Pentair HAFFMANS RPU-352, Instruction Manual, Page: 48 / 112

HAFFMANS RPU 352, RPU 353, RPC 80 RPC 50
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Page 48 of 112 RPU 352, RPU 353, RPC 80, RPC 50
16.3 RESULTS
10) If the product temperature is exactly equal to the cut-off temperature will any PU’s be
achieved?
Yes, PU’s will be achieved and added to the total. The precise definition of the PU cut-off (see
“Results” section of the operating manual) is as follows: “At or above this temperature PU’s are
accumulated. Below this temperature they are not.”
This definition also applies to the timing result displayed as “Adding PU’s” but often printed as
“Time above cut-off”. The definition of the result has always been the same but in printed
results the headings used in the past were not always so precise.
11) The PU value displayed by the RPU-352, PRU-353 is not the same as that printed for the
same run by the RPC-80. Why?
Remember that the final output device dictates all settings for PU calculation, date and time.
The RPC-80 recalculates the results from the raw data based on values you choose when
setting up the RPC-80. The clock in the RPC-80 is also used as a reference for the file timing.
These features make it easy to maintain a plant-wide standard for PU calculations and the date
& time and to change those standards without making modifications to all the monitors. When
using the RPU-352, PRU-353 with the RPC-80 you must be aware that different standards for
PU calculation (including PU cut-off temperature) may apply to the displayed and printed
results.
The same applies when connecting the PU monitor to a PC. The settings you make in the
program running on the PC will take priority over the settings in the RPU-352, PRU-353 when
results are calculated for display or printing. File start time will be calculated using the clock in
the PC as a reference.
ONLY FOR PRU-353:
12) The maximum pressure value displayed by the PRU-353 is lower than that printed for the
same run by the RPC-80. Why?
The final output device dictates all settings for PU calculation, date, time, etc. and this also
extends to the pressure results. The previous answer gives more details.
The RPC-80 can be set to make a correction for errors introduced by the older pressure fittings
where the head space in the can is very small. These errors are very small for the more recent
pressure fittings and so these corrections are not made in the PRU-353. We recommend that
the head space correction in the RPC-80 is turned off. See the RPC-80 configuration manual.
13) Why is the file start time shown on the display of the RPU-352, PRU-353 almost an hour
different from the start time in the results printed by my PC?
The final output device dictates all settings for PU calculation, date and time. The previous
answers give more details. In this case the clock in the PC was probably adjusted automatically
for Summer Time (Daylight Saving) but you have not changed the clock in the RPC-353.
If the PU monitor is used with the RPC-80 printer/charger then the clock will be automatically