Technical alteration rights reserved.
WIKA Alexander Wiegand GmbH & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg • Germany
Phone (+49) 93 72/132-0
Fax (+49) 93 72/132-406
www.wika.de
9078061 01/2003 GB/D/F
10. Power ratings
Table 1: Maximum contact rating
Maximum contact rating Magnetic snap-action contact model 821
with non-inductive
Gas filled gauges Liquid filled gauges
(ohmic) load
Maximum voltage (MSR) U
eff
250 V 250 V
Current ratings:
Make rating 1.0 A 1.0 A
Break rating 1.0 A 1.0 A
Continous load 0.6 A 0.6 A
Maximum load 30 W 50 VA 20 W 20 VA
Note: None of the limit values for voltage,
current and capacity are to be exceeded!
We recommend the following load values to
ensure safe, continuous operation:
Table 2: Recommended contact ratings with
different nominal voltages and instrument
versions
Voltage Magnetic snap-action contact model 821
(DIN IEC 38) Gas filled gauges Liquid filled gauges
DC / AC
ohmic load inductive ohmic load inductive
load load
DC AC cos
ϕ
>0.7 DC AC cos
ϕ
>0.7
VmAmAmAmAmAmA
230 100 120 65 65 90 40
110 200 240 130 130 180 85
48 300 450 200 190 330 130
24 400 600 250 250 450 150
The switching current must not be less than 20 mA
with low voltages for switching reliability reasons.
11. Overcurrent protection devices
No overcurrent protection devices are installed
in the instruments.
Should overcurrent protection devices be
required we recommend the following values in
accordance with EN 60 947-5-1.
Voltage 24 V: 2 A
Voltage 250 V: 1 A
Data refers to miniature fuses M and
a maximum short circuit current 100 A.
12. Repairs / Complaints
Repairs are to be carried out by the
manufacturer only. The instruments must not be
opened, as this would result in indication and
switching point errors.
In the case of complaints the manufacturing and
product identification numbers have to be
stated. The manufacturing number is indicated
on the dial, the product identification number on
the type plate. When measuring, the
atmospheric pressure, the temperature during
measurement and the data of the reference
standard (model, class) always have to be
indicated.
The density monitors have to be exposed to a
specific temperature long enough (at least 2
hours) to ensure temperature equalisation.
For higher loads, and instruments with liquid-filled
cases, we recommend the use of a separate relay,
WIKA Models 905.1X.
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