Emerson Rosemount 935, Reference Manual

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1 Product overview
The Rosemount 935 Gas Detector employs an advanced xenon flash source and
integrated electronics package, both housed in stainless steel housings to provide high
quality and performance, fast response, and line of sight gas monitoring. The source/
detector is backed by a three year warranty.
This device detects ambient combustible gases over a path length of up to 660 ft (201 m)
even in harsh environments where dust, fog, rain, snow, or vibration can cause a high
reduction of signal. The device can maintain operation in up to 90 percent signal
obscuration and ±0.5 degrees of misalignment.
The detector is manufactured with heated optical windows to improve performance in
icing, snow, and condensation conditions. The programmable functions are available
through a HART
® port used with an intrinsically safe (I.S.) handled unit.
The source and detector unit enclosures are ATEX, IECEx, and UK CA approved Exd
flameproof with an integral segregated rear and an Exe terminal compartment to prevent
exposing the sensors and electronics to the surrounding environment. The detector also
has a plug interface for connection to a HART Field Communicator, which is intrinsically
safe.
Hence, the combined approval:
Ex II 2(2) G D
Ex db eb ib [ib Gb] IIB+H
2
T4 Gb
Ex tb IIIC T135 °C Db
T
a
=-55 °C to +65 °C
Reference Manual Product overview
00809-0100-4035 May 2022
Rosemount 935 7