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Installation and Configuration Manual 5
Installation (Short Stem) Electrical ConnectionsInstallation (Long Stem)Introduction
Chapter 2
Installation (Short Stem)
For information on installing a long-stem version of the 7827 digital viscosity meter, see Chapter 3.
2.1 Introduction
There are a variety of external factors that affect the ability of the 7827 digital viscosity meter to
operate successfully. In order to ensure that your system works correctly, the effects of these factors
must be taken into consideration when designing your installation.
There are two main aspects to consider:
• The accuracy and repeatability of the measurements
• The relevance of the measurements to the overall purpose of the system
Factors which may adversely affect accuracy and repeatability include:
• The presence of gas or bubbles within the fluid being measured
• Non-uniformity of the fluid
• The presence of solids as contaminants
• Fouling of the meter
• Temperature gradients
• Cavitations and swirls
• Operating at temperatures below the wax point of crude oils
• The correct pipe diameter that corresponds to the calibration of the meter.
In some applications, absolute accuracy is less important than repeatability. For example, in a system
where the control parameters are initially adjusted for optimum performance, and thereafter only
checked periodically.
The term achievable accuracy can be used to describe a measure of the product quality that can be
realistically obtained from a process system. It is a function of measurement accuracy, stability and
system response. High accuracy alone is no guarantee of good product quality if the response time of
the system is measured in tens of minutes, or if the measurement bears little relevance to the operation
of the system. Similarly, systems which require constant calibration and maintenance cannot achieve
good achievable accuracy.
All drawings and dimensions given in this manual are given here for planning purposes only. Before
commencing fabrication, reference should always be made to the current issue of the appropriate
drawings. Contact Micro Motion for details.
For further information on handling and using the meter, see “Safety guidelines” on page 1