Lutz TR90-PP, Руководство по эксплуатации

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5. Technical description
5.1 Display
Flow meter TR90 has an LC display with 6 mm high
digits. Displayed is the 5-digit flow volume, the unit
of measure (Litres, US-Gal, UK-Gal) and low battery
capacity.
Minimum digital step of the measured value is 0.02
litres, minimum digital step of non-resettable totalizer
is litre.
5.2 Keypad
Keypad with keys “Total”, “Reset” and “Mode”.
5.3 Battery
Lithium battery (type CR /2 AA, ,6V, 200 mAh) with
a minimum operating life of approx. 0 years with a flow
rate of .000.000 litres during this period.
The battery can be replaced after opening the housing.
Totals and calibration values are not affected by the
replacement.
5.4 Acquisition of measured values
The flow meter is recording pulse signals from the meas-
uring chamber.
Unit of measure and calibration factor are memorized
and read out failure-free.
5.5 Directions of measuring accuracy
Maximum measurement accuracy of ± % is only
reached if calibration factor is adjusted to the respec-
tive application.
Different causes can influence the intended measuring
accuracy.
. Viscosity of liquid
2. Type of liquid
. High pulsation and flow rate of the delivering pump
4. Mounting conditions
If measuring accuracy is not satisfactory, the flow meter
must be re-calibrated.
A recalibration is in any case also necessary if the flow
meter TR has to be dismantled for cleaning or if other
liquids as water are to be used.
Before calculating the new calibration factor, first a vol-
ume must be filled into an adequate precise vessel.
Optionally a reference flow meter can be used. The new
calibration factor is calculated as follows:
Factor
new
= Factor
old
x
Volume
delivered
Volume
displayed
Example:
A vessel with a volume of 2 l is filled, flow meter displays
only .90 litres.
Old calibration factor is .040.
New calibration factor is calculated as follows:
.040 x
2.00
= .090 (rounded)
.90