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BASI
7.7 Terminology
Special symbols and terms.
Flowrates:
- minimum applicable flowrate (the least flowrate which has guaranteed measuring accuracy –
Q
1%
depends on diameter – see table 2 BFM921 flowrates).
- recommended minimum flowrate (least flowrate which has the best measuring accuracy –
Q
5%
depends on diameter – see table 2 BFM921 flowrates).
Q
- recommended nominal flowrate (nominal flowrate in which is flowmeter usually calibrated
N
–depends on diameter – see table 2 BFM921 flowrates). User can predetermine this nominal
flowrate in userr order.
Q
- recommended maximum flowrate (maximum flowrate which is usually used in industrial
50%
applications – depends on diameter – see table 2 BFM921 flowrates).
- maximum applicable flowrate (flowrate limit which has guaranteed measuring accuracy – depends
Q
100%
on diameter – see table 2 BFM921 flowrates).
Q
- maximum applicable overload (Q
MAX
on diameter – see table 2 BFM921 flowrates).
Abbreviations:
Qi
- current output constant. It represents flowrate for current 20 mA.
Qf
- frequency output constant. It represents flowrate for frequency 1000 Hz.
Qp
- impulse output constant. It represents volume for 1 impulse.
Qd
- constant for dosing. It represents volume for 1 dose.
PF1
- flowrate limit constant. It represents low limit flowrate. Crossing this limit
appropriate digital output.
PF2
- flowrate limit constant. It represents high limit flowrate. Crossing this limit activates the
appropriate digital output.
H
- flowrate limit constant. It represents hysteresis by evaluating limits PF1 and PF2.
Auxiliary volume counter – second Total Volume counter. It is usually used for measuring volume during
day, month etc.
RS232 – serial bus. It enables remote control of instruments by a computer. Only one instrument can be
connected to one RS232 bus. Cable length between PC and instrument is limited to app. 10 metres.
RS485 – serial bus. It enables remote control of instruments by a computer. To the RS485 can be connected
more instruments (max. 16). Total cable length is limited to app. 800 metres.
Operation manual
) (maximum flowrate which can be still measured – depends
125%
Electromagnetic flowmeter BFM921
activates the
67
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