ProMinent Fluid Controls has launched the Delta precision diaphragm dosing pump which features an innovative pump drive system to give outstanding flexibility in dosing and control
This new 'optoDrive' system is a controlled solenoid drive system which extends the pump's capability to include continuous dosing and offers increased safety thanks to the integrated 'optoGuard' hydraulic monitoring functions.
The new drive allows a slow pressure output stroke to be set for almost continuous dosing or a fast stroke to be set for pulsed dosing.
In addition, the pressure of the suction stroke can be adjusted to give greater control over a wide range of applications.
The combination of different suction and stroke lengths means that the pump can be easily adapted to the properties of the dosing medium and to the process conditions.
Slowing down the suction stroke is particularly suitable for highly viscous or outgassing fluids.
This flexibility ensures that the Delta pump can handle a wide range of applications, thus reducing the need to have additional pumps or accessories.
'optoDrive' operates using a position sensor which detects the diaphragm displacement and reports it to a microprocessor.
During the stroke, the microprocessor permanently compares the diaphragm position with the predefined target data, while the solenoid drives the diaphragm.
The drive also automatically compensates for possible backpressure fluctuations which otherwise would have a negative effect on the dosing accuracy.
The Delta series of pumps has capacity of up to 80l/h at 2bar backpressure or up to 10l/h at 16bar, with an extensive capacity adjustment range.
A capacity range of 1:36,000 can be achieved on a single pump by adjusting both stroke frequency and volume.
The maximum stroke frequency is 200 strokes/minute (or 12,000 strokes/ hour).
For almost continuous dosing the stroke frequency can be set to up to 20 strokes per hour, ie, a slow pressure stroke can be extended to up to three minutes.
The stroke volume can also be independently reduced to up to 30% of the maximum value.
If continuous dosing is not required, the pump stroke rate can be reduced down to one dosing stroke per hour.
The new pump also has a number of safety features thanks to the 'optoGuard' integrated injection control system which ensures that the desired dosing quantity actually enters the process.
'optoGuard' can detect blocked dosing points or broken dosing lines, making the process safe and protecting the environment against a possible leakage of the dosing medium.
The optoGuard system also detects air or gases locked in the liquid end of the pump which would prevent dosing of the correct quantities.
The pump display shows the relevant error messages in full text.
Depending on the type of fault, the plant operator can determine whether the dosing is to be automatically stopped or, for example, a message is to be sent to the process control system via a field bus.
The Delta pump has almost no wear because the drive has only very few movable parts.
Low maintenance and a long life ensure very low operating and life cycle costs for the user.
