Siemens SITRANS F M Intermag 2, Руководство по эксплуатации

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Installation
3-21
SITRANS FM Intermag 2 Flow Transmitter
Operating Manual - A5E00102775-03
3.6 Special information for devices with explosion protection
The variants 7ME5033-**C**, -**D** and -**G** are category 2G
devices for use in zone 1.
The electronics compartment of these devices is fundamentally
explosion-proof. The terminal box for auxiliary power and signal outputs
is available either as explosion-proof version or version with increased
safety. The signal outputs are optionally not intrinsically safe or
intrinsically safe (only in connection with 24 V supply).
The sensor connection contains an electric circuit with increased safety
and two intrinsically safe electric circuits [ia].
The EU type examination certificate (see appendix - chapter 7) must be
observed. Please pay also attention to the regulations and
specifications for the installation and operation of systems in hazardous
areas valid in your country.
Using remote models, measuring transducers and sensors must be
connected via an adequate equipotential bonding. The outer terminals
on the measuring transducer housing or on the housing flange of the
measuring sensor are designed for this purpose.
The supply lead of the auxiliary power must be protected with an
external fuse with a max. 4 A and an interrupting potential of 1500 A.
All cables to the measurement sensor as well as the cable glands on
the measurement sensor must be rated for a temperature of at least
+85
_ C. At ambient temperatures of less than 40 _ C around the
measurement sensor, a temperature rating of +70 _ C is considered as
adequate.
Unused cable glands for the exlposion protection type EEx e must be
sealed with certified blind plugs. With measuring transducers of
explosion protection type EEx de [ia] (7ME5033-**C**), unused cable
glands may only be replaced by screw plugs. Use only cable glands or
screw plugs which are certified for explosion-proof enclosures.
Output circuits of devices with intrinsically safe signal outputs
(7ME5033-**G**) may only be connected with certified intrinsically safe
devices or barriers. The devices connected must be incorporated in the
equipotential bonding of the measuring transducer. The permissible
maximum values for current, voltage, power, connectable capacity and
inductance specified in the EU type examination certificate (appendix in
chapter 7) must be unconditionally observed.
If the device is live (auxiliary power or external current of the signal
outputs), the housing cover may not be unscrewed in hazardous areas.