Air quality sensors

Visit  for more information.

Senseca air quality measurement instruments

Looking for top quality measurement instruments?
Contact OTM now

Message us:

Email us:

Call us:

(+65) 6908 0149

Sensors and transmitters

Data loggers

Blog posts

We are the distributor of Delta Ohm air quality measurement instruments in Singapore. Delta Ohm instruments are manufactured in Italy and widely used in Singapore, for critical research and industry applications.

Related products

Featured products

Click photo to download product data sheet.

HD21ABE17 indoor air quality monitor
Indoor air quality monitor


CO2 Transmitter


Particulate matter transmitter (PM1.0, 2.5 & 10)


Reference applications

Expand one of the blocks below for some reference applications.

Application 1: PM1.0, PM2.5 & PM10 measurement with wireless data logger

In this application, the following instruments were integrated for far infra-red radiation monitoring:

The system was wired and configured by OTM. Refer to this blog post for more details.

Application 2: All-in-one weather station for weather and air quality monitoring

In this application, the following instruments were integrated for weather and air quality monitoring:

More than 10 such stations were installed in different locations in Singapore. OTM provides integration, installation, and maintenance services. Shown below is an example of the installations.

Application 3: CO2 level monitoring with HD50 web data logger

In this application, an HD50 web data logger with an integrated CO2 probe was configured by OTM for CO2 level monitoring in an indoor space. The objective is to follow the advisory by NEA and BCA (document 1, document 2) to use CO2 level as a proxy to check the ventilation adequacy in an indoor space.

The end user just needed to do some simple last-step mechanical mounting. OTM performed all configurations before delivery. The end users need not to install and learn any software, as they can conveniently access the monitoring results from a cloud portal with a browser. Shown below are some results plotted in the cloud portal:

Application 4: Construction site dust level monitoring with wireless particulate matter data logger

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

The sensing part and data logging part are integrated into a single instrument. The instrument is rain-resistant and can be deployed outdoors. For mechanical mounting, the instrument can be clamped onto existing structures with 40 mm diameter. The instruments will be pre-configured before delivery and briefing on the basic operations will be provided.

For the instrument specifications, please refer to this post.

General sales conditions

  • Price: the price is indicative of a typical product and excludes items to be ordered separately (e.g. probes, cables, accessories, or calibration services). please contact us for an official quotation.
  • Lead time: 4-6 weeks
  • GST: Additional GST is applicable for Singapore customers
    • No additional charges for international customers
  • Payment terms: COD (Singapore customers) or advance (international customers)
    • Payment by cheque (Singapore customers only), bank transfer or Paypal (credit card)
  • Shipping: we will cover the shipping cost to your doorstep (limited to ASEAN countries)
    • We use Fedex for international shipping and the customer needs to cover custom taxes (shipping terms: FOB Singapore)
  • Warranty: 2 years

More products

Please contact us or visit

OTM is the distributor of Delta Ohm in Singapore. We absorb the shipping cost to all ASEAN countries.