Flow Solution FS3700

Continuous Flow Analyzer

Model: FS3700

Manufacturer: OI Analytical

The FS3700 Continuous Flow Analyzer offers efficiency and flexibility, with the reproducibility and precision you need. A continuous flow analyzer that performs flow-injection analysis (FIA) and segmented flow analysis (SFA) simultaneously!



The FS3700 is a multiparameter benchtop instrument that measures several critical parameters like ammonia, nitrate, nitrite, phosphorous and silica, TKN, and more.

The unit comes standard with two detector boards, each capable of supporting photometric, amperometric, ion-selective electrodes, and third-party detectors out of the box. This provides flexibility to tailor methodology for research or quality control processes.

Flexible and Modular Continuous Flow AnalysisFlexible and Modular Design

The unique, modular design of the FS 3700 gives the system superior flexibility. Different flow methods, including SFA (segmented flow analysis), FIA (flow injection analysis), iSFA, and SFIA can be run on different channels on the system simultaneously.

A variety of pre-configured chemistry cartridges and industry-leading detectors can be utilized with plug-and-play ease. Multiple systems can be linked to provide additional channels of concurrent analysis.

Methods for aqueous samples, soil or plant extracts are available to support environmental compliance monitoring, process optimization and research applications. Validated Methods

OI Analytical validates the hardware configuration and performance of every method supplied with the FS3700 analyzer, providing users a total analysis solution.  The instrument utilizes interchangeable, pre-assembled chemistry cartridges for maximum versatility and ease of use. Methods for aqueous samples, soil, or plant extracts are available to support environmental compliance monitoring, process optimization, and research applications.

The FS3700 features an open benchtop layout, and intuitive software platform, and a USB port for data retrieval and exporting purposes.Easy Data Retrieval and Exportation

The FS3700 features an open benchtop layout, an intuitive software platform, and a USB port for data retrieval and exporting purposes, making FS3700 the easiest to use and most cost-effective way to measure the following chemistries in a wide range of application areas:

  • Nitrate and Nitrite in Milk
  • Ammonia Nitrogen
  • Available Cyanide
  • Low-Level Phosphorus
  • Silica
  • Total Dissolved Nitrogen
  • Sulfate
  • Phosphorus – All Forms
FS 3700 Specifications
Analysis Module 1 or 2 chemical analysis channels per chassis
Analysis Module Dimensions 31 in. W x 17.5 in. D x 10.5 in. H
78.74 cm W x 44.45 cm D x 26.67 cm H
FS 3700 Dimensions with 180-position Autosampler Approximately 45 in. (114.3 cm) W
FS 3700 Dimensions with 360-position Autosampler Approximately 51.5 in. (131 cm) W
Injection Valve 8 or 10-port switching valve with chemically-inert wetted surfaces
Photometric Detector 420-880 nm, with PEEK path lengths of 5-, 10- or 20-mm
Amperometric Detector Silver working electrode
silver/silver chloride reference
stainless steel counter electrode
In-line Heater Included as needed, mounted underneath chemistry cartridge
user programmable in 1 ̊C increments
UV-digestion Module Included as needed, mounted underneath chemistry cartridge
Peristaltic Pump 24-channel, fits on top of analysis module
Autosampler 180-position, X-Y-Z (180 samples + 10 standards)
360-position, X-Y-Z (360 samples + 10 standards)
Tubing FEP Teflon® and EVA ethylene-vinyl acetate copolymer
Manifolds / Fittings Polysulfone
Analysis Methods / Documentation Validated chemistries for specific analytes / sample matrices with performance data
Operating Software FlowView
Operating System Windows® 7, Windows® 8, 8.1 and 10
Data Collection 6 channels per instance of software
Multiple instances of software can be run on a single computer
PC to FS 3700 Communications USB
Power Supply 24VDC universal switching power supply for operation with 90-250VAC 50/60Hz source
Power Requirements 110VAC/60 Hz or 230VAC/50 Hz
Weight (Analysis Module) 19.5 kg (43 lbs.), typical for analysis module and pump, two injection valves, chemistry cartridges, detector modules
Certifications CE Safety EN 61010-1
EMC Immunity & Emissions EN 61326-1:2006

Xylem Cyanide Guide


FS3700 Brochure | 4072 - 03


FS3700 Methods List


Xylem Lab Food & Safety Brochure


Nutrient Pollution Analysis Brochure


Lab Wastewater Analysis Brochure


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