TECHNICAL DESCRIPTION
MULTICAL
®
41
5512-313 GB/01.2010/Rev. C1
5
1
General Description
MULTICAL
®
41 is a static
water meter
based on the ultrasonic principle. The water meter is based on experience
gained since 1991 of development and production of static ultrasonic meters.
The meter, which is intended for measurement of water comsumption in ”utility room environments”, has gone
through a very extensive OIML R 49 type test to secure a long-term stable, accurate and reliable meter. Some of
the many advantages of the water meter are among other things no wearing parts which improves the lifetime
significantly. Furthermore, the meter has a start flow of just 3 l/h which gives accurate measurements also at low
flow.
According to OIML R 49 the MULTICAL
®
41 can be described as a ”complete water meter”. In practice this means,
that flow sensor and calculation unit must not be separated.
If flow sensor and calculation unit have been separated and the seals thereby broken, the meter will no longer be
valid for billing purposes, and the factory guarantee will not longer apply.
MULTICAL
®
41 is based on ultrasonic measurement and a microprocessor technique. All circuits for calculation
and flow measurement are gathered in a single-board construction providing a compact and rational design, and
at the same time supreme measuring quality and reliability are achieved.
Volume measurement is carried out by means of bidirectional ultrasound technique according to the transit time
method which is a long-term stable and accurate measuring principle. Through two ultrasonic transducers the
sound signal is sent with and against the flow direction. The ultrasonic signal travelling in the flow direction will
reach the opposite transducer first, and the time difference between the two signals can subsequently be
converted into a flow velocity and thereby also a volume.
The accumulated water consumption is displayed in m
3
with seven significant digits and measuring unit. The
display is specially constructed to obtain a long lifetime and high contrast in a wide temperature range.
Other possible display indications are operating hour counter and current flow. MULTICAL
®
41 can also be
configured to show peak flow, information code (info code), customer number and segment test.
MULTICAL
®
41 is supplied from an internal lithium battery with a lifetime of up to 12 years. Alternatively, the
meter can be mains supplied, either from 24 VAC or 230 VAC.
In addition to the water meter’s own data, MULTICAL
®
41 displays accumulated consumption for two extra meters
that supply a contact signal to MULTICAL
®
41 via a Reed switch. The contact signals from the extra meters are
connected via the communication modules.
A multi-poled plug is placed under the top cover that is used partly for calibration and adjustment during
verification and partly in connection with communication modules. MULTICAL
®
41 is supplied with
communication modules f.x. for radio, M-Bus and RS232.