SICK GMS815P-PS-3G

12 GMS815P-PS-2G/-3G · Supplementary Operating Instructions · 8016234 V2.0 · © SICK AG
Product Description
Subject to change without notice
2.2.2 Differing features
● Usable in potentially explosive atmospheres in the particular zone, explosion group and
temperature class specified on the type plate (→ p. 10, §2.1).
● Limitations on product variants to be maintained vary when measuring combustible
gases (→ p. 8, §1.5).
● The interface box (→ p. 11, Fig. 1) is always fitted on the Enclosure GMS815P-PS-2G and
is an option for the Enclosure GMS815P-PS-3G.
2.2.3 Options
● Intrinsically safe signal connections
● Interface box (only for GMS815P-PS-3G)
● Version for temperature class “T6” (in preparation)
2.3 Function of the pressurized enclosure system
Purpose
The pressurized enclosure prevents an explosive atmosphere being created inside the
enclosure. To this purpose, the gas analyzer enclosure is filled with a protective gas. Apart
from that, it also ensures the gas pressure inside the gas analyzer enclosure is higher than
the ambient air pressure.
Safety functions
● The enclosure is pre-purged automatically before start-up. The mains supply for the gas
analyzer is first switched on afterwards.
● The mains supply of the gas analyzer is switched off automatically should the pressur-
ized enclosure not be in the correct operating state (malfunction).
Functionality during operation
The pressurized enclosure system functions in “leakage compensation” operating mode: A
certain protective gas pressure is created in the gas analyzer enclosure after pre-purging
has completed. If the protective gas pressure drops below the minimum pressure set, pro-
tective gas feed is activated until the rated pressure is reached again.
On the Enclosure GMS815P-PS-2G, a certain amount of protective gas leaks out of the gas
analyzer enclosure through the protective gas outlet. This means the protective gas feed is
activated often to restore the pressure. This creates a more or less permanent protective
gas flow with the required flowrate.
▸ If the Enclosure GMS815P-PS-3G does not have an interface box fitted:
Maintain the requirements in accordance with EN 60079-2 “Explosive
atmospheres – Part 2: Equipment protection by pressurized enclosure “p””
/Section 7.
● Function of the interface box → p. 20, §3.7.1
● It may be necessary to use the interface box due to the planned operating
conditions.