Outdoor WBGT monitoring station with large water tank and cloud service

Related instruments Thermal comfort & microclimate, Wireless & web data loggers

Shown below is an HD35EDWWBGT outdoor WBGT monitoring station with a large water tank and cloud service.

Data logger and WBGT probes
Base unit with 4G connectivity

The features include:

  • Meets MOM workplace WBGT monitoring requirements
  • Safe for outdoor installations, with solar radiation shield for the temperature probe
  • Large water tank (500 cc), with expected autonomy longer than 1 month in Singapore
  • Data logger is battery power, with 2-year typical life
  • Base unit is with 4G connectivity and supporting cloud reading (note: local 4G subscription required, 230 VAC power supply required, base unit cannot be exposed to rain)

Shown below are the software and cloud portal screenshots:

Shown below is a photo taken from a site:

Related instruments

Wireless data logger for CO2 and indoor environment measurement

Related instruments Air quality sensors, Wireless & web data loggers

Shown below is a wireless data logger from Senseca for temperature, humidity, pressure, CO2 and VOC index measurement:

Shown below is the screenshot from the data logger software. An HD35APD base unit is used by this customer.

The absolute humidity and wet bulb temperature are calculated from the temperature and relative humidity.

This instrument is great for long-term indoor thermal environment and air quality monitoring. The instrument is powered by USB, and it is possible to be powered by standard phone chargers or power banks.

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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.

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.

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:

Wind speed & direction measurement with Delta Ohm HD53LS ultrasonic anemometer

Related instruments Weather stations, Wireless & web data loggers, Air speed & wind

Shown below is a wind speed and wind direction measurement system, with the following components:

  • HD53LS.S 2-axis ultrasonic anemometer with MODBUS-RTU output
  • HD35EDW-MB wireless data logger with MODBUS-RTU input

For this system, OTM also supplied a 2-meter-long stainless steel pole for mounting and wired/configured all instruments before delivery. The last step mechanical mounting was done by the end user. A USB dongle type base unit (HD35APD) was also included for manual downloading of monitoring data in a scheduled interval.

HD2003 3-axis ultrasonic anemometer

Related instruments Weather stations, Wireless & web data loggers, Air speed & wind

Shown below is a Delta OHM HD2003 3-axis ultrasonic anemometer (undergoing testing in our office):

The instrument measures 3 velocity components (u, v, w velocity components) and 3 additional quantities (temperature, humidity, and barometric pressure), and calculates a number of derived quantities (wind speeds and directions, sonic temperature, and wind gust), as shown in the screen capture below:

In this application, the data collected by HD2003 is logged by Delta OHM HD35EDW-MB wireless data logger with MODBUS-RTU input.

Delta Ohm LR35 LoRaWan wireless data logging system

Related instruments Wireless & web data loggers

A LoRaWan based wireless data logging system was recently deployed by OTM. The system consists of:

The system was fully integrated and configured by OTM. OTM will also provide 1.5 years of maintenance and data collection services.

The instruments are distributed in various locations of two buildings. Shown below are two important instruments of the system (left: a LoRaWan data logger; right: the LoRaWan gateway).

LR35WH (outdoor type general-purpose data logger)
LoRaWan Gateway (indoor type, with 4G connectivity)

Instruments for on-site solar irradiance and daylight illuminance monitoring

Related instruments Pyranometers, wireless & web data loggers, Light & radiation

Related services On-site testing & monitoring

A monitoring system was integrated and configured by OTM for on-site solar irradiance and daylight illuminance monitoring. The following Delta Ohm products were used:

The system is a fully automated system. The results are automatically logged and uploaded to the cloud, without site visits and manual operations.

The instruments (left: two sensors; right: wireless data logger)
Result page on Delta Ohm cloud

Particulate matter (PM1.0, PM2.5 & PM10) measurement with PMsense and wireless data logger

Related instruments Weather stations, Wireless & web data loggers, Air quality sensors

A system was integrated by OTM for construction site particulate matter (PM1.0, PM2.5 & PM10) measurement, with the following components:

  • Delta Ohm PMsense-M particulate matter transmitter with MODBUS-RTU output
  • Delta Ohm HD35EDW-MB wireless data logger supporting MODBUS-RTU output

Listed below are the key specifications:

  • PM measuring principle: laser scattering
  • Calibration certificate can be provided on additional cost
  • Measuring range: 0 – 1000 μg/m3 for each component
  • IP67 protection for both transmitter and data logger, suitable for outdoor installation
  • Wireless connection between data logger and base unit
Left: PMsense-M, right: HD35EDW-MB
Software screenshot