Products for USB Sensing and Control

Products for USB Sensing and Control

Differential Air Pressure Sensor ± 25kPa

ID: 1126_0
This differential air pressure sensor plugs into a Voltage Input and measures pressure from -25 kPa to 25 kPa.

Replaced by 1126_1

Replaced by the 1126_1 – Differential Air Pressure Sensor ± 25kPa

Product Description

The Differential Pressure Sensor is a dual ported air pressure sensor that measures the pressure difference between the two ports. It can measure both positive and negative pressure from –25kPa to +25 kPa.

Comes packaged with

Warning

warning 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.

Product Specifications

Sensor Properties
Controlled By VoltageRatio Input
Sensor Type Gas Pressure (Differential)
Sensor Output Type Ratiometric
Pressure Differential Min -25 kPa
Pressure Differential Max 25 kPa
Case Pressure Max 200 kPa
Measurement Error Max ± 5 %
Response Time Max 1 ms
Electrical Properties
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 250 mV DC
Output Voltage Max 4.8 V DC
Physical Properties
Operating Temperature Min 0 °C
Operating Temperature Max 85 °C
Recommended Tubing Size 332

Documents

Product History

Date Board Revision Device Version Comment
March 2008 0N/A Product Release
January 2016 1N/A New PCB shape and color
Functionally, the 1126_1 is the same as the 1126_0. Only the size and color of the polycarbonate board that the sensor is soldered to has been changed. The size was changed to match the mounting pattern of our other gas pressure sensors.

Getting Started

Welcome to the 1126 user guide! In order to get started, make sure you have the following hardware on hand:


Next, you will need to connect the pieces:

1126 1 Connecting The Hardware.jpg
  1. Connect the 1126 to the 1018 with the Phidget cable.
  2. Connect the 1018 to your computer with the USB cable.


Now that you have everything together, let's start using the 1126!

Using the 1126

Phidget Control Panel

In order to demonstrate the functionality of the 1126, 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 1126.

First Look

After plugging in the 1126 into the 1018, and the 1018 into your computer, open the Phidget Control Panel. You will see something like this:

1018 Panel.jpg


The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:

  • Serial number: allows you to differentiate between similar Phidgets.
  • Channel: allows you to differentiate between similar objects on a Phidget.
  • Version number: corresponds to the firmware version your Phidget is running. If your Phidget is listed in red, your firmware is out of date. Update the firmware by double-clicking the entry.


The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.

Voltage Ratio Input

Double-click on a Voltage Ratio Input object in order to run the example:

1018 Sensors VoltageRatioInput.png


General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:

  • Modify the change trigger and/or data interval value by dragging the sliders. For more information on these settings, see the data interval/change trigger page.
  • Select the 1126 from the Sensor Type drop-down menu. The example will now convert the voltage into pressure (kPa) automatically. Converting the voltage to pressure (kPa) is not specific to this example, it is handled by the Phidget libraries, with functions you have access to when you begin developing!


Technical Details

General

The 1126 uses bipolar processing to provide an accurate, high level analog input signal that is proportional to the applied pressure. When the sensor is plugged in, the voltage defaults to 2.5V ±2%.

Ports

The sensor comes with a positive top port and a negative bottom port. These ports have 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.

Formulas

The Phidget libraries automatically convert voltage to pressure (kPa). See the Phidget22 API for more details. The Formula to translate voltage from the sensor into pressure is:





Phidget Cable

Analoginput.jpg

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.

What to do Next

  • Software Overview - Find your preferred programming language here to learn how to write your own code with Phidgets!
  • General Phidget Programming - Read this general guide to the various aspects of programming with Phidgets. Learn how to log data into a spreadsheet, use Phidgets over the network, and much more.
  • Phidget22 API - The API is a universal library of all functions and definitions for programming with Phidgets. Just select your language and device and it'll give you a complete list of all properties, methods, events, and enumerations that are at your disposal.