Portable pH/Ion Meter PH-320 (CAT#: STEM-OEM-0266-ZJF)

The Portable pH/Ion Meter is a compact, versatile, and reliable instrument designed for field and on-site measurement of pH levels and ion concentrations in various liquid samples. It supports a wide range of optional ion-selective electrodes, including: ammonium (NH₄⁺), bromide (Br⁻), cadmium (Cd²⁺), calcium (Ca²⁺), chloride (Cl⁻), cupric (Cu²⁺), cyanide (CN⁻), fluoride (F⁻), iodide (I⁻), lead (Pb²⁺), nitrate (NO₃⁻), potassium (K⁺), silver (Ag⁺), sodium (Na⁺), sulfide (S²⁻), and ammonia (NH₃).
Accessories include: pH electrode, temperature probe, pH buffer solutions (pH 4.01 / 7.00 / 10.01), and a carrying case.

pH
- Range: -2.000~20.000 pH
- Accuracy: ±0.002 pH
- Resolution: 0.1, 0.01, 0.001 pH, selectable
- Calibration Points: 1~5 points
- pH Buffer Options:
USA (pH 1.68/4.01/7.00/10.01/12.45),
NIST (pH 1.68/4.01/6.86/9.18/12.45),
DIN (pH 1.09/4.65/6.79/9.23/12.75), or 2 custom buffers
ORP
- mV Range: -1999.9~1999.9 mV
- Relative mV Range: -1999.9~1999.9 mV
- Accuracy: ±0.2 mV
- Resolution: 0.1, 1 mV, selectable
- Calibration Points: 1 point (only for Relative mV mode)
Ion
- Concentration Range: 0.001~19999 ppm, mg/L, mol/L (depending on ISE range)
- Accuracy: ±0.5% F.S. (monovalent), ±1% F.S. (divalent)
- Calibration Points: 2~5 points
- Calibration Solutions: 0.001, 0.01, 0.1, 1, 10, 100, 1000, 10000
Temperature
- Range: 0~105°C / 32~221°F
- Accuracy: ±0.5°C / ±0.9°F
- Resolution: 0.1°C / 0.1°F
- Offset Calibration: 1 point, reading ±10°C
- Temperature Compensation: 0~100°C, manual or automatic
Other Specifications
- Stability Criteria: Low or high
- Calibration Due Alarm: 1 to 31 days or off
- Slope/Offset Display: Yes
- Hold Function: Manual or auto-endpoint
- Auto-Off: 10, 20, or 30 minutes after last key press
- Memory: 500 data sets
- Communication Interface: USB
- Connector: BNC, 3.5 mm jack socket
- Display: Custom LCD (80×60 mm)
- Power Requirements: 3×1.5V AA batteries or DC5V power adapter
- Battery Life: Approx. 150 hours (with backlight off)
- Dimensions (W×D×H): 170×85×30 mm
- Package Size: 475×155×350 mm
- Net Weight: 300 g
- Gross Weight: 2 kg

pH Measurement
1 to 5 points calibration with automatic recognition for USA, NIST, and DIN buffers.
Automatic electrode diagnosis displays pH slope and offset.
ORP Measurement
1-point offset calibration for adjusting readings to a known standard.
Supports both relative and absolute millivolt measurement modes.
Ion Concentration Measurement
2 to 5 points calibration with up to 8 selectable concentration points.
Direct readout of ion concentration simplifies the measurement process.
Automatic electrode diagnosis shows calibration points and slopes.
Selectable concentration units: ppm, mg/L, mol/L, mmol/L, and ionic valency.
General Features
Automatic temperature compensation ensures accurate readings across the full range.
Auto-Read function senses and locks the measurement endpoint.
Calibration due alarm reminds users to perform timely calibration.
Auto-Power Off function conserves battery life.
Setup menu allows configuration of calibration points, resolution, stability criteria, temperature unit, date, and time.
Reset function restores all settings to factory defaults.
Memory stores or recalls up to 500 data sets.
USB interface for easy data transfer to PC.
Multi-mode power supply (batteries, power adapter, and USB) ensures flexible and uninterrupted operation.

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