I recently encountered a Thermistor for the first time and have a question regarding its installation. The Thermistor in question is a 10KOhm 4-20mA 2-wire device. I need to connect it to a Siemens 8 Channel Analog Input card (part number: 6ES7331-7KF02-OABO) after removing an old Teletron card. Can I simply connect the positive wire to the MO+ terminal and the negative wire to the MO- terminal on the Siemens card for a proper setup?
Here are some useful guides that will assist you. Please ensure that the order number you provided includes zeros, not the letter "O."
A thermistor is a type of passive resistance element that can have either a negative or positive temperature coefficient, resulting in a highly non-linear response. In contrast, an analog input card is specifically designed for a Pt100 RTD, another type of passive resistance element with a positive temperature coefficient that offers a more linear response. Configuring the AI card for a Pt100 input may produce inaccurate temperature readings, especially if the thermistor's temperature coefficient is negative. This could lead to the temperature values moving in the wrong direction due to the significant differences in resistance ranges, potentially causing the card to malfunction. If a Teletron card is a signal conditioner that can linearize the thermistor signal and provide a common high-level voltage current output, it is advisable to use the signal conditioner instead of relying on distorted temperature values from connecting the thermistor to the AI card with a PT100 range.
parness45 inquired about the Thermistor, a 10KOhm 4-20mA 2-wire device. Can you please provide a photo of the sensor name plate? Additionally, if there is a transmitter, a photo of that would be appreciated. Take a closer look at the Thermistor specifications by clicking to expand.
Thank you for your responses, they are very helpful. I will gather some pictures and send them over soon. Before that, I need to research Thermistors as I am unfamiliar with their properties. I will share more information later today and we can proceed from there. Your feedback is valuable to me, thank you once again!
Connecting the thermistor should be relatively straightforward, although always ensure that you are complying with any necessary safety regulations before you make any changes to the system. Usually, the M+ terminal corresponds to the positive wire and M- to the negative one. This being said, 4-20mA output devices aren't typically polarized, meaning the specific plus/minus assignment may not matter for operation. However, you should also consider other elements like power supply, overvoltage protection, grounding, and isolation requirements. It's always a good idea to check the Siemens card manual or consult with their technical support.
While you're on the right track, it's a bit more complex when dealing with a 4-20mA system and a Siemens Analog Input card. You need to wire your 4-20mA device to your AI card through a loop power supply. The positive (+) from the power supply connects to the positive (+) on the 4-20mA device. The negative (-) from the 4-20mA device then connects to your first analog input (+) channel on the card (IA0+ if it’s your first channel and so forth), while analog input (-) goes back to the negative of your power supply. This creates a complete loop, necessary for current-based signals. So, you can't just connect directly to MO+ and MO-.
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Answer: 1. How do I wire a 10KOhm 4-20mA Thermistor to a Siemens 8 Channel Analog Input Card? - To wire a 10KOhm 4-20mA Thermistor to a Siemens 8 Channel Analog Input Card, connect the positive wire to the MO+ terminal and the negative wire to the MO- terminal on the Siemens card for a proper setup.
Answer: - The Thermistor mentioned in the discussion is a 10KOhm 4-20mA 2-wire device, which is suitable for connecting to the Siemens 8 Channel Analog Input Card.
Answer: - Yes, you can replace the old Teletron card with the Siemens 8 Channel Analog Input Card to connect the 10KOhm 4-20mA Thermistor for your application.
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