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OTC Transmitters


Battery-Powered Self-Contained Temperature Monitoring Solution


RT1 | RT2


  • WT-RT1 includes a 2” to 18” RTD sensor
  • WT-RT2 supports third-party RTD sensors
  • High accuracy of ±0.15 °C / ±0.06% @ 0 °C (WT-RT1)
  • 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 2, 3, or 4-Wire RTD Sensor

The OleumTech® OTC Wireless RTD Temperature Transmitters are ideal for monitoring air, gas, water, or liquid temperatures. The WT-RT1 direct mount version is available with a 4-wire Platinum 100 ohm Class A RTD sensor with a high accuracy of ±0.15 °C / ±0.06% @ 0 °C. You can choose from 2 to 18-inch RTD length. It supports temperatures ranging from -55 °C to 260 °C. The WT-RT2 multivendor version provides a junction box and wiring terminal board for accepting a third party 2, 3, or 4-wire RTD sensor. The temperature output can be reported in Fahrenheit, Celsius, or both. These ultra-low-powered transmitters are powered by replaceable battery packs that provide 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 transmitters communicate 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 transmitters are certified for use in Class I, Division 1 (Zone 0) hazardous locations. They are 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.


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
RTD Element∙ Platinum 100 Ohm, Class A (WT-RT1)
Temperature Coefficient∙ 0.00385 (WT-RT1)
Probe Lengths∙ WT-RT1: 2" to 18" / 30.5 to 45.5 cm in 1" / 25 mm Increments
Temperature Range∙ WT-RT1: -67 °F to 500 °F (-55 °C to 260 °C); WT-RT2: Temperature Range Depends on Sensor
Accuracy∙ WT-RT1: ±0.15 °C / ±0.06% @ 0 °C; WT-RT2: Accuracy Depends on Sensor
Materials∙ Probe Cover - Silver Coated Copper / Probe Insulation - PTFE
Device Functionality∙ Temperature Sensing Wireless Transmitter Using an RTD Sensor
Embedded Controller∙ Ultra-Low Power RISC Microcontroller with Internal FLASH (Field Upgradeable)
Configuration∙ Standard RS232 Serial / BreeZ® Software for PC
ADC Resolution∙ 24-bit High-Resolution Delta-Sigma ADC
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∙ Temperature / 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
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
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
Model Numbers∙ Direct Mount: WT-0900-RT1, WT-0915-RT1, WT-2400-RT1, WT-0868-RT1
∙ Multi-Vendor: WT-0900-RT2, WT-0915-RT2, WT-2400-RT2, WT-0868-RT2
Wirelessly Connects To∙ OTC Wireless Gateway
Configuration Cable∙ SX1000-CC2, 20-ft All-in-One Configuration Cable
Replacement Battery∙ Use OleumTech SX1000-BP3 Only