The Heater must 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 operation of the Heater.
The Heater may only be operated in conjunction with a protective system. Function and reliability tested variations in accordance with the relevant rules and regulations are to use as safety device for temperature, flow, level etc.
The position of the temperature sensors of the temperature limiters required for the explosion protection must include the changed operating conditions caused by a phase failure in three-phase systems.
Heating of liquids is only allowed with enough liquid overlap. That can be fulfilling by level monitoring device or comparable protective measures.
For flushing medium, additionally a flow monitoring device may be necessary to secure a minimum flow.
When use in explosive dust atmospheres, adequate measures must be taken to prevent dust deposits on the heated part of the heaters.
Repairs of the flameproof joints must be made in compliance with the constructive specifications provided by the manufacturer. A repair according to the values specified in tables 2 and 3 of IEC 60079-1 is not permitted.
The Heater is equipped as standard with cable gland by the manufacturer. The cable gland may be used only for fixed installation; the operating company has to ensure an appropriate clamping method.
Cables specified by the manufacturer in the operating instructions have to be used in the heater design with direct Ex d cable entry (without Ex e connection box). If the supplied cable glands and cables are not being used the corresponding requirements in IEC 60079-14, Paragraph 10.6.2 have to be noticed. The direct cable glands in the heater enclosure DH..A0… have to be tested with 45 bar at minimum at use in explosion group IIC and below -20 °C.
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 the connection cables must be suitable for the appropriate operating temperature.
Unused openings for cable entries must be closed durably with suitable screw plugs, which are certified for explosion protection in the corresponding type of protection.
The special conditions contained in the respective certificate have to be noticed at use of certified components or devices in type of protection Ex i.