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Installation and Configuration Manual 31
Electrical Connections
Installation (Short Stem) Electrical ConnectionsInstallation (Long Stem)Introduction Installation (Short Stem) Electrical ConnectionsInstallation (Long Stem)Introduction Installation (Short Stem) Electrical ConnectionsInstallation (Long Stem)Introduction Installation (Short Stem) Electrical ConnectionsInstallation (Long Stem)Introduction
Chapter 4
Electrical Connections
4.1 Introduction
This chapter shows you how to wire up the 7827 digital viscosity meter and then connect it to the
Micro Motion
®
795x series of computers.
Note: Only Micro Motion signal converters and flow computers are able to interpret the signals from
the 7827 meter; it cannot be connected to equipment from other manufacturers.
4.2 EMC and cabling considerations
To meet the EC Directive for EMC (Electromagnetic Compatibility) it is recommended that the meter
be connected using a suitable instrumentation cable and earthed through the meter body and
pipework. The instrumentation cable should have an individual screen, foil or braid over each twisted
pair and an overall screen to cover all cores. Where permissible, the screen should be connected to
earth at both ends. Note that for intrinsic safety, termination of the screen to earth in the hazardous
area is not generally permitted.
To electrically connect the 7827 to a Micro Motion 795x series computer you will need the following:
• Minimum of 7-core screened twisted pairs with overall screen
• 795x connector plugs:
• 1/2" NPT to M20 x 1 Exd IIC-rated gland adaptor
• M20 x 1 Exd IIC-rated cable gland
• 1/2" NPT Exd IIC-rated blanking plug
• Hex drive, 2.5 mm AF (2.0 mm AF stainless steel enclosure)
• Electrical screwdriver, 3 mm drive
• Wire strippers
• Gland spanners / drives
For installations in hazardous areas:
• For ATEX installations, the electrical installation must strictly adhere to the safety information
given in the ATEX safety instructions booklet shipped with this manual. See Section 1.1 for
important information.
• For installations in USA and Canada, the electrical installation must strictly adhere to the Electrical
Codes and a conduit seal is required within 2” (50 mm) of the enclosure.
7950 7951 Klippon 7951 D-type (Cannon)
2 off 10-way 2 off 10-way 2 off 25-way
1 off 4-way 1 off 4-way 1 off 4-way