Remotely Monitor Critical Temperature Levels



  • 2 independently configurable temperature
    sensor inputs
  • Supports 2, 3, or 4-wire RTD sensors
  • Supports Thermocouple sensors type J or K
  • Works with external power or optional battery
  • Up to a 10-year battery life
  • Installs in minutes
  • IP66, NEMA 4X
  • -40 ˚C to 80 ˚C (-40 ˚F to 176 ˚F)
  • 900/915 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
  • 868 MHz range: Up to 1.5 Miles / 2.4 km with Clear Line of Sight
  • Secure AES encryption
  • Remote antenna-ready option available

Maximum Versatility

The OleumTech® GP-TR81 is a secure, rugged, and reliable general purpose wireless transmitter designed for monitoring up to two temperature levels using RTD and or Thermocouple sensors. The 
GP-TR81 supports 2, 3, or 4-wire Platinum 100 ohm RTD sensors and Thermocouple type J or K sensors. The temperature inputs can be configured independently to support any mix or combination of RTD and Thermocouple sensors.

Industrially Hardened

OleumTech wireless transmitters originated from the toughest outdoor oil and gas production locations throughout the world. They are designed to thrive in harsh, extreme weather conditions. Only the highest-grade materials go in to building our wireless instruments. The GP-TR81 is backed by a 2-year warranty.

Deploy Anywhere

The GP Wireless Temperature Transmitter can be powered using an external 9-30 Vdc source or optional SX1000-BP2 Battery Pack providing seamless flexibility. When powered by the Battery Pack, it can operate for up to 10 years before needing a battery replacement.

Scalable Solution, Easy to Use

The GP Wireless Sensor & I/O Network is comprised of a wireless gateway and wireless transmitters forming a star or point-tomultipoint network structure. Adding additional transmitters and managing I/O points are extremely simple with the OleumTech GP Network Configurator Software for PC, which is free for use to users.

∙ ISM Band, Spread Spectrum
Type: 900 MHz / 915 MHz∙ 900/915 MHz: FHSS, FSK, AES Encryption: 256-bit (900 MHz), 128-bit (915 MHz)
2.4 GHz / 868 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 1.9 Miles / 3.1 km with Clear Line of Sight
∙ 868 MHz: Up to 1.5 Miles / 2.4 km with Clear Line of Sight
Device Functionality∙ Wireless Transmitter with Support for RTD and Thermocouple Sensors
Embedded Controller∙ Ultra-Low Power RISC Microcontroller with Internal FLASH (Field Upgradeable)
Configuration∙ Mini-USB Port to USB (PC) / GP Network Configuration Software for PC
Sensor Inputs∙ 2 RTD (PT-100 ohm, 2, 3, 4-Wire Type) or Thermocouple Type J or K in Any Mix
Sensor Modes∙ Software Controls RTD or Thermocouple Mode (Independently Configurable)
Accuracy∙ Sensor Dependent
Power Source∙ External 9-30 Vdc Power or Internal 3.6 Vdc Lithium Battery
Device Diagnostics∙ Health Tags: Supply Voltage, Received Signal Strength Indication (RSSI), RF Refresh, Error Codes
Dimensions∙ 5.5" (W) x 7.6" (H) x 4.4" (D) / 140 mm (W) x 193 mm (H) x 112 mm (D)
Package Dimensions ∙ 10.25" (W) x 14" (H) x 6.5" (D) / 260 mm (W) x 356 mm (H) x 165 mm (D)
Weight∙ Net: 3.75 lbs ; Gross: 6.75 lbs
Connection Fittings∙ 3 3/4" NPT Female (Bolt Plugs Can Be Removed Using 10 mm Hex Wrench)
Enclosure Casing Material∙ Aluminum
Mounting Holes∙ 4 M5 Female Threads; Horizontal Spacing: 2.76" (70 mm); Vertical Spacing: 3.70" (94 mm)
Power Source∙ Internal 3.6 Vdc Lithium Battery or External 9-30 Vdc Power (Non-Switching)
Output Power Using Battery∙ Supplies 12 V, 20 mA Max Total to Analog Sensors
Internal Battery Life∙ Up to 10 years, Lifespan Based on User Defined Reporting Intervals
Power Consumption @ 9 V∙ 34 mA
Power Consumption @ 12 V∙ 27.5 mA
Power Consumption @ 24 V∙ 21 mA
Power Consumption @ 30 V∙ 19 mA
EMC/EMI∙ FCC Part 15 (USA), IC ICES-003 (Canada), ACMA (Australia)
∙ AS/NZS CISPR 32 (Australia), EN55032 & EN55024 (EU)
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): -40 °C to 80 °C (-40 °F to 176 °F)
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA
Model Number(s)∙ GP-0900-TR81, GP-0915-TR81, GP-2400-TR81, GP-0868-TR81
External Antenna-Ready Models∙ GP-xxxx-TR81-P (Equipped with N Connector Antenna Adapter)
Optional Battery∙ Use OleumTech SX1000-BP2 Only
Wirelessly Connects To∙ GP Wireless Gateway: GP-DH3 or GP-DH2-W
Configuration Cable∙ WX-1001-CA2, 15-ft USB to Mini-USB Cable or SX1000-CC2, 20-ft All-in-One Configuration Cable