<10. EXPLOSION-PROTECTED TYPE INSTRUMENTS>
10-2
IM 01R01B02-00E-E 12th edition October 01, 2014 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
10.1 General
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Only trained persons may use the instrument in industrial location.
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The instrument modification or parts replacement by other than an authorized Representative of
Yokogawa is prohibited and will void the certification.
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Electrostatic charge on painted surfaces may cause an explosion hazard. Avoid any actions that
cause the generation of electrostatic charge, such as rubbing with a dry cloth on painted face of
the
indicator.
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If the meter is mounted in an area where the use of category 2D apparatus is required, it shall be
installed in such a way that the risk from electrostatic discharges and propagating brush discharges
caused by rapid flow of dust is avoided.
10.1.1 Intrinsic safety
To ensure intrinsic safety it is not permitted to repair or to modify the electronic transmitter, the display, the
limit switches or the calibration EEPROM.
The electronic transmitters type -E /KS1, -H /KS1, -E /KS2, -H /KS2, -E /KS3, -H /KS3, -E /ES1, -H /ES1, -E /ES3,
-H /ES3, -E /ES2, -H /ES2, -E /FS1, -H /FS1, -E /NS1, -H /NS1, -E /CS1, -H /CS1, -E /GS1, -H /GS1, -E /US1,
-H /US1, as well as the limit switches option /Kx with option /KS1, /KS2, /KS3, /FS1, /CS1, /NS1, /GS1 are
intrinsically safe devices.
Power supply for the electronic transmitter and transmitter relay for the limit switches are associated apparatus
and should be installed outside any hazardous area.
The electronic transmitter must be connected to an intrinsically safe, certified power supply with a maximum
voltage and output power below the maximum values of the electronic transmitter (refer to Technical data, in the
concerning chapters). The combined internal inductance and capacity of the electronic transmitter and connecting
cables must be less than the permitted external inductance and capacity of the power supply.
Accordingly, the limit switches have to be connected to intrinsically safe, certified isolating switching amplifiers.
The relevant maximum safety values must be heeded at all times.
Especially in the case of high fluid temperatures, heated metering tubes or heat radiation by heat tracing, make
sure that the temperature in the indicator housing does not exceed the permissible maximum ambient
temperature of the transmitter (refer to Technical data, chapter 9).
10.1.2 Flame proof
In the RAMC with option /KF1, /EF1, /NF1, /GF1 the transmitter and the limit switches are mounted in a flame
proof housing.
Wait 2 minutes after switching power off before opening the cover.
The cover can only be opened after loosing the safety screw.
After closing the cover the safety screw must be fixed before switching power on.
The RAMC with option /KF1, /EF1, /NF1, /GF1 shall be connected up via suitable cable glands and / or conduit
systems that satisfy the requirements of
EN 50018 or
60079-1 sections 13.1 and 13.2 and for which a separate
test certificate is available. Cable glands and entry fittings (screwed conduit entries) as well as blanking plugs
of simple design may not be used. On connection of the RAMC /KF1, /EF1, /NF1, /GF1 using a conduit entry
approved for the purpose, the associated sealing facility must be arranged directly on the housing.
Unused openings must be closed off as defined in EN 60079-1 section 11.9 (e.g. certified blanking elements).
The RAMC with option /KF1, /EF1, /NF1, /GF1 shall be connected to the local equipollently grounding system.
Especially in the case of high fluid temperatures, heated metering tubes or heat radiation by heat tracing, make
sure that the temperature in the indicator housing does not exceed the permissible maximum ambient
temperature of the transmitter
(refer to Technical data, chapter 9).
WARNING
WARNING
