Hanna HI9146 | Portable Dissolved Oxygen Meter (Polarographic)

Achieve laboratory-grade precision in the field with the Hanna HI9146, a rugged, microprocessor-based Portable Dissolved Oxygen Meter. While the HI9147 is built for speed in fish farming, the HI9146 is designed for regulatory compliance and high-range analysis in Pakistan’s wastewater treatment plants, environmental research agencies, and industrial aeration systems.

The HI9146 utilizes a Polarographic Probe (HI76407) based on the Ross and Clark method, the gold standard for official water quality reporting. This technology offers superior linearity and allows for an extended measurement range of 0.00 to 45.00 mg/L (ppm) and 300% saturation. This is critical for monitoring "super-saturated" waters often found in algae-heavy ponds or intensive aeration tanks where standard meters (capped at 20 ppm) would fail.

Unlike manual analog meters, the HI9146 features Automatic Calibration at 100% (in air) and 0% (solution), removing human error from the setup process. It also includes Good Laboratory Practice (GLP) capabilities, allowing you to recall the last calibration data—a mandatory requirement for many ISO-certified labs and environmental audits.

Key Features of the Product

• Extended Range (45 ppm): Measures Dissolved Oxygen up to 45.00 mg/L, making it capable of handling supersaturated samples that exceed the limits of standard field meters.
• Polarographic Accuracy: Uses the Clark-type polarographic sensor method, preferred for its stability and acceptance in standard methods for water and wastewater examination.
• Automatic Calibration: Calibrates automatically at the touch of a button in saturated air (100%) or zero oxygen solution (0%), ensuring consistent accuracy without manual trimmer adjustments.
• Advanced Compensation: Features Automatic Temperature Compensation (ATC) alongside user-adjustable Altitude (up to 4000m) and Salinity (0 to 80 g/L) compensation, ensuring precise readings regardless of your location or water type.
• GLP Features: The "Good Laboratory Practice" button allows you to instantly view the last calibration data (date, time, slope), ensuring your measurements are traceable for audits.
• Auto-End Mode: Eliminates guesswork by automatically freezing the reading on the display once it stabilizes, ensuring different operators get the same result.

Frequently Asked Questions (FAQs)

Q: What is the difference between the HI9146 and HI9147?

A: Technology and Speed.

• HI9147 (Galvanic): Instant on, no warm-up. Best for "grab-and-go" fish farming checks. Manual calibration.
• HI9146 (Polarographic): Requires 15 minutes warm-up to polarize. Best for regulatory reporting, wastewater, and research where higher precision, GLP, and auto-calibration are required.

Q: Why does the polarographic probe need warm-up time?

A: The sensor requires a constant voltage to be applied to the cathode to create a stable "polarization" field. If you measure before this 15-minute warm-up is complete, your readings will drift downward.

Q: Can I use this for seawater?

A: Yes. The HI9146 has digital Salinity Compensation (0 to 80 ppt). You simply enter the salinity value of your water, and the microprocessor calculates the correct oxygen level automatically.

Q: How often should I change the membrane?

A: For a polarographic probe, we recommend changing the PTFE Membrane Cap (HI76407A) and electrolyte every 8 weeks, or immediately if the membrane becomes wrinkled or damaged.

Buy with Confidence

Equip your lab with the standard in dissolved oxygen analysis. Order the authentic Hanna HI9146 Polarographic DO Meter from Kamadi Pakistan today. As a leading reseller of analytical instruments, we provide genuine spare membranes, electrolyte solutions, and calibration standards to keep your facility compliant.