Ionics Instruments 2004 Page 3-3 DLM 30007-08 Rev. A
Sample Inlet Systems and Sample Pump
On-Line Sampling from Pressurized Source
Water from a high-pressure line (> 5 psig) is introduced into the analyzer using
a sample inlet system. The system consists of:
• two lengths of 1/4" OD PFA tubing
• a 60-µm stainless steel in-line filter
• an in-line pressure regulator
• a sample interface box that includes:
• a pressure gauge
• back-pressure orifice
• a sample inlet line to the analyzer
• a sample outlet.
The temperature of the water to the inlet system can range from 1-100° C.
The flow rate of water through the inlet system can range from 30-220
mL/minute. The in-line pressure regulator reduces the pressure of the water
to 3-7 psig (5 psig at 25 °C). Water is drawn into the analyzer by a sample
pump at a flow rate of approximately 0.35 mL/min. A pressure > 5 psig will be
indicated by the gauge for water samples at temperatures < 25 °C (lower
pressure for water > 25 °C). The inlet system can also be used for water
samples at pressures below 5 psig as long as the flow through the inlet system
is at least 30 mL/min. For most applications, the waste stream from the
analyzer is mixed with the effluent from the sample inlet system and
discharged to a drain.
Grab Sampling
The analyzer can also be used to sample directly from a sample bottle or other
non-pressurized container for the analysis of grab samples, standards, and
other off-line operations. The samples should be filtered (60 µm or finer) to
prevent clogging of the analyzer by particles in the sample. The inlet line from
the sample inlet system is a 1/16" OD Teflon
tubing and the sample pump
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