Ashcroft B7 series, Руководство по установке и обслуживанию

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8.3 Mounting/Installation
8.3.1 Process connection
As standard, the device is equipped for pipework mounting with a pressure connection shank pursuant to DIN EN 837-
3. The device is calibrated ex works for vertical installation.
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Connection to be undertaken by authorized and qualified specialist staff only.
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Three holes external to the enclosure for surface mounting. Location of these holes is shown in the general
dimension drawing.
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Units may also be mounted directly on the pressure line using the pressure connection.
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Use only with the mechanical process connection provided – regarding the configuration, see order code on the
device type label, with a matching threaded seal.
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When connecting the device, the pipes must be depressurized.
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The pressure metering pipe must be laid inclined in such a way that, for example, for measurements of fluids no
air pockets can form, and for measurements of gases no water pockets. If the necessary incline is not achieved,
then at suitable points water separators or air separators must be installed.
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The pressure metering pipe must be kept as short as possible and laid without sharp bends, to avoid the
occurrence of irritating delays.
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With liquid measurement media, the pressurized connection pipe must be degassed, since any gas bubble
inclusions result in measurement error.
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If water is used as the measurement medium, the device must be frost-protected.
Safety notice: When tightening control to pressure line, always use the wrench flats or hex on the lower
housing, and do not twist the device itself.
8.3.2 Electrical connection
Take note of the electrical data in the EU design type test certification and the locally-applicable regulations
and guidelines for installing and operating electrical plant in explosion risk areas (e.g. EN 60079-14, etc.).
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Connection to be undertaken by authorized and qualified specialist staff only.
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The electrical connection of the device is to be undertaken in accordance with the relevant regulations of the VDE
and the regulations supplied by the local utilities company.
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Disconnect the plant from the mains supply before wiring electrical connections.
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Before operating the switch all conduit entries and/or junction boxes need to be closed according to the required
safety and electrical codes.
a) Standard product has two 3⁄4 NPT conduit holes with one permanent plug. 3⁄4 NPT conduit holes can be
modified or reduced with ATEX approved adapters.
b) Available ATEX approved cable glands can be used.
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It is recommended that Teflon tape or other sealant be used on conduit, bushing, gland or plug threads to ensure
integrity of the enclosure.
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Cable couplers, glands and conduit connectors must have the correct electrical approvals.
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Always follow safety and electrical regulations when connecting these devices.
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The system ground of the device is marked with a green colored screw and/or by the ground symbol.
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ATEX approved switches have an external ground screw that must be connected..