Festo — SFAB-...-PNLK — 2022-08
Product overview
9
Example for LCD display
Meaning
Main display
Lower display
Menu for extreme values and mean values (SHOW menu)
‘5.1’
‘MIN’/‘l/Min’
Minimum measured flow rate since switch-on or the last
reset
‘30.8’
‘MAX’/‘l/Min’
Maximum measured flow rate since switch-on or the last
reset
‘20.8’
‘AVER’/‘l/Min’
Average of the flow rate measurement, filter time constants
switchable
Menu for device settings (SPEC menu)
‘64’
‘Filt’ / ‘MSEC’
Value of the filter time constant for the flow rate measure-
ment signal
‘l/min’
‘FLOW’ / ‘Unit’
Display unit for flow rate measurement
‘0°C’
‘REF’ / ‘Cond’
Reference standard for gas volume
‘Air’
‘GAS’
Selection of the operating medium
‘OFF’
‘Z.Adj’
Activation of the zero point synchronisation
‘°C’
‘tEMP’/‘Unit’
Display unit for temperature measurement
‘Unit’
‘Sub.d’
Settings of sub-display in RUN mode
‘10’
‘Eco’ / ‘SEC’
Economy mode: period of time after which the display
background lighting is switched off.
‘PNP’
‘bin’/‘Out’
Switchover of the switching outputs between PNP and NPN
‘FLOW’
‘bin’/‘Pin4’
Switchover of the switching signal at pin 4 between flow
monitoring and volume pulse
‘FLOW’
‘bin’/‘Pin2’
Switchover of the signal at Pin2 between flow monitoring,
flow measurement and temperature recording
‘OFF’
‘Lock’/‘Code’
Activation and specification of the security code
‘OFF’
‘MASt’
Activation of the IO-Link master function for replication of
parameters
Tab. 2: Example for LCD display
4.2
Function
4.2.1
Functional principle
The sensor measures the standard flow rate or mass flow rate with the help of a thermal procedure.
The sensor measures the amount of heat that is drawn from the heated surface of a micro-mechanical
sensor element by the medium flowing past. The sensor determines the flow rate or the accumulated
volume from the amount of heat removed and shows this on the display. The sensor calculates
the temperature of the medium from the sensor signals. The sensor is connected to higher-level
