The Model 688 Heater consists of element assemblies mounted inside a stainless steel tube which is enclosed in an insulated jacket. The jacket allows maximum heat transfer to the air stream while maintaining a low surface temperature. This makes the model 688 ideal for mounting in vulnerable areas or in enclosures containing other equipment.
The inlet of the 688 is flanged and the outlet is either flanged or provided with a duct/hose adapter.The terminal box is manufactured from aluminium and is protected to IP65. Connection is made to each element using DIN rail termination for ease of wiring.
The Model 688 will give an outlet temperature up to 300°C and is available in loadings from 24 to 36kW. The inlet can be fitted with a thermal cut-out to protect the element in the event of the airflow becoming restricted.
A variety of temperature controls are available, ranging from switching devices to provide fixed loadings through to systems to monitor and regulate the output temperature. A range of adapters are available to couple the Model 688 with a variety of Secomak fans.