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OTC Transmitters

WIRELESS HYDROSTATIC LEVEL TRANSMITTER

Battery-Powered Self-Contained Level Monitoring Solution

WT-LL4 | WT-LL5

HIGHLIGHTS

  • 1-5 Vdc hydrostatic sensor input
  • Up to a 10-year battery life
  • Advanced local LCD display interface
  • Self-contained, rugged design
  • Installs in minutes
  • IP66, -40 °C to 70 °C (-40 °F to 158 °F)
  • 900 MHz / 915 MHz / 2.4 GHz / 868 MHz
  • Secure AES encryption
  • Class I, Division 1 (Zone 0), Intrinsically Safe

Supports 1-5 V Hydrostatic Level Sensors

The OleumTech® OTC Wireless Hydrostatic Level Transmitters measure level by monitoring pressure at the bottom point of vented top mount tanks, deep wells, water towers, rivers, and lakes. The transmitters are equipped with one 0-5 Vdc analog input and provide high resolution 24-bit analog to digital conversion (ADC). The transmitters can supply up to 9.5 Vdc to the connected sensor. The WT-LL4 direct mount version includes a specified length hydrostatic pressure sensor and direct mounting solution while the WT-LL5 allows users to select their own sensor and mounting method. The WT-LL5 also provides a discrete input. These ultra-lower-power transmitters are powered by replaceable battery packs that provide up to a 10-year life.1 The push button LCD interface allows for device configuration and instant access to process data.

Reliable, Scalable and Safe

The field-proven wireless transmitters 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 without a local display.

  • 0-5 PSI – 1-5 V, 25 ft Cable Length, Weight Kit Included, Part# A005025K
  • 0-10 PSI – 1-5 V, 50 ft Cable Length, Weight Kit Included, Part# A005050K
  • 0-25 PSI – 1-5 V, 75 ft Cable Length, Weight Kit Included, Part# A005075K

TECHNICAL SPECIFICATIONS

WIRELESS COMMUNICATIONS 
Radio Band∙ ISM Band (License-Free)
900 MHz / 915 MHz∙ FHSS, FSK, AES Encryption 256-bit (900 MHz), 128-bit (915 MHz)
2.4 GHz∙ DSSS, AES Encryption 128-bit
868 MHz∙ LBT-AFA, AES Encryption 128-bit
Bit Rate∙ 900/915 MHz: 9600 bps / 115.2 kbps; 2.4 GHz: 250 kbps; 868 MHz: 80 kpbs
Output Power (Max)∙ 900/915 MHz: 10 mW; 2.4 GHz: 63 mW; 868 MHz: 25mW
Receiving Sensitivity∙ 900/915 MHz: -110 dBm @ 9600 bps, -100 dBm @ 115.2 kbps
∙ 2.4 GHz: -101 dBm @ 250 kbps; 868 MHz: -106 dBm @ 80 kbps
RF Range∙ 900/915 MHz: Up to 7500 Feet / 1.4 Miles (2.3 km) with Clear Line of Sight
∙ 2.4 GHz: Up to 4.3 Miles (7 km) with Clear Line of Sight
∙ 868 MHz: Up to 5.2 Miles (8.4 km) with Clear Line of Sight
HARDWARE FEATURES 
Device Functionality∙ Liquid Level Sensing Wireless Transmitter Using Hydrostatic Technology
Embedded Controller∙ Ultra-Low Power RISC Microcontroller with Internal FLASH (Field Upgradeable)
Configuration∙ Standard RS232 Serial / BreeZ® Software for PC
Sensor Type∙ Submersible Hydrostatic Pressure Sensor (Sold Separately), Wide Operating Temperature Range
Discrete Input∙ Dry Contact, NPN (Sink), Debounce Filter 20 - 2000 ms, 16-bit Counter (Available on WT-LL5)
Power Source∙ Self-Contained, Internal 3.6 Vdc Lithium Battery
Internal Battery Life∙ Up to 10 Years, Based on User Defined Reporting Intervals1
Local LCD Display∙ 32-Character Display (16x2 Lines) with 4 Function Keys + Read Button
Instant Displayable Read∙ Level / Discrete Input / 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
MECHANICAL SPECIFICATIONS
Dimensions, LL4∙ 5.5" (W) x 19.75" (H) x 4.4" (D) / 140mm (W) x 502mm (H) x 112mm (D)
Dimensions, LL5∙ 5.5" (W) x 12.8" (H) x 4.4" (D) / 140mm (W) x 325mm (H) x 112mm (D)
Package Dimensions, LL4∙ 14" (W) x 30" (H) x 7" (D) / 356mm (W) x 762mm (H) x 177.8mm (D)
Package Dimensions, LL5∙ 10.25" (W) x 14" (H) x 6.5" (D) / 260mm (W) x 356mm (H) x 165mm (D)
Package Weight, LL4∙ ~10 lbs / 4.5 kg
Package Weight, LL5 ∙ ~7 lbs / 3.2 kg
Connection Fitting∙ WT-LL4: 1.5" NPT Male Compression Fitting; WT-LL5: 3/4" NPT Female
Enclosure Casing Material∙ Type 4X Aluminum; IP66
GENERAL SPECIFICATIONS
Operating Conditions∙ Ambient Temperature (Class I, Division 1 / Zone 0): -40 °C to 70 °C (-40 °F to 158 °F)
∙ LCD Screen -20 °C to 70 °C (-4 °F to 158 °F)
∙ Ambient Temperature (Non-Hazardous Applications): -40 °C to 80 °C (-40 °F to 176 °F)
∙ LCD Screen -20 °C to 70 °C (-4 °F to 158 °F)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA
CERTIFICATIONS & COMPLIANCE 
EMC/EMI∙ FCC Part 15 (USA), IC ICES-003 (Canada), ACMA (Australia)
∙ AS/NZS CISPR 32 (Australia), EN55032 & EN55024 (EU)
Safety∙ Class I, Division 1, Groups A, B, C, D T3C; Ex ia IIC T3
∙ Class I, Zone 0; AEx ia IIC T3
∙ ATEX: Sira 13ATEX2142X; Ex ia IIC T3 Ga; II 1 G
∙ IECEx: SIR 13.0054X; Ex ia IIC T3 Ga
GENERAL SPECIFICATIONS 
Operating Conditions∙ Ambient Temperature (Class I, Division 1 / Zone 0): -40 °C to 70 °C (-40 °F to 158 °F)
∙ LCD Screen -20 °C to 70 °C (-4 °F to 158 °F)
∙ Ambient Temperature (Non-Hazardous Applications): -40 °C to 80 °C (-40 °F to 176 °F)
∙ LCD Screen -20 °C to 70 °C (-4 °F to 158 °F)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA
ORDERING INFORMATION 
Model Numbers∙ Direct Mount: WT-0900-LL4, WT-0915-LL4, WT-2400-LL4, WT-0868-LL4
∙ Multi-Vendor: WT-0900-LL5, WT-0915-LL5, WT-2400-LL5, WT-0868-LL5
Wirelessly Connects To∙ OTC Wireless Gateway
Configuration Cable∙ SX1000-CC2, 20-ft All-in-One Configuration Cable
Replacement Battery∙ Use OleumTech SX1000-BP3 Only