Products for USB Sensing and Control

Products for USB Sensing and Control

PHIDGETS Inc.

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

30 Amp Current Sensor AC/DC

ID: 1122_0

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

$31.00

Quantity Available: 1000+

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

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.


Comes packaged with

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

Documents

Projects

Product History

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

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 1018 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 1018 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 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 1122.

First Look

After plugging in the 1122 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 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

General

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.

Formulas

The Phidget libraries automatically convert voltage to amperage (A). See the Phidget22 API for more details. The formula to translate voltage from the sensor into amperage 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.

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 Primer.

Product Voltage Inputs
Image Part Number Price Number of Voltage Inputs Voltage Input Resolution
1010_0 $80.00 8 10 bit
1011_0 $50.00 2 10 bit
1018_2 $80.00 8 10 bit
1019_1 $115.00 8 10 bit
1203_2 $125.00 8 10 bit
DAQ1000_0 $20.00 8 12 bit
HUB0000_0 $30.00 6 (Shared) * 16 bit
SBC3003_0 $120.00 6 (Shared) * 16 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
Image Part Number Price Cable Length
3002_0 $2.00 600 mm
3003_0 $1.50 100 mm
3004_0 $3.00 3.5 m
3034_0 $1.50 150 mm
3038_0 $2.25 1.2 m
3039_0 $2.75 1.8 m

Here's a list of our current sensors:

Product Sensor Properties
Image Part Number Price Sensor Type Controlled By Input Current Min Input Current Max Current Measurement Resolution
1122_0 $31.00 Current (AC/DC In-Line) VoltageRatio Input ± 75 mA ± 30 A
3500_0 $40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 10 A 10 mA
3501_0 $40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 25 A 25 mA
3502_0 $40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 50 A 50 mA
3503_0 $40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 100 A 100 mA
3511_0 $95.00 Current (DC In-Line) Voltage Input (0-5V) 0 A 10 mA
3513_0 $95.00 Current (DC In-Line) Voltage Input (0-5V) 0 A 1 A
3584_0 $40.00 Current (DC Through-Hole) ±12V Adapter 0 A 50 A 50 mA
3585_0 $40.00 Current (DC Through-Hole) ±12V Adapter 0 A 100 A 100 mA
3586_0 $40.00 Current (DC Through-Hole) ±12V Adapter 0 A 250 A 250 mA
3587_0 $40.00 Current (DC Through-Hole) ±12V Adapter -50 A 50 A 100 mA
3588_0 $40.00 Current (DC Through-Hole) ±12V Adapter -100 A 100 A 200 mA
3589_0 $40.00 Current (DC Through-Hole) ±12V Adapter -250 A 250 A 500 mA