OTC Transmitters


Battery-Powered, Self-Contained Temperature Monitoring Solution



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 SM-RTD 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 SM-RTM multivendor version provides a junction box and wiring terminal board for accepting a third-party 2, 3, or 4-wire RTD sensors. 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.

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.


Radio Band∙ ISM Band (License-Free)
900 MHz∙ FHSS, FSK, AES Encryption 256-bit (900 MHz)
Bit Rate∙ 900 MHz: 9600 bps / 115.2 kbps
Output Power (Max)∙ 900 MHz: 10 mW
Receiving Sensitivity∙ 900 MHz: -110 dBm @ 9600 bps, -100 dBm @ 115.2 kbps
RF Range∙ 900 MHz: Up to 7500 Feet / 1.4 Miles / 2.3 km with Clear Line of Sight
RTD Element∙ Platinum 100 Ohm, Class A (Model SM-RTD)
Temperature Coefficient∙ 0.00385 (Model SM-RTD)
Probe Lengths∙ 2" to 18" / 30.5 to 45.5 cm in 1" / 25 mm Increments
Temperature Range∙ SM-RTD: -67 °F to 500 °F (-55 °C to 260 °C); SM-RTM: Temperature Range Depends on Sensor
Accuracy∙ SM-RTD: ±0.15 °C / ±0.06% @ 0 °C; SM-RTM: Accuracy Depends on Sensor
Materials∙ Probe Cover - Silver Coated Copper / Probe Insulation - PTFE
Device Functionality∙ Temperature Sensing Wireless Transmitter Using 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∙ Over 10 Years, Based on User Defined Reporting Intervals
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)
∙ Ambient Temperature (Non-Hazardous Applications): -40 °C to 80 °C (-40 °F to 176 °F)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA
Model Numbers∙ Direct Mount: SM5000-RTD
∙ Multi-Vendor: SM5000-RTM
Wirelessly Connects To∙ OTC Wireless Gateway
Configuration Cable∙ SX1000-CC2, 20-ft All-in-One Configuration Cable
Replacement Battery∙ Use OleumTech SX1000-BP3 Only