ABB C1300 User Manual page 38

C1300
Advanced circular chart recorder
Calculating The Count Rate Manually
The count rate determines how many units the totalizer increments per second when the flow input signal is at 100%. To calculate
this parameter manually, follow the procedure below:
1. Calculate the volume relationship
Typically the unit of measure used by the totalizer is larger than that used for displaying the instantaneous flow-rate. Use
standard conversion tables to calculate how many times the flow units used for the input will fit into the desired totalizer unit.
Example: Measurement channel units is set to gallons/minute. Instantaneous process flow-rate (engineering range) is 0-300
imperial gallons/minute, totalizer is required to increment in cubic feet. From standard conversion tables, 1 cubic foot = 6.229
imperial gallons.
2. Calculate the unit time
Ensuring that the time-base of the instantaneous flow-rate is used, the following equation determines how many seconds it will
take at full scale flow for a single totalizer unit to pass the measurement point:
Volume relationship

------------------------------------------------- -
number of seconds in time-base
Full scale flow
Example:
6.229 (imperial gallons in 1ft
--------------------------------------------------------------------------------------------
300 (imperial gallons max. flow rate)
3. Calculate the count rate
The totalizer count rate is the reciprocal of the result of the calculation above:
1
---------------------------------------------------------------------------------- -
Seconds to pass 1 totalizer unit
Example:
1
----------------- - =
0.803
1.2458
36
=
Seconds to pass one totalizer unit

3

60 (seconds in 1 minute)
=
Totalizer count rate
=
3
1.2458 seconds to pass 1ft
3 Configuration
IM/C1300 Rev. J