Instrumentation

Indoor air velocity monitoring with HD403TS2 omni-directional hot wire anemometer

chen.fz@otm.sg Instrumentation , , 0 Comment

Related instruments Airspeed & wind, Wireless & web data loggers

Shown below is an integrated system for indoor air velocity monitoring, ideal for thermal comfort applications:

Wireless data logger with USB dongle base unit
Omni-directional hot wire anemometer

The system consists of the following components:

  • HD35APD.E USB dongle base unit
    • Acts as the communication bridge between the wireless data logger and a computer.
  • HD35EDWH.E general-purpose wireless data logger
    • Supports up to 4 analog input channels. Compatible with typical analog signals such as 4–20 mA, PT100, and thermocouples.
  • HD403TS2 omni-directional hot wire anemometer
    • Measures air velocity in the range of 0 – 5 m/s. Suitable for accurate indoor air flow measurement.

The system was integrated by OTM, for easy deployment by the end users. Shown below is a screenshot of the computer software interface:

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HD35EDWH outdoor general-purpose wireless data logger

HD35EDWH outdoor general-purpose wireless data logger

HD403TS2 hotwire air velocity transmitter (omnidirectional probe, 4–20 mA)

HD403TS2 hotwire air velocity transmitter (omnidirectional probe, 4–20 mA)

HD35APD USB dongle base unit

HD35APD USB dongle base unit

ECO 130 handheld thermocouple thermometer

chen.fz@otm.sg Instrumentation , 0 Comment

Related instruments Temperature & humidity

Shown below is a Senseca ECO 130 handheld thermocouple thermometer with GTF300 probe:

The ECO 130 is a high-precision, compact thermocouple thermometer made in Germany. It is economically priced and suitable for quick manual measurements, but it does not have a data logging function.

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ECO 130 Handheld thermocouple thermometer

ECO 130 Handheld thermocouple thermometer

Weather station for wind, rain, solar radiation, temperature & humidity monitoring

chen.fz@otm.sg Instrumentation , , 0 Comment

Related instruments Weather station, Airspeed & wind

Below is an all-in-one weather station designed for measuring wind (speed and direction), rain, solar radiation, temperature, and humidity:

The instruments were installed on the rooftop deck of a historical building. A 3-meter-tall pole was used for mounting the anemometer.

The weather station operates independently, powered by a 30 W solar panel. Data is automatically uploaded to a cloud server for remote access.

OTM provides installation and maintenance services for this project.

The following key instruments are used:

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HD33MT.4 weather station data logger with 4G connectivity

HD33MT.4 weather station data logger with 4G connectivity

HD2015 tipping bucket rain gauge

HD2015 tipping bucket rain gauge

HD52.3DP147 anemometer with solar irradiance measurement

HD52.3DP147 anemometer with solar irradiance measurement

HD2021T illuminance transmitter

chen.fz@otm.sg Instrumentation 0 Comment

Related instruments Light & radiation

Below is an illuminance transmitter from Senseca for visible light measurement.

Specifications:

  • Measuring range: 0 – 2000 lux
  • Output type: 4 – 20 mA
  • Power supply: 16 – 40 VDC or 24 VAC

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HD2021T light and UV radiation transmitter

HD2021T light and UV radiation transmitter

Weather station for outdoor thermal comfort monitoring

chen.fz@otm.sg Instrumentation , , 0 Comment

Related instruments Weather station, Airspeed & wind, Thermal comfort, Temperature & humidity

Below is a weather station integrated by OTM for outdoor thermal comfort monitoring:

The station measures the following five environmental parameters:

  • Wind speed and direction
  • Air temperature and humidity
  • Globe temperature

These measurements are used for outdoor thermal comfort analysis, such as calculating the Universal Thermal Climate Index (UTCI). The data is automatically logged by the instruments and uploaded to a cloud server.

The following key instruments are used:

We also provided installation and maintenance services for this project.

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TP875.1.I globe thermometer probe (radiant heat measurement, Ø150 mm)

TP875.1.I globe thermometer probe (radiant heat measurement, Ø150 mm)

HD33MT.4 weather station data logger with 4G connectivity

HD33MT.4 weather station data logger with 4G connectivity

HD53LS 2-axis ultrasonic anemometer

HD53LS 2-axis ultrasonic anemometer

HD9008TRR temperature & humidity transmitter (4–20 mA output, meteorological grade)

HD9008TRR temperature & humidity transmitter (4–20 mA output, meteorological grade)

Integrated indoor thermal comfort monitoring station

chen.fz@otm.sg Instrumentation 0 Comment

Related instruments Wireless & web data loggers, Temperature & humidity, air speed & wind

Shown below is an indoor thermal comfort monitoring station integrated by OTM. It is with cloud function (via 4G) and is great for reliable 24×7 remote monitoring.

View 1 of the station
View 2 of the station
4G base unit

Shown below is the configuration of the system:

The data is automatically uploaded to the cloud via 4G. Shown below is a screenshot of the cloud platform:

Four results are measured:

  • Air temperature
  • Relative humidity
  • Air velocity
  • Globe temperature

A Python code has been developed to calculate and plot the thermal comfort results. Shown below is a plot based on the results captured above.

The following products are used in the system:

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HD9817T1R compact temperature & humidity transmitter (0–1 V output)

HD9817T1R compact temperature & humidity transmitter (0–1 V output)

HD35EDWH outdoor general-purpose wireless data logger

HD35EDWH outdoor general-purpose wireless data logger

TP875.1.I globe thermometer probe (radiant heat measurement, Ø150 mm)

TP875.1.I globe thermometer probe (radiant heat measurement, Ø150 mm)

HD403TS2 hotwire air velocity transmitter (omnidirectional probe, 4–20 mA)

HD403TS2 hotwire air velocity transmitter (omnidirectional probe, 4–20 mA)

HD35AP4G base unit with 4G connectivity

HD35AP4G base unit with 4G connectivity

Senseca ECO 230 precision barometer/altimeter

chen.fz@otm.sg Instrumentation 0 Comment

Related instruments pressure transmitters

Shown below is a Senseca ECO 230 precision barometer/altimeter.

The instrument measures barometric pressure and calculates the corresponding altitude. The instrument is very compact, with dimensions 108 mm x 54 mm x 28 mm and a weight of 140 g.

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PRO 215 differential pressure handheld data logger

PRO 215 differential pressure handheld data logger

HD51.3DP147 all-in-one anemometer for coastal environment weather monitoring

chen.fz@otm.sg Instrumentation 0 Comment

Related instruments Weather station, Airspeed & wind

Shown below is an HD51.3DP147 all-in-one anemometer for coastal environment applications. It measures wind speed, wind direction, temperature, humidity, barometric pressure, and solar irradiance with a single instrument. Multiple output types are supported, and the MODBUS-RTU output is used by most users.

The HD51.3D… series is very similar to the HD52.3D… series. The main advantage is that HD51.3D is more rugged and it satisfies the the requirements of the MIL-STD-810G Method 509.6 and EN ISO 9227:2017 (salt fog anti-corrosion test). For Singapore customers, we recommend this model for applications in coastal environments.

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HD52.3DP147 anemometer with solar irradiance measurement

HD52.3DP147 anemometer with solar irradiance measurement

HD52.3DT147 anemometer with rain measurement

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HD51.3D 2-axis ultrasonic anemometer for harsh environments

HD51.3D 2-axis ultrasonic anemometer for harsh environments

Senseca PYRAsense03 class C pyranometer with MODBUS-RTU output

chen.fz@otm.sg Instrumentation 0 Comment

Related instruments Pyranometers, Weather station

Shown below is a Senseca PYRAsense03 class C pyranometer with MODBUS-RTU output:

Top view
Botton view

The new PYRAsense series pyranometers are equipped with diagnostic sensors of internal temperature, pressure, and humidity. The meters are with compact size and easy to mount.

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PYRAsense03 class C pyranometer

PYRAsense03 class C pyranometer

Wireless data logger for CO2 and indoor environment measurement

chen.fz@otm.sg Instrumentation , 0 Comment

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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HD35APD USB dongle base unit

HD35APD USB dongle base unit

HD35ED1NBV wireless data logger for CO2 measurement

HD35ED1NBV wireless data logger for CO2 measurement