Water Quality Measuring Instrument

Water Quality Measuring Instrument

  • Conductivity: 0.01 µS/cm to 200 µS/cm
  • DO: 0.01 to 20 mg/L (0 to 200%),mV: -1500 to 1500 mV
  • Salinity: 0 - 42 g/kg, TDS: 0.0 - 50.0 mg/L

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Designed for your water applications, the Hach HQ440d laboratory meter is an advanced meter that takes the guesswork out of measurements.

HQd™ meters connect with IntelliCAL™ probes that automatically recognize the testing parameter, calibration history, and method settings to minimize errors and setup time.

  • Flexible benchtop meter makes your lab testing of critical water quality parameters more efficient
  • Intuitive user interface for simple operation and accurate results
  • Trust your measurements - IntelliCAL™ smart probes store all calibrations in the probe
  • Enhance productivity with an ultra-bright screen and large font size for easy to read results
  • Convenient kit includes everything you need to start testing

Flexible benchtop meter makes your lab testing of critical water quality parameters more efficient

Two input channels for simultaneous measurement of pH, Conductivity, Dissolved Oxygen, BOD, ORP, Ammonia, Ammonium, Fluoride, Chloride, Sodium, and temperature - any IntelliCAL™ smart probe.

Intuitive user interface for simple operation and accurate results

Guided calibration and check standard routines reduce calibration errors while stabilization alerts and visual measurement lock ensure that you can trust the accuracy of the results.

Trust your measurements - IntelliCAL™ smart probes store all calibrations in the probe

Calibration history allows quick and easy change out of probes without re-calibrating. The HQd™ smart system records serial numbers, current calibration data, user ID, sample ID, time, and date automatically in the data log for complete GLP traceability..

Enhance productivity with an ultra-bright screen and large font size for easy to read results

Internal USB ports simplify data transfer, peripherals, and software updates and connection to PCs printer and keyboards. 

Convenient kit includes everything you need to start testing

Meter kit includes 4 AA batteries, power adapter, USB cable for data transfer, quick-start guide, user manual, and documentation CD

Automatic Buffer RecognitionColor-coded: 4.01, 7.00, 10.01 pH;
IUPAC: 1.679, 4.005, 7.000, 10.012, 12.45
DIN: 1.09, 4.65, 9323
User-defined custom buffer sets
BOD5/CBOD resolutionAvailable when integrated with Hach WIMS BOD Manager software
Cable resistance correctionDigital - not needed
Calibration curves displayCalibration summary data logged and displayed
Calibration Intervals/Alerts/Reminder2 hours to 7 days
ComplianceCE.WEEE
Conductivity Accuracy± 0.5 % % from (1µS/cm - 200 mS/cm)
Conductivity Measurement Range0.01 µS/cm to 200 µS/cm
Conductivity resolution5 digits with 2 digits after decimal point
Custom Calibration StandardsUser-defined standard sets
Data ExportDownload via USB connection to PC or flash stick.
Automatically transfer entire data log or as readings are taken.
Data Memory500 results
Data StorageGLP/ISO compliant reading data stored with calibration details.
Calibration details and check standard readings documented as events in data log. Automatically store in press to read mode and interval measurement mode. Manually store in continous read mode.
Digital (intelligent) electrode inputs2 channel
Dimensions (H x W x D)3.5 in x 6.8 in x 9.2 in (89 mm x 173 mm x 234 mm)
DisplayDisplay readings from one or two probes
Simultaneous readings from two probes (HQ440d only)
pH: pH, mV, temperature
Conductivity: Conductivity, TDS, salinity, resistivity, temperature
LDO: dissolved oxygen, pressure, temperature
LBOD: dissolved oxygen, pressure, temperature
ORP/Redox: mV, temperature
Sodium: Sodium, mV, temperature
Display Lock FunctionContinuous measurement or press to read mode available with averaging
function for LDO measurement.
Display Type240 x 160 pixel Display readings from one or two probes
Simultaneous readings from two probes
pH: pH, mV, temperature
Conductivity: Conductivity, TDS, salinity, resistivity, temperature
LDO: dissolved oxygen, pressure, temperature
ORP/Redox: mV, temperature
Sodium: Sodium, mV, temperature
DO Measurement Range0.01 to 20 mg/L (0 to 200%)
DO Resolution0.01 mg/L
Fixed Buffer SelectionIUPAC standards
(DIN 19266) or Technical buffer (DIN 19267) or 4-7-10 series or user defined
InputsM12 digital (1) for IntelliCAL probes
Interface Languages13**
Internal Data Storage500
IP Rating:IP54
ISE Direct Measurement RangeYes
ISE Electrode CalibrationElectrode specific - see electrode user instructions
LanguagesEnglish, French, German, Italian, Spanish, Danish, Dutch, Polish, Portuguese, Turkish, Sweedsh, Czech, Russian
mV Accuracy± 0.1 mV
mV Measurement at Stable Reading5 stabilization settings
mV Measurement Range-1500 to 1500 mV
mV Resolution0.1 mV
Operating Error MessagesFull text messages
Operating Humidity90 % relative humidity (non-condensing)
Operating InterfaceKeypad
Operating Temperature0 to 60 °C
ORP Electrode CalibrationPredefined ORP standards (including Zobell's solution)
OutputsUSB to PC / flash stick
PC Data Transfer Softwareincluded
pH Measurement at stable reading5 stabilization settings
Power Requirements (Voltage)6 V
PrinterOptional accessory
Salinity Measurement Range0 - 42 g/kg
Salinity Resolution0.01 ppt
TDS Measurement Range0.0 - 50.0 mg/L
Temperature Accuracy0.3 °C
Temperature CompensationOff, automatic, and manual (auto correction is parameter dependent)
Temperature Resolution0.1 °C
Warranty3 years
Water ResisitanceIP67 (1m Submersion for 30 minutes)
Weight0.74 lbs. (0.335 kg)