CM515 and HME900 Density Converter

Features

• High accuracy calculations

• Choice of field or control room installation

• Flexible input into user DCS

• Extensive range of standard calculations

• Customer defined function (CDF) for non-standard calculation

Two Thermo Scientific density converter options are available that work in combination with Thermo Scientific liquid and gas density meters to ensure the optimum processing solution for the selected application. The Thermo Scientific HME900 head-mounted electronics option gives the user the power of control room electronics in the field with full HART compatibility. For applications requiring greater input/output flexibility or where the electronics are control room based, users may prefer the Thermo Scientific CM515 density converter.

The density converters accept the frequency and PT100 (RTD) temperature outputs from the density meter, together with a pressure input (if required), and calculate a selection of density and density derived parameters such as live density, specific gravity, molecular weight, °Brix, °Baume, °API, and gas compressibility (depending on fluid type). The customer defined function (CDF) facility allows non-standard calculations to be performed, such as percent concentration, percent solids, percent alcohol and percent fat using a look-up table derived from customer supplied data.

Thermo Scientific HME900

The HME900 head-mounted density converter option may be included with any Thermo Scientific liquid or gas density meter or specific gravity analyzer. The head-mounted electronics unit conditions the output signal to give a HART compatible 4-20 mA signal that can be used for indication or can be connected directly to the user’s DCS. Alternatively, the output can be read digitally by a HART compatible control or data collection system. The local display allows thenprocess engineer to view the prime variable value either in engineering units alone or with an alternating display of percent of chosen span.

The selection of HME900 electronics is ideal in most general density measure-ment applications and is essential when HART communications are required. The Thermo Scientific density meter HME900 system is certified for use in flammable atmospheres.

HME900 Ordering Information

The HME900 head-mounted electronics unit may only be specified as part of a Thermo Scientific density meter or specific gravity analyzer order by selecting the SIGNAL OUTPUT/‘H’ option. It is also possible to select the WinHME900 communications software and modem package by selecting the OPTIONS/‘W’ option.

HME900 Features

• Available on Thermo Scientific density meters/SG analyzers

• Field mounted, direct density output

• Gas density conversion based on general gas equations of state (Redlich-Kwong)

• Liquid calculation using ASTM D1250 (1980) for refined fluids and crude oils

• High accuracy calculations

• Local display

• HART compatible

• Hazardous area approvals

• WinHME900 PC configuration program

• Device description (DD) available for Emerson 375 field communicator