Kobold VKM Series, Operating Instructions Manual

Page: 5 / 34

VKM
VKM K11/0118 page 5
5. Use in Hazardous Areas
5.1. General
The Flow Meter and Switch do not have a potential igniting source of its own as a
mechanical operating device; it does not get any identification according to the
guideline 2014/34/EU ("ATEX 100a”).
The attachable contact at the sides, being a component of the whole unit,
requires certificates and/or approvals.
The measurement units can be used as follows:
a)
In the Zone 2 (Gas-Ex, Cat. 3G) in explosion group IIA, IIB and IIC
b) In the Zone 22 (Dust-Ex, Category 3D) with non-conductive dusts with a
minimum igniting energy of > 3 mJ
c) In the Zone 1 (Gas-Ex, Cat. 2G) in explosion group IIA, IIB and IIC
d) In the Zone 21 (Dust-Ex, Category 2D) with non-conductive dusts with a
minimum igniting energy of > 3 mJ
The Flow Meter and Switches are filled completely with medium in the normal
operation. Zone 2 or zone 1 conditions may be obtained for a short time.
The ambient temperature limit area is fixed as follows:
Execution
Medium
Temperature
Ambient
Temperature
Pmax
NBR-seal -20....+70 °C -20...+60 °C 250 bar
FPM-seal -10...+100 °C -10...+90 °C 350 bar
5.2. Contacts and Ex-Contact N/O (code F)
The VKM-1 and VKM-3 can be used in the Ex-area as follows:

Ex-Contact N/O (code F) according Category 2 G, 2D Group II,
Zone 1 and 21.

Standard-contacts (Code R, U, C or D) according Category 2G and 2D,
Group II, in zone 1 and 21 in connection with a switching amplifier for
protection type Ex II (2)GD [EEx ia] IIC (intrinsically safe)
The VKM-2 (without switching contact) can be used according Category 2G and
2D for the Group II in Zone 1 and 21.
The electrical connection is explained in section 8. Electrical Connection.