CDC PHC LDO MTC series Electrodes/Sensors

Summary

Product Identification

The Hach HQD series instruments are digital electrochemistry meters designed for measuring pH, conductivity, and dissolved oxygen (O₂). The system utilizes INTELLICAL digital electrodes which store calibration data within the electrode itself. Available models include:

• HQ 11D: For pH measurements.
• HQ 14D: For conductivity measurements.
• HQ 30D Flexi: A 1-channel instrument for pH, conductivity, and O₂.
• HQ 40D Multi: A 2-channel instrument for pH, conductivity, O₂, and Ion Selective Electrodes (ISE).

Operating Limits

Dissolved Oxygen (LDO)

• Range: 0.00 – 20.0 mg/l; 0 – 200 %
• Resolution: 0.01 or 0.1 mg/l; 0.1 % saturation
• Accuracy: ±1 % of the measuring range
• Air pressure compensation: Automatic

pH

• Range: 0–14
• Resolution (selectable): 0.1 / 0.01 / 0.001
• Accuracy: ±0.002
• Temperature compensation: Automatic

ORP (Oxidation Reduction Potential)

• Range: ±1500 mV
• Resolution: 0.1 mV
• Accuracy: ±0.1 mV

Ion concentration (ISE)

• Range: Depends on the ISE electrode
• Resolution (selectable): Max. 5 places; 0.1 / 0.01 / 0.001
• Accuracy: ±0.1 mV

Temperature

• Range: -10 to +110 °C
• Resolution: 0.1 °C
• Accuracy: ±0.3 °C

Conductivity

• Range: 0.01 µS /cm – 200 mS /cm (HQ 14D) or 0.01 µS /cm – 400 mS /cm (HQ 30D, HQ 40D)
• Resolution: Max. 5 places, 2 decimal places, if possible
• Accuracy: ±0.5 % (1 µS /cm – 200 mS/cm for HQ 14D) or ±0.5 % (1µS /cm – 400 mS / cm for HQ 30D, HQ 40D)
• Temperature compensation: Non-linear (natural water in conformity with DIN 38404 and EN ISO 7888), non-linear (NaCl), linear coefficient [numeric value] % / °C, no compensation.

Resistivity

• Range: 2.5 Ω cm – 49 MΩ cm
• Resolution: Max. 5 figures
• Accuracy: ±0.5 %

TDS (Total Dissolved Solids)

• Range: 0.0 – 50,000 mg/l
• Resolution: Max. 3 figures
• Accuracy: ±0.5 in the measuring range

Salinity

• Range: 0 - 42 (g/kg, ‰, no unit)
• Resolution: Up to 0.01 ppt
• Accuracy: ±0.1 mg/l at < 8 mg/l

Features

• Autoread: Supported on all models.
• Autocal: Automatic buffer recognition for pH.
• Calibration:
  • pH: IUPAC (1.679; 4.005; 7.000; 10.012) and DIN (1.09; 4.65; 9.23) standards, colour coded (4, 7, 10). Max. 4 calibration points.
  • Conductivity: Demal (1 D; 0.1 D; 0.01 D), Molar (0.1 M; 0.01 M; 0.001 M), NaCl (0.05 %; 25 µS /cm; 1000 µS /cm; 18 mS /cm). User defined; standard sea water. 1 calibration point.
  • O₂: 1 calibration point.
• Sensor Status Indicator: Supported on all models.
• Interfaces: Waterproof USB port for printer, PC, keyboard and USB stick.
• Password Protection: Supported on all models.
• Data Management: Basic, detailed, total (GLP).
• Data Memory: 500 readings; data can be saved manually or automatically.
• Sample/Operator ID: Alphanumeric, max. 12 characters; 12 sample names and 20 user names. Automatic logging of sample numbers (0 – 999).
• Measurement Mode: Manual, interval, continuous; analytical methods editable.
• Display: Backlit graphic display; 240 × 160 pixels; automatic switch-off in economy mode. Date and time display. Simultaneous display of two parameters on HQ 40D.
• Power Supply: 115 V / 250 V (power unit optional).
• Battery Operation: 4 AA batteries or rechargeable batteries (battery charger needed).
• Protection Class: IP 67 for instrument, outdoor electrodes, and connections.
• Dimensions, Weight: 95 × 197 × 36 mm (H × W × L), 323 g (without batteries).

Electrodes / Sensors

All INTELLICAL electrodes/sensors are watertight to a depth of 3 metres for 24 hours, including the temperature sensor. Outdoor electrodes/sensors are watertight to a depth of 30 metres for 24 hours, with a steel housing and reinforced cable.

• pH: Standard (liquid or gel electrolyte), rugged outdoor, and ULTRA (for low ionic strengths). Cable lengths from 1 m to 30 m.
• Conductivity: Standard and rugged outdoor 4-pin graphite electrodes. Cable lengths from 1 m to 30 m.
• LDO (Dissolved Oxygen): Standard and rugged outdoor sensors. Cable lengths from 1 m to 30 m. Includes a specific sensor for BOD measurement.
• ORP: Standard and rugged outdoor electrodes with gel or liquid electrolyte. Cable lengths from 1 m to 30 m.
• Ion Selective Electrodes (ISE): Sodium, Chloride, and Fluoride ISE standard electrodes. Available with 1 m or 3 m cables.

Buffer and Conductivity Standard Solutions

A range of certified pH buffer solutions (IUPAC and DIN standards) and conductivity standard solutions (KCl and NaCl) are available in various quantities and concentrations, traceable to standard reference materials.

• pH Buffer Solutions: Certified standards and quality buffer solutions in bottles, powder pillows, and single pouches.
• Conductivity Standard Solutions: Certified solutions including KCl and NaCl in various concentrations.

Accessories

• Outdoor Kit
• Electrode holder
• Cases (for standard and outdoor electrodes)
• Cable markers
• Electrode markers
• USB-/AC-adaptor
• USB stick (128 MB capacity)
• Keyboard with USB connector
• LDO sensor cap
• Stand for HQD meters
• Probe holder
• BOD manager PC software

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror