BASI
Electromagnetic flowmeter
BF
M921
Operation manual
21
Qp 1 pulse
Item allows setting the Qp constant. Qp represents the volume for one
impulse.
Status
output
Mode
Output mode can be selected from Off, On positive, On negative, On In,
On out, Dose on, Dose off, On<F1, O
n
>F1, Error on, Error off.
Error mask
The Mask allows selecting which errors will be reported via the Status
Output. Mask value is calculated as sum of bit values all enabled errors.
See
Digital input Mode
Input mode can be selected from Off, Start dose, Clear aux. volume,
Clear all volumes, State out on, State out off, State out toggle, Empty
pipe.
Limits
Limit PF1
Low flowrate limit.
Limit PF2
High flowrate limit.
Hysteresis
Hysteresis of flowrate limits.
Dosing
Volume
Function enables user to set volume for dosing.
Actual
Function displays actual state of measured dose.
Stop dosing
Function enables user to stop dosing in progress.
Table 6 : Input/output interface setup
4.2.4
Calibration
4.2.4.1
Basic calibration
Following table lists basic calibration. This menu recalculates all internal calibration points.
User can change calibration values only
if the correct calibration password has been entered. Default factory
set Calibration password is “10000”.
Setup menu/Calibration
Level 1
Description
Set zero flow
Recalibrates flowmeters zero point. Before starting recalibration measuring tube
must be completely filled and flowrate must be ‘0’.
Relative difference Recalibrates flowmeters slope (relative). Slope can be selected from -15 % to +15 %.
Actual flow
Actual measured flow (actual average - Setup menu/Flow/Moving average)
30s average flow
Actual measured flow (30s average)
Table 7 : User calibration
4.2.4.2
Extended calibration
Flowmeter
BF
M921 enables calibration at 2, 3 or 4 points. Each calibration point contains 2 values.
Nominal value of calibration point is selected by user in range b/- QMAX (for maximum
flowrates see table 1:
BF
M921 flowrates). It is expressed in flowrate units. To this nominal value is
attached a calibration constant. Calibration constant doesn’t have a unit. In the calibration process user
change this calibration constant to reach similarity between standard flowmeter and the calibrated
flowmeter. Higher calibration constant means lower displayed value.
Calibration constants must be different. In the case of two equal calibration constants, the measured values
could be wrong.
User can restore calibration settings to factory values
(Setup menu/General/
Factory settings/
Restore calibration points).
