LR35W1NTC temperature & humidity LoRaWAN data logger: this data logger supports 1 combined temperature & humidity probe
LR35WH general purpose data logger: this data logger supports 4 general input channels. In this installation, 4 PT100 temperature probes were connected.
The battery life of both loggers is longer than 2 years.
A few outdoor-type LoRaWAN gateways with 4G connectivity were deployed to provide network access. The signal coverage is around 1 km in an environment without tall buildings (with trees and other structures). The signal strength is reliable, based on the first few weeks of operation.
The data are automatically uploaded to the Delta OHM cloud. The end users can review the results online in real-time. The cloud service is free of charge.
OTM supplied all instruments and provided installation and maintenance services for this project.
At the customer’s request, we also customized a stand for the system. A similar system was customized by OTM before. The new system has castor wheels and it is easy to move the system around for measurement.
The power consumption of the system is very low. With the internal 3.4 Ah battery, the system can run for around 5 days without charging. The data can be directly downloaded via a USB cable. With a 4G SIM card, it is possible to connect the data logger to the cloud.
1 x HD35APD USB dongle type base unit: for wireless communication between the computer and the wireless data loggers; 1 base unit can support multiple wireless data loggers
The model HD35EDWPM is an upgraded version of the system shown in this post. The new model integrates the sensing part and the data logging part into a single unit.
Shown below is the software screenshot:
The system can be deployed for construction site dust level monitoring. The data logger is rain-resistant and can be deployed outdoors. A clamp is included for each unit and the mechanical mounting is very easy. If the data logging interval is set to 5 min or 10 min, the internal memory can store years of measurement data.
The rain detector can be used in an automated control system, e.g. to start a pump immediately when there is rain. It detects the rain status only (on/off of rain) but does not measure the rainfall amount (for this purpose, a rain gauge should be used). The detector detects rain by the wetness of the sensing part (the green color pad in the photo).
There are multiple types of output types available:
RS484 MODBUS-RTU or proprietary protocol
Analogue (0/4-20 mA by default or 0-10 V on request)
Voltage-free normally open contact
The voltage-free normally open contact can be connected to a relay to control other equipment.
We recently supplied an ISO 9060 spectrally flat Class A albedometer with a data logger and tripod to a customer in Singapore. Shown below are a photo of the system and a screenshot of the data logging software.