Micro Motion® 3098 Gas Specific Gravity Meter Installation and Configuration Manual

PublishTime：2022-04-29

●The 3098 specific gravity meter consists of a vibrating cylinder gas density meter surrounded by a gas reference chamber, which helps to achieve good thermal equilibrium. The gas reference chamber has a fixed volume that is initially pressurized with the actual line gas. It is then sealed by closing the reference chamber filling valve, thus retaining a fixed measure and quantity of gas, now known as the reference gas.
●Note: Once the chamber has been filled, do not open the reference chamber filling valve again.
●The sample gas enters the instrument at the enclosure side and passes through a filter, followed by a pressure-reducing orifice. The sample gas is then fed through input pipework so that it enters the gas density meter at the equilibrium temperature of the unit. The gas then flows down to a pressure control valve chamber.
●The pressure of the reference gas acts on the separator diaphragm and forces the line gas pressure to rise until the pressures on both sides are equal, thus the gas pressures within the gas density meter and the reference chamber are equal.
●As the ambient temperature changes, the pressure of the fixed volume of reference gas will change as defined by the Gas Laws. This change in pressure will affect the sample gas pressure within the gas density meter such that the temperature and pressure changes are self-compensating.
●If the sample gas pressure rises above that of the reference chamber pressure, the pressure control valve opens to vent the excess gas via an outlet orifice in the enclosure side, so that the sample gas pressure is reduced to equal the reference gas pressure. For gas to flow it is necessary that the supply pressure is greater than the reference pressure, which in turn must be greater than the vent pressure. (Typically the line pressure must be between 15% and 25% above that of the reference chamber pressure).
●A pressure gauge is fitted in order to monitor the pressure within the gas density meter. This is desirable when charging the reference chamber and also for general maintenance.
●Electrical connections to the 3098 specific gravity meter are taken through the cable gland in the enclosure side and then into the density meter’s electronics housing.
●When the enclosure is sealed, the complete instrument is insulated so that rapid changes in ambient temperature will not upset the temperature equilibrium of the unit and produce thermal shock errors.

Brand of Product：	EMERSON
Part#：	3098 More Part#
Product Category：	Gas Specific Gravity Meter 、 specific gravity meter More
Application：	More
Data Type：	User's Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	August 2012
Version Number：	Rev. AB
Data Encoding：	MMI-20014120
Data Size：	3.5 MB

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