can be serviced without being removed from a process.

This product is also available with a local display.


Type: 900 MHz / 2.4 GHz∙ ISM Band, Spread Spectrum
∙ 900 MHz: FHSS (Frequency Hopping), FSK, AES Encryption 256-bit (900 MHz), 128-bit (915 MHz)
∙ 2.4 GHz: DSSS (Direct-Sequence), AES Encryption 128-bit
Bit Rate∙ 900 MHz: 9600 bps / 115.2 kbps ; 2.4 GHz: 250 kbps
Output Power∙ 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 (2.3 km) with Clear Line of Sight
∙ 2.4 GHz: Up to 7 km / 4.3 miles with Clear Line of Sight
Device Functionality∙ High Level Sensing Wireless Transmitter (Top / Vertical Mount)
Embedded Controller∙ Ultra-Low Power RISC Microcontroller with Internal FLASH (Field Upgradeable)
Configuration∙ Standard RS232 Serial / BreeZ® Software for PC
Inputs∙ 2x Actuation Points (1 or 2 Float Option)
Power Source∙ Self-Contained, Internal 3.6 Vdc Lithium Battery
Internal Battery Life∙ Up to 10 Years, Based on User Defined Reporting Intervals
Device Diagnostics∙ Health Tags: Battery Voltage, Received Signal Strength Indication (RSSI), RF Refresh, RF Timeout
Dimensions∙ 5" (W) x 12.6" (H) x 4.4" (D) / 127 mm (W) x 320 mm (H) x 112 mm (D)
Package Dimensions ∙ 10.25" (W) x 14" (H) x 6.5" (D) / 260mm (W) x 356mm (H) x 165mm (D)
Package Weight∙ ~7 lbs / 3.2 kg
Connection Fitting∙ 2" NPT Male (Pipe Plug)
Enclosure Casing Material∙ Type 4X Aluminum; IP66
Switch Materials∙ 316 Stainless Steel
Switch Length∙ 1 to 6 Feet in 1" Increments / Custom Lengths Also Available
Specific Gravity∙ 0.60
EMC/EMI∙ FCC Part 15 (USA)
∙ IC ICES-003 (Canada)
Safety∙ Class I, Division 1, Groups A, B, C, D T3C; Ex ia IIC T3
∙ Class I, Zone 0; AEx ia IIC T3 / Ta = -40 to 158 °F (-40 °C to 70 °C)
∙ ATEX: Sira 13ATEX2142X; Ex ia IIC T3 Ga; II 1 G
∙ IECEx: SIR 13.0054X; Ex ia IIC T3 Ga / Ta = -4 to 158 °F (-20 °C to 70 °C)
Model Numbers∙ 900 MHz: SM5000-HLT; 2.4 GHz: SM5400-HLT
Wirelessly Connects To∙ OTC Wireless Gateway
Configuration Cable∙ SX1000-CC2, 20-ft All-in-One Configuration Cable
Replacement Battery∙ Use OleumTech SX1000-BP3 Only
Operating Conditions∙ Ambient Temperature (Class I, Division 1): -40 °F to 158 °F (-40 °C to 70 °C)
∙ Ambient Temperature (Non-Hazardous Applications): -40 °F to 176 °F (-40 °C to 80 °C)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA