Jump to content

Jazz PT15 - problem with PT1000

Recommended Posts

Hi all,

I've been using a Jazz PT15 with 3 PT1000 sensors connected (measuring hot water at a boiler room) very well. I recently installed another PT15 in another room but this time the measurements are very unstable: temp shows correctly (40ºC for example) but jumps every few seconds to 36ºC or 45ºC...a huge gap! I tried the "high" filter, but inputs keep fluctuating a lot. I tested the sensors with another application and they are ok. PLC is grounded.

The only issue is that sensors cables run very near other 220V cables May those cables produce noise to the sensors? (I have done that before without any trouble, though).

Am I forgetting something / doing something wrong regarding PLC connections?

Any help will be highly appreciated!!

thanks in advance


Link to comment
Share on other sites

Hi Pedro,

definitelly the high power cables along with sensor ones emit noise and can be the reason for the problem. But before continuing and taking special care, can you make a simple test - connect the sensor with shortest posible cable direct to the controller and keep it in the air. Is the signal stable now?

Another one possible cause for the problem - where the sensors are located? Are the boilers grounded by themselves? Is thhe ground point the same as the one of the controller?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...