1130 User Guide

Required Hardware

• A 1130 pH/ORP Adapter Phidget
• An InterfaceKit or Hub to read the adapter
• A Phidget cable
• A USB cable
• A computer
• A compatible pH/ORP electrode

Connecting the Pieces

1. Connect the pH/ORP Adapter to the InterfaceKit or Hub with the Phidget cable.
2. Connect the pH/ORP probe to the adapter.
3. Use the DIP switch to select pH or ORP to correspond to the type of electrode you're using.
4. Connect the InterfaceKit or Hub to your computer with the USB cable.

Testing Using Windows

Phidget Control Panel

In order to demonstrate the functionality of the 1018, the Phidget Control Panel running on a Windows machine will be used.

The Phidget Control Panel is available for use on both macOS and Windows machines.

Windows

To open the Phidget Control Panel on Windows, find the icon in the taskbar. If it is not there, open up the start menu and search for Phidget Control Panel

macOS

To open the Phidget Control Panel on macOS, open Finder and navigate to the Phidget Control Panel in the Applications list. Double click on the icon to bring up the Phidget Control Panel.

For more information, take a look at the getting started guide for your operating system:

• Getting started with Windows
• Getting started with macOS

Linux users can follow the getting started with Linux guide and continue reading here for more information about the 1018.

First Look

After plugging the 1018 into your computer and opening 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:

• 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 If your Phidget is listed in red, your firmware is out of date.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 Input

Double-click on a Voltage Input object in order to run the example: [[Image:{{{1}}}_VoltageInputSensor_Example.jpg|center|link=]]

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.
• If you have an analog sensor connected that you bought from us, you can select it from the Sensor Type drop-down menu. The example will then convert the voltage into a more meaningful value based on your sensor, with units included, and display it beside the Sensor Value label. Converting voltage to a Sensor Value is not specific to this example, it is handled by the Phidget libraries, with functions you have access to when you begin developing!

For more information about Voltage Inputs, check out the Voltage Input Primer.

Testing Using Mac OS X

1. Go to the Quick Downloads section on the Mac OS X page.
2. Download and run the Phidget OS X Installer
3. Click on System Preferences >> Phidgets (under Other) to activate the Preference Pane
4. Make sure your device is properly attached
5. Double click on your device's objects in the listing to open them. The Preference Pane and examples will function very similarly to the ones described above in the Windows section.

Testing Using Linux

For a general step-by-step guide on getting Phidgets running on Linux, see the Linux page.

Using a Remote OS

We recommend testing your Phidget on a desktop OS before moving on to remote OS. Once you've tested your Phidget, you can go to the PhidgetSBC, or iOS pages to learn how to proceed.

Technical Details

Measuring the pH

To determine the pH of a solution, make sure the DIP switch on the board is flipped to the pH side. Given the voltage from the sensor, the following formula can be applied:

${\text{pH}}=3.56\times {\text{Voltage}}-1.889$

This formula assumes that the solution is at 25 degrees Celsius. Depending on the temperature of the solution and on the actual pH level, the output voltage can change dramatically. To incorporate temperature (in degrees Celsius) for added accuracy, the following formula can be used:

${\text{pH = 7 }}-{\frac {2.5-{\text{Voltage}}}{0.257179+0.000941468\times {\text{Temperature}}}}$

The following example is to give an idea of how the temperature affects the output voltage. A solution with a pH of 2 at a temperature of 25 degrees Celsius yields a voltage of 1.095V. At 100 degrees Celsius, the voltage decreases to 0.74V, and at 0 degrees celsius, the voltage reports 1.21V. A solution with a pH of 8 with a temperature of 0, 25 and 100 degrees Celsius gives a voltage of 2.76V, 2.78V and 2.85V, respectively. It can be seen that the temperature has a greater affect on solutions that have a pH further away from the reference pH of 7. Additionally, temperature affects the impedance of the glass electrode, and can result in increased errors if not properly calibrated. If you want to monitor the temperature of the solution, you can use a thermocouple. You’ll need to add some sort of protective shielding to the thermocouple if you’re using acidic or basic solutions, though. Check out our thermocouple interfaces for more information.

Measuring Oxidation/Reduction Potential (ORP)

To determine the ORP of a solution, make sure the DIP switch on the board is flipped to the ORP side. Given the voltage from the sensor, the following formula can be applied:

${\text{ORP (V)}}={\frac {2.5-{\text{Voltage}}}{1.037}}$

ORP electrodes give a typical range of -2V to 2V, where the positive values are for oxidizers and the negative values are for reducers.

Words of Caution

The pH Adapter Board should be used to measure solutions that are 'electrically quiet'. Measuring pH in electrically noisy environments such as tanks with mixing pumps, and even other measuring devices is not recommended.

Choosing Electrodes

Review the data sheet for the electrode you have selected for your application to ensure that it complies with the device specifications of the pH Adapter Board. The important specification is the output voltage of the electrode. Many electrodes will work but it is important to verify compliance before connecting an electrode to the Adapter Board. In fact, any type of sensor that uses a BNC connector and complies with the voltage range of the 1130 should work. We have reviewed the following electrodes, and found that they can be used with the pH Adapter Board. This is by no means a comprehensive list, but can be used as a comparison with other electrodes if necessary.

Manufacturer	Web Page	Part Number
Omega	www.omega.com	PHE13XX, PHE14XX, ORE1311, ORE1411
Cole-Parmer	www.coleparmer.com	EW-59001, EW27003
Mettler-Toledo	www.mt.com	InLab (BNC) Series

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.

Further Reading

For more information on pH and ORP probes, check the PH/ORP Sensor Primer.

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.