Go Direct Wide-Range Pressure measures absolute gas pressure. It can be used to monitor pressure changes in gas-law experiments in chemistry and physics. Vapor pressure of various liquids can be monitored using this sensor. Its metal fittings provide for versatile, airtight connections. The following is a partial list of activities and experiments that can be performed using this sensor:
- Investigate the relationship between pressure and volume, Boyle’s law.
- Measure vapor pressure of liquids.
- Study the effect of temperature on gas pressure, Gay-Lussac’s law.
- Study the effect of temperature and concentration on the rate of decomposition of H2O2.
Note: Vernier products are designed for educational use. Our products are not designed nor are they recommended for any industrial, medical, or commercial process such as life support, patient diagnosis, control of a manufacturing process, or industrial testing of any kind.
You do not have to perform a new calibration when using the Go Direct Wide-Range Pressure. The sensor is calibrated prior to shipping. If you would like to perform your own calibration, follow the steps described here. A one-point calibration at atmosphere is adequate for most applications.
To perform a one-point calibration,
- Connect Go Direct Wide-Range Pressure to a device and launch the software.
- Initiate the calibration procedure.
- Enter the actual pressure as the known value.
- When the relative stability reading stabilizes, click Keep.
Click Apply to complete the calibration process. This calibration is automatically saved to the sensor. To restore the default calibration, click Reset to Defaults.
Go Direct Wide-Range Pressure has been calibrated to read station pressure. Station pressure is the true atmospheric pressure at your location, or station. If you prefer it to read sea level pressure for conducting weather studies, you can perform a one-point calibration to correct for elevation, using the sea-level corrected pressure value for your location obtained from a reputable source (NOAA, Weather Underground, etc.). Sea level pressure is the pressure after the station pressure has been adjusted to its equivalent pressure at sea level. This is commonly done to normalize pressures at various altitudes for weather forecasts.
Pressure in Liquids: Depth Measurements
If you measure the pressure at the end of a long plastic tube forced underwater, you can indirectly measure depth. Connect the tubing to the stem of Go Direct Wide-Range Pressure and then put the end of the tube under water. The pressure reading will increase 8.105 kPa (0.0800 atm or 60.79 mmHg) for every meter below the surface of the water. Note: If you measure depth in this way, the depth you are measuring is to the top of the water in the tubing.
Care and Maintenance
Clean sensor with a soft, damp cloth.
Go Direct Wide-Range Pressure contains a small lithium-ion battery. The sensor is designed to consume very little power and not put heavy demands on the battery. Although the battery is warranted for one year, the expected battery life should be several years. Replacement batteries are available from Vernier (order code GDX-BAT-300).
To store Go Direct Wide-Range Pressure for extended periods of time, put the device in sleep mode by holding the button down for at least three seconds. The red LED will stop flashing to show that the unit is in sleep mode. Over several months, the battery will discharge but will not be damaged. After such storage, charge the device for a few hours, and the unit will be ready to go.
Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If possible, store the device in an area that is not exposed to temperature extremes.
Go Direct Wide-Range Pressure is not water resistant and should never be immersed in water.
If water gets into the device, immediately power the unit down (press and hold the power button for more than three seconds). Disconnect the sensor and charging cable, and remove the battery. Allow the device to dry thoroughly before attempting to use the device again. Do not attempt to dry using an external heat source.