I cannot make pid shut off the heating element wen it gets to the desired temperature. I set for example 95 degrees Celsius Wen it starts the "out" Light is on and wen it reach 35celcius it turns off the heating element is still on even wen the temp gets over 95 degrees. And then wen temp is dropping at 40 degrees the out light starts blinking and at 35 stays on again.... Any idea?

 

hi emman,
Please post your circuit diagram.
E

 

When it starts the "out" Light is on and when it reach 35 celcius it turns off the heating element is still on even wen the temp gets over 95 degrees.

How does the temperature get to 95C if the heating element is OFF at 35C ?

 

I cannot make pid shut off the heating element wen it gets to the desired temperature. I set for example 95 degrees Celsius Wen it starts the "out" Light is on and wen it reach 35celcius it turns off the heating element is still on even wen the temp gets over 95 degrees. And then wen temp is dropping at 40 degrees the out light starts blinking and at 35 stays on again.... Any idea?

You have given us no information that will help us answer your question.
First, we need to know what you are using to control the heating of something.
Next, we need to see the circuit that you are using for control
ALSO, we need to know what you are using to sense the temperature.
After that, we will probably have other questions as well.

 

How does the temperature get to 95C if the heating element is OFF at 35C ?

The "out" Light is turning off not the heating element.

 

You have given us no information that will help us answer your question.
First, we need to know what you are using to control the heating of something.
Next, we need to see the circuit that you are using for control
ALSO, we need to know what you are using to sense the temperature.
After that, we will probably have other questions as well.

I'll post pics tomorrow from the box circuits etc. Thank you

 

hi emman,
Please post your circuit diagram.
E

I'll post tomorrow pics of the "box" Circuit and details. Thank you

 

Wiring diagram using a SSR to operate the heater element.

 

What I see in the circuit drawing in post #8 is a set of contacts in the controller being connected across a set of control contacts on the temperature controller. If that is the actual assembly connections I predict poor performance.
So it is entirely possible that after the SSR is switched on, it does not switch off. When operating devices outside of their specified conditions there is no obligation to provide proper operation.

 

What I see in the circuit drawing in post #8 is a set of contacts in the controller being connected across a set of control contacts on the temperature controller. If that is the actual assembly connections I predict poor performance.

It's actually a 4 to 20 ma source to activate the SSR on pins 4 and 5 of the controller. Why it's shown as a contact is not correct.

 

Operating an SSR from a 4-20 mA output is certainly a poor choice, That is sending an analog signal into a digital controller. There is no reason at all to expect the SSR to operate correctly.

 

What I see in the circuit drawing in post #8 is a set of contacts in the controller being connected across a set of control contacts on the temperature controller. If that is the actual assembly connections I predict poor performance.

It's actually a 4 to 20 ma source to activate the SSR on pins 4 and 5 of the controller. Why it's shown as a contact is not correct.

Terminals 4, 5 can be used for SSR control or for NO contact of relay, depends on product code ().

ADDED:
Picture of Rex-C100 model which works with SSR (pulse 0-12 V output).
ADDED:
Rex-C100, control output:


https://www.kalatec.com.br/wp-content/uploads/2020/02/Manual-Controlador-Temperatura-CTP.pdf

 

Having the output be a 4-20mA signal is an incredibly poor choice for driving a SSR to control a heater. The 12 volts ON/OFF option is the only one that makes any sense at all.
Do not fall into the "Jim Moore Syndrome" of thinking that if you want it to be true, it must be true. That is not how reality works.

 

The SSR only requires a few ma of current to operate.
The 4 to 20ma current output is designed for a SSR.

 

It is not clear to me how an analog output can correctly operate a solid state relay in a predictable manner. Please explain how that can be.

 

A 4mA > 20mA loop is normally terminated at the receiving end with say a 250R to 0V, this creates a +5V signal which is suitable for an SSR which requires +3V to 15V to operate.

 

A 4mA > 20mA loop is normally terminated at the receiving end with say a 250R to 0V, this creates a +5V signal which is suitable for an SSR which requires +3V to 15V to operate.

THAT is part of why connecting an SSR might be a cause for the problem that the TS is seeing.
THE TS should measure the voltage across the SSR input because it may not be adequate for switching it back off.

 

The TS never showed how the unit is wired or exactly which model they have.
One version has a 12 volt output for relays or SSR.
Right now it's all speculation.
I see that the TS is still lurking around but won't reply with any further details.