HA243821
Issue 5 Mar 98
Section5
Page 5 - 7
MODEL 346 INSTALLATION AND OPERATION MANUAL
Per second
Per minute
Per hour
Per day
1
60
3,600
86,400
1.0000
6.0000
3.6000
8.6400
0
1
3
4
Seconds
Mantissa Exponent (10n)
5.2 TOTALISER FACTOR (Cont.)
Commonly used Totalisation Factors are:
It is important to remember that the Totaliser reads the Channel Value. When configuring a channel, measured
values that would normally be expressed in more than five digits (e.g. 0 to 3,000,000 Gallons per Day), must be
ranged as a ratio of that number (e.g. 0 to 3,000 with a description of ‘Gal./ Day X 1000’. The totaliser would also
be counting in thousands of gallons. 3,000,000 Gallons would add 3,000 Counts to the Totaliser.
It is also possible to make the totaliser count faster than the rate from the source. To do this reduce the Factor
Exponent value by the scaling multiple. To scale the counting up by 1000, subtract 3 (10
3
) from the Factor
Exponent.
Note...
If the source is ranged 0 to 3.0 and the totaliser is scaled up by 1000, each 0.1 change in the source affects
100 counts; with a potentially large rounding error. Source ranging in this case should be 0 to 3.000 where
each 0.001 would represent 1 count.
To make a totaliser count more slowly, the factor is increased. Directly totalising 30,000 gallons per minute (a
factor of 6.0000 E 1) would add 43,200,000 counts per day and overflow the totaliser counter in 23 days. If the
Factor were scaled to count in thousands rather than units by changing the factor from 6.0000 E 1 (60) to 6.0000
E 4 (60,000); 43,200 Counts would be added per day - with each count representing 1000 gallons. The counter
would then take over 60 years to reach 999,999,999.
FACTOR CONFIGURATION
Operation of the ENTER key calls the following display:
TT1 Fact Man
X.XXXX Mant.
The mantissa part of the totaliser factor (calculated as described above) is entered using the up/down/side arrow
keys, followed by an operation of the ENTER key, which calls the next display:
TT1 Fact Exp
XX. Exp.
The exponent part of the totaliser factor is entered using the up/down/side arrow keys, followed by ENTER.
Exponents from -30 to +30 may be used. Operation of the CLEAR key calls the next page (totaliser units).
TOTALISER UNITS
TT1 Units
UNITS
The up/down/side arrow keys are used to enter a five character unit-of-measure for the totaliser number. Opera-
tion of the ENTER key calls the next display page.
