SEIKOM ELECTRONIC RLSW5 Flow Controller Instruction Manual

Flow Controller
Operating Instructions for Flow Controller
RLSW5 and RLSW5/F3 Our products correspond to the requirements of the European guidelines
WEEE 2012/19/EU – RoHS 2011/65/EU ****

General Information

The calorimetric airflow controller RLSW5 represents an economical alternative to the common pressure pickup. The installation is simple and quick by means of a flange mount (for channel installation) or by means of the PG7 threaded connector. The switching point can be selected infinitely with the integrated potentiometer. In case a flow is present, the switching output is conductive (yellow LED in the unit is on).
Proper use
The flow controllers of the series RLSW5 are intended to be used in monitoring of flow speeds of gaseous media within the specified technical data. A main area of application is heating, ventilating and air conditioning in the field of automated building systems.

Function principle

The flow controllers of the series RLSW5 function according to the calorimetric principle. The units are switched when a certain pre-selected threshold value is reached. In the calorimetric measuring principle a temperature sensitive resistor is heated. The heating procedure is achieved by a separate heating 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 of 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 near the first one. The second precision resistor (temperature compensation) is not heated and serves to measure the temperature only.

Flow>= threshold value| Signal output switched| Yellow LED “Airflow” enlightened
---|---|---
Flow< threshold value| Signal output not switched| Yellow LED “Airflow darkened

Technical Data

DIN EN 61010-1:2011-07
Accessory |  Type examination TÜV Nord
DIN EN 61010-1:2011-07
Flange 79781 10mm| Flange 79781 10mm

Attention!
Connection and commissioning must be performed by properly authorized and qualified personnel!
Connections to mains 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 6A.
Therefore, the electrical circuit of the potential-free contact must be protected by a 6.3A fuse.
Installation Conditions RLSW5
To avoid malfunctions, the following points should be observed:

• 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.
• In case of vertical pipes, the direction of flow should be upwards.
• Maintain the flow controller by means of the hexagon of the senor housing only.
• The flow controller can be installed any position.

Electrical connection

Dimensions

Setting the Switching Point

The interrelation between air speed and resistance change is not linear. In the lower range (low rates of flow) the change of resistance is very large. In the upper range, the change of resistance at identical changes in the rate of flow 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 behavior.
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 behavior.

Installation Instruction

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.
• 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.
• Maintain the flow controller by means of the hexagon of the senor housing only.
• The flow controller can be installed any position.
• Perfect measuring results need a perfect installation!

Commissioning of RLSW5
Start-up bypass

Jumper set| Start-up bypass active for approx. 60s, yellow LED “time” is enlightened
---|---
Jumper not set| Start-up bypass inactive

Connection and commissioning must be performed by properly authorized and qualified personnel!
When commissioning and adjusting the devices, 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 (3xD). Align the mark to the airflow.

• Set jumper for start-up bypass, if required.

• Set trimmer „Sensitivity” to minimum sensitivity (left limit stop).

• Connect mains 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 RLSW5 is released).

The device is now set to function.
What to do if the monitoring device does not work properly

voltage and connection
device does not recognize flow| sensor is not installed properly| check the sensor’s installation
| flow is out of range| change the tube’s diameter
device reacts in a different way| sensor is highly polluted| maintain the sensor
device reacts in fast media temperature changes| temperature gradient is out of range| check the temp. gradient of your installation

Mistakes and misprints are not to be excluded. All information „without guarantee“.
03/2022
◆ SEIKOM-Electronic GmbH & Co. KG ◆ Fortunastr.20 ◆ D-42489 Wülfrath
◆ Telecon: +49(0) 20 58/20 44 ◆ Fax: +49(0) 20 58 / 79 111 ◆
◆ E-Mail: info@seikom-electronic.com ◆ Internet: http://www.seikom-electronic.de ◆

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