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Blind Dial Analog 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.

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.

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.

Blind Temperature Controller

PCB Boards for Blind Controller –

Discussions –

Wandel and Goltermann – Communication Instruments

Just like Rohde and Schwarz which is a world leader in Communications Test Equipment, There was another from Germany called Wandel and Goltermann which made specialized RF Test Instruments.

A short history is Wandel and Goltermann became Wavetek Wandel Goltermann (WWG) and then Acterna, Now it is a part of JDSU Communications Test & Measurement.

See also Willtek Company History

Here are scans of a old catalog of Wandel and Goltermann.

Wandel and Goltermann

From Electronic Catalogs

Brief Introduction of WG

From Electronic Catalogs