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5.7 Calibration Data
The calibration data menu allows the user to enter up to 5 points of calibration data for their
flow meter; if the RT40 was purchased integrally mounted to a flow meter then the calibration
data will be factory set.
Upon entering the calibration data menu the user is able to enter up to 5 points of
calibration, with each point of calibration requiring a frequency value and a K-factor.
Frequency values are to be entered in Hertz (pulses/second) and can be entered with up to 4
whole numbers and 1 decimal place. K-factor values are to be entered in Pulses/Litre with up
to 6 whole numbers and 4 decimal places.
It is very important to note that K-factors are always entered in units of Litres regardless of
the units chosen for the display.
If a single point of calibration is to be entered, the frequency value is not important and any
non-zero value can be entered here. After entering a non-zero value for frequency the K-factor
for the flowmeter may be entered. Please note, if there are no non-zero frequency values
entered the RT40 will operate as if the K-factor has been set to 1 Pulses/Litre.
When entering multiple points of calibration the user must calculate the frequency for each
calibration point, which can be done as follows:
.
÷ 60 = ()
Example: for a calibration point at 50 L/min with a K-factor of 107 Pulses/Litre the user
would enter a frequency value of 89.2Hz and a K-factor of 107 Pulses/Litre
Calibration points may be entered in any order, it is not necessary to enter them in ascending
frequency order. However, if any point is entered with a frequency value of zero then all
remaining calibration points will be disabled. If data is entered for the first 3 points of
calibration, and point 4 is entered as zero Hz then points 4 and 5 will be disabled and the RT40
will operate with 3 points of calibration.
For users with a QS200 or QS100 ultrasonic water meter; the calibration data to enter should
be a frequency of 1Hz, and a K-factor selected from the “Reference Pulses/Litre” column of
the K-factor table in the QS200 or QS100 instruction manual. Please note that the correct
Pulses/Litre number must be selected based on your pipe size and your pipe schedule.
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