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The TMP1200 allows you to precisely measure temperature using RTDs, thermistors, and other resistance-based sensors. A resistance temperature detector measures subtle temperature changes using a resistance of the element made of a pure metal (usually platinum). The resistance value will change in a precise and repeatable way. The RTD Phidget measures these subtle resistance changes, so you can get the most accurate temperature measurements. This Phidget connects to your computer through a VINT Hub.
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:
|Image||Part Number||Price||Number of VINT Ports||Controlled By|
|HUB5000_0||$60.00||6||Local Network (Ethernet or Wi-Fi)|
Here's a list of RTDs you can use with the TMP1200:
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.
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:
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.
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
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:
Linux users can follow the getting started with Linux guide and continue reading here for more information about the TMP1200.
After plugging the TMP1200 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:
The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.
The TMP1200 allows you to precisely measure temperature using RTDs, thermistors, and other resistance-based sensors. Measure temperature from your RTD in degrees Celsius by selecting the RTD type and the number of wires in the software. 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.
You can use your Control Panel to explore your Phidget's channels.
1. Open your Control Panel, and you will find the following channels:
2. Double click on a channel to open an example program. Each channel belongs to a different channel class:
In your Control Panel, double click on "Resistance Input":
In your Control Panel, double click on "RTD Input":
Before you open a Phidget channel in your program, you can set these properties to specify which channel to open. You can find this information through the Control Panel.
1. Open the Control Panel and double-click on the red map pin icon:
2. The Addressing Information window will open. Here you will find all the information you need to address your Phidget in your program.
See the Phidget22 API for your language to determine exact syntax for each property.
The Change Trigger is the minimum change in the sensor data needed to trigger a new data event. The Data Interval is the time (in ms) between data events sent out from your Phidget. You can modify one or both of these values to achieve different data outputs. You can learn more about these two properties here.
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.
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.
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 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.
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.
|Maximum Measurable Resistance||50 kΩ|
|Temperature Error Max||0.2 °C|
|RTD Current Max||62 μA|
|Sampling Interval Min||250 ms/sample|
|Sampling Interval Max||60 s/sample|
|Current Consumption Min||* 17 μA|
|Current Consumption Max||* 4 mA|
|Recommended Wire Size||16 - 26 AWG|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||85 °C|
|Canadian HS Export Code||8471.80.00|
|American HTS Import Code||8471.80.40.00|
|Country of Origin||CN (China)|
* - Current consumption varies depending on selected data interval. See the graph below for details.
|Date||Board Revision||Device Version||Comment|
|August 2017||0||104||Product Release|
|January 2018||0||105||Increased maximum change trigger|
|January 2018||0||106||Library bug fixes|
|March 2020||0||107||Fixed bug where wire resistance could be NaN|
|April 2020||0||108||Fixed equations. Added internal calibration (only for new TMP1200)|
|TemperatureSensor||Visual Studio GUI||C#||Windows||Download|
|TemperatureSensor||Visual Basic .NET||Windows||Download|
|ResistanceInput||Visual Studio GUI||C#||Windows||Download|
|ResistanceInput||Visual Basic .NET||Windows||Download|