conductivity controlled pumps

conductivity-controlled pumps

In many applications the set-value of the concentration of a chemical product in a solution shall be achieved in spite of different disturbance factors. This is very important for example in professional dishwashing: if the concentration of the detergent is too low, the hygienic requirements are not achieved. If the concentration is to high, the machine isn't operating economically and dishes made of plastics and metal can even be destroyed.

Here the conductivity-controllers are a good choice: conductivity-sensor either with conductive or inductive principle measures the electrical conductivity in the washing water. As the normally used detergents because of their chemical contents have high conductivity-values, the measurable electrical conductivity is proportional to the concentration of the detergent in the washing water. if the concentration of the detergent decreases because of the dirty dishes or because of additional fresh-water, the electrical conductivity, measurable at the sensor decreases as well. The conductivity-controller recognizes the change and initiates a dosage of detergent. So the set-value is achieved again.

A complete controller-system exists of a conductivity-sensor, a conductivity-controller and a controlled equipment like a pump for dosing the electrical conductible product. In the following table you find combined devices, where a peristaltic pump is controlled by a microprocessor-based conductivity-controller in a single housing.

Model	Compact L plus	DSP 9630 mcs	Concept 2114 / 2115	Concept 2105 / 2106

applications	glas-, Hauben- and small Korbtransport- and small conveyor machines	glas-, pass-through- and small / medium rack conveyor washers	glas-, pass-through and small to big conveyor washers	gläs-, pass-through and small to big conveyor washers	package-drum and bottle-washers
rate of delivery [ml/min]	100	166	150 (250) / 500	150 (250) / 500	833
Max. dosage quantity [ml/h] f.e. basic filling of machines	6.000	2.500	9.000 / 12.000	9.000 / 12.000	25.000
recommended max. dosage-rate (long-term operation) [ml/h]	6.000	2.500	5.000 (7.500) / 12.000	5.000 (7.500) / 12.000	25.000
range of conductivity [mS/cm]	0,5 -12 0,5 - 25 (alternativ)	0,5 - 25 15 -120 (alternativ)	0,5 - 25 15 - 120 (option)	0,5 - 25 / 15 - 150	0,5 - 25 15 - 120 (option)
principle of measurement	conductive	conductive	conductive	inductive	conductive or inductive
recommended sensor	EE 10-3/8 (shipped with device)	EE 65-25-10	EE 65-25-10	ILFS 02	EE 65-25-10 or ILFS 02 or ILFS02-TK2
surveillance of process-errors	dosage time surveillance	dosage time surveillance	dosage time surveillance	dosage time surveillance	dosage time surveillance
process visualisation	1 LED	2 LEDs	3 LEDs	3 LEDs	4 LEDs
detection of damaged pump tube	yes	yes	yes	yes	4 LEDs
package-drum-empty-surveillance	-	-	yes	yes	4 LEDs
external warning signal (output)	-	-	yes	yes	yes
time-controlled basic dosag (for filling of machines with fresh water)	-	-	yes	yes	yes
wall-thickness of pump tube	1,6 mm	1,6 mm	2,4 mm	2,4 mm	2,4 mm
pump tube (standard)	PS 140 PH	PS 140 PH	DPSN 136-4,8x2,4 PH / PS 136-6,4x2,4 PH	DPSN 136-6,4x2,4 PH / PS 136-6,4x2,4 PH	PS 230-6,4x2,4 PH
tube retainer system	9911	8811	9911	9911	9310
tube connector for assembled tubes	5 x 1,5 mm	6 mm	6 mm (4 mm)	6 mm (4 mm) / 6 mm	8 mm
dimensions in mm (B x H x T)	65 x 135 x 82	170 x 150 x 90	94 x 170 x 130	94 x 170 x 130	320 x 190 x 93
mounting dimensions (B x H)	120	188 x 88	67 x 100	67 x 100	238 x 130
article-number	10090	10070	10086 / 10091	98235 / 98267	10087