Tecfluid CP420R - Manual (Page 7)

7
i/l n = New Pulses per litre Factor = ? (2.089)
3.2 Serial number indication
By pressing the three push buttons, the display will show the serial number. To return to
the usual screen, press any of the push buttons.
3.3 Reset
By pushing the RESET push button, the counter will be set to zero and it will continue
counting.
4 MAINTENANCE
It does not require any special maintenance.
5 MEASUREMENT ERROR CORRECTIONS
The calibration of the mechanical flowmeters is made with water at 20 o C to obtain a
calibration for a liquid of density 1 kg/l and viscosity of 1 mPa·s. If the flowmeter is used
with a liquid of other characteristics from the above specified or due to turbulences in the
flow, measurement errors can be induced.
To correct these types of errors we can modify the pulses per litre factor programmed in
the instrument.
Example 1 - Shortage of volume
If we have a flowmeter body which specifies i/l = 1.985, and when we check the volume
of a batch, we find that instead of having 100 litres as programmed, we only have 95 litres
(5% less) and we must apply the following correction:
i/l = Original Pulses per litre Factor = 1.985
V = Expected Volume = 100
Vr = Real Volume = 95
In a CH420R, if during the programming sequence it receives a HART command that
must be attended, the local programming will not be valid and all the data previously
programmed will be lost. The screen will return to the normal working model and the word
PROG will light on the screen, indicating this event. To remove the word PROG from the
display, press any of the two PROG push buttons.
i/l n = i/l
V
Vr