EPIC® SENSORS for preventive maintenance

Wireless LoRa transmitter IoTKey® WLT 310

Available as a component or a ready assembled measuring set for your LoRa network, or as a complete monitoring solution from sensor to web service. You choose!


  • Configurable, energy efficient LoRa 868 MHz (EU) transmitter for industrial grade wireless measuring and IIoT systems using LoRaWAN® protocol
  • Three configurable sensor inputs
  • Self adjusting transmit power
  • Battery or external power supply
  • Self diagnostics including battery monitoring
  • Configurable measurement intervals and alarm limits.

Typical industry sectors

  • Manufacturing
  • Energy
  • Water & Infrastructure.

Application examples

  • Problem diagnostics and preventive maintenance for bearings, pumps, gears, turbines, etc.
  • Detection of efficiency drops and maintenance needs in heat exchangers
  • Advanced and continuous oil quality monitoring for product maintenance, life cycle and cost optimization
  • Environmental measurements and monitoring for warehouses and storage areas, laboratory space, etc.
  • Remote monitoring for levels and temperatures in water supply and wastewater networks
  • Monitoring and improving energy efficiency in district heating systems
  • Mobile measuring sets for temporary condition monitoring of machines and production facilities. 

IoTKey® WLT 310 is a wireless LoRa (Long Range Radio) transmitter designed for various industrial applications and capable of sending data over extremely long ranges. The WLT 310 is a LoRaWAN CertifiedCM product.

The smart transmitter’s application parameters, measuring intervals and alarm limits are configurable Over-the-Air (OTA) and it regularly measures process values. It is a low-energy transmitter with a battery life of several years. The LoRa technology can be used with zero operating costs, and no 3G/4G network is needed for transmission. 

Please refer to more detailed Technical data below. 

Technical data

InputsChannels CH1 and CH2: Pt100, Pt1000, Linear resistance and Thermocouples
Channel CH3: Humidity sensor, 0-10 VDC and 0/4-20 mA
Output, signal rangeRF transmission LoRa 868 MHz (EU868), 
LoRa transmission technology has typically several km range outdoors, and the signal also transmits well indoors and even below ground.
Power supply

Battery: Lithium primary cell, size C, 3.6 V, 8.5 Ah 
External voltage: 12/24 VDC

Temperature range; battery-25...+60 °C, depending on the battery type
Temperature range; external voltage-40...+80 °C
Weight39 g
Height25 mm
Diameter57 mm
Wire size1 x 1.0 mm2 stranded wire 
Compliance standards: 
EMCEN 61326-1:2013 and EN 301489
RFEN 300 220-1 v2.4.1

EN 60068-2-6

WLT 310 is a LoRaWAN CertifiedCM product

Connection examples

Assembly examples

  • WLT 310 transmitter w/o accessories. For device manufacturing and replacement part.
  • WLT 310 transmitter attached to a EPIC® SENSORS temperature sensor, which is equipped with a high top connection head to provide a sufficient battery compartment. With external antenna. Applicable for all inserted temperature sensor types. 
  • WLT 310 transmitter assembled in a plastic Bocube PC-V0 enclosure. With internal antenna. Applicable for all cable-connected sensor types and analog signals, current or voltage.
  • Assemblies for hazardous Ex applications: please see IoTKey® for ATEX environments » 
WLT 310 Transmitter, w/o antenna, w/o enclosure
WLT 310 Transmitter, w/o antenna, w/o enclosure
WLT 310 Transmitter in a temperature sensor connection head D/W/H (high), with external antenna
WLT 310 Transmitter in a temperature sensor connection head D/W/H (high), with external antenna
WLT 310 Transmitter in a plastic Bocube enclosure (PC-V0), with internal antenna
WLT 310 Transmitter in a plastic Bocube enclosure (PC-V0), with internal antenna

What is LoRa?

LoRa is the acronym for Long Range Radio. Thus, a LoRaWAN® is an LPWAN (Low Power Wide Area Network) specification designed for wireless, battery-operated “Things” (devices) in regional, national or global networks – as part of the Internet of Things (IoT). LoRaWAN® targets key requirements of the IoT, such as seamless interoperability among smart Things, without the need for complex local installations. It gives users, developers and companies the freedom to expand the IoT.

Read more: LoRa Alliance® web site: www.lora-alliance.org »

Other frequent questions are answered on page FAQ »

IoTKey® is a registered trademark of Lapp Automaatio Oy.

IoTKey® Transmitter WLT 310 is a LoRaWAN CertifiedCM product. Lapp Automaatio Oy is a LoRa Alliance® Member.

LoRa Alliance®, LoRa Allicance® Member, LoRaWAN®, and LoRaWAN CertifiedCM are marks used under license from the LoRa Alliance®.


Update 25.3.2020

Dear customers, 

The Corona virus epidemic still has no significant impact on our performance. Products stored in Finland we continue delivering within the normal delivery times....

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Lapp Automaatio now offers the possibility to install the IoTKey® wireless measurement and remote monitoring system in hazardous industrial environments.

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Our customer service and sales will be closed throughout the Christmas week, December 23-27.
From Monday December 30 onward, it's business as usual again.

Please send your orders to us no later than...

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