Using Limpet Heaters to Keep Mass Flow Meters from Viscous Blockages
An AlphaLimpet heating system fitted to a Coriolis mass flow meter.
There are a number of types of flow meter used in industrial applications, including Coriolis meters and electromagnetic flow meters. Limpets can be fitted onto almost every type of flow meter that requires heat to prevent cool down of product during stationary batching cycles.
Where other technologies may struggle to impart heat or have reduced lifecycle due to deterioration or burn out, Limpet heaters provide accurate temperature control where it is needed by using custom designed, profiled aluminium adaptor blocks that fit snugly to the meter body and provide a heat reservoir.
Meters can be heated using several different types of Limpet:
For accurate temperature control the microprocessor controlled AlphaLimpet.
For fixed pre-set temperature control up to 250°C the BetaLimpet, MicroLimpet, OmegaLimpet or DeltaLimpet.
For variable, accurate temperature control (using a temperature dial), the MaxiLimpet.
For larger meters requiring multiple heaters, an AlphaLimpet or MegaLimpet in combination with 'slave' MicroLimpets or BetaLimpets.
Manufacturers whose meters can be heated by Limpets
Limpet heaters can be used to heat most brands of mass flow meter, including those produced by ABB, Burkert,Bronkhorst, Emerson (Micro Motion), Endress + Hauser, Grayco, Kobold, Krohne, Oval, Riels, Siemens, Sierra, and Yokogawa.
An AlphaLimpet heating system fitted to a Coriolis mass flow meter. Note the two 'saddle' adaptor blocks that are used to transmit heat from the AlphaLimpet into the meter body.
Coriolis meter with an AlphaLimpet heater - The Limpet Heating Story
The installation consisted of a tank linked to a centrifugal pump and Coriolis meter, both of which required heating to a temperature of 80°C.
An AlphaLimpet provided accurate temperature control and was mounted onto an aluminium heat transfer plate that was attached to two custom-designed aluminium 'saddle' blocks that fitted snugly onto the body of the Coriolis meter.
The saddles were secured to the meter using U-bolts, enabling simple and rapid installation and providing excellent heat transfer into the meter body.
Although the system was not insulated, the heating system worked perfectly, despite the relatively high temperature required.