Portable Dissolved Oxygen Meter - HI9142 DO Meter Portable Hanna Inst

Features at a Glance Replaceable Membrane Caps - The pretensioned polytetrafluoroethylene (PTFE) membranes employ a screw cap design for simple filling of electrolyte and easy replacement on the probe. Polarographic Measuring System - The 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. One or Two Point Calibration - Calibration for the HI9142 is performed as a manual calibration at 100% and automatic calibration in zero oxygen solution. Automatic Temperature Compensation - The HI9142 compensates for changes in the solubility of oxygen in water and for the permeability of the polymer membrane from temperature effects. All readings are automatically compensated for temperature variations with a high-accuracy, built-in linearized thermistor temperature sensor behind a stainless steel cover. Oxygen, Dissolved Measurement Type polarographic Oxygen, Dissolved Range 0.0 to 19.9 mg/L (ppm) Oxygen, Dissolved Resolution 0.1 mg/L (ppm) Oxygen, Dissolved Accuracy ±1.5% F.S. Oxygen, Dissolved Calibration manual in 100%; automatic in 0% DO Oxygen, Dissolved Temperature Compensation automatic, 0 to 50°C (32 to 122°F) Temperature Range -5.0 to 50.0°C (23.0 to 122.0°F) Temperature Resolution 0.1°C (1°F) Temperature Accuracy ±0.2°C (±1°F) (excluding probe error) DO Probe HI 76407 with 4 m (13 #39;) cable (included) Automatic Shut-Off After approx. 8 minutes Battery Type/Life 1.5V AA (4) / approx. 500 hours of use Environment 0 to 50°C (32 to 122°F); RH max 100% Dimensions 196 x 80 x 60 mm (7.7 x 3.1 x 2.4 #34;) Weight 500 g (1.1 lb.)