Vernier Software and Technology
Vernier Software & Technology

Gas Pressure Sensor User Manual

Gas Pressure Sensor

The Vernier Gas Pressure Sensor is used to monitor pressure changes in gas-law experiments in chemistry, biology, and physics.

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.

What's Included

  • two tapered valve connectors inserted into a No. 5 stopper
  • one tapered valve connector inserted into a No. 1 stopper
  • one two-way valve
  • two Luer-lock connectors connected to either end of a piece of plastic tubing
  • one 20 mL syringe
  • two transpiration tubing clamps

Compatible Software and Interfaces

The Gas Pressure Sensor may require a compatible interface and software. Choose a platform below to see compatible interface and software options.

Getting Started

  1. Connect the sensor to the interface (LabQuest Mini, LabQuest 2, etc.).
  2. Start the appropriate data-collection software (Logger Pro, Logger Lite, LabQuest App) if not already running, and choose New from File menu.

The software will identify the sensor and load a default data-collection setup. You are now ready to collect data.

If you are collecting data using a Chromebook™, mobile device such as iPad® or Android™ tablet, or a Vernier wireless sensor or interface, please see the following link for up-to-date connection information:

www.vernier.com/start/gps-bta

Using the Product

Connect the sensor following the steps in the Getting Started section of this user manual.

Important: The Gas Pressure Sensor sensing element will be damaged with direct contact to liquid.

Videos

Calibration

You do not have to perform a new calibration when using the Gas Pressure Sensor. The sensor is calibrated prior to shipping. If you do choose to calibrate, a one‑point calibration at atmospheric pressure is adequate for most applications.

To perform a one-point calibration

  1. Connect the Gas Pressure Sensor to an interface following the steps in the Getting Started section of this user manual.
  2. Initiate the calibration procedure and make sure the one-point calibration check box is selected. This should be the default option.
  3. Enter the actual pressure as the known value for Reading 1.
  4. When the voltage reading stabilizes, click Keep.
  5. If you want to use the calibration for the current session only, click Done to complete the calibration process. To save the calibration onto the sensor, click the storage tab and save to the sensor.

The Gas Pressure Sensor 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 (e.g., 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.

To further improve accuracy, you may want to perform a two-point calibration.

  1. Connect the Gas Pressure Sensor to an interface following the steps in the Getting Started section of this user manual. Change the units first, if desired.
  2. Initiate the calibration procedure and select the one-point calibration option check box to clear it.
  3. For the first calibration point, allow the sensor to equilibrate to atmospheric pressure. When the voltage reading stabilizes, enter the atmospheric pressure for Reading 1. When the voltage reading stabilizes, click Keep.
  4. For the second calibration point, apply pressure with an external pump, measuring it at the same time with a pressure gauge. Enter the gauge reading into the calibration dialog box in your data-collection program. When the voltage reading stabilizes, click Keep.
  5. If you want to use the calibration for the current session only, click Done to complete the calibration process. To save the calibration onto the sensor, click the storage tab and save to the sensor.

Specifications

Pressure range

0 to 210 kPa (0 to 2.1 atm or 0 to 1600 mmHg)

Maximum pressure that the sensor can tolerate without permanent damage

405 kPa

Accuracy using factory calibration

±4 kPa

Accuracy using one-point custom calibration at atmosphere

±3 kPa

Response time

10 ms

Internal Volume

0.8 mL

How the Sensor Works

The sensor in this unit has a membrane that flexes as pressure changes. This sensor is arranged to measure absolute pressure. One side of the membrane is a vacuum, while the other side is open to the atmosphere. The sensor produces an output voltage that varies in a linear way with absolute pressure. It includes special circuitry to minimize errors caused by changes in temperature.

Troubleshooting

For troubleshooting and FAQs, see www.vernier.com/til/1406

Repair Information

If you have watched the related product video(s), followed the troubleshooting steps, and are still having trouble with your Gas Pressure Sensor, contact Vernier Technical Support at support@vernier.com or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.

Accessories/Replacement Parts

Item Order Code

Pressure Sensor Accessories Kit

PS-ACC

#1 1-Hole Rubber Stopper

PS-STOP1

#5 2-Hole Rubber Stopper

PS-STOP5

Luer Lock Connector

PS-LUER

Plastic 2-Way Valve

PS-2WAY

Plastic Tubing

PS-TUBING

Stopper Stem

PS-STEM

Syringe

PS-SYR

Plastic Tubing Clamps (pkg. of 100)

PTC

Warranty

Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer. This warranty does not cover damage to the product caused by abuse or improper use. This warranty covers educational institutions only.

Contact Support

Fill out our online support form or call us toll-free at 1-888-837-6437.

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