Senseca

LR35 LoRaWAN Data Logger

IoT LoRaWAN® data logger series for environmental monitoring.

Models for temperature, humidity, pressure, differential pressure, CO₂, PM, solar radiation, rain, water level, soil VWC, analog and Modbus sensors
LoRaWAN® Class A, OTAA/ABP activation and AES128 encryption, preconfigured for The Things Network
Internal memory backup, with indoor and IP 67 waterproof outdoor versions

Quantity

Overview

The Senseca LR35 series are wireless IoT data loggers that record measured values and transmit them using LoRaWAN® technology, which allows a transmission range of several kilometres depending on the installation position and urbanisation, with very limited energy consumption for long battery operation. They suit IoT monitoring in smart buildings, agriculture, solar sites, storage, transport and environmental observation. The logger function keeps a backup of measurements in internal memory, so data remains available even if transmission is interrupted. The loggers can be integrated into any public or private LoRaWAN® network, are preconfigured for The Things Network, and measured values can be viewed through Senseca Cloud or third-party cloud services. The family covers temperature, humidity, atmospheric and differential pressure, CO₂, PM, solar radiation, rain, water level, soil VWC, analog inputs and RS485 Modbus-RTU sensors, in indoor versions and IP 67 waterproof outdoor versions.

Typical applications

Smart buildings
Agriculture
Solar sites
Storage
Transport
Environmental observation

Key Features

LoRaWAN® Class A, RF power +14 dBm, EU868, US915, AU915, AS923 bands depending on model (other frequencies on request)
OTAA and ABP activation methods with AES128 data encryption
Factory configured for The Things Network; integrates into any public or private LoRaWAN® network
Internal memory from 14,000 to 120,000 samples, depending on model, as backup if transmission fails
Measuring interval from 1 s to 60 min; data transmitting interval from 2 to 60 min
Versions without display, with custom LCD or with graphic LCD, depending on model
Configuration via HD35AP-S software, front keyboard (indoor LCD versions) or iotcloud.deltaohm.com platform
Acoustic alarm with internal buzzer and mini-USB port

Benefits

Long-range data: LoRaWAN® transmission reaches several kilometres, depending on installation conditions
Backup built in: the logging function keeps measurement data recoverable if transmission fails
Flexible networks: connects to public or private LoRaWAN® networks and is preconfigured for TTN
Broad sensor choice: covers temperature, humidity, CO₂, PM, rain, solar, soil and standard inputs
Outdoor options: outdoor models offer IP 67 waterproof protection for -20…+70 °C operation
Low-power operation: battery-powered models run 2 years typical with 2 min measuring and transmitting intervals

Specifications

INDOOR MODELS	Without display / with display
Temperature, fixed NTC probe	LR35NTV… / LR35LNTV…
Temperature, Pt100/Pt1000 probe with cable, 1 channel	LR357P/1TC… / LR35G7P/1TC…
Temperature, Pt100/Pt1000 probes with cable, 3 channels	LR357P/3TC… / LR35G7P/3TC…
Relative humidity & temperature, combined NTC and RH probe with cable	LR351NTC… / LR35L1NTC…
Relative humidity & temperature, fixed NTC probe, chemically resistant RH sensor	LR351NTV… / LR35L1NTV…
Relative humidity, temperature & atmospheric pressure	LR3514bNTV… / LR35L14bNTV…
CO₂, relative humidity & temperature, CO₂ up to 5000 ppm	LR351NB… / LR35G1NB…
Differential pressure, autozero, ±100 Pa	LR354r1Z… / LR35L4r1Z…
Temperature, relative humidity & differential pressure, autozero, ±100 Pa	LR351N4r1ZTV… / LR35L1N4r1ZTV…
Standard analog sensors, three configurable terminal inputs	LR35H… / LR35GH…

OUTDOOR MODELS
Relative humidity & temperature, combined NTC probe with cable	LR35LW1NTC
Particulate matter PM1.0, PM2.5 and PM10	LR35WPM (external power supply) LR35WPM-USB (USB power supply)
Particulate matter & CO₂	LR35WPMB (external power supply) LR35WPMB-USB (USB power supply)
Solar radiation, pyranometer input	LR35LWRTC
Rainfall, rain gauge with contact output	LR35LWPTC
Rainfall & water level, rain gauge and level sensor inputs	LR35LWDPTC
Soil water content & temperature, combined VWC/T probe, 1 or 3 inputs	LR35LWS/1TC, LR35LWS/3TC
Standard sensors, four configurable terminal inputs, internal battery	LR35LWH
RS485 Modbus sensors & rainfall, Modbus-RTU and contact inputs	LR35LW-MB

COMMUNICATION
RF band	EU868, US915, AU915, AS923 depending on model; KR920 in ordering codes; other frequencies on request
Antenna	Internal or external, depending on model
RF power	+14 dBm
LoRaWAN class	A
Activation methods	OTAA (Over-The-Air-Activation), ABP (Activation-by-Personalization)
Data encryption	AES128
Network	Any public or private LoRaWAN® network; preconfigured for The Things Network (TTN)
Data access	Senseca Cloud (iotcloud.deltaohm.com) or third-party services via Cayenne LPP or proprietary data protocol

LOGGING
Measuring interval	1, 2, 5, 10, 15, 30 s / 1, 2, 5, 10, 15, 30, 60 min (models measuring several quantities may have a minimum interval above 1 s)
Data transmitting interval	2, 5, 10, 15, 30, 60 min
Internal memory	From 14,000 to 120,000 samples, depending on model and number of inputs
Configuration	HD35AP-S software, front keyboard (indoor versions with LCD) or iotcloud.deltaohm.com platform
Alarm	Acoustic, by means of the internal buzzer

POWER & ENVIRONMENTAL
Power supply	Li-SOCl2 non-rechargeable battery (most models) 3 x AA alkaline batteries (differential pressure models) 7…30 Vdc (25 mA @ 24 Vdc) external supply or USB (PM models) 7…30 Vdc (< 10 mA) external supply (LR35LW-MB)
Battery life	2 years typical, with 2 min measuring and data transmitting interval (greatly reduced if the USB port is left connected to the PC for a long time)
Operating conditions	-20…+70 °C / 0…85 %RH not condensing (typical; varies by model, see datasheet)
Protection degree	IP 50 (most indoor models); IP 67 (waterproof outdoor models); IP 53 (PM models); see datasheet for model-specific values

MECHANICAL
Housing	ABS (indoor models); polycarbonate (outdoor models)
Weight	200 g approx. (indoor models); 250 g approx. (outdoor models)
Installation	Indoor: wall mount, removable (included support) or fixed (optional flanges) Outdoor: wall mount or fixing to a mast with optional supports
Connection to PC	Mini-USB port (indoor models: on the side)