# openQCM Wi2 · Design

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_openQCM Wi2 · sheet 03 · Design_

openQCM Wi2’s modular, versatile design makes it an ideal solution for customization and specific applications in gas and liquid sensing — engineered to minimize mechanical stress on the quartz crystal.

## A crystal that is held, not squeezed.

The mechanical design incorporates a pogo-pin connector and fine regulation of o-ring pressure, which minimizes mechanical stress on the quartz crystal — thereby reducing frequency drift and additional noise.

![Exploded view of the openQCM Wi2 showing pogo-pin connector and sensor module](https://openqcm.com/wp-content/uploads/2023/04/openQCM_Wi2_exploded_View.1.png)

In this view: Fluidic top cover and window; Lever for the O-ring pressure; Sensor module with pogo pins and temperature sensor; Main electronics with the Teensy; Case in nylon PA2200.

## Built around the crystal.

- Pogo-pin connector for quartz sensor electrical contacts
- Fine regulation of o-ring pressure
- Micrometric height adjustment for the measurement chamber
- Magnetic backreaction on sealing
- Materials compatible with most substances
- Hosts quartz sensors at different frequencies — typically 5 MHz and 10 MHz
- Integrated temperature sensor

![openQCM Wi2 sensor module with open top cover](https://openqcm.com/wp-content/uploads/2023/04/openQCM_Wi2_sensor_Module_open_top_Cover.1.png)

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openQCM by Novaetech S.r.l., Pompeii, Italy · Buy: https://store.openqcm.com/ · Contact: info@openqcm.com · https://openqcm.com/contacts