Automatic water sampling

The Hach Sigma SD900 sampler controller produces reliable sampling results without time-consuming maintenance.

With intuitive icons and scrolling menus, users can set up programs easily, typically in less than two minutes. The large colour-coded keys accommodate gloved hands and the large, five-line, transflective LED backlit display stays readable in bright or subdued light.

In addition, pump down time and maintenance are held to a minimum while maximising reliable results. The desiccant tube - mounted on the side of the controller - and the pump tubing are readily accessible and can be changed in minutes.

The Sigma SD900 samplers use a strong pump draw and spring-loaded rollers to ensure that large particulates will not interfere with sample collection. The positive displacement peristaltic pump induces flow by squeezing a flexible 3/8" tube, while spring-loaded rollers reduce pump tubing wear to prevent jams. The samplers can be programmed for time-based, flow-based, composite and multiple bottle sampling set-ups. Up to three separate sampling programs can be stored simultaneously.

With a tough, moulded ABS/PC exterior, the sampler controller is tightly sealed to withstand humidity and hostile, corrosive environments. The keypad, switches and display are covered by a waterproof, corrosion-resistant polyester membrane. The sealed connectors and pump shaft seal further ensure the unit's environmental integrity.

Data management and manual record keeping are simplified with the SampleView software which allows the user to view and download sample history to a computer, save templates, upgrade firmware in the field and download event logs.

The controller is available on portable compact, portable standard, indoor refrigerated and all-weather refrigerated bases to accommodate a wide variety of sampling environments and applications.