Polarographic Measuring System - The oxygen meter and probe use polarographic sensor technology based on the Ross and Clark polarographic measurement method. The probe is comprised of a platinum cathode and silver anode in an electrolyte solution held in place over the surfaces of the electrodes by a polymer membrane. An external voltage applied across the system establishes a current proportional to the concentration of dissolved oxygen.

 

Replaceable Membrane Caps - The pretensioned thin polytetrafluoroethylene (PTFE) membranes employ a screw cap design that can be changed quickly by simply filling 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 done with the HI7040 bicomponent zero oxygen solution.

 

Good Laboratory Practice (GLP) - The Good Laboratory Practice feature allows the user to recall calibration information including date, time and calibrations points.

 

Automatic Temperature Compensation - All readings are automatically compensated for temperature variations with a high accuracy, built-in linearized thermistor temperature sensor behind a stainless steel cover.

 

Altitude Compensation - The HI9146 allows for altitude compensation for up to 4000 meters with a 100-meter resolution.

 

Salinity Compensation - Salinity compensation is adjustable from 0 to 80 g/L (ppt) with a 1 g/L resolution for the measurement of DO in brackish and sea water.

 

Auto End Point - The HI9146 features an auto endpoint mode in which, when selected, the reading will freeze on the display once a stable measurement is obtained. The auto-end feature allows for consistency among various users by ensuring that stability has been achieved before recording a measurement.

 

Backlit LCD - The HI9146 dissolved oxygen meter has a display with a backlight for easy viewing of readings in poor lighting conditions.

 

Battery Error Prevention System (BEPS) - The Battery Error Prevention System detects when the batteries become too weak to ensure reliable measurements. The backlight feature is automatically disabled when batteries are getting low and a clear indication is displayed to warn the user of this condition.

Specifications

SKU	HI9146-web
Product Name	Portable Dissolved Oxygen Meter - HI9146
Quote Required	Yes
Dissolved Oxygen Range	0.00 to 45.00 ppm (mg/L), 0.0 up to 300.0% saturation
Dissolved Oxygen Resolution	0.01 ppm (mg/L); 0.1% saturation
Dissolved Oxygen Accuracy	±1.5% F.S. or ±1 digit, whichever is greater
Dissolved Oxygen Calibration	one or two points at 0% (HI 7040 solution) and 100% (in air)
Dissolved Oxygen Temperature Compensation	automatic from 0 to 50°C (32 to 122°F)
Salinity Compensation	0 to 80 g/L (ppt) (resolution 1 g/L)
Altitude Compensation	0 to 4000 m (resolution 100 m)
Temperature Range	0.0 to 50.0°C / 32.0 to 122.0°F
Temperature Resolution	0.1°C / 0.1°F
Temperature Accuracy	±0.2°C; ±0.4°F (excluding probe error)
DO Probe	HI76407 DO probe (included)
Battery Type/Life	1.5V AAA (3) /approximately 200 hours of continuous use without backlight (50 hours with backlight on)
Environment	0 to 50°C (32 to 122°F); RH max 95%
Dimensions	185 x 72 x 36 mm (7.3 x 2.8 x 1.4”)
Weight	300 g (10.6 oz.)
Ordering Information	HI9146 is supplied complete with HI76407 DO probe, HI76407A pre-formed PTFE DO membranes (2), HI7041S electrolyte solution (30 mL), batteries, instructions and rugged carrying case.