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Building on 40 years experience with alcohol fuel cell sensors

Formaldehyde Sensor FAQ

Please contact us if your question is not answered either here or by the datasheet.

Does the formaldehyde sensor need a pump?

Some manufacturers use one but it works fine as a passive device.

What is the maximum concentration that can be measured?

The maximum HCHO concentration would be defined as the concentration where the response ceases to be linear, unfortunately we currently cannot generate a sample gas concentration high enough to achieve that. The highest concentration we have tested at is currently 1ppm. 

What is the maximum pressure that the sensor can be used at?

Similarly constructed sensors of our manufacture have been tested in an external laboratory up to 10 atmospheres without ill effects. Being an aperture-controlled device, there is of course no coefficient of pressure, unlike membrane controlled devices.

What is the minimum concentration that can be measured?

0.03ppm is the lower limit of what is practical to measure as currently variations in zero offset can be of that order.

What effect does humidity have?

There is no response to humidity as such, but sharp changes cause a short-lived transient.

How stable is the calibration of the HCHO sensor?

Long term data we have suggest good calibration stability for at least three years. Under non-extreme exposures, five years is a reasonable expectation but we are still collecting data.

What is the repeatability of the formaldehyde sensor?

In the range we can currently test, repeatability is currently less than 2% of signal.

What substances are the sensors also sensitive to?

Please refer to the datasheet, listed in the “Product Documents” section of the formaldehyde sensor shop pages.

What is the part number of the Molex connector used to connect to your circuit boards?

50-37-5023 – you will also need the appropriate crimp tool if you plan to make your own connectors.


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