GB
GB
17
For certified switches, please follow the following rules:
1. Use an appropriate cable gland; it should at least comply with the requirements of the certified enclosure. Check
that the cable is properly enclosed and that it is not under tension.
2.
Do not use additional components, such as break wire resistors.
Electrical requirements
To comply with VDE 0116, a current limiter (fuse)
[F] is required. The current limiter shall have a value
of 0,6 x the nominal current of the micro switch.
5 SETPOINT
ADJUSTMENT
See figure 13 and 14.
There are two different design for the adjusting nut (1). This has no influence on the principle.
For proper adjustment, the process should be simulated as closely as possible. Particularly in the case of differential
pressure switches: adjust the setpoint at the static pressure which will occur during operation.
In the following text, ‘pressure’ can be replaced by ‘differential pressure’ or ‘temperature’, depending on the function of
the switch (see table 1 in §1.2).
1. Use an SW19 open-ended spanner to turn the adjusting nut (1).
2. Turn the adjusting nut clock-wise to increase the setpoint.
Use a calibration tool when making fine adjustments, or read off the approximate setting from the indication scale
(2), using the top of the nut as a guide.
3. To check the setpoint, lower the pressure to at least 20% below the setpoint. Increase the pressure slowly.
Switching can be detected electrically: at test pressures below the setpoint, there is contact between “C “en “NC”,
see figure 16.
6
EC DECLARATION OF CONFORMITY
Directive 89/392/EEC, Annex II, sub C
BETA BV
herewith declares that:
Pressure- & Temperature switches BETAß
type B-, C-, M-, V-, W-, Z-series
-
is in compliance with the machinery directive (89/392/EEC, as amended, 91/368/EEC, 93/44/EEC,
93/68/EEC);
-
is in conformity with the provisions of the following other EEC directives: 73/23/EEC
Maarssen, the Netherlands
October 1996
C
F
