Seikom Electronic RLSW 8 LCD User manual

UserManual
RLSW®8 (M8) LCD
24 V AC/DC
Version 1

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User Manual
RLSW®8 (M8) LCD
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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 .............................................................................. 7
4.1 Installation Conditions............................................................................................................. 7
4.2 Electrical Connections / Terminal assignment.......................................................................... 8
4.3 Setting the Switching Point ...................................................................................................... 8
4.4 Menu settings ........................................................................................................................10
4.5 Presentation of the measurement results on the display..........................................................10
5. MAINTENANCE INSTRUCTIONS....................................................................................... 12
6. ERROR MESSAGES ......................................................................................................... 12
7. EU DECLARATION OF CONFORMITY................................................................................ 14

User Manual
RLSW®8 (M8) LCD
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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 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.
2. GENERAL INFORMATION
The RLSW®8 is a microcontroller-based volume flow meter, which monitors gaseous flows or the
volume flow in the range of approximately 0.1 ... 200 m/s (up to 63,000m³/h, 63,000l/min).
A 4 ... 20 mA and a 0 ... 10 V DC output are available as output signals for the flow. To increase
operational safety, the sensor and the evaluation electronics are monitored for function and errors
during operation. The sensor connection line is constantly monitored for short circuit and wire
breakage.
2.1 Proper Use
The flow monitors of the RLSW®8 series are designed for monitoring gaseous media or the volume flow
within the specified technical data. Main fields of application are heating, ventilation and air
conditioning in the field of building automation.
2.2 Function Principle
Flow monitors of the RLSW®8 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.

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3. TECHNICAL DATA
Type
RLSW®8 LCD
RLSW®8 M8 LCD
Device construction type
Compact device with
permanently mounted probe
Separate sensor and
electronics connected by
cable
Article-No.
81530
81530M8
Operating voltage
24 V AC/DC
Voltage tolerance
± 5%
Overvoltage category
II
Signal lamp voltage
Mains present, green LED
Power consumption
4 VA
Ambient temperature
-20 …50°C
Signal output flow
0 … 10 V, linear Ra = 0.4 kOhm
Signaloutput for flow (mA)
4 … 20 mA, linear Ra = 0.4 kOhm
Relay output
1 normally open contact
(Terminals 8/ 9 close or open in case of flow)
Switching function at flow rate
Switching point adjustable via potentiometer
Transistor output (NPN)
Open collector / non-conductive with current, max. 250 mA
Reproducibility of the output
signal
±2%
Temperature dependence of
the output signal
±1%
Accuracy (reference at 22°C,
35% r. h. 1013 mbar)
±5% of full scale
Linearity error
±1% of full scale / ± 0.5K / ±1 mbar
Relay output
200 V AC/DC, 1 A
Minimum switching load
10 mA / 5 V DC
Signal lamp flow
LED-indicator und Display
Standby time (without start-
up bypass)
approx. 25 s
Media temperature range
-25 … 80°C
-25 … 80°C
(Optionally available up to
250°C or 350°C)
Temperature gradient
30 K/min
Switching point adjustment
With potentiometer
Measuring range maximum
0.1 … 30.0 m/s, optionally to 200,0 m/s
Speed dimension
m/s, l/min., m3/h
Volume flow maximum
63.000m3/h, 63.000l/min.
Immersion depth approx.
50 mm, 130 mm, 165 mm, 300 mm, 400 mm, 500 mm
(Special lengths optionally available)
Process connection
PG7, mounting flange (optionally M16x1,5, G 1/2“, M20x1,5)
Sensor material
MS, nickel-plated, optionally stainless steel
Pressure resistance
10 bar
Electrical connection
9 terminals, max. 1,5 mm²
Protection category,
housing/ sensor
IP54/ IP67
Pollution class
II

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Housing dimensions
(L x W x H)
56 mm x 86 mm x 82 mm
Reference conditions: inflow path 10 x DN, outlet path 10 x DN, laminar flow, at 0°C and 1.013 bar.
Increased operational safety for your machine/plant through continuous monitoring of the
sensor, the sensor elements and the connecting cable for short circuits and wire breaks
during operation. In addition, the electronics are continuously monitored by internal test
routines. If one of the aforementioned errors occurs, the outputs drop out and the error is
indicated by means of an error code in the display and on the LED bar.
After switching on the operating voltage, the following processes are displayed:
LCD line 1: start 10s Time may vary depending on the setting.
LCD line 2: version xxx
After the start time has elapsed, the device goes into monitoring mode. Any errors that occur (see
"Explanations of the error code”) are displayed and saved. All outputs drop out. Displayed errors are
cleared by a restart (disconnect from the mains for at least 4 seconds).
3.1 Dimensions

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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 circuit of the potential-free contact must be protected with a
6.3 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. If necessary,
determine the area of strongest flow in the pipe cross-section and correct the sensor
position. The through-hole in the shaft of the sensor must be completely inside the duct.
▪There is a small indentation in the metal at the end of the probe. This mark is intended as a
mounting aid and should be placed in the direction from which the flow is coming.
▪For 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 ideally 10xD (inside pipe diameter) of free inlet and 10xD (inside pipe
diameter) of outlet path to avoid false measurement due to turbulence.
▪Screw in the flow monitor only via the sensor tube / the hexagon of the sensor housing.
▪Dew formation and contamination in the medium can falsify the measurement result.
▪Check electrical connection.
▪The volumetric meter must be started before the fan (flow generator / compressed air...).
Optimum measurement results can only be achieved if the sensor is installed in the optimum position
and the inlet and outlet distances are observed. At high and borderline temperatures, the radiant heat
of the pipe network can possibly influence the signal output. The device also works despite non-
observance of inlet distances, whereby the reproducibility, accuracy and linearity errors may,
however, have tolerances.
Probe and device are calibrated in pairs and are intended for use together only. Interchanging
can cause malfunctions.
The cable must not be shortened, lengthened or exchanged, this may cause malfunctions. A
longer sensor connection cable is available if required.
The remote probe must not be removed from the device before or during operation.

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4.2 Electrical Connections / Terminal assignment
1
2
3
4
5
6
7
8
9
| | | | | | | | |
24 V DC 10 V Temp -20 mA Flow Alarm OC Relay
Ground 10 V Flow +20 mA Flow Relay
Terminals 2 and 5 must not be bridged.
4.3 Setting the Switching Point
The device is already preset at the factory and can be put into operation immediately after mounting
and wiring without any further settings. Please refer to the device description on the delivery note for
the preset parameters. An adjustment is possible at any time for the version with LCD display and can
be made as shown in the menu description.
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 point is set via the potentiometer on the evaluation unit of the air flow monitor. An LED
flashing twice per second in the ten-part LED chain indicates the set switching point.
The current air flow is displayed relative to the maximum air flow via the LED chain (e.g.: maximum air
flow = 10m/s, three lit LEDs correspond to 30% of the maximum air flow. Thus, 3 m/s air flow is
measured).

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If the percentage value is constantly above 100%, the LED on the far right flashes at a high frequency.
Then an adjustment in the menu item "Speed Max" is useful.
If the air flow is permanently at a very low level, the LED on the far left flashes at a low frequency.
Other switching point setting options 1 (optional): Relative
If the switching point is set to "flow%" under menu item 4: "Alarm", you will be prompted to set
a number between 1 and 99 when you press T1. This number corresponds to the switching point
in percent of the set maximum flow, e.g.: Maximum flow = 10 m/s, switching point 50%, real
switching point is then 5 m/s.
Additional switching point setting options 2 (optional): Reference
If the switching point is set to "ref%" under menu item 4: "Alarm", you are prompted to set a
number between 1 and 99 by pressing T1. This number corresponds to the switching point in
percent of a value, which is automatically acquired as soon as the menu is left or the device is
restarted. The acquisition takes 120 s. During this time the flow is measured and at the end of
the time an average value is formed. The switching point is determined from this average value
LED Voltage supply
Button T1
LED Ready for
operation
Terminal
LED string for flow indication
Potentiometer switching point
adjustment
Button T2

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4.4 Menu settings
You enter the programming mode by pressing and holding (approx. 3 s) T1. Please note that the
number and type of menu items may vary depending on the specification and version. The
program sequence is fixed and cannot be changed by the user.
Step
Display
German
Display
English
Selection
Meaning
1
Language
language
german/english
Menu language
customization
2
geschw dim
flow dim
m/s, m³/h, l/min
Air flow dimension
3
geschw max
flow max
0…70m/s
Maximum air flow
4
Rohr Durchm
pipe diam
1…2500mm
Pipe diameter in mm
5
Alarm
alarm
Pot, flow%
Alarm selection
6
alarm hyst
alarm hyst
0…99%
Alarm hysteresis
7
alarm verz
alarm del
0…255s
Alarm delay
8
start verz
start del
3…300s
Start delay
9
kal fakt
cal fact
30…255%
Calibration factor
10
RelaisFkt
RelayFct
NOP/NOC
Relay behavior
Menu control via button T1 and button T2 (T1 = weiter/ continue, T2 = wähle/ select).
To finish your programming, exit the menu under "Display ok" with "save and exit", otherwise
the data will be lost.
If the dimension of the display is changed (e.g. from m/s to l/min), it is absolutely necessary
to readjust the switching threshold and, if necessary, the measuring range. If, for example, 5
m/s was previously set, the device will also react to the value "5" in the new dimension.
When ordering, please specify whether you want to change the dimension and/or which
dimension should be displayed. The default setting can be made at the factory on request.
There is a protective film on the LCD module at the factory that protects the display from
scratches. This can be removed carefully to increase the contrast.
4.5 Presentation of the measurement results on the display
The RLSW®8 LCD offers various options for displaying the current air flow/volume flow and the
media temperature. By default, the relative flow is displayed in the first line. The second line is
used to display the absolute air flow. By pressing T2 the display can be changed over.

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Outputs
The output relay provides a normally open contact: The contact closes when the set switching
threshold is reached and exceeded/ terminal 8/9.
The switching threshold of the transistor output (alarm OC/ open collector/) is also set via the
potentiometer analog to the relay output.
The following analog linear outputs are also available:
Output
Dependency
Electrical connection
0 …10 V DC
Air flow / volume flow
Terminal 4 (+) and 2 (Ground)
4 …20 mA
Air flow / volume flow
Terminal 6 (+) and 5 (-)
Information on the RLSW®8 M8 with remote sensor
The RLSW®8 is also available with a remote probe. The supplied probe has a connection cable with a
length of 2.5 m as standard (special lengths available on request). This length must not be changed
due to calibration. The connection is made
via an M8 plug. The plug must not be
removed from the line.
When mounting the evaluation unit,
please ensure that neither the plug nor the
cable are kinked. Only the supplied
mounting set may be used for mounting!
Please allow sufficient space for the plug
during installation!
Dimensions M8 connector

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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.
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 a 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.
Sensor is not installed
correctly
Carefully clean the sensor
with water.
Check the installation
conditions. Connect sensors
to device according to
assignment.

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Device has no output signal
Terminal 2 + 5 bridged
Disconnect terminal 2 + 5 and
restart device. If the error
message appears again,
contact SEIKOM support.
Device switches in the event
of a rapid media temperature
increase.
Temperature gradient is
outside of technical
specifications.
Turn the potentiometer a little
further clockwise.
Set switching point in hot
media environment.

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7. EU DECLARATION OF CONFORMITY

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