12 | Baker Hughes
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12. Special Conditions of Use
12.1.
For Intrinsic Safety and Flameproof Type
a. It is under the user responsibility to check once a year the gasket and in the event of damage, to replace
the defective parts with manufacturer
’s replacement parts only.
b. For use in dusty hazardous areas, the user will have to proceed to a cleaning regularly the different
sides of the enclosure to avoid the deposits of dusts, the maximum thickness must be <5 mm. This
cleaning will be done using recommendations defined in
For safe operation, this can be done only if the local conditions around the device are free of
potentially explosive atmosphere.
c. To avoid any spark due to electrostatic discharges, it is requested to follow national and local
regulations applicable for explosible atmospheres. For example, the user will proceed a cleaning of the
device and mainly the plastic label with a wet rag to.
For safe operation, this can be done only if the
local conditions around the device are free of potentially explosive atmosphere.
d. The user will have to check the temperature increase on the 7700E positioner coming from the
mechanical part in contact with the 7700E positioner housing or through the process thermal radiation
be less or equal than the temperature classification allowed. This must be done in conformance with
national and local regulations applicable for explosive atmospheres.
e. If the 7700E positioner is mounted with the I/P4000 plastic baffle in the vertical position (uppermost), the
required ingress protection against water is invalidated; therefore, it shall only be installed in this
orientation if its location provides protection against falling water.
f.
This requirement is only applicable for multi protection marking. The final user during the 7700E
positioner installation on site must show the protection mode used on the serial plate.
12.2.
For Intrinsic Safety Type
•
The cable entry and its installation must have a protection level at least equal to IP6X.
•
For using in zone 0 with aluminum housing, precautions must be taken to prevent that apparatus is not
subject to any mechanical shocks.
•
The voltage supply connected on 7700E positioner connector must be certified for use in group IIC and the
loop intrinsic safety approved. The entity parameters of the voltage supply must be compatible with the
entity parameters of the 7700E positioner described
12.3.
For Flameproof Type
•
The cable entry and its installation must have a protection level at least equal to IP65.
•
When the ambient temperature is higher than 70°C, the user will have to choose a cable entry and a cable
compatible with the data of the table below:
T ambient
T cable
70°C
75°C
75°C
80°C
80°C
85°C
85°C
90°C
•
The minimal temperature of the cable is indicated on the serial plate.
•
When the ambient temperature is lower than -20°C, the user will have to choose a cable entry and a cable
compatible with the ambient temperature specified on the marking plate.
•
The cable entry must have a degree of protection at least equal to IP66.
•
Use only the following greases for the cable gland:
Type
Manufacturer
SI 33
ORAPI
GRAPHENE 702
ORAPI
MOLYKOTE 111
COMPOUND
MOLYKOTE
®
MULTILUB
MOLYKOTE
®
GRIPCOTT NF
MOLYDAL
