C1300
Advanced circular chart recorder
3 Configuration
36
IM/C1300 Rev. J
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:
Example:
3.
Calculate the count rate
The totalizer count rate is the reciprocal of the result of the calculation above:
Example:
Volume relationship
Full scale flow
--------------------------------------------------
number of seconds in time-base
Seconds to pass one totalizer unit
=
6.229 (imperial gallons in 1ft
3
300 (imperial gallons max. flow rate)
--------------------------------------------------------------------------------------------
60 (seconds in 1 minute)
1.2458 seconds to pass 1ft
3
=
1
Seconds to pass 1 totalizer unit
-----------------------------------------------------------------------------------
Totalizer count rate
=
1
1.2458
------------------
0.803
=
