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The 1141 Absolute Pressure Sensor is an air pressure sensor that measures the absolute pressure of its environment. It can measure pressures from 15 kPa to 115 kPa.
|This sensor is designed to measure the pressure of clean, non-condensing air. Contact with moist air (i.e, human breath), dusty air, or other gases can damage the sensor.|
This sensor can be read by any Phidget with an Analog Input or VINT Hub port. It will connect to either one using the included Phidget cable. VINT Hub ports can behave just like Analog Inputs, but have the added flexibility of being able to be used as digital inputs, digital outputs, or ports to communicate with VINT devices. For more information about VINT, see the VINT Primer.
|Image||Part Number||Price||Number of Voltage Inputs||Voltage Input Resolution|
|HUB0000_0||$30.00||6 (Shared)||* 16 bit|
|SBC3003_0||$120.00||6 (Shared)||* 16 bit|
This sensor comes with its own Phidget cable to connect it to an InterfaceKit or Hub, but if you need extras we have a full list down below. You can solder multiple cables together in order to make even longer Phidget cables, but you should be aware of the effects of having long wires in your system.
Welcome to the 1141 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 1141!
In order to demonstrate the functionality of the 1141, we will connect it to the HUB0000, 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 1141.
After plugging in the 1141 into the HUB0000, and the HUB0000 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:
The Absolute Gas Pressure Sensor provides an accurate, high level analog input signal that is proportional to the environment’s pressure. The minimum pressure measurement for this sensor is 15 kPa. Any value lower than 15 kPa cannot be accurately distinguished.
The sensor port has a diameter of 2.79mm to 3.30 mm (nominal 3mm).
For hosing, we recommend using polyurethane tubing. We have had good results with 2.4mm ID tubing from EMI. In imperial measurement, 3/32” ID tubing is equivalent. This is available through laboratory supply stores such as Cole Parmer.
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 ratio into Pressure is:
This sensor reports the absolute pressure of its surroundings. In other words, the pressure compared to a perfect vacuum. If you plan on using this sensor 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.
This device doesn't have an API of its own. It is controlled by opening a VoltageRatioInput channel on the Phidget that it's connected to. For a list of compatible Phidgets with VoltageRatio Inputs, see the Connection & Compatibility tab.
You can find details for the VoltageRatioInput API on the API tab for the Phidget that this sensor connects to.
|Controlled By||VoltageRatio Input|
|Sensor Type||Gas Pressure (Absolute)|
|Sensor Output Type||Ratiometric|
|Pressure Min||15 kPa|
|Pressure Max||115 kPa|
|Case Pressure Max||400 kPa|
|Pressure Resolution||111 Pa|
|Measurement Error Max||± 1.5 %|
|Warm-up Time||20 ms|
|Response Time Max||1 ms|
|Supply Voltage Min||4.8 V DC|
|Supply Voltage Max||5.3 V DC|
|Current Consumption Max||10 mA|
|Output Impedance||1 kΩ|
|Output Voltage Min||200 mV DC|
|Output Voltage Max||4.8 V DC|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||125 °C|
|Recommended Tubing Size||3⁄32″|
|Date||Board Revision||Device Version||Comment|
|Oct 2012||0||N/A||Product Release|
|Image||Part Number||Price||Sensor Type||Pressure Min||Pressure Max||Pressure Differential Min||Pressure Differential Max||Pressure Resolution|
|1126_1||$32.00||Gas Pressure (Differential)||—||—||-25 kPa||25 kPa||55 Pa|
|1136_0||$32.00||Gas Pressure (Differential)||—||—||-2 kPa||2 kPa||5 Pa|
|1137_0||$32.00||Gas Pressure (Differential)||—||—||-7 kPa||7 kPa||17 Pa|
|1138_0||$32.00||Gas Pressure (Differential)||—||—||0 Pa||50 kPa||56 Pa|
|1140_1B||$30.00||Gas Pressure (Absolute)||20 kPa||400 kPa||—||—||413 Pa|
|1141_0||$32.00||Gas Pressure (Absolute)||15 kPa||115 kPa||—||—||111 Pa|
|PRE1000_0||$15.00||Gas Pressure (Absolute)||50 kPa||110 kPa||—||—||250 mPa|