Seikom Electronic NLSW 45-3 SIL1 User manual

Operating
instructions
NLSW®45-3 SIL1
24 V AC/DC, 230 V AC

Version 1

[phone] - [email protected] - www.seikom-electronic.com
page 2

[phone] - [email protected] - www.seikom-electronic.com
Page 3
Operating
instructions
NLSW®45-3 SIL1
Contents
Contents ..........................................................................................................................................3
1. SAFETY INSTRUCTIONS ..........................................................................................................4
2. GENERAL INFORMATION ..........................................................................................................4
2.1 Proper use.................................................................................................................................................4
2.2 Functional principle....................................................................................................................................4
3. TECHNICAL DATA......................................................................................................................5
4. INSTALLATION AND COMMISSIONING .........................................................................................6
4.1 Installation conditions.................................................................................................................................6
4.2 Electrical connections ............................................................................................................................. 6
4.3 Setting the switching point ...................................................................................................................... 7
4.4 Instructions for commissioning..................................................................................................................7
5. MAINTENANCE INSTRUCTIONS ..............................................................................................8
6. TROUBLESHOOTING................................................................................................................8
7. EU DECLARATION OF CONFORMITY ......................................................................................9

Operating
instructions
NLSW®45-3 SIL1
1. SAFETY INSTRUCTIONS
[phone] - [email protected] - www.seikom-electronic.com
Page 4
Read the product description before using the device. M a k e s u r e that the product is fully
suitable for your application.
Incorrect or improper use can lead to malfunctions of the device or to undesirable effects on your
application.
For this reason, installation, electrical connection, commissioning, operation and maintenance of the
appliance may only be carried out by trained personnel.
2. GENERAL INFORMATION
The calorimetric flow monitors in the NLSW®45-3 SIL1 series are an economical alternative to
conventional pressure transmitters. Typical applications include the monitoring of engine cooling
systems, paint shops or the flow monitoring of test stands. Installation is quick and easy via a flange
mounting (for duct installation) or via a threaded connection. The switching point can be freely
selected via the integrated potentiometer. The switching output is activated when there is a flow
(yellow LED on the device lights up).
2.1 Proper use
The flow monitors of the NLSW®45-3 SIL1 series are designed for monitoring gaseous media within
the specified technical data. The main areas of application are heating, ventilation and air
conditioning in the field of building automation as well as system monitoring, especially for safety-
critical areas.
2.2 Functional principle
Flow monitors of the NLSW®45-3 SIL1 series operate according to the calorimetric principle. The relay
of a device switches when the flow velocity reaches a preselected threshold value. The calorimetric
measuring principle is based on a heated, temperature-sensitive resistor. Heat is extracted from the
precision resistor by the flow in the medium, the temperature of the resistor changes and thus its
resistance value. This change is evaluated by the device. However, since not only the flow velocity of
the medium has an influence on the amount of heat dissipated, but also its temperature, a
correlation between flow and temperature must be established. This is achieved by a second,
temperature-dependent precision resistor in addition to the first. The second precision resistor
(temperature compensation) is not heated and is only used to measure the temperature.
Flow rate ≥threshold value
Relay output activated
Yellow "Air flow" LED lights up
Flow rate < threshold value
Relay output not activated
Yellow "Airflow" LED goes out

Operating
instructions
NLSW®45-3 SIL1
[phone] - [email protected] - www.seikom-electronic.com
page 5
3. TECHNICAL DATA
Type
NLSW®45-3 SIL1
Operating voltage
24 V AC/DC
230 V AC 50/60 Hz
Article no.
77029SIL1
63377SIL1
Voltage tolerance
± 5%
± 6%
Overvoltage category
II
Signal display voltage
Green LED
Power consumption max.
3 VA
4.5 VA
Ambient temperature Device
-20 ... 50°C
Signal output flow
Relay, 1 changeover contact
Switching function with flow
Relay picks up
Relay output
250 V AC, 8 A, 2 kVA
Minimum switching capacity
10 mA, 5 V DC
Signal display with flow
Yellow LED
Start-up delay
5 ... 60 s (jumper can be activated)
Start-up delay display
Yellow LED
Media temperature range
-25 ... 120°C
Switching point adjustment
Adjustable via potentiometer
Air flow range
0.1 ... 30.0 m/s
Measuring sensor
F3 SIL1 (available separately)
Immersion depth approx.
50 mm, 130 mm, 165 mm, 300 mm, 400 mm, 500 mm
Electrical connection
10 terminals, 2.5 mm²
Enclosure protection class
IP40
Protection class Terminals
IP20
Housing dimensions (L x
W x H)
120 mm x 45 mm x 73 mm
SIL certification
SIL1
Test mark
Type tested TÜV Nord according to
DIN EN 61010-1:2011-07

Operating
instructions
NLSW®45-3 SIL1
4. INSTALLATION AND COMMISSIONING
[phone] - [email protected] - www.seikom-electronic.com
Page 6
Installation and commissioning must be carried out by authorized and qualified
personnel.
The connection to the main supply (L, N) must be made via a protected circuit breaker with standard
fuses. The general VDE regulations must always be observed (VDE 0100, VDE 0113, VDE 0160). If
the potential-free contact is connected to a safety extra-low voltage, the connecting cables must
be sufficiently insulated up to the terminal, as otherwise the double insulation to the mains
voltage side may be impaired. The current carrying capacity of the potential-free contact is
limited to 8 A. Therefore, the circuit of the potential-free contact must be protected with a 10.3
A fuse.
4.1 Installation conditions
To avoid malfunctions, please observe the following points:
▪ The tip of the sensor should be as close as possible to the center of the pipe. The
through-hole in the shaft of the sensor must be completely inside the duct.
▪ There is a small notch in the metal at the end of the sensor. This marking is intended as a
mounting aid and should be placed in the direction from which the current is coming.
▪ With vertical ducts, the direction of flow should be upwards, especially for small air flows
(up to 1 m/s), in order to avoid influences from thermally rising air.
▪ For optimum measurement, the sensor requires at least 5 x D (internal pipe diameter) of
the free inlet and 3 x D of the outlet in order to avoid incorrect measurements due to
turbulence.
▪ The built-in device to IP20 (corresponds to VBG4) must be installed in an enclosure or
in a switch cabinet.
▪ The NLSW®45-3 SIL1 evaluation unit is intended for mounting on a profile rail (DIN EN
50022-35). If the device is exposed to major vibrations, it is advisable to mount it on
vibrating metal.
4.2 Electrical connections
BN: Brown
BK: Black
GY: Gray
NLSW®45-3
SIL1

Operating
instructions
NLSW®45-3 SIL1
[phone] - [email protected] - www.seikom-electronic.com
Page 7
4.3 Setting the switching point
The relationship between air velocity and change in resistance is not linear. In the lower range (small
flows), the change in resistance is very large. In the upper range, the change in resistance is always
smaller for the same flow changes. When setting the switching point, it should therefore be noted
which change is to be monitored, as different settings have certain disadvantages. The following
requirements should be observed:
Small flow change in the high flow velocity range: The switching point must be selected very
close to the measured value of the normal flow, as the measured value change is very small when the
flow changes. As the temperature compensation has a certain delay compared to the actual
temperature change, such a switching point setting is only possible for applications with slow
temperature changes.
Small flow change in the low flow velocity range: The switching point can be selected with a
greater distance to the measured value of the normal flow, as the measured value change is large
when the flow changes. A change in temperature has no effect on the switching behavior.
Large flow change: A 'yes/no statement' is usually required here (e.g. fan running or fan stopped).
Therefore, such a large safety distance can be selected that neither temperature changes nor
turbulence have an influence on the switching behavior.
The switching points are set on the evaluation unit of the airflow monitor.
4.4 Instructions for commissioning
The following procedure is recommended for commissioning and setting the device:
▪ Connect a suitable sensor to the device and install the flow controller and sensor in
accordance with the installation instructions.
▪ Align the mark on the end of the sensor with the air flow.
▪ If necessary. Set jumper for start-up bypass
▪ Set the "Sensitivity" potentiometer to minimum sensitivity (left stop).
▪ Connect the mains voltage. The green LED lights up. If the jumper is set, the start-up bypass
runs (approx. 60 seconds).
▪ Set the nominal flow rate.
▪ Slowly turn the "Sensitivity" potentiometer clockwise until the yellow LED lights up and
the signal output switches. Turn the potentiometer slightly beyond the switching point to avoid
incorrect switching when the flow rate changes slightly.
▪ To check the function of the flow regulator, reduce or stop the flow.
▪ The yellow LED goes out (output relay on the appliance has
dropped out) The appliance is now ready for operation.

Operating
instructions
NLSW®45-3 SIL1
[phone] - [email protected] - www.seikom-electronic.com
page 8
5. MAINTENANCE INSTRUCTIONS
The air flow sensor should be serviced at regular intervals, i.e. the air flow sensor should be cleaned
when used in heavily contaminated media. The following procedure is recommended:
▪ Dismantling the air flow sensor
▪ Carefully immerse the airflow sensor in lukewarm soapy water for approx. 10 minutes
(depending on the degree of soiling)
▪ Carefully rinse the air flow sensor with lukewarm water
▪ Fitting the air flow sensor
▪ Commission the airflow monitor and, if necessary, carry out a new adjustment with the
evaluation electronics)
Please do not clean the sensor tip with a screwdriver, wire brush or similar. There is a
risk of damage.
6. TROUBLESHOOTING
The following instructions are intended as first aid if your airflow monitor is not working properly.
Problem
Possible cause
Solution
The device does not work.
Missing or incorrect
Power supply.
Supply voltage and
Check the connection.
The device does not detect air
flow.
The sensor is not installed
correctly.
Flow rate is outside the
measuring range
Check that the sensor has
been installed so that its mark
is in the direction of the
airflow source and close to
the center of the duct.
Adjust the diameter of the
pipe to increase the flow rate
or reduce them.
The device detects an air flow,
even if there is no air flow.
Air flow is also present when
the unit is at a standstill, e.g.
through ventilation flaps,
through
Air flowing in from outside.
Set the switching point of
the sensor.
The device reacts with a delay.
The sensor tip is
soiled.
Clean the sensor
carefully with water.
Device switches when the
media temperature rises
rapidly.
The temperature gradient is
outside the technical
specifications.
Turn the "Sensitivity"
potentiometer slightly further
clockwise.
Switching point in hot
Set media environment.

Operating
instructions
NLSW®45-3 SIL1
[phone] - [email protected] - www.seikom-electronic.com
Page 9
7. EU DECLARATION OF CONFORMITY

Operating
instructions
NLSW®45-3 SIL1
[phone] - [email protected] - www.seikom-electronic.com
page 10

[phone]
[email protected]
www.seikom-electronic.com
SEIKOM-Electronic GmbH & Co KG
Gold-Zack-Straße 7
40822 Mettmann
Growing network of local distributors available online
www.seikom-electronic.com
Our product portfolio
Flow rate
Temperature
Print
Air quality and CO2
Zener barriers
Universal Transmitter