LoRaWAN data logging system for micro-climate monitoring

Related instruments Temperature & humidity, Wireless & web data loggers

Shown in the photo below is a LoRaWAN data logging system for micro-climate monitoring (soil temperature, air temperature & humidity), deployed in a public garden in Singapore:

The following instruments were used:

There are two LoRaWAN data loggers in the system:

  • 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.

Instrument for outdoor micro-environment measurement

Related instruments Temperature & humidity, Air speed & wind, Thermal comfort

Shown below is a system integrated by OTM for outdoor micro-environment measurement:

The system consists of the following components:

  • HD52.3DP17: ultrasonic anemometer for wind speed, wind direction, temperature, humidity, and solar irradiance measurement
  • TP876.1.I: 50 mm globe thermometer
  • HD33MT.4: data logger supporting 4G communication

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.

Wireless data loggers for construction site dust level monitoring

Related instruments Wireless & web data loggers, Air quality sensors

Shown below are two wireless data loggers for PM1.0, PM2.5, and PM10 measurements and they will be deployed by a construction company for construction site dust level monitoring:

The instruments are:

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.

HD9008T7AC Meteorological temperature transmitter with 4-20 mA output

Related instruments Temperature & humidity

Shown below is an HD9008T7AC meteorological temperature transmitter with 4-20 mA output:

The probe diameter is 26 mm and it is compatible with HD9007A-1 or HD9007A-2 solar radiation shield.

It measures air temperature only and it is suitable for applications not requiring relative humidity information (for example, solar panel performance monitoring).

HD2013.3 rain detector for rain status monitoring

Related instruments Weather stations

Shown below is an HD2013.3 rain detector from Delta OHM:

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.

Exhibition in WSH Forum on Heat Stress Management 2023

Related instruments Thermal comfort

OTM exhibited in WSH Forum on Heat Stress Management 2023 (25/05/2023, NUS Shaw Foundation Alumni House Auditorium), with the following two instruments exhibited:

  • HD32.3TC handheld instrument for WBGT measurement; key features:
    • With a large color touchscreen
    • Probes are interchangeable for various thermal comfort and micro-environment measurements
    • High accuracy
  • HD35EDWWBGT wall-mounted instrument for WBGT measurement; key features:
    • For long-term WBGT monitoring (up to 500 ml water capacity for the natural wet bulb temperature probe)
    • Suitable for outdoor installation
    • With a wireless data logger and it is possible to configure it with cloud connectivity
    • High accuracy

Shown below is a photo of our booth:

We are grateful for the exhibition opportunity and booth setup assistance provided by WSH Council and MOM, and also the exhibition items provided by Delta OHM.

Instrument for outdoor thermal comfort measurement (with solar panel and cloud service)

Related instruments Temperature & humidity, Air speed & wind, Thermal comfort

Shown below is an instrument integrated by OTM for outdoor thermal comfort measurement:

Below are the key features of the system:

  • Four quantities are measured: air temperature, relative humidity, airflow speed and globe temperature
  • Data logger included
  • With 4G connectivity and cloud service
  • With solar panel
  • Suitable for outdoor 24×7 monitoring
  • The height of the stand is adjustable in the range of 0.9 m to 1.5 m

Shown below is a screenshot of the cloud service portal:

Listed below are the key components in the systems:

Class A albedometer with data logger and tripod

Related instruments Pyranometers, Weather stations, Wireless & web data loggers

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.

Listed below are the components in the system:

Handheld data logger for UVC irradiance measurement

Related instruments Light & radiation

UVC disinfection is used in HVAC systems to eliminate germs and viruses, particularly in the current COVID-19 situation. UVC irradiance measurement is required for UVC radiation level control.

Shown below is a handheld data logger for UVC irradiance measurement, with the following components:

  • HD2102.2: handheld data logger for light and radiation measurement
  • LP471UVC: probe for UVC irradiance measurement

At the customer’s request, an ISO 17025 calibration certificate can be provided at an additional cost.