Please contact us if your question is not answered either here or by the datasheet.
Some manufacturers use one but it works fine as a passive device.
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.
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.
0.03ppm is the lower limit of what is practical to measure as currently variations in zero offset can be of that order.
There is no response to humidity as such, but sharp changes cause a short-lived transient.
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.
In the range we can currently test, repeatability is currently less than 2% of signal.
Please refer to the datasheet, listed in the “Product Documents” section of the formaldehyde sensor shop pages.
50-37-5023 – you will also need the appropriate crimp tool if you plan to make your own connectors.