www.armano-messtechnik.com • p. 13 of 20 • GB • 09/22 • B1 •
B00-100
Operating Instructions Pressure Gauges
Selection Criteria, Measuring Arrangements, Installation and Operation Manual
10.
Installation in Potentially Explosive Areas
10.1 General Information
Pressure gauges are mechanical pressure measuring
instruments that do not have any potential ignition
sources during its intended operation. Versions made
of stainless steel with laminated glass are suitable for
the application in areas of category 2 and 3 according
to ATEX directive 2014/34/EU.
For the application in category 1 (e.g. installation to
zone 0), only pressure measuring instruments with
integrated, type-approved flame arrester, our model
Adapt FS, are suitable. This protection system avoids
flame penetration in case of deflagrations of potential-
ly explosive vapour-air and gas-air mixtures of explo-
sion groups IIA, IIB and IIC in an upstreamed volume
of max. 0.2 l. The flame arrester “Adapt FS” is certified
with
II G IIC PTB 12 ATEX 4001 X
on condition that the operating pressure does not ex-
ceed 1.1 bar abs. and the operating temperature does
not exceed 60 °C
(140 °F)
.
To avoid heating of the measuring elements of Bour-
don tube pressure gauges, dynamic load is not permis-
sible with gaseous media!
10.2 Marking for the Explosion Hazardous Area
Pressure gauges without limit switch contact assembly
are marked as follows for the application in explosion
hazardous areas.
Example:
Bourdon tube pressure gauge model RCh100 – 3,
manufacturer ARMANO Messtechnik GmbH
ARMANO Messtechnik GmbH
Manometerstraße 5
•
46487 Wesel
Bourdon tube pressure gauge model RCh 100 – 3
II 2G Ex h IIC Gb
II 2D Ex h IIIC Db
Temperature range −25 / +75 °C
(content obligatory, free layout)
The maximum temperature of +75 °C
(+167 °F)
was de-
termined as part of a “self-certification” with an addi-
tional safety of 10 K for the use in explosion hazardous
areas, which require temperature class T6.
Please observe the temperature specifications on the
nameplate to avoid hot surfaces due to increased am-
bient or medium temperatures.
Notwithstanding the above, for medium tempera-
tures T
M
≥ 75 °C, pressure gauge versions for combus-
tible substances, which may come into contact with
T
M
≥ 75 °C, are available. They can be marked accord-
ingly, the technical design remains unchanged.
If gas / air (dust / air) mixtures have a considerably
higher ignition point than T
M
, these would be such
substances. (Written confirmation of the operator with
description of the measuring point!)
Marking example for medium T
M
= 150 °C
(302 °F)
II 2G Ex h IIC Gb
II 2D Ex h IIIC Db
Temperature range −25 / +150 °C
(−13 / +302 °F)
Only for measuring point ###!
In that example, this allows for use in potentially ex-
plosive atmospheres, which require temperature class
T3 (maximum permissible surface temperature of the
equipment < 200 °C
(< 392 °F)
).
(The prerequisite is that the pressure gauge is general-
ly resistant to this temperature.)
Please contact the manufacturer in case of uncertainties.