NF EN 29104 : 1993
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - METHODS OF EVALUATING THE PERFORMANCE OF ELECTROMAGNETIC FLOW-METERS FOR LIQUIDS
29-09-2021
12-01-2013
Committees responsible
National foreword
Methods
Introduction
1 Scope
2 Normative references
3 Definitions
4 General testing procedure
5 Evaluation of the effect of an influence quantity
6 Tests for the evaluation of the effects of other
influence quantities
Figures
1 Sample calibration showing distribution of test
points
2 Typical circuit arrangements for upstream gate valve
tests
3 Examples showing the effects of an upstream gate
valve on three electromagnetic meters of DN 500
(based on real data)
4 Annular or segmental obstructions used to determine
the effects of a disturbance in the inlet flow on
the response of the flow-meter
5 General test circuit
6 Test of the effect of a) mains frequency common-mode
voltage (voltage applied between the earth of the
primary and secondary devices) and b) mains
frequency voltage between neutral and primary earth
(voltage applied between earth and mains, if
practicable)
7 Test of the effect of mains frequency voltage
between earth and output terminals
8 Test of the effect of a.c. currents on earthed
connection between primary and secondary devices
9 Test of the effect of series-mode signals at the
supply frequency
10 Test of the effect of stray currents within the
liquid
Annex
A Bibliography
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