TECHNICAL DESCRIPTION MULTICAL
®
401
5512-091 GB/02.2008/Rev. J1
27
7 The calculator
7.1 Measurement and calculation
MULTICAL
401 uses time based integration, i.e. the calculations of accumulated volume and energy are carried
out at fixed intervals irrespective of the actual water flow. In normal mode MULTICAL
401 has an integration
interval of 28 sec., whereas in ”fast mode” it has an interval of 4 sec.
”Normal mode”
In normal mode MULTICAL
401 has an integration sequence of 28 sec. Through this sequence the water flow is
measured at an average interval of 3.5 sec. Flow and return temperatures are measured in the middle of the
sequence and at the end of the sequence, the energy and volume calculations are made. All display values are
updated at an interval of 28 sec. In addition, the display showing actual flow is updated at an interval of 14 sec.
”Fast mode”
In fast mode MULTICAL
401 runs through an integration sequence of 4 sec. Through this sequence the water flow
is measured at an average interval of 1 sec. Flow and return temperatures are measured in the middle of the
sequence, and at the end of the sequence, the energy and volume calculations are made.
All display values are updated every 4 seconds.
7.2 Push buttons
MULTICAL
401 has a front key for display change. During normal operation the display shows the accumulated
thermal energy in kWh, MWh or GJ, depending on the programming selected.
When the front key is activated the display will move to accumulated volume, hour counter, flow and return
temperatures etc. (See section 3.3.1 C
onfiguration of display).
If the front key is activated for 4 sec., the display changes to a submenu indicating secondary registers, e.g. Input
A, Input B, target data, tariffs, and customer number.
Figure 15
Under the transparent top cover an internal push button ”P” is found. This button is used during verification of
the meter (see section 13
Calibration and verification).
”P” button
Front key
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