Seikom Electronic RLSW4 Manual de usuario

UserManual

RLSW®4 (R)

24 V AC/DC

Version 1

Page: 2

+49 2058 916 900 0 •info@seikom-electronic.com •www.seikom-electronic.com

User Manual

RLSW®4 (R)

+49 2058 916 900 0 •info@seikom-electronic.com •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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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)

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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

M16x1,5

50mm

35mm

PG7

Flange

47mm

14,2mm (10mm)

15mm

37.0 mm

Locking screw

4.0mm

User Manual

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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)

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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

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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)

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7. EU DECLARATION OF CONFORMITY

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