ASTI - Model AST-DO-UNIVERSAL -Rugged Industrial Dissolved Oxygen Smart Digital RS-485 MODBUS RTU Sensor

The HiQDT smart digital sensors have integral industry standard RS-485 MODBUS RTU communications allowing them to be connected directly with a very wide array of devices thus ushering in a new era in industrial field measurement where the brand of data acquisition and control device is altogether decoupled from the manufacturer of the smart digital sensor giving true freedom of choice back to the customer to select their preferred vendors for each aspect of the continuous liquid analytical electrochemical analysis without any artificial restrictions.

• Thick-wall TEFLON membrane ensures very high stability, low-drift and high durability in aggressive industrial applications & minimizes frequency of membrane replacement
• No special maintenance needed. Just wipe the membrane periodically as required
• Galvanic dissolved oxygen cell with true zero means only slope (span) calibration is performed dry in air. No wet solution calibration is ever needed to simple field operation
• Membrane is easy to replace and electrolyte solution is simple to recharge allowing for extremely low ongoing cost of ownership and a theoretically unlimited service lifetime
• The AST-DO-UNIVERSAL D.O. sensor is not sensitive to presence of hydrogen sulfide gas
• Temperature compensation is built-in & performed automatically to ensure reliable readings

• Inline Insertion depth from 1.5 inches (standard) to 3.5 inches (special order option)
• Ready for inline or immersion use standard, submersible with waterproofing option
• Waterproofing seal option is available for complete cable isolation for fully submersible installations & applications employing field washdowns and/or moist & humid conditions
• Integral Pt1000 temperature element used to compute the percent (%) saturation values

• Integral Smart Digital MODBUS RTU digital sensor board for low-noise operation and long cable runs as well as portability of field calibrations and configurations for plug & play hot-swap
• Fully automated calibration including corrections for air pressure and ambient temperature
• Percent (%) Saturation computed with corrections for temperature, air pressure and salinity.
• Special Calibration Percent (%) Saturation excludes salinity correction for dry in air condition
• Waterproof & Corrosion-Resistant NEMA 6P Quick Disconnect HiQ4M Snap Connector
• Up to 1,000 meters (3,280 feet) total cable length using HiQ4F/HiQ4M snap extensions
• Smart Digital HiQDT MODBUS RTU configuration has 6 meters (20 feet) of cable standard, Max integral cable length 23 meters (75 feet) cable (longer lengths possible as special orders)
• Fully submersible up to max 15 meters (50 feet) without use of an immersion rod (standpipe)
• Min and Max temp in use plus time since last calibration analytics stored. The total time in use, sensor item number, sensor serial number including year and month of manufacture also stored integral to sensor to support remote troubleshooting with all data portable inside sensor.
• Modbus implementation guide gives details for programming PLC or data acquisition device