EPA Recommends Approval of In-Situ RDO Optical DO Methods

The U.S. EPA has granted nationwide approval to three In-Situ^® RDO^® optical DO methods under the Alternate Test Procedure (ATP) process. Use the TROLL^® 9500 instrument for stormwater and discharge monitoring Learn more ...

The TROLL^® 9500 Water Quality Instrument can be customized to suit your application.

Fully loaded, the TROLL 9500 Instrument measures pH, ORP, optical dissolved oxygen, conductivity, turbidity, pressure, and an ISE parameter. All instruments ship with a temperature sensor and barometric sensor.

When ordering, consider the following questions:

• Do I need logging, or will I be saving data directly to a RuggedReader^® Handheld PC?
• Do I need a narrow diameter (less than 2 inches) sonde, or will a 4-inch diameter sonde be acceptable?
• Do I need pressure and/or turbidity? At what depths will my instrument be deployed?
• What other parameters do I need to measure? pH, pH/ORP, high-range conductivity, low-range conductivity, ISE (ammonia, nitrate, or chloride) parameters are available.
• Do I need to send data via SDI-12? (RS485 is native, an SDI-12 adapter is available.)

TROLL Shield Antifouling System

Protect your investment and extend deployments by up to 6 weeks with the TROLL^® Shield Guard. Use the guard in coastal environments and at high-fouling sites.

Sensor Configurations

RDO Direct-Connect Sensor for sub-2 inch instrument

RDO Cable-Connect Sensor for sub-4 inch instrument