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

RTD Phidget

ID: TMP1200_0

Measure RTDs, thermistors, and other resistance-based sensors with this VINT port adapter.

$30.00

Quantity Available: 477

Qty Price
5 $28.50
10 $27.00
25 $24.00
50 $21.00
100 $19.50
250 $18.00
500 $16.50
1000 $15.00

For applications that require precise temperature measurement, you'll find that an RTD is often prescribed by the experts. The resistance of the element inside an RTD will change with temperature, and because it's made of a pure metal (usually platinum), this resistance value will change in a precise and repeatable way. The RTD Phidget measures these subtle changes, so you can get the most accurate temperature measurements sent right to your VINT hub. See the "Compatible Products" tab for a list of VINT Hubs.



Easy-to-use API

Setup is easy with this adapter; you can choose the number of wires that your RTD has (2, 3, or 4), and then select the type of RTD you're using (PT100, PT1000, etc.) with commands in our API. The adapter does all the math, leaving you with the sampled temperature in degrees Celsius.

Thermistor Compatible

You can also read thermistors and other resistive sensors by using the resistance sensor object in your program. You'll receive the data in ohms, and can convert to the desired unit by using the formula in your sensor's datasheet. You could even use it as a simple ohmmeter for resistances up to 19 kΩ.

Product Specifications

Board Properties
Controlled By VINT
Resistance Input
Maximum Measurable Resistance 19 kΩ
RTD Input
RTD Current Max 263 μA
Sampling Interval Min 100 ms/sample
Sampling Interval Max 60 s/sample
Electrical Properties
Current Consumption Min 10 μA
Current Consumption Max 4 mA
Physical Properties
Recommended Wire Size 16 - 26 AWG
Operating Temperature Min -40 °C
Operating Temperature Max 85 °C

Software Objects

Channel NameAPIChannel
RTD input TemperatureSensor 0
Resistance Input ResistanceInput 0

API


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Print this API

Documents

Library & Driver Downloads

Code Samples

APILanguageOS
TemperatureSensor C Multiple Download
TemperatureSensor C# Windows Download
TemperatureSensor Java Multiple Download
TemperatureSensor JavaScript Any Download
TemperatureSensor Objective-C macOS Download
TemperatureSensor Python Multiple Download
TemperatureSensor Visual Basic .NET Windows Download
ResistanceInput C Multiple Download
ResistanceInput C# Windows Download
ResistanceInput Java Multiple Download
ResistanceInput JavaScript Any Download
ResistanceInput Objective-C macOS Download
ResistanceInput Python Multiple Download
ResistanceInput Visual Basic .NET Windows Download

Product History

Date Board Revision Device Version Comment
August 20170104Product Release

Getting Started

Welcome to the TMP1200 user guide! In order to get started, make sure you have the following hardware on hand:

Next, you will need to connect the pieces:

TMP1200-functional.jpg
  1. Connect the TMP1200 to the VINT Hub using the Phidget cable.
  2. Connect the RTD to the Phidget. See the technical section for more information.
  3. Connect the VINT Hub to your computer with a USB cable.


Using the TMP1200

Phidget Control Panel

In order to demonstrate the functionality of the TMP1200, 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. 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 TMP1200.

First Look

After plugging the TMP1200 into your computer and opening the Phidget Control Panel, you will see something like this:

TMP1200 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.

Resistance Input

ResistanceInput Example.jpg

When you double click on an Resistance Input object, a window like the one pictured will open.

  • At the top of the window, information about your device and the properties of this particular channel will be listed.
  • On the left, change trigger and/or data interval can be changed. For more information on these settings, see the Data Rate/Change Trigger page. You can also select the type of wiring setup you're using to connect the RTD.
  • On the right, the current reading of the resistance is listed in ohms.


RTD Input

RTD Example.jpg

When you double click on an RTD Input object, a window like the one pictured will open.

  • At the top of the window, information about your device and the properties of this particular channel will be listed.
  • On the left, change trigger and/or data interval can be changed. For more information on these settings, see the Data Rate/Change Trigger page. You can also select the RTD type and the wiring setup to automatically calculate the temperature from the sensor reading.
  • On the right, the current reading of the temperature is listed in degrees Celsius.


Technical Details

Wiring Modes

Two-Wire Mode

This is the simplest wiring setup for an RTD, but also the least accurate because the resistance of the leads are not taken into account. To connect a 2-wire RTD to the RTD Phidget, connect one wire to the RTD+ terminal, and the other to the RTD- terminal. Then connect the EXC+ terminal to the RTD+ terminal and the EXC- to the RTD- terminal with two short wires.

In your program, set RTDWireSetup to 2-wire mode. In the Phidget22 API select the TMP1200 and your programming language of choice to see exact naming conventions.

Three-Wire Mode

In a three-wire RTD, the extra wire is added to measure the resistance of one of the leads. This calculation assumes that both leads have the same resistance. Your RTD should have two wires that share a color; connect one of these wires to the RTD- terminal and the other to the EXC- terminal. The differently colored wire connects to the RTD+ terminal. Then connect the EXC+ terminal to the RTD+ terminal with a short wire.

In your program, set RTDWireSetup to 3-wire mode. In the Phidget22 API select the TMP1200 and your programming language of choice to see exact naming conventions.

Four-Wire Mode

A four-wire RTD is normally used in precision measurement, when the assumption that both leads have the same resistance is not accurate enough. Unfortunately the RTD Phidget does not support this particular feature of four-wire RTDs. It does, however, support the use of four-wire RTDs using the same assumption as three-wire mode. To connect a four-wire RTD, simply connect one pair of same-colored wires to the RTD+ and EXC+ terminals, and the other pair to the RTD- and EXC- terminals.

In your program, set RTDWireSetup to 4-wire mode. In the Phidget22 API select the TMP1200 and your programming language of choice to see exact naming conventions.

Line Resistance Measurement

In three and four wire modes, this device will measure the line resistance every 5 minutes. This measurement will cause a delay in measurement for data intervals of less than 500ms. To force the line resistance to be recalculated, you must close and re-open the device.

Current Consumption

The amount of current consumed by the TMP1200 depends on the DataInterval being used:

TMP1200 current.jpg

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.

VINT Hubs

This Phidget is a smart device that must be controlled by a VINT Hub. For more information about VINT, have a look at the VINT Primer. You can use a Phidget Cable to simply and easily connect the two devices. Here's a list of all of the different VINT Hubs currently available:

Product Board
Image Part Number Price Number of VINT Ports
HUB0000_0 $30.00 6
SBC3003_0 $120.00 6

RTDs

Here's a list of RTDs you can use with the TMP1200:

Product
Image Part Number Price
TMP4109_0 $40.00
TMP4110_0 $40.00

Phidget Cables

Use a Phidget cable to connect this device to the hub. 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