Normal-resistance elements are widely used across industrial heating because they are reliable, predictable and relatively simple to control.
Unlike elements whose resistance changes significantly as they heat up, a normal-resistance element has a comparatively stable resistance from cold to operating temperature. This produces a consistent electrical load and makes it well suited to thyristor power control.
They are commonly found in:
Typical industries include plastics, food and drink, packaging, chemicals, pharmaceuticals and general manufacturing.
Normal-resistance elements are popular because they offer:
They are particularly effective where the process requires dependable, repeatable heat without the high cold-start currents associated with specialist elements such as silicon carbide or molybdenum disilicide.
For most normal-resistance loads, zero-cross burst firing is the preferred control method.
The thyristor controller switches complete mains cycles on and off in response to the heating demand. This provides accurate power control while keeping electrical noise and harmonic disturbance low.
Key benefits include:
Faster cycle control may be used for low-mass heaters or processes requiring a quicker response. Phase-angle control is generally only needed where there is a specific requirement for soft start, voltage limiting or very rapid power adjustment.
REVO S is ideal for straightforward normal-resistance heating applications requiring reliable solid-state switching.
It is well suited to:
REVO C is recommended where the application requires more advanced control, monitoring or communications.
It offers options including:
Correct selection depends on the supply voltage, number of phases, heater current, control signal and required diagnostics.
Send us the following details:
Our power-control specialists can help you size the controller, select the correct firing mode and identify the most suitable REVO product for your application.
Call 01323 811 100 or send us your application details today.
