Seikom Electronic RLSW 7 Bedienungsanleitung

UserManual

RLSW®7

24 V AC/DC, 230 V AC

Version 1

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User Manual

RLSW®7

Page: 3

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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 (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

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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.

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

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RLSW®7

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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

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

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

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RLSW®7

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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.

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▪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

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RLSW®7

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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.

▪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.

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RLSW®7

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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

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RLSW®7

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7. EU DECLARATION OF CONFORMITY

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