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13.2
Information about the Detergent Proportional Metering in Crate Washers
The proportional metering is based on the water volume detection in the fresh water pipe
and a cyclic metering time calculated from this.
A basic distinction must be made between acquisition of the total water volume and the
rinsing water volume. Depending on where the water meter is installed both the pre-metering
and the post-metering can be carried out in the proportional mode in the former case. In the
latter case the pre-metering must take place time-dependently, the proportional metering is
limited to rinsing mode.
As regards the enable signals, a filling signal from the machine is necessary for the pre-
metering. The belt transport signal or the rinsing signal (from the rinsing solenoid valve)
must be requested for rinsing mode.
Preconditions for correct proportional metering are:
• The measured water volume must completely reach the cleaning tank.
• The correct choice of water meter with correct setting of the pulse rates in the
BALANCING WATER METER? menu
Restrictions in the application of proportional metering
• Machines in which the rinsing water volume is divided and passed to the front cleaning
tanks in a bypass.
• Machines in which the rinsing is designed as a circulation and in which rinsing water can
only get into the cleaning tank via the level compensation.
Calculating the detergent metering time from the water volume:
The following values are required to calculate the metering time:
3. Desired detergent concentration
4. Calibration value of the detergent pump
The metering starts with throughput of every 10 l of fresh water.
Metering time
Example:
Concentration:
Metering rate off detergent pump: 12,000 g/h (200 g/min)
Metering time = [(10 l * 4 g/l) / 12 000 g/h] * 3600 = 12 sec
The minimum and maximum values for the metering sequence are given by the minimum
and maximum water flow volumes.
Water flow volume
The examples show that the metering process intervals depend exclusively on the water
flow volume.
On the basis of these examples the necessary pump size or the maximum settable
concentration can be determined. For example a water flow volume of 1,500 l/h and a
metering performance of 12,000 g/h (approx. 12 l/h) gives a maximum concentration of 8 g/l
(equivalent to a metering time of 24 s per 10 l water flow).
The range of fluctuation of the detergent concentration depends on the size of the tank. The
fluctuation range is less than 10 % of the nominal concentration at tank sizes greater than
100 l.
13.2.1
Additive proportional metering
Additive proportional metering takes place in the same way as the detergent proportional
metering.
The calibration of the additive pump and the desired concentration must be set in the
appropriate parameter menu of the Aquanta Control unit.
417101386_AquantaControl_II.doc
= (10 l * concentration) / metering performance of the detergent pump
150 l/h
1,500 l/h
4 g/l
metering processes / h
15
150
- 91 -
cycle time
240 s
24 s
Rev. 4-2/10
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