30 of 220 Instrument Installation - Anatel A643a
RPS - June 2007 - Edition 12
Operator Manual Anatel
2.3.2.1 Isolation Valve
Anatel A643a Analyzers should be connected to the sample supply through an upstream
isolation valve in order to allow manual control of the input flow. The isolation valve must be
supplied by the customer. Hach Ultra provides a 1/4” tube x 1/4” MNPT stainless steel
compression fitting that can be inserted in the valve to assist in connection to the Analyzer.
2.3.2.2 Water I/O Tubing
A length of 1/4” PFA (perfluoroalkoxy resin) sample tubing and a length of 1/8” OD
polypropylene drain tubing are supplied with each Anatel A643a Analyzer. The suitability of any
sample tube to the sample temperature and pressure should be determined prior to plumbing
the instrument. The PFA tubing provided is not recommended for installations where:
• The water temperature exceeds 75 °C (167 °F) and the pressure exceeds 90 psig
(620 kPa).
• The water temperature exceeds 85 °C (185 °F) and the pressure exceeds 80 psig
(550 kPa).
• The water temperature exceeds 90 °C (194 °F) and pressure exceeds 70 psig
(480 kPa).
Fig 2-20 : High-Purity Water System
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