What are thermal protectors ? How they are different from RTDs & thermocouples

What are thermal protectors ? How they are different from RTDs, thermistors, Pt100, pt1000 & thermocouples ?

What about thermik S06 ?

**broken link removed**

What should be its resistance at a particular temperature ? (temperature Vs Resistance Chart)

With what component can we replace it ?

thanks

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

What are thermal protectors ?

Click to expand...

In this case , bimetal switches.

What about thermik S06 ?

Click to expand...

Design:
These switches are equipped with a high capacity contact
mechanism, wherein the bimetallic disc can move freely,
without the current flowing through it. An additional spring disc
maintains constant contact pressure until reaching its switching
temperature.
The connecting lead wires are welded on, to ensure the use of
the switch under high temperature and strong currents without
problems.

Operation:
If the rated switching temperature of the bimetallic disc is reached, this suddenly snaps over
and opens (C06/S06) or closes the contacts (C06/C08). After cooling down to under its
resetting temperature, the contact mechanism returns automatically to its initial position.

Versions:
S06 / S08 with insulation cap
C06 / C08 without insulation cap

What should be its resistance at a particular temperature ? (temperature Vs Resistance Chart)

Click to expand...

Resetting temperature (RST) Standard: NST 60°C - 200°C: > 35°C

--for NC component :
if switching temperature is 100°C , then T > 100°C , switch is open ,R = infinite ..... look picture with hysteresis

--for NO component :
if switching temperature is 100°C , then T > 100°C , switch is closed = 0 ohm ..... look picture with hysteresis

With what component can we replace it ?

Click to expand...

for example:

http://www.devale.com/bimetal-thermal-protector/

http://www.devale.com/

try google "bimetal switch" or "bimetallic switch"

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

How to test this component ?
What should be its output & how to measure it ?

thanks a lot though

---------- Post added at 00:12 ---------- Previous post was at 00:11 ----------

Can't we use any thermocouple whether J type or K type OR any thermistor whether PTC or NTC ?

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

How to test this component ?
What should be its output & how to measure it ?

Click to expand...

Connect resistance meter to component wires
-read ohm value (1) in room temperature
-heat component over temperature switching point
-read ohm value (2)
-let component cool down to room temperature
-read ohm value ( shoul be same as (1))

Normally closed = in room temperature ...0 ohm and over switching temperature ....infinite
Normally open = in room temperature ....infinite and over switching temperature ...0 ohm

Look picture in post #2 , switching versus temperature

Can't we use any thermocouple whether J type or K type OR any thermistor whether PTC or NTC ?

Click to expand...

They are temperature sensors, not switches.
If wanted to use them as temperature switches, a smart relay for temperature monitoring is needed.

for example....
ThermoCouple Trip Relay
Designed to monitor thermocouples and provide a relay signal
if the temperature being monitored exceeds the pre- set limit.

**broken link removed**

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

In this particular example, what is the temperature switching point ? And, what would be the temperature of " over temperature switching point ?"

Are S06 normally closed ?

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

so, with the use of thermocouple trip relay we can convert temperature sensors into temperature switches ??? is it right ?

How & when this relay trips ? And, what's the advantage of using this relay ?

When the temperature (set point or set value) of the controller exceeds it would trip the output but there's also an option present in the temperature controllers, so, what's the need of it ?

thnXXX

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

what is the temperature switching point

Click to expand...

Technical details of S06:
**broken link removed**

so, with the use of thermocouple trip relay we can convert temperature sensors into temperature switches ??? is it right ?

Click to expand...

Yes...

How & when this relay trips ? And, what's the advantage of using this relay ?

Click to expand...

Look datasheet...

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

What did you show with the arrow of Reset Temperature ?

Temperature switching point is 100 degree celsius ???

05 is the tolerance ??? means 5 % of tolerance ???

thanks

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

what's the difference between temperature controller & thermocouple trip relay ?
What's the difference between temperature switch & temperature sensor ? Also, the difference in their application (the way they used) ?

thanX

Re: What are thermal protectors ? How they are different from RTDs & thermocouples

What did you show with the arrow of Reset Temperature ?
Temperature switching point is 100 degree celsius ???
05 is the tolerance ??? means 5 % of tolerance ???

Click to expand...

Nominal switching temperature (NST) in steps of 5 °C : 70 °C - 200 °C
Standard tolerance: ± 5°K

Reset temperature range below NST (UL / CSA) :
depends on Nominal Switching Temperature

Switching hysteresis in °C = Nominal Switching Temperature °C - Reset temperature °C

---------- Post added at 19:45 ---------- Previous post was at 18:42 ----------

what's the difference between temperature controller & thermocouple trip relay ?

Click to expand...

What Are the Different Types of Controllers, and How Do They Work?

There are three basic types of controllers: on-off, proportional and PID.
Depending upon the system to be controlled, the operator will be able to use one type or another to control the process.

On/Off Control
An on-off controller is the simplest form of temperature control device. The output from the device is either on or off,
with no middle state. An on-off controller will switch the output only when the temperature crosses the setpoint.
For heating control, the output is on when the temperature is below the setpoint, and off above setpoint.
Since the temperature crosses the setpoint to change the output state, the process temperature will be cycling continually,
going from below setpoint to above, and back below. In cases where this cycling occurs rapidly, and to prevent damage
to contactors and valves, an on-off differential, or “hysteresis,” is added to the controller operations.
This differential requires that the temperature exceed setpoint by a certain amount before the output will turn off or on again.
On-off differential prevents the output from “chattering” or making fast, continual switches if the cycling above and below
the setpoint occurs very rapidly.
On-off control is usually used where a precise control is not necessary, in systems which cannot handle having the energy
turned on and off frequently, where the mass of the system is so great that temperatures change extremely slowly,
or for a temperature alarm. One special type of on-off control used for alarm is a limit controller.
This controller uses a latching relay, which must be manually reset, and is used to shut down a process when a certain temperature
is reached.

Proportional Control
Proportional controls are designed to eliminate the cycling associated with on-off control.
A proportional controller decreases the average power supplied to the heater as the temperature approaches setpoint.
This has the effect of slowing down the heater so that it will not overshoot the setpoint, but will approach the setpoint and
maintain a stable temperature. This proportioning action can be accomplished by turning the output on and off for short time intervals.
This "time proportioning" varies the ratio of “on” time to "off" time to control the temperature.
The proportioning action occurs within a “proportional band” around the setpoint temperature.
Outside this band, the controller functions as an on-off unit, with the output either fully on (below the band) or fully off (above the band).
However, within the band, the output is turned on and off in the ratio of the measurement difference from the setpoint.
At the setpoint (the midpoint of the proportional band), the output onff ratio is 1:1; that is, the on-time and off-time are equal.
if the temperature is further from the setpoint, the on- and off-times vary in proportion to the temperature difference.
If the temperature is below setpoint, the output will be on longer; if the temperature is too high, the output will be off longer.

PID Control
The third controller type provides proportional with integral and derivative control, or PID.
This controller combines proportional control with two additional adjustments, which helps the unit automatically compensate
for changes in the system. These adjustments, integral and derivative, are expressed in time-based units; they are also referred
to by their reciprocals, RESET and RATE, respectively. The proportional, integral and derivative terms must be individually adjusted
or “tuned” to a particular system using trial and error. It provides the most accurate and stable control of the three controller types,
and is best used in systems which have a relatively small mass, those which react quickly to changes in the energy added to the process.
It is recommended in systems where the load changes often and the controller is expected to compensate automatically due to frequent
changes in setpoint, the amount of energy available, or the mass to be controlled.

https://www.omega.com/prodinfo/temperaturecontrollers.html

Thermocouple trip- and monitoring relays are
designed to monitor thermocouples and provide a relay
signal if the temperature being monitored exceeds the preset
limit.

Manual reset.
Once the relay has deenergised
it will stay de-energised regardless of the
temperature being monitored.
The relay can only be reset
via the reset push button on the front of the unit.

Auto reset.
Automatically resets once the temperature has dropped
below the trip point

Theoretically temperature trip relay can be used as thermostatic switch ( ON/OFF control)

MONITORING RELAYS
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What's the difference between temperature switch & temperature sensor ?

Click to expand...

temperature switch
is a component with fixed or adjustable on- and off setpoint output is switch function ( closed or open )

temperature sensor
is a component which output is proportional to ambient temperature
output signal can be voltage, current, resistance, etc.

Also, the difference in their application (the way they used) ?

Click to expand...

As above