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Unit 1 - 6115 4 St SE
Calgary AB  T2H 2H9


Unit 1 - 6115 4 St SE
Calgary AB  T2H 2H9
+1 403 282-7335

30 Amp Current Sensor AC/DC

ID: 1122_0 NRND

Measure up to 30 amps DC or ±30 amps AC with this current sensor. Connects to an Analog Input or VINT Hub port.


Quantity Available: 1000+

Qty Price
5 $29.45
10 $27.90
25 $24.80
50 $21.70
100 $20.15

For new systems and projects, we recommend using the following VINT products instead of this one.

The 1122 measures AC current up to 30 Amps and DC Current from -30Amps to +30Amps. Dual outputs allow the user to measure both the AC and DC components of complex current waveforms separately.


  • Measures DC current from -30 to +30 Amps
  • Measures AC current peak-to-peak or RMS up to 30 Amps
  • Connects to a Phidgets VINT port or voltage input
  • Includes 60cm Phidget Cable

Interface Boards and Hubs

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 Overview page.

Product Voltage Inputs
Part Number Price Number of Voltage Inputs Voltage Input Resolution (bits)
VINT Hub Phidget
$40.00 6 (Shared) *** 15 bit
1-Port VINT Hub Phidget
$24.00 1 (Shared) ** 16 bit
VINT Hub Phidget
$35.00 6 (Shared) * 15 bit
VINT Hub Phidget
$30.00 6 (Shared) *** 15 bit
Wireless VINT Hub
$60.00 6 (Shared) * 16 bit
$120.00 6 (Shared) * 16 bit
8x Voltage Input Phidget
$20.00 8 12 bit
PhidgetInterfaceKit 8/8/8
$80.00 8
PhidgetInterfaceKit 2/2/2
$50.00 2 10 bit
PhidgetInterfaceKit 8/8/8
$80.00 8 10 bit
PhidgetInterfaceKit 8/8/8 Mini-Format
$70.00 8 10 bit
PhidgetInterfaceKit 8/8/8 w/6 Port Hub
$110.00 8 10 bit
PhidgetTextLCD 20X2 : White : Integrated PhidgetInterfaceKit 8/8/8
$70.00 8 10 bit

Phidget Cables

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.

Product Physical Properties
Part Number Price Cable Length
Phidget Cable 10cm
$1.50 100 mm
Phidget Cable 30cm
$1.75 300 mm
Phidget Cable 60cm
$2.00 600 mm
Phidget Cable 90cm
$2.00 900 mm
Phidget Cable 120cm
$2.25 1.2 m
Phidget Cable 150cm
$2.50 1.5 m
Phidget Cable 180cm
$2.75 1.8 m
Phidget Cable 350cm
$3.00 3.5 m
Phidget Cable Kit
$10.00 80 mm

Getting Started

Welcome to the 1122 user guide! In order to get started, make sure you have the following hardware on hand:

Next, you will need to connect the pieces:

1122 0 Connecting The Hardware.jpg
  1. Connect the 1122 to the HUB0000 with the Phidget cable.
  2. To measure alternating current, you can either use the DC port to measure a peak-to-peak AC signal, or you can use the AC port to measure the RMS value. To measure direct current, either the AC port or the DC port will work, since RMS calculations will have no effect on a DC signal.
  3. Connect the current-carrying wire into the terminals of the current sensor, paying attention to polarity. For safety, ensure that the wire is not powered until you're finished connecting everything.
  4. Connect the HUB0000 to your computer with the USB cable.

Now that you have everything together, let's start using the 1122!

Using the 1122

Phidget Control Panel

In order to demonstrate the functionality of the 1122, 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 1122.

First Look

After plugging in the 1122 into the HUB0000, and the HUB0000 into your computer, open the Phidget Control Panel. You will see something like this:

HUB0000 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 1122 from the Sensor Type drop-down menu. The example will now convert the voltage into amperage (A) automatically. Converting the voltage to amperage (A) 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


The 1122 measures alternating current (AC) up to 30 Amps and direct current (DC) between –30 and +30 Amps. It uses a Hall effect based sensor to measure the magnetic field induced by the applied current flowing through a copper conductor. It then converts the magnetic data into a current measurement with internal calculations. The AC output will give the root mean square (RMS) value of an alternating current assuming the current is sinusoidal, and the sine wave is varying equally across the zero point. The AC output can also be used for signals that are not varying evenly around the zero point but the value will be the RMS plus a DC component. If a DC signal is being measured, the AC output will produce a signal that can be used to calculate the current but without the value representing direction of current flow.

Measuring Current

The 1122 should be wired in series with the circuit under test, as shown in the following diagrams:

Measuring Current Diagram 1.jpg

Measuring Current Diagram 2.jpg

In the diagrams above, the voltage source is represented by the battery symbol. The load is represented by a light bulb or schematic resistor symbol. The current flowing from the battery to the load is measured through the current sensor.


The Phidget libraries can automatically convert sensor voltage into amperage (A) by selecting the appropriate SensorType. See the Phidget22 API for more details. The formula to translate voltage ratio from the sensor into amperage is:

Phidget Cable


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

  • Programming Languages - Find your preferred programming language here and learn how to write your own code with Phidgets!
  • Phidget Programming Basics - Once you have set up Phidgets to work with your programming environment, we recommend you read our page on to learn the fundamentals of programming with Phidgets.

Product Specifications

Sensor Properties
Sensor Type Current (AC/DC In-Line)
Controlled By VoltageRatio Input
Sensor Output Type Ratiometric
Input Current Min ± 75 mA
Input Current Max ± 30 A
Surge Current (Input) 100 A
Measurement Error Max 5 %
Sensor Response Time Max 10 ms
Electrical Properties
Input Frequency 10 kHz
Supply Voltage Min 4.5 V DC
Supply Voltage Max 5.5 V DC
Current Consumption Max 10 mA
Output Impedance 1 kΩ
Input Impedance 1.5 mΩ
Output Voltage Min 0 V DC
Output Voltage Max 5 V DC
Physical Properties
Recommended Wire Size 10 - 26 AWG
Operating Temperature Min -40 °C
Operating Temperature Max 85 °C
Customs Information
Canadian HS Export Code 8473.30.00
American HTS Import Code 8473.30.51.00
Country of Origin CN (China)


Product History

Date Board Revision Device Version Comment
March 2008 0 N/A Product Release

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.

Code Samples

Example Options


				Make your selections to display sample code.

Here's a list of our current sensors:

Product Sensor Properties
Part Number Price Sensor Type Controlled By Input Current Min Input Current Max Current Measurement Resolution
30A Current Sensor Phidget
$25.00 Current (DC In-Line Hall Effect) VINT -30 A 30 A 1.1 mA
30 Amp Current Sensor AC/DC
$31.00 Current (AC/DC In-Line) VoltageRatio Input ± 75 mA ± 30 A
Clip-on Current Transducer 25A
$15.00 Current (DC Clip-on) Voltage Input (0-5V) -25 A 25 A 10 mA
Clip-on Current Transducer 75A
$20.00 Current (DC Clip-on) Voltage Input (0-5V) -75 A 75 A 10 mA
DC Current Sensor 0-10mA
$95.00 Current (DC In-Line) Voltage Input (0-5V) 0 A 10 mA
DC Current Transducer ±100A
$35.00 Current (DC Through-Hole) ±12V Adapter -100 A 100 A 200 mA
DC Current Transducer ±250A
$35.00 Current (DC Through-Hole) ±12V Adapter -250 A 250 A 500 mA
DC Current Transducer 0-100A
$35.00 Current (DC Through-Hole) ±12V Adapter 0 A 100 A 100 mA
DC Current Transducer 0-250A
$35.00 Current (DC Through-Hole) ±12V Adapter 0 A 250 A 250 mA
i-Snail AC Current Sensor 100Amp
$40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 100 A 100 mA
i-Snail AC Current Sensor 10Amp
$40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 10 A 10 mA
i-Snail AC Current Sensor 25Amp
$40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 25 A 25 mA
i-Snail AC Current Sensor 50Amp
$40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 50 A 50 mA