HI9146
Dissolved Oxygen Meter
Dissolved oxygen is a commonly measured parameter in
aquaculture, wastewater treatment, environmental studies, and wine analysis.
The HI9146 is a rugged, portable dissolved
oxygen (DO) meter
desi ned to provide high accuracy measurements whether
in the field or in the lab. The meter features automatic calibration performed
at one or two points in saturated air and/or zero oxygensolution.All readingsareautomatically
compensated for temperature variations and can be frozen on the display upon
stability using the auto-end feature. Salinity and altitudecompensation are user adjustable based on the environmental conditions that arepresent. The HI9146 features a Battery Error Prevention System (BEPS) thatdetects when the batteries become too weak to ensure reliable measurements. TheHI91 6 is supplied complete and ready to use.
Polarographic Measuring System
The meter and probe use polarographic sensor technologybased on the Ross and Clark polarographic measurement method. The probe iscomprised of a platinum cathode and silver anode in an electrolyte solutionheld in place over the surfaces of the electrodes by a polymer membrane. Anexternal voltage applied across the system establishes a current proportional tothe concentration of dissolved oxygen.
Replaceable Membrane Caps
The pretensioned thin polytetrafluoroethylene (PTFE)membranes employ a screw cap design that can be changed quickly by simplyfilling with the HI7041 electrolyte fill solution and screw on the DO probe.
Automatic Calibration
Calibration can be performed at one or two points to 100%and/or 0% saturation. The 100% saturation is done in air while the 0% is donewith the HI7040 bicomponent zero oxygen solution.
Good Laboratory Practice (GLP)
The Good Laboratory Practice feature allows the user torecall calibration information including date, time and calibrations points.
Automatic Temperature Compensation
All readings are automatically compensated for temperaturevariations with a high accuracy, built in linearized thermistor temperaturesensor behind a stainless steel cover.
Altitude Compensation
The HI9146 allows for altitude compensation for up to 4000meters with a 100 meter resolution.