Eurotherm Chessell Recorders - Totalizer Configuration Tutorial

TOTALIZERS MADE EASY

(or what is a Totalizer Factor anyway?)

All Chessell Recorder totalizers act in the same way. The value of the input channel or DV is divided by the factor each second and the result is stored. Whole numbers are sent to the totalizer value as they are accumulated. The basic factor is the number of seconds in the measured unit-of measure, i.e.

FEET PER SECOND (FPS)	= 1.0 sec
GALLONS PER MINUTE (GPM)	= 60 sec
STANDARD CUBIC FEET PER HOUR (SCFH)	= 3,600 sec
MILLIONS OF GALLONS PER DAY (MGD)	= 86,400 sec

EXAMPLE: A flow of 100 GPM would have a factor of 60 (seconds). Each second at a constant 100 GPM, 100/60 would be stored. At the end of 60 seconds, the value would be 100/60 X 60 or 100 GAL.

The main difference between the different model recorders is how this factor is formatted. In the 340 and 392 recorders, it is in the following format (scientific notation):

FACTOR = MANTISSA x 10EXPONENT

While 4xxx recorders use simple multiplication:

FACTOR = PERIOD SCALAR x UNIT SCALAR

The factor in a 5000 series recorder is entered solely as the period scalar.

In either case, any scaling should be done by adjusting the unit scalar. The period scalar should be left as shown below.

340 AND 392 FACTORS		MEASURED VALUE	4000 SERIES FACTORS		5000 SERIES FACTORS
MANTISSA	EXPONENT	TIME UNITS	UNITS SCALAR	PERIOD SCALAR	UNITS SCALAR	PERIOD SCALAR
1.0000	0.0	PER SECOND	1.0000	1	1	1
6.0000	1.0	PER MINUTE	10.000	6	1	60
3.6000	3.0	PER HOUR	100.00	36	1	3600
8.6400	4.0	PER DAY	100.00	864	1	86400
8.6400	1.0	PER DAY x1000	0.1	864	1000	86400

Click here for our Easy Totalizer Configurator

Last Updated Monday, July 18, 2005