ELIS PLZEŇ a. s.
Project design, installation and service manual
Page 47 of 72
Electromagnetic flowmeter FLONET FH30xx
ELIS PLZE
Ň a. s., Luční 425/15, 301 00 Plzeň, Czech Republic, phone.: +420 377 517 711, fax: +420 377 517 722
Es 90678K
9
CALIBRATION
9.1 General
The flowmeter is supplied verified as to its functions, calibrated and with parameters set according to
the customer’s requirements.
The measurement accuracy of the flowmeter in its standard form and configuration is guaranteed to
meet the provisions of the international standard EN ISO 4064-1
: Water meters for cold drinking
water and hot water
.
Unless agreed otherwise with the customer, the flowmeters are calibrated using the frequency output 0
– 10kHz.
Upon special requirement and agreement with the flowmeter manufacturer, the meter calibration may
be carried out using alternative, i.e. pulse or current outputs.
The guaranteed measurement accuracy parameters shall always be related to the type of output which
was used for the meter calibration. The remaining two types of output are recommended to be used for
measurements with accuracy lower by 1 to 2% compared to that associated with the calibrated output.
For inspection or comparison measurements at the customer’s premises, or metrological verification of
the meter parameters, the same type of electric output as that used for the initial calibration at the
manufacturing plant shall be selected. Such measurements shall be performed under specified
reference conditions.
At such measurements it is important to connect the hydraulic meter section (the sensor) into
the hydraulic circuit on the test stand using connection elements (flanges, threaded fittings,
fittings used in food-processing lines or others) of the same type, size and design as found on
the meter sensor, to prevent occurrence of hydraulic disturbances that might significantly affect
the meter measurement accuracy.
9.2 Reference conditions
Measured fluid: water, temperature 22
C ± 4
Ambient temperature: 22
C ±
Electrical conductivity of the measured fluid > 300μS
Straight piping sections ≥ 10 before and 5 after the flowmeter
Minimum medium pressure at the meter output: 1 bar
Time for the meter temperature stabilisation: > 30min
The sensor to be centred, grounded and supplied with power as required by the product manual
The meter shall be set for zero flow rate
9.3 Measurement accuracy
9.3.1 Flowmeter FLONET FH30xx
– standard measurement accuracy
The meter accuracy shall meet the requirements of standard
EN ISO 4064-1
(Water meters for cold
drinking water and hot water).
Definitions according to EN ISO 4064-1:
Q
4
= 1.25
Q
2
= 1.6
Q
3
Q
1
Q
4
flow rate for fluid flow velocity at the meter sensor of 10 m/s.
Q
1
flow rate for fluid flow velocity at the meter sensor of 0.025 m/s
