MAXICAL
®
III5511-229 GB/98.06/Rev. B1
7
2.2. Calculation
In MAXICAL
®
III, thermal energy is calculated after a given
amount of water has been recorded. The typical integration
interval is 10 litres with a Qn 1.5 m³/h flow meter and 1 m³, if a
Qn 120 m³/h to Qn 1400 m³/h flow meter is connected. The
thermal energy is derived by multiplying the volume of water by
the actual cooling and the relevant correction factor - derived from
Dr. Stuck’s k-factor table. Any remainder which cannot be dis-
played due to the resolution of the display will be saved and added
to the next integration. Pulse separation and the number of pulses
per litre, which ensure that the flow meter and the integrator tally,
is determined by the CCC program.
The current water flow and thermal power are calculated at 5
(CCC³ 100) or 30 (CCC<100) second intervals, depending on the
configuration selected, based on the no. of pulses emitted by the
flow meter during the given period of time. MAXICAL
®
III is
configured to an average flow and peak value, if a flow meter with
few volume pulses is connected, e.g. a mechancial meter with a
reed switch output (CCC<100).
2.3. Logging Peak Values
The highest thermal power - or the highest water flow - in each 24
hour period is stored in the memory, together with the date and
time for the measurement. The peak value for this period is the
highest average, determined over a period between 1 and 120
minutes as required, occuring between 2400 hours and 2400 hours
the next day.
The value is stored in the permanent EEPROM memory and - as
with all other data - covers the last 31 days.
2.4. Measuring Temperature
MAXICAL
®
III can measure flow and return temperatures be-
tween 0.01°C and 182.00°C. Temperatures measured which
exceed these limits will be registered as sensor faults after 10-20
minutes - please refer to section 2.6. Information Codes.
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