Ashcroft B7 series, Руководство по установке и обслуживанию

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3 Use in explosion risk areas pursuant to Directive 94/9/EC (ATEX)
3.1 B7/D7/T7 flameproof enclosure and dust ignition protection by enclosure
Area of use:
Explosion risk areas Zone 1 and 2, and 21 and 22, risk from gases and dry dust
Permitted temperatures:
Permitted ambient temperature -20°C to +60 °C.
Permitted medium temperature in the pressure switch < 85 °C.
Warning! With gaseous media, the device temperature may increase due to compression heat. In
such cases, the rate of the pressure change must be regulated or the permitted temperature of the
measuring medium reduced.
To avoid additional temperature increase, the devices should not be exposed to direct exposure to sunlight when in
operation!
EU design type test certification:
The Ashcroft
®
7XX Series Pressure & Temperature Switches comprise a cylindrical two-part enclosure, consisting of a
base and cover, manufactured from die-cast aluminum 380 or stainless steel 316L. The cover treads into the base and
is secured against loosening by a 10-32 UNF-2B socket head cap screw. The base houses a range of various switch
elements and an operating rod. The base has three bosses at 90° apart on its side walls. The two opposing bosses
each contain a ¾” NPT cable entry port while the other boss provides a facility allowing connection to different
detecting elements retained by a mounting plate secured by six M5 x 12 hexagon head screws. The detecting
element, when filled, secures the operating rod preventing removal and contains two venting holes that ensure that the
interior of the enclosure is not subject to pressure greater than 2 lb/ft².
Switch element ratings up to:
15 A 125/250/480 VAC
6 A 34 VDC
500 mA 125 VDC
250 mA 250 VDC
Compliance with the Essential Health and Safety Requirements, with the exception of those listed in the schedule to
EC-type examination certificate, has been assured by compliance with the following documents:
This product complies with the following standards:
IECEx ATEX
EN 60079-0: 2011 Ed 6
EN 60079-1: 2007
EN 60079-31: 2013
EN 60079-0: 2012
EN 60079-1: 2007
EN 60079-31: 2013
The documentation has been filed with SIRA (see declaration of conformity).
Labeling:
II 2GD
Ex db IIC T6 Gb
Ex tb IIIC T85°C Db IP 6X
(Ta = -20°C to +60°C)