Electromagnetic Flowmeter M-910
56
Operation manual
13 Terminology
Special symbols and terms.
Flowrates:
Q
1%
- minimum applicable flowrate (the least flowrate which has guaranteed measuring accuracy – depends on
diameter – see table 2 M910 flowrates).
Q
5%
- recommended minimum flowrate (least flowrate which has the best measuring accuracy – depends on
diameter – see table 2 M910 flowrates).
Q
N%
- recommended nominal flowrate (nominal flowrate in which is flowmeter usually calibrated – depends on
diameter – see table 2 M910 flowrates). You can predetermine this nominal flowrate in your order.
Q
50%
- recommended maximum flowrate (maximum flowrate which is usually used in industrial applications –
depends on diameter – see table 2 M910 flowrates).
Q
100%
- maximum applicable flowrate (flowrate limit which has guaranteed measuring accuracy – depends on
diameter – see table 2 M910 flowrates).
Q
MAX
- maximum applicable overload (Q
125%
) (maximum flowrate which can be still measured – depends on
diameter – see table 2 M910 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 activates the 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. Can be cleared by pushing “RIGHT” key. 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.
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