TECHNICAL DESCRIPTION MULTICAL® 21 & flowIQ® 2101 /..02 /..03
36 Kamstrup A/S •Technical Description • 5512-897_J1_GB • 06.2016
9.4 Operating pressure
In order to avoid formation of air bubbles or vapour in the meter (cavitation) – and to ensure correct
measurement under all circumstances – the operating pressure in the pipe installation must observe the test
conditions of OIML R49, which means that the static pressure downstream, immediately after the meter (the
downstream) must always be minimum 0.03 MPa (0.3 bar).
10 Reading and data
10.1 Reading
The meter will be read in three different ways:
• Visual reading of the legal display
• Receiving the Wireless M-bus signal, emitted at intervals of 16 or 96 seconds, depending on the
meter configuration
• Reading via the optical eye, e.g. by means of Kamstrup A/S’ wireless optical reading head, or optical
reading head with USB connector.
10.2 Volume measurement
The meter calculates water flow currently according to a fixed measuring cycle.
When the meter is in normal mode, a measurement is carried out every four seconds, and after a total of
32 seconds the meter reading is updated in the display.
Every 24 hours the meter reading is saved in the daily register. The register includes data for the latest 460
days.
The daily register can be read via the optical eye.
The Wireless M-Bus signal always includes current meter reading.
10.3 Data function: Target volume
The water meter saves the meter reading on the first day of the month in the target volume register. Data
is stored in the monthly register. The register includes data for the latest 36 months.
The Wireless M-Bus signal includes target volume of current month if selected during customer specific
configuration. The customer can select whether the Wireless M-Bus signal is to include target volume of
current month or max flow of latest day or month, plus a number of combinations of water and ambient
temperature – see paragraph ‘Optional register in data logger’.
Reading the target volume is suitable for use by the waterworks settlement with the consumer.
The complete register of target volumes for the latest 36 months, can be read by means of the optical eye.
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