PT104 Logger/Platinaresistanstermometer till PC- konverter med stor noggrannhet.

PT104 är en 4-kanals, högupplösande temperatur till PC omvandlare för användning med Pt100 och Pt1000 givare. Den kan också användas för att mäta resistans och spänning. Onoggrannhet 0,01 grd. C, upplösning 0,001 grd. C.

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Temperature

Platinum Resistance Thermometers (RTDs)

Platinum resistance thermometers (RTDs) offer excellent accuracy over a wide temperature range (from -200 to 850 C). Sensors are interchangeable between different manufacturers, and are available in various accuracy ratings in packages to suit most applications. Unlike thermocouples, it is not necessary to use special cables to connect to the sensor. (See our application note on choosing and using PT100 sensors for more information).

Sensor manufacturers offer a wide range of sensors that comply with BS1904 class B (DIN 43760): these sensors offer an accuracy of 0.3 C at 0 C. For increased accuracy, BS1904 class A (0.15 C) or tenth-DIN sensors (0.03 C). Companies like Isotech can provide standards with 0.001 C accuracy. Please note that these accuracy specifications relate to the SENSOR ONLY: it is necessary to add on any error in the measuring system as well.

Resistance

In Pt100/Pt1000/resistance mode, the unit uses a four-wire circuit and applies a continuous sense current of 250uA. For Pt100 and 0..500 ohms, the signal passes through an amplifier with a gain of 21: for Pt1000 and 0..10k, it feeds directly into the ADC. The sense current passes through the input resistor and through and internal, 3ppm reference. The value of this resistor is stored in EEPROM inside the unit. Yearly calibration is recommended.

Voltage

In voltage mode, the input connector can be treated as a differential input with ground, or two single ended inputs. Both inputs must be zero volts or above, though it does not matter which input has the higher voltage. The accuracy on the 2.5V range depends on the accuracy of the internal voltage reference. For the 113mV range, it also depends on the accuracy of the x21 amplifier. This may vary by 2%, and has a tempco of 100ppm/degC.

Software

The PT104 is supplied with PicoLog software for advanced data logging. PicoLog will automatically detect which sensor is connected and will display readings in the correct units. For users who wish to write their own custom software, drivers and examples are supplied.

Remote Data Collection

The pt104 is normally connected directly to a PC, but it is also possible to access the pt104 via a modem using the Windows driver. This enables the unit to be controlled or data to be accessed from a remote site.

Specification

  Temperature Resistance Voltage
Sensor Pt100*, Pt100
Range -200..800C 0..500 ohms*
0..10k ohms
0..113mV
0..2.5V
Linearity 10ppm 10ppm 10ppm
Accuracy @25C 0.005C 20ppm 0.2%
Temperature coefficient 3ppm/degC 3ppm/degC 50ppm/degC
Noise (95% confidence limit) 0.015C 50ppm 50ppm
Resolution 0.001C 1uohm 0.156uV
Number of inputs 4
Connectors 4-pin miniDIN
Input impedence >>1MOhm
Overvoltage protection +/-100V
Output RS232, D9 female
Environmental 20-30C for stated accuracy 0-70C overall 20-90% RH
Software PicoLog data logging software
Drivers for Windows 3.1/95/98/NT/2000/ME/Linux
Examples for C, Delphi, Excel, Labview, Labwindows, HP-VEE
Quoted accuracy is for options marked *

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