HANNA, HI 4421 Dissolved Oxygen Bench Meter

dissolved oxygen meter  HI 4421 is a single-channel, research-grade DO bench meter, with a backlit 240 x 320 dot-matrix color display and millesimal measuring resolution. Four viewing modes are available on the display screen, and include: basic information, GLP information, Graph and Log History. This is a professional meter with extensive capabilities in measuring and interpreting DO measurements as BOD, OUR and SOUR paradigms. Temperature and atmospheric pressure measurements are possible with this meter. The user may select automatic or custom standard DO calibration. There are three selectable logging modes: automatic logging - with an adjustable sampling period, Log-On-Demand ( manual logging) and AutoHold logging ( DO only) . During DO measurements, the auto-hold feature will freeze and display the current reading. HI 4421 will store up to 100 logging lots for automatic or manual modes, up to 200 OUR and SOUR reports and up to 200 BOD method information entries. The user may also choose online or offline graphing. And all data can be downloaded to a PC via RS232 or USB interface. Range DO 0.00 to 90.00 ppm; 0.0 to 600.0% saturation Resolution DO 0.01 ppm; 0.1% saturation Accuracy DO ± 1.5% of reading ± 1 digit Range Barometric Pressure 450 to 850 mmHg; 560 to 1133 mBar Resolution Barometric Pressure 0 to 45 ppt ( g/ L) Accuracy Barometric Pressure ± 3 mmHg within ± 15° C from the calibration point Measurement Modes Direct D.O.; BOD ( Biochemical Oxygen Demand) ; OUR ( Oxygen Uptake Rate) ; SOUR ( Specific Oxygen Uptake Rate) Range Salinity 0 to 45 ppt ( g/ L) Range Temperature -20.0 to 120° C; -4.0 to 248.0° F; 253.15 to 393.15 K Resolution Temperature 0.1° C; 0.1° F; 0.1 K Accuracy Temperature ± 0.2° C/ K; ± 0.4° F Temperature DO 0.0 to 50.0° C; 32.0 to 122.0° F; 237.1 to 323.1 K Calibration DO Automatic/ user standard, 1 or 2 points Probe Polarographic with built-in temperature sensor Calibration Check pH electrode and buffer condition Temperature Compensation pH Automatic or Manual from -20.0 to 120.0° C ( -4.0 to 248.0° F) Log-On-Demand Up to 100 lots 10000 samples/ lot for automatic logging; 5000 samples/ lot for manual logging; Logging interval: 1 to 300000 sec GLP Last Calibration Data/ Calibration Info Alarm ( DO, BOD, OUR, SOUR) Yes ( Inside/ Outside Limits) Auto Endpoint Yes PC Connection Opto-isolated USB and RS232 Display 240 x 320 dot matrix color LCD with on-screen help, graphing, language selection and custom configuration Power Supply 12 Vdc adapter ( included) Dimensions 159 x 230 x 93 mm ( 6.3 x 9.1 x 3.7" ) Weight 800 g ( 1.8 lb.) HI 7041S -- HI 7041 HI 4421 is supplied with power adapter, instruction manual, HI 76408 D.O. probe, HI 7040L zero oxygen solution ( 500 mL) , HI 7041S electrolyte solution ( 30 mL) , HI 76407A/ P membrane caps ( 2pcs) , HI 76404N electrode holder and quick reference card. * Add -01 to end of Product Code for 115V power adapter. Range DO 0.00 to 90.00 ppm; 0.0 to 600.0% saturation Resolution DO 0.01 ppm; 0.1% saturation Accuracy DO ± 1.5% of reading ± 1 digit Range Barometric Pressure 450 to 850 mmHg; 560 to 1133 mBar Resolution Barometric Pressure 0 to 45 ppt ( g/ L) Accuracy Barometric Pressure ± 3 mmHg within ± 15° C from the calibration point Measurement Modes Direct D.O.; BOD ( Biochemical Oxygen Demand) ; OUR ( Oxygen Uptake Rate) ; SOUR ( Specific Oxygen Uptake Rate) Range Salinity 0 to 45 ppt ( g/ L) Range Temperature -20.0 to 120° C; -4.0 to 248.0° F; 253.15 to 393.15 K Resolution Temperature 0.1° C; 0.1° F; 0.1 K Accuracy Temperature ± 0.2° C/ K; ± 0.4° F Temperature DO 0.0 to 50.0° C; 32.0 to 122.0° F; 237.1 to 323.1 K Calibration DO Automatic/ user standard, 1 or 2 points Probe Polarographic with built-in temperature sensor Calibration Check pH electrode and buffer condition Temperature Compensation pH Automatic or Manual from -20.0 to 120.0° C ( -4.0 to 248.0° F) Log-On-Demand Up to 100 lots 10000 samples/ lot for automatic logging; 5000 samples/ lot for manual logging; Logging interval: 1 to 300000 sec GLP Last Calibration Data/ Calibration Info Alarm ( DO, BOD, OUR, SOUR) Yes ( Inside/ Outside Limits) Auto Endpoint Yes PC Connection Opto-isolated USB and RS232 Display 240 x 320 dot matrix color LCD with on-screen help, graphing, language selection and custom configuration Power Supply 12 Vdc adapter ( included) Dimensions 159 x 230 x 93 mm ( 6.3 x 9.1 x 3.7" ) Weight 800 g ( 1.8 lb.)