# openQCM Wi2 · Tech specs

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_openQCM Wi2 · sheet 02 · Tech specs_

The compact, USB-powered Quartz Crystal Microbalance for frequency monitoring — a 43 g modular unit for gas and liquid sensing.

> Reported values should be considered with the device away from electromagnetic sources such as smartphones, motors, and similar equipment.

## Performance

- **Frequency noise:** RMS 0.5 Hz in air · 1.0 Hz in liquid (typical); acceptance test SD ≤ 1.0 Hz and ≤ 1.5 Hz
- **Typical mass sensitivity:** 4.42 × 10⁻⁹ g·Hz⁻¹·cm⁻² at 10 MHz

## Sensor

- **Number of sensors:** Single quartz resonator
- **Quartz sensors:** 5 MHz and 10 MHz, 14 mm, wrapped electrode (single-side contact)

## Measurement

- **Electronics interface:** Pierce oscillator (SN74LVC1GX04) and hardware counter
- **Quantity:** Frequency, at the fundamental
- **Dissipation:** No
- **Gate time:** 1 s

## Thermal

- **Temperature sensor:** MCP9808 (I²C) in the sensor module, measurement only
- **Temperature control:** No

## Mechanical

- **Main case:** Nylon PA2200
- **Sensor module:** Nylon PA2200; PMMA or PTFE window; FKM (Viton) O-ring
- **Chamber volume:** ~50 µl
- **Dimensions:** 66 × 50 × 26 mm
- **Weight:** 43 g

## Power and data

- **Power:** USB, 5 V
- **Wireless:** Wireless-ready: expansion header for a Wi-Fi module or custom PCB
- **Software:** Python, open source; Windows executable

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