Elmess EHG Betriebsanleitung Seite 10

Beschreibung der Heizung
Description of heater
2. Conditions for safe operation of the heater
 The heater may only be operated in the specified mounting position and under the specified ambient
temperature conditions. It should be ensured that the heat emission is evenly distributed and not
obstructed during operation.
 The heater may only be operated in conjunction with a safety system. The design of safety devices,
devices of the safety system used for temperature, level, flow etc. must have been tested for
function and reliability on the basis of the relevant rules and regulations.
 The position of the temperature sensors of the temperature limiters must include the changed
operating conditions caused by a phase failure in a three-phase system.
 Heating of liquids is only allowed with enough liquid overlap. That can be fulfilled by a level
monitoring device or comparable protective measures.
 For flowing media, additionally a flow monitoring device may be required to secure a minimum flow.
 When used in explosive dust atmospheres, adequate measures must be taken to prevent dust
deposits on the hot surfaces.
 Only the manufacturer is permitted to carry out repairs on the flame-proof gaps or openings. A repair
according values of table 2 and 3 of IEC EN 60079-1 is not permitted.
 The heater is, as manufacturer standard, equipped with cable glands for fixed installation. Stress
relief has to be assured by the operator.
 Cables as specified by the manufacturer in the operating instructions have to be used for heater
design with direct Ex d cable entry (without Ex e connection box). If the supplied cable glands and
cables are not being used, requirements of IEC EN 60079-14, paragraph 10.6.2, have to be observed.
The direct cable glands in the heater enclosure DH..A0... for use in gas group IIC and below -20°C
have to be tested with 45 bar at minimum.
 Unused openings for cable entries must be closed durably with certified screw plugs according to EN
IEC 60079-14.
 The maximum operating temperature on ex-relevant components (seals, cable bushings, connection
terminals) must not exceed +80°C. At operation with lower ambient temperature less than -20°C
down to -60°C, the cable gland and connecting cable must be suitable for the operating temperature.
 At use of certified components or devices in type of protection Ex i, the special conditions of the
respective certificate have to be noticed.
ELMESS-Thermosystemtechnik GmbH & Co. KG
EHF EHG EHK BVS 11 ATEX E 088 X_Rev-26-11-2015
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