New Moisture analyser

Feb 2000 Analytical Instrumentation & Environmental Monitoring

Ametek has introduced the Model 2850, a new moisture analyser particularly suited for monitoring process desiccant dryers, instrument air dryers, or air separators, as well as for industrial gas production and quality assurance.

The Model 2850 reaches 63% of a steady state reading in less than 5 minutes, and by using the unique non-equilibrium measurement techniques, ultimate response speed drying-down as well as wetting-up are achieved.

The analyser provides ±5% accuracy from 1 to 100 ppmv and indicates to 1000 ppmv. Between 100 ppbv and 1 ppmv the measurement is good for a sensitive trend indicator. Two customer settable 4 to 20 mA analog outputs are provided to cover any portion of the operating range.

An internal NIST-traceable moisture generator is employed which adds a known amount of moisture to conditioned sample gas. The resulting wet gas is then directed to the analyser's sensor to verify proper sensor and system operation. Few interference problems occur, as the analyser is specific to water for most applications. Hydrogen and oxygen do not interfere nor do unsaturated hydrocarbons or methanol.

Data is transferred via an RS485 digital interface and the two fully programmable 4 to 20 mA analog outputs. Multiple, fully programmable alarms and alerts allow the user to alarm on a menu process and analyser performance conditions. The RS485, when used with the optional Ametalk software, is particularly useful for remotely monitoring or troubleshooting an unattended Model 2850.

OEN Enterprises

(011) 792 2859

mike@oenenterprises.co.za

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