Metering chemicals in hazardous areas requires a metering pump that is safe reliable and often suitable to be controlled from an external signal.
The ProMinent® Extronic series metering pumps are manufactured to suit all the above demands and carry an Australian Certificate of Conformity No AUS Ex3535, type of protection Ex d IIC IP65 Class I Zone 1. The EXBa E version is suitable for use in hazardous, explosive locations in compliance with Zone 1, Group 11, while the version EXBa S is used in firedamp endangered mining areas underground. The ProMinent® Extronic conforms to the unified UE standard EN50014/50018 for "flameproof enclosure". It carries the highest closure class for this protection type. This standard is recognised in many other countries outside the UE.
Three types of control are available:
Manual Control: Stroke setting 1:10, stroke rate setting 4-100% giving an overall manual turndown of 250:1
External Control: Relying on an external switching contact to vary the stroking rate.
Analogue: 0/4-20 mA signal. The mA signal is connected direct to the pump.
The pumps are provided with electrical connection cables leading from the pump for power supply, contact or analogue control. With control versions, manual stroke length setting is 10:1.
ProMinent® Extronic metering pumps have a capacity range from 0.23 l/h up to 60 l/h at back pressures of up to a max. of 25 bar, with operating voltages up to 500V. The microprocessor electronics ensures operational and functional reliability as it compensates fluctuations in the mains voltage.
Features such as short-stroke solenoid drive and external control are integrated in the pump housing where the drive is not only "EX" protected but also features moisture protection to IP65 in compliance with DIN 40050.
IN the EXBa version, the "external contact" and "analogue" control inputs are available intrinsically safe and approved in accordance with EN50020. The materials used for the ProMinent® Extronic series liquid ends are Plexiglass, Polypropylene, PTEF-Teflon, stainless steel 1.4571 or in SB version for combustible media.
For higher viscosity media, liquid ends in PP4 with Hastelloy C springs is available for sizes 1002, 1006, 1310 and 0814. Self-bleeding liquid ends are available in Plexiglas and PVC for gaseous chemicals.