Technical data

Flow meter FC01-Ex Flow meter FC01-Ex
Normal atmosphere - Definitions and mounting instructions 23 Normal atmosphere - Definitions and mounting instructions 23
3.3 Customer calibration
The FC01-Ex functions are mere software functions which do not affect the FC01 hardware.
Generally, a flow characteristic value is assigned to each control variable of the temperature
differential controller (with the variable equalling the heating power) by adjustments as described
within the menu.
Up to 20 trim points can be assigned to the flow characteristic curve, i.e. the calibration range. This
distribution of the trim points being determined by the user within certain ranges of the flow
characteristic curve, resolution and accuracy are determined by that distribution. By extrapolation
the measuring range is expanded beyond the max. flow value by 10% of the upper trim point.
The lower trim point can be optionally set between the zero point of the characteristic curve and
the last but one trim point. If the setting is selected above the zero point, the characteristic curve
will be extrapolated by 10% of the measuring range below the lower trim point or to the zero
point. The limit values and the analogue outputs can be set, or scaled, between these limits.
3.3.1 Options and benefits of customer calibration
Custom designed calibration allows for anomalies within medium or system variations, and the
high repeatability of the measuring procedure makes it possible to measure and indicate flow
conditions with a high degree of accuracy.
This requires that a higher-order measuring unit, or reference quantity, be available, from which
the FC01-Ex is then calibrated and set. The characteristic curve may be determined for each
individual requirement or it can be transferred from one system to another with resultant lower
accuracy.
Note:
❑ A suitable reference instrument is required in each case.
❑ Adjustment in the field: Consideration must be made as to the medium and flow
conditions available;
reference instrument required.
❑ E-T-A factory calibration: Calibration in measuring pipes (integral system)
Calibration of: water, various oils, air
3.3.2 Special flow and installation conditions
The measuring system generally implies defined flow conditions, to establish the flow characteristics
of our standard characteristic curves. This requires that certain mechanical dimensions within the
pipeline, such as distances before and after the monitoring head, before or after any bends and
changes in pipe diameter, mounting attitude of the monitoring head (e.g. immersion depth), and
any restrictions caused by turbulent or asymmetric flow be considered.
It is often difficult in compact systems to satisfy these requirements, or to judge the consequences
when they are not fully met (e.g. missing flow straighteners). The FC01-Ex allows the user to
partially or completely eliminate any serious consequences by means of its calibration features.
3.3 Customer calibration
The FC01-Ex functions are mere software functions which do not affect the FC01 hardware.
Generally, a flow characteristic value is assigned to each control variable of the temperature
differential controller (with the variable equalling the heating power) by adjustments as described
within the menu.
Up to 20 trim points can be assigned to the flow characteristic curve, i.e. the calibration range. This
distribution of the trim points being determined by the user within certain ranges of the flow
characteristic curve, resolution and accuracy are determined by that distribution. By extrapolation
the measuring range is expanded beyond the max. flow value by 10% of the upper trim point.
The lower trim point can be optionally set between the zero point of the characteristic curve and
the last but one trim point. If the setting is selected above the zero point, the characteristic curve
will be extrapolated by 10% of the measuring range below the lower trim point or to the zero
point. The limit values and the analogue outputs can be set, or scaled, between these limits.
3.3.1 Options and benefits of customer calibration
Custom designed calibration allows for anomalies within medium or system variations, and the
high repeatability of the measuring procedure makes it possible to measure and indicate flow
conditions with a high degree of accuracy.
This requires that a higher-order measuring unit, or reference quantity, be available, from which
the FC01-Ex is then calibrated and set. The characteristic curve may be determined for each
individual requirement or it can be transferred from one system to another with resultant lower
accuracy.
Note:
❑ A suitable reference instrument is required in each case.
❑ Adjustment in the field: Consideration must be made as to the medium and flow
conditions available;
reference instrument required.
❑ E-T-A factory calibration: Calibration in measuring pipes (integral system)
Calibration of: water, various oils, air
3.3.2 Special flow and installation conditions
The measuring system generally implies defined flow conditions, to establish the flow characteristics
of our standard characteristic curves. This requires that certain mechanical dimensions within the
pipeline, such as distances before and after the monitoring head, before or after any bends and
changes in pipe diameter, mounting attitude of the monitoring head (e.g. immersion depth), and
any restrictions caused by turbulent or asymmetric flow be considered.
It is often difficult in compact systems to satisfy these requirements, or to judge the consequences
when they are not fully met (e.g. missing flow straighteners). The FC01-Ex allows the user to
partially or completely eliminate any serious consequences by means of its calibration features.