HEATH COMPANY

CIRCLE 78 ON READER SERVICE CARD. Precise moisture calibration standards from high-pressure gas cylinders have been developed. Key to the new sys...
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HIGH PHtsSURE REC-U'-ATOR

Β* pass FLOWMETER /

MNE MLItRINO VALVE

MOISTURE MIXTURF TO USE POINT S.S.LINE PREFERABLY HEATED

"PRECURSER UNIT

GAS MIXTURE CYLINDLh

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HEATH COMPANY, Dept 520-01 Benton Harbor, Michigan 49022

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•Mail order prices; FOB factory. Prices & specifications subject to change without notice. EK-302 CIRCLE 7 8 O N READER SERVICE CARD

106 A • ANALYTICAL CHEMISTRY, VOL. 43, NO. 6, MAY 1971

Precise moisture calibration standards from high-pressure gas cylinders have been developed. Key to the new sys­ tem is a device called a Precursor which operates in conjunction with spe­ cially prepared cylinder gas mixtures. A calibration standard with a mix range from 5 to 6000 ppm of water with an accuracy of ± 5 % of moisture can be delivered. Cylinder gases (any one or a combination of inert gases) used to prepare the mixtures contain less than 1 ppm of water (—105°F dew point). The Precursor fits in-line between the gas cylinder and use point. Outlet flow rate can range from 0.2 to 1 standard fts per hr. The system should be useful in laboratories for standardizing moisture detection equipment. The Precursor alone costs more than $250. Air Products and Chemicals, Inc. 215395-4911 505

NBS New Standards Twelve new standards have recently been made available by the National Bureau of Standards. They are: SRM 485, austenite in ferrite ; SRM 493, iron carbide in ferrite; SRM 720, synthetic sapphire; SRM 723, tris(hydroxymethyl) aminomethane (2 - amino -2 - hydroxymethyl-l,3-propanediol) ; SRM 917, D-glucose; SRM's 1206-2, 1207-1, 1207-2, 1208-1, and 1208-2, high-tem­ perature alloys; and two microanalysis standards: SRM 2141, urea; and SRM 2142, o-bromobenzoic acid. For a complete list of Standard Ref­ erence Materials, NBS Special Publica­ tion 260 is for sale by the Supt. of Documents, U. S. Government Printing Office, Washington, D. C. 20402, for 75