The 1115 measures absolute gas pressure from 20 to 250 kPa (2.9 to 36.3 psi) with a maximum error of ±1.5%.
It is suitable for measuring vacuum, or atmospheric pressure; it can also be used as a crude barometer.
|Sensor Type||Gas Pressure|
|Sensor Output Type||Ratiometric|
|Pressure Min||20 kPa|
|Pressure Max||250 kPa|
|Measurement Error Max||± 1.5 %|
|Response Time Max||1 ms|
|Supply Voltage Min||4.8 V DC|
|Supply Voltage Max||5.5 V DC|
|Current Consumption Max||5 mA|
|Output Impedance||1 kΩ|
|Output Voltage Min||204 mV DC|
|Output Voltage Max||4.9 V DC|
|Operating Temperature Min||0 °C|
|Operating Temperature Max||85 °C|
If you are interested in the difference in pressure between two points you need the 1126 - Differential Gas Pressure Sensor.
|Date||Board Revision||Device Version||Comment|
|August 2005||0||N/A||Using MPXA4250 sensor|
|October 2007||0||N/A||Using MPXA6250 sensor|
|August 2014||Product Discontinued.|
Welcome to the 1115 user guide! In order to get started, make sure you have the following hardware on hand:
Next, you will need to connect the pieces:
Now that you have everything together, let's start using the 1115!
In order to demonstrate the functionality of the 1115, we will connect it to the 1018, and then run an example using the Phidget Control Panel on a Windows machine.
The Phidget Control Panel is available for use on both macOS and Windows machines. If you would like to follow along, first take a look at the getting started guide for your operating system:
Linux users can follow the getting started with Linux guide and continue reading here for more information about the 1115.
After plugging in the 1115 into the 1018, and the 1018 into your computer, open the Phidget Control Panel. You will see something like this:
The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:
The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.
Double-click on a Voltage Ratio Input object in order to run the example:
General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:
Measures absolute gas pressure from 20kPa to 250kPa. The sensor can safely withstand pressures beyond 250kPa, but it will saturate and report 250kPa for any value above. The sensor will not be physically damaged by pressure until approximately 1000kPa.
Note: If you are interested in the difference in pressure between two points (Atmospheric vs. Human lungs for example) this sensor would not be appropriate. The gas pressure sensor required for this type of application is referred to as differential.
The Phidget libraries can automatically convert sensor voltage into pressure (kPa) by selecting the appropriate
SensorType. See the Phidget22 API for more details. The Formula to translate voltage into pressure is:
The 1115 reports the absolute pressure of its surroundings. In other words, the pressure compared to a perfect vacuum. If you plan on using the 1115 as a barometer, you need to convert to barometric pressure. You can use conversion calculators such as this above sea level barometer reading correction calculator to make the adjustment based on your location's elevation.
The Phidget Cable is a 3-pin, 0.100 inch pitch locking connector. Pictured here is a plug with the connections labelled. The connectors are commonly available - refer to the Analog Input Primer for manufacturer part numbers.