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General
The electrical value limit switches (low-action or snap-action contacts), fitted as auxiliary switches into measuring
gauges, which - depending on the direction of movement - make or break an electrical control circuit at the set
limit value by means of a contact arm which is moved by the actual value pointer.
Adjusting key
Mounting
Mounting has to be done according to the general technical regulations for pressure and temperature measu-
ring gauges (EN 837-2 or EN 13190). Excessive vibrations can be detrimental to function and service life of the
instrument. In consequence, the location should be exempt from vibration. Protection according to EN 60529
against external influences depends on the basic gauge and can be seen in its data sheet.
Electrical connection
The electrical connection should be performed only by qualified personnel. The terminal location and the switch
functions are indicated on the rating plate of the gauge. The earth terminal as well as the connectors (1...6) are
marked accordingly.
Safety remarks
When installing, commissioning and operating these instruments, the national safety regulations have to be
observed. Always disconnect voltage source and unit when working. Skilled personnel only should be allowed
to work with these instruments.
Table 1
Technical Data
Max voltage (MSR) U
Current ratings:
Closes rating
Break rating
Continuous load
Maximum load
Material of contact points
Over current protection / relais
There is no over current protection installed in these apparatuses. If protection is required, we recommend to
observe the values per EN 60947-5-1 and the values of table 2.
Table 2
Voltage
(DIN IEC 38)
Volt
DC
220
110
48
24
Adjustment of the sett pointer
The adjustment of the set pointer is made in the adjusting lock of the window by means of the adjusting key
supplied. The set pointers of the limit value switches are adjustable over the whole scale range.
Maintenance
The gauges are maintenance free. Indication and switching functions shoul be checked about one or two times
a year. When checking the indication and the switching functions, the gauge has to be
separated from the process and a pressure / temperature standard has to be applied. Repair can exclusively
be carried out at the factory.
Notice
For the mounting of the measuring gauges onto the pressure / temperature tapping point, please refer to the
instruction manual:
gauge: Typ R, P
Art.-Nr.: 413074
Typ DM
Art.-Nr.: 413077
Typ B
Art.-Nr.: 413088
Typ F
Art.-Nr.: 413089
Maximum contact load with resistive load
Sliding contact-type S
dry Gauges
250 V
eff
0,7 A
0,7A
0,6 A
10 W / 18 VA
Silver-nickel (80% silver / 20% Nickel / 10 microns gold plated)
Sliding contact type-S
dry Gauges
inductive
resistive load
Load
cos φ > 0,7
DC
AC
AC
mA
mA
mA
230
40
45
110
80
90
48
120
170
24
200
350
100
Magnetic snap-action contact type-M
dry Gauges
250 V
1,0 A
1,0 A
0,6 A
30 W / 50 VA
Magnetic snap-action contact type-M
dry Gauges
inductive
resistive load
Load
cos φ > 0,7
DC
AC
mA
mA
mA
25
100
120
65
45
200
240
130
70
300
450
200
400
600
250
Set pointer
Magnets
only for type M
Liquid filled Gauges
250 V
1,0 A
1,0 A
0,6 A
20 W / 20 VA
Liquid filled Gauges
inductive
resistive load
Load
cos φ > 0,7
DC
AC
mA
mA
mA
65
90
40
130
180
85
190
330
130
250
450
150
Quality for the
future
3
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