Tech Info Library

Gas Pressure Sensor Troubleshooting and FAQs

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

-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.

-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?

-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: 4 atm
-Sensing Element: Honeywell SSCMRNN030PAAA5
-Combined Linearity and Hystersis: typical +/-0.25% at full scale
-Response Time: 100 microseconds

-Calibrate? No. The sensor is set to match the stored calibration before shipping.

-If you wish to calibrate the sensor, you will need to conduct a two-point calibration. The first calibration point is set at the atmospheric pressure of the room with nothing attached to the sensor. After the voltage has stabilized, enter the atmospheric pressure, as recorded by a barometer. To set the second calibration point, take a 20 mL syringe and move the plunger to the 10 mL mark and then attach the syringe to the sensor. Move the plunger so that the voltage reads 3.0 V. Enter a value of 139.4 kPa (or 1.376 atm or 1045.9 mmHg) as the value for the second point.

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?

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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