Seikom RLSW4A M8 Bedienungsanleitung Seite 4

The RLSW4A is a compact unit including a air flow monitoring device as well as sensor.
The sensors shell is used for installation. RLSW4AM8 has a separate sensor
(2,5m length cable) with M8 connector.
The RLSW4A shows and reacts to the flow relatively. To use this ability you can apply
its analogue output to your needs and the current flow by setting up the output voltage
(max. 10VDC).
Proper usage:
The RLSW4A is to be used as an air flow monitoring device watching gaseous media within its technical data. Its
application area is e.g. ventilation and air conditioning installations, filter watching, supply and exhaust gases.
Measuring principal:
A temperature-sensitive resistor is heated according to the calorimetric measuring principle. The temperature-
sensitive resistor is heated by a second resistor. A flow in the medium dissipates heat from the measuring
resistor, causing the resistor temperature an impedance to change. This temperature change is evaluated.
Since both the velocity and the temperature of the flowing medium affect the dissipated heat, a relationship
must be created between flow and temperature. For this purpose, a second temperature-dependent measuring
resistor is located next to the first one. The second measuring resistor (temperature compensation) is not
heated and is only used for the temperature measurement.
Technical Data:
Type RLSW4A
Article No. 74825A
supply voltage 24VAC/DC
supply voltage tolerance +/-5%
over voltage category ||
signal, supply voltage green LED
power consumption 2VA
ambient temperature -20..+60°C
signal output, flow in V 0..10V (Ra=10kOhm) relatively
precision of output signal +/-10% measured value
reproducability of output
signal +/-2% upper range value
media temperature 0..70°C
temperature gradient 15K/min
mesurment range 0.1-30m/s
sensor built in
immersion depth 130mm
process connection PG7, flange (optional)
sensor material MS58, nickel plated
presure resistance 10bar
electrical connection IP54
protection class housing IP67
pollution class ||
protection class sensor 3 clems, 2.5mm²
housing dimensions L=56mm; W=84mm; H=82mm
mark of conformity CE
Accessory (optional) flange
Secial design for cable lengt and immersion depth on request.
RLSW4A M8
74825AM8
24VAC/DC
+/-5%
||
green LED
2VA
-20..+60°C
0..10V (Ra=10kOhm) relatively
+/-10% measured value
+/-2% upper reange value
0..70°C
15K/min
0.1-30m/s
Separate sensor 2,5m length cable
with connector
130mm/ optional 50mm
PG7, flange (optional)
MS58, nickel plated
10bar
IP54
IP67
||
3 clems, 2.5mm²
L=56mm; W=84mm; H=82mm
CE
flange
Installation Instruction:

The sensor should be mounted in such a way that the air flow passes through the lateral opening.
The marking is intended as an assembly aid.

Installation where there is low turbulence, if possible.

Do not install directly behind bends (distance approx 10x bend radius).

Install the probe in the middle of the duct where possible (distance at least 1/3 of the duct diameter
from the wall).

Do not install directly behind the heating register (rapid changes in temperature may lead to the
measured values being falsified.
Electrical connection:
RLSW4A
1 2 3
24V
AC/DC
Dimensions: