Specifications; Design And Function - WIKA 831 Mode D'emploi

3. Specifications / 4. Design and function

3. Specifications

IP Ingress protection
GB
The ingress protection to EN 60529 against external influences depends on the
basic instrument and is found in the respective data sheet.
Admissible ambient temperatures
The inductive contacts can be used in the range from -25 to +70 °C (SN sensors
up to +100 °C). Where the permissible temperatures for the basic instrument (see
data sheet) deviate from this range, the lower value is valid.
When operating in potentially explosive atmospheres, please note the reduced
values (see respective EC-type examination certificate).
For the type of the integrated slot sensors, see the measuring instrument's
product label.

4. Design and function

Description
The built-in electrical switch contacts are non-contact slot-type inductive proximity
sensors, which are powered from switching amplifiers with certified intrinsically
safe circuits. When the adjustable set points are reached, their output circuits will
be opened or closed.
As standard model 831 slot sensors, to EC-type examination certificate
■
PTB 99 ATEX 2219 X (see appendix 1) and ZELM 03 ATEX 0128 X (see
appendix 3), are used
Model 831-SN and -S1N SN sensors, to PTB 00 ATEX 2049 X (see appendix
■
2) and ZELM 03 ATEX 0128 X (see appendix 3), are special designs with
safety features (that are not relevant to explosion protection) for special
applications
The connected loads for the switches are in accordance with EN 60947-5-6
(NAMUR).
Suitable switching amplifiers for model 831 are:
With type 1 circuit: Control unit KFD2-SR2-Ex1 and
With type 2 circuit: Control unit KFA6-SR2-Ex1 and
Suitable switching amplifiers for model 831-SN and 831-S1N are:
With type 2 circuit: Control unit KFD2-SH-Ex1 and
8
KFD2-SR2-Ex2
KFA6-SR2-Ex2 - model 904.28/29
KHA6-SH-Ex1 - model 904.30
WIKA operating instructions inductive contact model 831