Blind Dial Proportional Temperature Controller
This is a Low cost controller, Analog Dial
Temperature Controller. It is also called Blind
Controller. This essentially means Open Loop, just
control the fuel or energy input to the system to
regulate heat. This is not a Blind Controller that
way, it only cannot display the temperature value,
that could be another reason it is called blind.
digital display for PTC1000
Dial cyclic timers were used to control heat,
these were purely mechanical clockwork devices.
They could regulate well, when the material flow
(liquid) is constant and mains power is regulated.
But when the job to be heated, varies in quantity,
control temperature is close to ambient or when a
precise control is required; closed loop
controllers are used. Even a thermostat is like
closed loop, as the bimetallic sensor is
temperature dependent. But not good enough.
Zone Temperature Controller
This controller is closed loop, precision
controller, only the digital display of
temperature is absent. Fine one deg variations may
not be easy in this.
It is for J Thermocouple you can calibrate it
with boiling water and Ice. Or if you have the
millivolt source you can calibrate it with that.
The 1K RKE 1W is the Dial Potentiometer, You have
to fix a dial and Knob. Calibrate the Dial with
markings of temperature.
These controllers are used along with PLCs and
Embedded Systems based controllers. When the
Advanced controllers fail. The Analog controllers
trip the power and protect the Job or Material
getting burnt out.