Seikom Electronic RLSW4 User manual

UserManual
RLSW®4 (R)
24 V AC/DC
Version 1

Page: 2
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User Manual
RLSW®4 (R)
[phone] •[e-mail] •www.seikom-electronic.com
Page: 3
CONTENTS
CONTENTS............................................................................................................................. 3
1. SAFETY INSTRUCTIONS .................................................................................................... 4
2. GENERAL INFORMATION .................................................................................................. 4
2.1 Proper Use.............................................................................................................................. 4
2.2 Function Principle ................................................................................................................... 4
3. TECHNICAL DATA............................................................................................................. 5
3.1 Dimensions............................................................................................................................. 6
4. INSTALLATION AND COMMISSIONING .............................................................................. 6
4.1 Installation Conditions ............................................................................................................ 7
4.2 Electrical Connections ............................................................................................................ 7
4.3 Setting the Switching Point ...................................................................................................... 7
4.4 Commissioning instructions .................................................................................................... 8
5. MAINTENANCE INSTRUCTIONS......................................................................................... 8
5. ERROR MESSAGES ........................................................................................................... 8
6. EU DECLARATION OF CONFORMITY................................................................................ 10

User Manual
RLSW®4 (R)
Page: 4
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1. SAFETY INSTRUCTIONS
Read the product description before commissioning the device. Make sure that the product
is suitable for your application without any restrictions.
Improper use or use not in accordance with the intended use can lead to malfunctions of the device
or to undesirable effects your application.
For this reason, the installation, electrical connection, startup, operation and maintenance of the
device may only be carried out by trained personnel.
2. GENERAL INFORMATION
The calorimetric flow monitors of the RLSW®4 series are an economical alternative to common
pressure transmitters. The installation is simple and quick by means of a flange mount (for channel
installation) or by means of a PG7 threaded connector. The switching point can be selected via the
integrated potentiometer. In case a flow is present, the switching output is conductive (yellow LED on
the unit is on).
2.1 Proper Use
Flow controllers of the RLSW®4 series are intended to be used to monitor flow of gaseous media within
the specified technical data. Main areas of application are heating, ventilating and air conditioning in
the field of automated building systems.
2.2 Function Principle
Flow monitors of the RLSW®4 series function according to the calorimetric principle. A unit’s relay
switches when flow speed reaches a pre-selected threshold value. The calorimetric measuring
principle is based on a heated temperature-sensitive resistor. Flow in the medium dissipates heat
from the precision resistor, the temperature of the resistor changes and thus its resistance value. This
change is evaluated by the unit. However, not only the flow speed of the medium has an influence on
the dissipated amount of heat, but also its temperature, therefore a relation between flow and
temperature must be established. This is achieved by a second, temperature-dependent precision
resistor next to the first one. The second precision resistor (temperature compensation) is not heated
and serves to measure the temperature only.
Flow ≥threshold value
Relay output energized
Yellow LED “Airflow” turns on
Flow < threshold value
Relay output not energized
Yellow LED “Airflow” shuts off

User Manual
RLSW®4 (R)
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Page: 5
3. TECHNICAL DATA
Type
RLSW®4R
Article-No.
74825R
Operating voltage
24 V AC/DC
Voltage tolerance
± 5%
Signal lamp voltage
-
Power consumption
1 VA
Ambient temperature
-20 …60°C
Switching output
1 NO-contact
Switching function at flow
Relay engages
Relay output
250 V AC, 5 A, 1.2 kVA
Minimum switching load
10 mA, 5 V DC
Signal lamp airflow
Yellow LED
Media temperature range
-10 … 80°C
Temperature gradient
15 K/min
Switching point adjustment
With potentiometer
Airflow range
0.1 … 15.0 m/s
Sensor
Integrated
Immersion depth
50 mm, 140 mm
Process connection
PG7, mounting flange
Sensor material
MS58, nickel-plated, optional stainless steel
Pressure resistance
10 bar
Electrical connection
4 terminals, 2.5 mm² (optional: M8 plug connector)
Protection category, housing
IP65
Protection category, terminals
IP67
Housing dimensions
(L x W x H)
30 mm x 50 mm x 65 mm
Type certification
Type examination TÜV Nord according to
DIN EN 61010-1:2011-07

User Manual
RLSW®4 (R)
Page: 6
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3.1 Dimensions
4. INSTALLATION AND COMMISSIONING
Installation and commissioning must be performed by authorized and qualified
personnel.
Connections to main supply (L, N) must be made by means of a protected isolating switch with usual
fuses. As a matter of principle, the General VDE regulations must be complied with (VDE 0100, VDE
0113, VDE 0160). If the potential-free contact is connected to an extra-low safety voltage, sufficient
insulation must be provided for the connecting cables up to the terminal, since otherwise the double
insulation to the mains voltage side may be impaired. The current load capacity of the potential-free
contact is limited to 6 A. Therefore, the electrical circuit of the potential-free contact must be
protected by a 6.3 A fuse.
65mm
25mm
60mm
35mm
10mm
10mm
M16x1,5
50mm
35mm
PG7
Flange
47mm
14,2mm (10mm)
15mm
37.0 mm
Locking screw
4.0mm

User Manual
RLSW®4 (R)
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Page: 7
4.1 Installation Conditions
To avoid malfunctions, please refer to the following points:
▪The tip of the sensor should be as close as possible to the centre of the pipe. The traverse
hole in the shaft of the sensor must be within the full of the gaseous medium.
▪The marking is intended as an assembly aid and should be placed in the direction from which
the flow originates.
▪In case of vertical pipes, the direction of flow should be upwards.
▪The sensor needs at least 5xD (inside pipe diameter) of free inlet and 3xD (inside pipe
diameter) of outlet path to avoid false measurement due to turbulence.
4.2 Electrical Connections
4.3 Setting the Switching Point
The interrelation between air speed and resistance change of the precision resistors is not linear. In
the lower range (low rates of flow) the relative change of resistance is large. In the upper range, the
change of resistance at identical deviations in flow speed becomes increasingly smaller. When setting
the switching point, it must first be determined what change is to be monitored, since some settings
result in certain disadvantages. The following requirements must be taken into consideration:
Low change in the rate of flow in the high flow speed range: the switching point must be chosen
very close to the measuring value of the normal flow, since the change of measuring values is very
small when the rate of flow changes. Since the temperature compensation exhibits a certain amount
of delay in comparison to the actual change of temperature, such a setting of the switching point is
possible only with slow changes of temperature.
Low change in the rate of flow in the low flow speed range: the switching point may be selected at
a greater distance from the measuring value of the normal rate of flow, since the changes of the
measuring values are larger when the rate of flow changes. A change in temperature has no effect on
the switching behaviour.
Large change in the rate of flow: in most cases like this a simple yes/no statement is desired (e.g.
ventilator running or ventilator stopped). Therefore, a larger safety margin may be selected, so that
neither temperature changes nor turbulence have any influence on the switching behaviour.
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User Manual
RLSW®4 (R)
Page: 8
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4.4 Commissioning Instructions
When commissioning and adjusting the device, the following procedure is recommended:
▪Install and connect the flow controller in accordance with installation instructions and
conditions, inlet (5 x pipe diameter) + outflow zone (3 x pipe diameter). Align the mark to the
airflow.
▪Set jumper for start up bypass, if required.
▪Set trimmer “Sensitivity” to minimum sensitivity (left limit stop).
▪Connect main voltage. The yellow LED lights up.
▪Set nominal rate of flow.
▪Slowly turn trimmer “Sensitivity” clockwise until the yellow LED lights up and the signal
output switches. In order to avoid erroneous switching at low changes of flow, turn the
potentiometer slightly past the switching point.
▪To check the function of the flow controller, reduce or stop the flow.
▪The yellow LED will go off (output relay at RLSW®4 is released).
The device is now set to function.
5. MAINTENANCE INSTRUCTIONS
The airflow sensor should be serviced at regular intervals, i.e., the airflow sensor should be cleaned
when used in heavily contaminated media. The following procedure is expedient:
▪Dismantle air flow monitor
▪Carefully soak the airflow monitor in lukewarm soapy water for approx. 10 minutes
(depending on the degree of soiling).
▪Carefully rinse the airflow monitor with lukewarm water.
▪Install the airflow monitor
▪Put the airflow monitor into operation and, if necessary, carry out a new calibration with the
evaluation electronics.
Do not clean the sensor tip with a screwdriver, wire brush or similar. There is a high
risk of damage.
6. ERROR MESSAGES
The following instructions are intended as first level support in case your airflow monitor is not working
properly.
Problem
Potential Cause
Solution
Device does not work at all
Missing or wrong supply
voltage
Check supply voltage and
connection
Device does not detect an air
flow
Sensor is not installed
properly
Review if the sensor was
installed with its marking
positioned towards the airflow
source and close to the duct’s
center

User Manual
RLSW®4 (R)
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Page: 9
Flow is outside of the
measurement range
Adjust the tube’s diameter to
increase or decrease the flow
Device detects air flow when
no air flow is present
Air flow is present even at
standstill e.g., due to
ventilation flaps through
which air enters from the
outside
Adjust the sensor’s switching
point
Device shows delayed
reaction behavior
Sensor tip is polluted
Carefully clean the sensor
with water
Device switches in the event
of a rapid media temperature
increase
Temperature gradient is
outside of technical
specifications
Turn the "Sensitivity"
potentiometer a little further
clockwise
Set switching point in hot
media environment

User Manual
RLSW®4 (R)
Page: 10
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7. EU DECLARATION OF CONFORMITY

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