Process Analysis Systems & Total Solutions for Continuous Water & Wastewater Analysis


900MAX Portable Compact Sampler


Sampling for regulatory compliance, monitoring or combined sewer overflows, storm water outfalls, and water quality research may demand a sampler with greater sophistication and capability. If so, then the Sigma 900MAX Sampler is what you need.

The 900MAX, in addition to sampling, also monitors flow, plus key parameters including pH, temperature, oxygen reduction potential, dissolved oxygen and/or conductivity. Should any parameter exceed user-defined limits, a sample may be immediately collected. And the MAX even delivers any out-of- limits sample to one or more designated Trouble Bottles. This helps you quickly determine the problem source.

Durable, Heavy-duty Construction

Molded ABS exterior withstands harsh environments

Double-walled insulated base keeps samples cool

Unique Constant Time/Variable Volume Sampling

The Sigma 900MAX´s unique Constant Time/Variable Volume feature varies sample size in proportion to flow rate, capturing flow-weighted samples on the first try. This new patented* method closely simulates manual grab sampling. Conventional samplers vary the intervals between samples in relation to the flow rate, while sample sizes remain constant. During low flow periods, sample intervals can increase dramatically, producing insufficient sample volumes for proper analysis. High flows cause sample containers to fill before the desired sample period ends. These conditions make capturing short-lived illicit discharges or significant storm events difficult. The Sigma 900MAX Constant Time/Variable Volume feature takes regularly timed samples, adjusting the sample size proportionally to the flow rate. The sample volume increases and decreases with the flow, ensuring that proportional samples are taken at even intervals throughout the sampling period.

* Constant Time, Variable Volume patent #5587926, Refrigerated fluid sampling apparatus and method with variable volume sampling system.

The Sigma 900MAX Monitors & Manages

For a full-fledged water management tool, nothing compares to the Sigma 900MAX Controller. This highly advanced sampler features a large 8-line x 40-character backlit display that allows you to quickly select information from an easy menu-type programming format. And with 12 datalogging channels, the Sigma 900MAX can be much more than a sampler. Its multitasking ability allows monitoring of rainfall, level, flow, velocity, temperature and pH or ORP.

You can also log up to three external analog signals. The Sigma 900MAX records as many as 116,000 readings on one or any combination of the 12 channels. RAM memory is automatically allocated as necessary during operation - either as wrap-around (drops off the oldest data) or slate (stops storing new data). Flash memory allows you to install software enhancements (available on the Internet) easily, without returning the sampler to the factory, so you will always have the latest monitoring technology.

Compact base model is specifically designed for use in 18 in. manholes

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