Situations where high discharge pressures are required often limit the use of diaphragm type dosing pumps. For such applications the JESCO FEDOS range comes to the forefront in capabilities.
The FEDOS range of pumps are capable of generating discharge pressures to 100 barG and the capacity of the range is 0.17 to 31.5 litres/hour. The FEDOS range is available in two categories. The FEDOS E which features a fixed speed motor and 0-100% stroke length adjustment, and the FEDOS DX which adds additional functions including stroke frequency and the capability of integrating into control systems.
FEDOS E pumps can be integrated in controls or automatic control systems. If no control is required for constant dosing, the motor is connected directly to the terminal box. FEDOS E is applied in thi case.
Three-phase and AC motors are available for FEDOS E pumps. To change the metering capacity, either the stroke length can be adjusted mechanically or the speed of the three-phase motor can be controlled by means of a separate frequency converter.
Using the advanced control system fitted to the FEDOS DX allows the adaption to a large number of different control signals and system monitoring equipment. For the chemical supply, for example, two controls are available: tank level control with alarm signal and low level indication. The signals required for external activation of the pump can be simple voltage-free closing contacts from water meters or controllers or analog 0/4-20mA signals. For internal control, the FEDOS DX can be adjusted continuously between 0 and max. 142 strokes/min, depending on the version. A single stroke follows each contact.