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Gas Pressure Sensor Troubleshooting and FAQs

Gas Pressure Sensor, order code GPS-BTA, $83
Specifications and User Guide

TROUBLESHOOTING
-Primary Test: Plug the sensor into a Vernier interface and run the data-collection program. The units for the default readings are kPa and they should be reasonable for the altitude at which the sensor is being used (around 101 kPa at sea-level).
-Secondary Test: Connect a 20 mL syringe, from the Accessories Kit, to the sensor. Move the plunger of the syringe inward and check that the pressure readings increase.

RELATED TIL ENTRIES
-TIL 2824: My Gas Pressure Sensor leaks.
-TIL 1352: Can I Order Pressure Sensor Accessories Separately?
-TIL 582: What is the internal volume of the Gas Pressure Sensor?
-TIL 1698: My Gas Pressure Sensor readings are not what I expect them to be.
-TIL 703: I am using the Respiration Monitor Belt with Logger Pro. Why does the program always report the respiration rate as zero?
-TIL 2346: Is there a list of chemicals that should not be used with the Gas Pressure sensor?
-TIL 2090: What type of plastic is the Gas Pressure Sensor 2-Way Valve?
-TIL 834: Where can I find low-friction glass syringes for combined gas law experiments done with our Gas Pressure 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 (4 atm)
-Sensing Element: Honeywell SSCMRNN030PAAA5
-Combined Linearity and Hystersis: typical +/-0.25% at full scale
-Response Time: 10 ms
-Accuracy using factory calibration: +/-4 kPa
-Accuracy using one-point custom calibration at atmosphere: +/-3 kPa

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 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,
1. Connect the Gas Pressure Sensor to an interface and launch the software.
2. Initiate the calibration procedure and make sure the one-point calibration option is checked. 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.

Factory stored calibrations are:
kPa: slope = 51.71, intercept = -25.86
atm: slope = 0.5103, intercept = -0.25
mm Hg: slope = 387.8, intercept = -190.4

For calibration information on Gas Pressure Sensors produced before October 2011, see: TIL 2583: What is the calibration information for the Gas Pressure Sensor?

RELATED VERNIER PRODUCTS
Gas Pressure Sensor Replacement Parts, order code PS-ACC, $10
#1 1-hole Rubber Stopper, order code PS-STOP1, $1
#5 2-hole Rubber Stopper, order code PS-STOP5, $2
Luer-Lock Connector, order code PS-LUER, $1
Plastic 2-Way Valve, order code PS-2WAY, $2
Plastic Tubing, order code PS-TUBING, $1
Stopper Stem, order code PS-STEM, $1
Plastic Syringe, order code PS-SYR, $2
Plastic Tubing Clamps (Pack of 100), order code PTC, $40 (pkg. of 100)

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