Seikom Electronic RLSW 7 User manual

UserManual
RLSW®7
24 V AC/DC, 230 V AC
Version 1

Page: 2
[phone] •[e-mail] •www.seikom-electronic.com

User Manual
RLSW®7
Page: 3
[phone] •[e-mail] •www.seikom-electronic.com
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 (Housing depth approx. 80mm) Immersion depth alternatively available in 150mm. 6
4. INSTALLATION AND COMMISSIONING .............................................................................. 6
4.1 Installation Conditions ............................................................................................................ 6
4.2 Electrical Connections ............................................................................................................ 7
4.3 Setting the Switching Point ...................................................................................................... 7
4.4 Commissioning Instructions.................................................................................................... 8
5. MAINTENANCE INSTRUCTIONS......................................................................................... 8
6. ERROR MESSAGES ........................................................................................................... 9
7. EU DECLARATION OF CONFORMITY................................................................................ 10

User Manual
RLSW®7
Page: 4
[phone] •[e-mail] •www.seikom-electronic.com
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 on your application. For this reason, the installation, electrical connection,
startup, operation and maintenance of the device may only be carried out by trained personnel.
The glycol content in cooling circuits must not exceed 30%. Above 30% glycol content, malfunctions
and functional failure are possible.
2. GENERAL INFORMATION
The calorimetric flow monitors of the RLSW®7 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 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
The flow monitors of the RLSW®7 series operate on a thermodynamic basis without moving parts.
Areas of application are the monitoring of chillers (water shortage), boiler and sprinkler systems,
pumps, cooling and lubricant circuits. They serve as a replacement for mechanical paddle monitors
and wind vane relays.
2.2 Function Principle
Flow monitors of the RLSW®7 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 turns on
Flow < threshold value
Relay output not energized
Yellow LED shuts off

User Manual
RLSW®7
Page: 5
[phone] •[e-mail] •www.seikom-electronic.com
3. TECHNICAL DATA
Type
RLSW®7 G1/2-inch
RLSW®7 G1/4-inch
Process connection
G1/2-inch
G1/4-inch
Operating voltage
24 V AC/DC
230 V AC
24 V AC/DC
230 V AC
Article-No.
74398
74399
74396
74397
Insertion depth
46 mm
150 mm
46 mm
150 mm
48 mm
150 mm
48 mm
150 mm
Voltage tolerance
± 5%
± 6%
± 5%
± 6%
Overvoltage category
II
Signal lamp voltage
Green LED
Power consumption
3 VA
4,5 VA
3 VA
4,5 VA
Ambient
temperature
-20 … 60°C
Switching output
Relay, 1 change-over contact
Switching function at
flow
Relay engages
Relay output
250 V AC, 6 A, 1.5 kVA
Minimum switching
load
10 mA, 5 V DC
Signal lamp airflow
Yellow LED
Media temperature
range air
-25 … 80°C
Media temperature
range water
-10 … 80°C
Temperature
gradient
15 K/min
Switching point
adjustment
With potentiometer
Airflow range
0.5 … 20.0 m/s
Water measuring
range
0.03 … 10s/ max. 90 s
Sensor
Integrated
Sensor material
Stainless steel V4A
Pressure resistance
20 bar
Electrical
connection
5 terminals, 2.5 mm²
Protection category,
housing
IP65
Protection category,
terminals
IP67
Pollution class
2
Housing dimensions
(L x W x H)
56 mm x 84 mm x 82 mm
Type certification
Type examination TÜV Nord according to DIN EN 61010-1:2011-07

User Manual
RLSW®7
Page: 6
[phone] •[e-mail] •www.seikom-electronic.com
3.1 Dimensions (Housing depth approx. 80mm) Immersion depth alternatively available in
150mm.
Drawings not to scale.
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.
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 center of the pipe.
▪If there are deposits or air pockets in horizontal pipes, install the RLSW®7 sideways. Select a
low-turbulence installation location.
▪To avoid pitting, do not use the stainless steel sensor in solutions containing chlorine or in
fittings/pipes made of copper, brass or gunmetal.
▪Do not install the sensor directly behind valves, flaps, branches and bends.

User Manual
RLSW®7
Page: 7
[phone] •[e-mail] •www.seikom-electronic.com
▪If you measure air flows with the unit, the following applies:
-In case of vertical pipes, 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.
-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 unit has two potentiometers for setting the switching points, the upper one is for fine adjustment,
the lower one is for coarse adjustment.
The interrelation between flow 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 is 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.
The switching points are set on the evaluation unit of the Flow monitor.
L(+) N(-)
16 15 18
RLSW7

User Manual
RLSW®7
Page: 8
[phone] •[e-mail] •www.seikom-electronic.com
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.
▪Align the mark on the sensor end with the flow.
▪If necessary. Set jumper for start-up bypass
▪Set trimmer “Sensitivity” to minimum sensitivity (left limit stop).
▪Connect main voltage. The green LED lights up. If the jumper has been set, the start-up
bypass procedure will be executed (approx. 60 sec.).
▪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®7 is released).
▪Check glycol content (below 30%)
The device is now set to function.
5. MAINTENANCE INSTRUCTIONS
The flow sensor should be serviced at regular intervals, i.e., the flow sensor should be cleaned when
used in heavily contaminated media. The following procedure is expedient:
▪Dismantle flow monitor.
▪Carefully soak the flow monitor in lukewarm soapy water for approx. 10 minutes (depending
on the degree of soiling).
▪Carefully rinse the flow monitor with lukewarm water.
▪Install the flow monitor.
▪Put the flow 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.

User Manual
RLSW®7
Page: 9
[phone] •[e-mail] •www.seikom-electronic.com
6. ERROR MESSAGES
The following instructions are intended as first level support in case your flow 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
flow
Sensor is not installed
properly
Flow is outside of the
measurement range
Review if the sensor was
installed with its marking
positioned towards the airflow
source and close to the duct’s
center
Adjust the tube’s diameter to
increase or decrease the flow
Device detects flow when no
flow is present
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®7
Page: 10
[phone] •[e-mail] •www.seikom-electronic.com
7. EU DECLARATION OF CONFORMITY

User Manual
RLSW®7
Page: 11
[phone] •[e-mail] •www.seikom-electronic.com

Growing network of local distributors available online
www.seikom-electronic.com
Our Product Portfolio
Flow
Temperature
Pressure
Air Quality and CO2
Zener Barriers
Universal Transmitters
[phone]
[e-mail]
www.seikom-electronic.com
SEIKOM-Electronic GmbH & Co. KG
Fortunastraße 20
42489 Wülfrath