Panametrics DigitalFlow XGF868i, Startup Manual

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Chapter 1. Installation
2 DigitalFlow™ XGF868i Startup Guide
1.3 Site Considerations
Because the relative location of the flowcell and the electronics enclosure is important, use the guidelines in this
section to plan the XGF868i installation.
1.3.1 Electronics Enclosure Location
The standard XGF868i electronics enclosure is a powder-coated, cast-aluminum, Type-7/4X explosion-proof
enclosure. An optional stainless steel enclosure is available. Typically, the enclosure is mounted as close as possible
to the transducers. When choosing a site, make sure the location permits easy access to the electronics enclosure
for programming, maintenance and service.
IMPORTANT: For compliance with the EU Low Voltage Directive (2006/95/EC), this unit requires an external power
disconnect device such as a switch or circuit breaker. The disconnect device must be marked as such,
clearly visible, directly accessible, and located within 1.8 m (6 ft) of the unit.
1.3.2 Flowcell Location
The pipeline flowcell consists of the flow rate transducers and any pressure and/or temperature transducers
employed as part of the flow measurement system. Ideally, choose a section of pipe with unlimited access to the
flowcell, such as a long stretch of pipe that is above ground. However, if the flowcell is to be mounted on an
underground pipe, dig a pit around the pipe to facilitate installation of the transducers.
1.3.3 Transducer Location
For a given fluid and pipe, the accuracy of the XGF868i depends primarily on the location and alignment of the
transducers. In addition to accessibility, when planning for transducer location, adhere to the following guidelines:
1. Locate the transducers so that there are at least 20 pipe diameters of straight, undisturbed flow upstream and
10 pipe diameters of straight, undisturbed flow downstream from the measurement point. To ensure undisturbed
flow, avoid sources of turbulence in the fluid such as valves, flanges, expansions, elbows and dips or low spots in
which condensed liquid may collect.
2. Because condensate or sediment at the bottom of the pipe may cause attenuation of the ultrasonic signal,
locate the transducers on the side of a horizontal pipe, when possible. If limited pipe access necessitates
top-mounted transducers and the sound beam path includes a reflection, shift the transducers to at least 10° off
top dead center. This will minimize the influence of any sediment on the reflected ultrasonic signals.
WARNING!
Before beginning installation, please refer to “Installing Panametrics Measurement
& Control Ultrasonic Flow Transmitters in a Potentially Hazardous Area” near the
back of this manual.