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GP-HR Temperature Application Notes
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Any combination of the three analogue inputs of the GP-HR Logger can be configured to read Temperature. Different circuits and logger setup are required for Thermister and PT1000 sensors.

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Thermister Application Notes

For thermister applications an excitation resister is required between the input line and the switched supply line. For a 10k ohm thermister (Beta 3892 Farnell Part no 151-591 or 732-242) the excitation resister must have a value of 15k ohms and an error of 0.1% or less . The channels must then be setup to Thermister temperature mode using the OmniLog Software. 1, 2 and 3 Thermister Temperature Probe sets are supplied as standard probe sets for the GP-HR. These have the correct excitation resisters fitted inside the adapter socket.    

Circuit for GP-HR with 3 Thermister Temperature inputs

R1, R2 and R3 are 15k ohm ± 0.1% for a 10k ohm thermister

thermister_setup_circuit_diagram.gif (5293 bytes)

 

Setting up Thermister channels using the OmniLog Software

Connect the GP-HR logger to a computer and Run the OmniLog software

From the Logger Control Screen select Channel and Probe Setup

Select the Channel that you wish to setup (Ch 1, 2 or 3)

From the Probe box select the Temperature (Thermister) option as shown

omni_setup_mA1.gif (18403 bytes)

Notice that after the Temperature (Thermister) probe has been chosen the Units in the Unit and Scaling box has been set to ° C

Now give the Channel a meaningful Long and Short name in the Logger Channel Name box as shown below

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Click on the Write Unit, Scaling and Calibration values to the Logger button to send the new settings to the logger.

If you have use high accuracy thermisters no calibration will be required.

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PT1000 Application Notes

For PT1000 applications an excitation resister is required between the input line and the switched supply line. The excitation resister must have a value of 3k3 ohms and an error of 0.1% or less . Farnell Part no 433-093 or 339-672). Filter capacitors are required between the inputs and the common line. The channels must then be set to PT1000 mode using the OmniLog Software.      

Circuit for GP-HR with 3 PT1000 Temperature inputs

R1, R2 and R3 are 3k3 ohm ± 0.1%
Filter Capacitors are 0.1uF

GP-HR_PT1000_circuit_diagram.gif(5293 bytes)

Setting up PT1000 channels using the OmniLog Software

Connect the GP-HR logger to a computer and Run the OmniLog software

From the Logger Control Screen select Channel and Probe Setup

Select the Channel that you wish to setup (Ch 1, 2 or 3)

From the Probe box select the PT1000 (Unamplified) option as shown

omni_setup_pt10001.gif (18403 bytes)

Notice that after the PT1000 (Unamplified) probe has been chosen the Units in the Unit and Scaling box has been set to ° C

Now give the Channel a meaningful Long and Short name in the Logger Channel Name box as shown.

Click on the Write Unit, Scaling and Calibration values to the Logger button to send the new settings to the logger.

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