With the transmitter offered here, the widespread
PT100 or PT1000 platinum temperature sensors can be connected in 2- or 3-wire technology to a 0..10 V voltage input. The platinum sensors are also often referred to as RTD (resistance temperature detector). These are available in all imaginable designs for air, liquids, screwing etc. This makes the RTD / platinum sensors suitable for almost all applications.
With the help of the transmitter, the following numbers of such sensors can be connected to PiXtend analog inputs:
- 2 pieces at PiXtend V1.3
- 2 pieces at PiXtend V2 -S-
- 4 pieces at PiXtend V2 -L-
- 4 pieces at PiXtend eIO Analog One
Please note that we also offer transmitters with a 4..20 mA output signal in our shop (click here). This allows even more sensors to be connected to PiXtend (V1.3, V2 -L- & eIO).
The transmitters are designed for mounting on standard 35mm mounting rails (according to DIN EN 60715) and are very space-saving (only 15 mm wide). With the high
basic accuracy of +/- 0.5 °C and 24 adjustable measuring ranges, the modules can be adapted to your application. The type of sensor connected (PT100 or PT1000) is automatically detected by the transmitter. If required, the offset temperature can be adjusted by means of a potentiometer (necessary or sensible for 2-wire technology of the sensors used).
They can also work in combination with many other controllers and gauges that have a 0..10V voltage input.
Details:
- DIN rail transmitter for PT100 / PT1000 temperature sensors
- Input: 1x PT100 or 1x PT1000, in 2- or 3-wire technology
- Output: 0..10 V analog voltage
- Connection (inputs and outputs): screw terminals, max. 1.5 mm² conductor cross-section
- Supply voltage of the transmitter: 12 .. 24 V
- Measuring accuracy: +/- 0.5 °C, depending on the sensor used
- Offset setting: +/- 8 °C
- Measuring ranges: see diagram
- Case dimensions: 79 x 53 x 15 mm
- Housing Material: polycarbonate PC-F (flammability according to UL94: V0), protection class IP20
- Permissible ambient conditions: -40 °C .. +85 °C
- No drivers or software needed
- Approval: CE, RoHS
- Scope of delivery: 1x transmitter, data sheet (English and German)
Tips for use:
The temperature, which the PT sensor measures, is converted by the transmitter into a voltage. This voltage must then be converted back into a temperature in the controller. The formula is simple, but it must be adjusted according to the set measuring range. Here's an example:
Set measuring range: -50 .. +150 °C
Temperature = analog voltage [V] * 200/10 - 50
The "200" stands for the set measuring range, the "10" for the range of the analog voltage (0..10 V - always remains the same) and the "50" stands for the maximum negative voltage in the measuring range.
The calculation in CODESYS could look like this:
rTempAI0 := rAnalogIn0 * 200.0 / 10.0 - 50.0; //measuring range -50 .. 150 °C
or
rTempAI0 := rAnalogIn0 * 150.0 / 10.0 - 100.0; //measuring range -100 .. 50 °C - delivery status
