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Setting the switching point
The relationship between air velocity and impedance change is non linear. In the lower range of flow velocity, the
change of impedance is very large. In the upper range of flow velocity, identical changes in flow velocity result in
increasingly smaller impedance changes. If the switching point is set, it is important to note what change is to be
monitored because different settings have certain disadvantages.
Note the following requirements:
Small flow change in high flow velocity range:
normal flow reading since flow changes only lead to a very small change in the measured value. Since temperature
compensation takes place with certain delay after the actual temperature change has occurred, this switching point
setting is only suitable for the applications which have slow temperature changes in the medium.
Small flow change in low flow velocity range:
from the normal flow reading because a change in flow velocity causes a very large change in the measured value.
A temperature change has no effect on switching behaviour.
Large change in flow rate:
A Yes/NO statement is usually required here (e.g. fan running or fan stationary). You can therefore select a safety
clearance which is so large that neither temperature changes nor turbulence may have an affect on switching
behaviour.
Commissioning the NLSW2aS3:
The commissioning needs to be done by appropriate personnel!
1.
Connect a fitting sensor (F2, F2Sond.1, F3, F4.2) and power supply regarding to the connection
diagram
Set potentiometer "Sensitivity" to minimum sensitivity
2.
3.
turn on supply voltage; the green LED enlightens; the device is ready within 2s
4.
the yellow blinks (with Z-option, the yellow LED remains enlightened while the start-up delay runs down;
approx. 30s)
5.
switch on the flow generator
slowly turn the potentiometer "Sensitivity" to maximum until the yellow LED enlightens and the relays
6.
connects. To achieve stable switch behaviour turn the potentiometer a bit more. With Z-option you need
wait to the start-up delay being run down to set the switch point!
7.
To check for correct installation, switch off the flow. The yellow LED must darken and the relays break.
Attention: The NLSW2aS3 watches flows above 10m/s!
What to do if the monitoring device does not work properly
Problem
device does not work in any way
no or wrong suplly voltage
device does not recognice flow
sensor is not installed properly
flow is out of range
device reacts in a different way
sensor is highly polluted
device reacts in fast media tepmerature
temperature gradient is out
changes
Mistakes and misprints are not to be excluded. All information „without guarantee".
SEIKOM-Electronic GmbH & Co. KGFortunastr.20D-42489 Wülfrath
Telefon: +49(0) 20 58/20 44 Fax: +49(0) 20 58 / 79 111
E-Mail:
Internet: http://www.seikom-electronic.de
info@seikom-electronic.com
The switching point must be selected very close to the
The switching point can be selected at a greater interval
cause
sollution
check supply voltage and connection
check the sensor's installation
change the tube's diameter
maintain the sensor
check the temp. Gradient of your
of range
installation
08/2018
Air-flow monitoring
Manual for air-flow monitor
NLSW2aS3
Our products correspond to the requirements of the European guidelines
WEEE 2012/19/EU - RoHS 2011/65/EU
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