Yokogawa 414 Batch Controller - Manual (Page 24)

3.4 TOTAL CONVERSION
The Total Conversion feature enables the rate to be displayed in one engineering
unit (eg. gallons/minute) and the totals to be displayed in another engineering
unit (eg. barrels).
The Scaling Factor is always programmed in the unit relating to Rate, and the
Total Conversion constant is a division factor which can be used to convert the
totals to the different unit. The Total Conversion factor affects the net,
accumulated and gross totals and is limited between 0.01 and 2000.
For Example.
If the Rate is required in gallons per minute:
1. The Scaling Factor would be programmed as pulses per gallon.
2. The timebase would be programmed as minutes.
If the Totals are required in barrels:
3. The Total Conversion factor is programmed as 42 (there are 42 gallons in a
barrel). All totals, including the Batch Quantity and Batch Total, will now be
in barrels.
Some common units are given below together with the Total Conversion
constant (TOTCON) which should be programmed.
Rate* Totals TOTCON
Gallons (US)/ Barrels (oil) 42.000
Litres/ Kilolitres 1000
ml/ Litres 1000
Mgallons/ Acre-feet 0.32587
* Units per second, minute, hour or day. The timebase is programmed
separately during Calibration.
22 Operation