AquaSearcher™ AB33 Benchtop Meters
The AquaSearcher™ AB33 benchtop meter represents OHAUS's advancement in reliable, efficient laboratory measurement technology. Featuring a 6.5 inch LCD display with touch keypad interface, the AB33 delivers smartphone-like simplicity for parameter adjustment, setup execution, and calibration procedures. The intelligent i-Steward technology monitors electrode conditions to ensure repeatable and consistent measurement accuracy.
Model Overview
AB33PH
Dedicated pH and oxidation-reduction potential (ORP) measurements with temperature monitoring.
AB33EC
Comprehensive conductivity analysis including Total Dissolved Solids (TDS), Salinity, and Resistivity measurements with temperature monitoring.
AB33M1
Multi-parameter meter combining pH, oxidation-reduction potential (ORP), Conductivity, Total Dissolved Solids (TDS), Salinity, and Resistivity measurements with temperature monitoring.
Key Capabilities
- Multifunctional touch keypads enable simple, fast measurement within 3 steps
- i-Steward intelligent monitoring of electrode condition ensures result accuracy
- Auto endpoint mode and auto buffer recognition simplify pH calibration
- Automatic temperature compensation with adjustable TDS factor
- Compatibility with two kinds of cell conductivity probes for universal laboratory applications
- Internal memory storage for up to 1000 items with time and date stamping for efficient data documentation
- Standard RS232 and USB interfaces for connection to external devices, printers, and computers
- Standalone adjustable electrode holder provides flexibility for different electrode types
Intelligent Features
The i-Steward indicators provide real-time status information including pH electrode condition, "Electrode Dirty/Broken" alerts, and recalibration reminders. On-screen text prompts and menu-specific function keys are displayed on the large 6.5" screen with multi-language interface support.
Three capacitive touch keys change based upon use, ensuring buttons are never clogged with sample residue. Auto-Stop mode holds stable readings while Continuous mode shows changing readings. Perform up to a 3-point pH calibration using automatic buffer recognition from 3 predefined buffer groups (AB33PH) or 5 predefined buffer groups (AB33M1).
Selectable cell constant allows use with 2- or 4-cell conductivity cells to measure from ultrapure water to sewage. The adjustable TDS factor relates conductivity to total dissolved solids based on sample type. Linear compensation coefficient adjusts automatically for correct temperature compensation when measuring conductivity. Selectable reference temperatures of 20 or 25 ºC are available for temperature compensated conductivity readings.
Technical Specifications
| Parameter |
a-AB33PH |
a-AB33EC |
a-AB33M1 |
| pH |
| Measuring Range |
-2.00 to 16.00 pH |
n/a |
-2.00 to 20.00 pH |
| Resolution |
0.1/0.01 pH |
n/a |
0.1/0.01 pH |
| Selectable Resolution |
Yes |
n/a |
Yes |
| Accuracy |
± 0.01 pH |
n/a |
± 0.01 pH |
| Pre-Defined Buffer Groups |
3 |
n/a |
5 |
| ORP, Redox |
| Measuring Range |
±2000.0 mV |
n/a |
±2000.0 mV |
| Resolution |
1 mV |
n/a |
0.1mV |
| Accuracy |
± 1 mV |
n/a |
±0.5 mV |
| Units |
mV, RmV |
n/a |
mV, RmV |
| Conductivity |
| Measuring Range |
n/a |
0.001μS/cm to 19.99 μS/cm
20 μS/cm to 199.9 μS/cm
200 μS/cm to 1999 μS/cm
2.00 mS/cm to 19.99 mS/cm
20.0 mS/cm to 1000 mS/cm |
0.01 μS/cm to 19.99 μS/cm
20 μS/cm to 199.9 μS/cm
200 μS/cm to 1999 μS/cm
2.00 mS/cm to 19.99 mS/cm
20.0 mS/cm to 500.0 mS/cm |
| Resolution |
n/a |
0.001 μS/cm minimum; auto-range |
0.01 μS/cm minimum; auto-range |
| Accuracy |
n/a |
± 0.5 % Reading ± 2 Least Signficant Digit |
± 0.5 % Reading ± 2 Least Signficant Digit |
| Reference Temperature |
n/a |
20 °C, 25 °C |
20 °C, 25 °C |
| Cell Constants |
n/a |
0.01 to 10.00 cm-1 |
0.001 to 10.00 cm-1 |
| Temperature Compensation |
n/a |
Linear (0 to 10.0%/ºC), off |
Linear (0 to 10.0%/ºC), off |
| TDS |
| Measuring Range |
n/a |
0.1 mg/L to 200 g/L |
0.1mg/L to 199.9 g/L |
| Resolution |
n/a |
0.01 mg/L minimum, auto-range |
0.01 mg/L minimum, auto-range |
| Accuracy |
n/a |
± 0.5 % Reading ± 2 Least Signficant Digit |
± 0.5 % Reading ± 2 Least Signficant Digit |
| TDS Factor Range |
n/a |
Linear, 0.01 to 10.00, default 0.5 |
Linear, 0.01 to 10.00, default 0.5 |
| Resistivity |
| Measuring Range |
n/a |
1 to 100 MΩ-cm |
2 to 100 MΩ-cm |
| Resolution |
n/a |
0.01 Ω-cm auto-range |
0.01 Ω-cm auto-range |
| Accuracy |
n/a |
± 0.5 % Reading ± 2 Least Signficant Digit |
± 0.5 % Reading ± 2 Least Signficant Digit |
| Practical Salinity |
| Measuring range |
n/a |
0 to 100 psu |
0 to 100 psu |
| Resolution |
n/a |
0.01 psu minimum, auto-range |
0.01 psu minimum, auto-range |
| Accuracy |
n/a |
± 0.5 % Reading ± 2 Least Signficant Digit |
± 0.5 % Reading ± 2 Least Signficant Digit |
| Temperature |
| Measuring Range |
-5.0 to 110.0°C
23.0°F to 230.0°F |
| Resolution |
0.1 °C, 0.1 °F |
| Accuracy |
± 0.5 °C, ±0.5 °F |
± 0.3 °C, ±0.3 °F |
± 0.3 °C, ±0.3 °F |
| Calibration |
No Calibration |
Calibration |
Calibration |
Calibration
| Feature |
a-AB33PH |
a-AB33EC |
a-AB33M1 |
| Calibration points |
Up to 3 points |
1 point cell constant calibration; 6 conductivity standard solutions available (10, 84, 146.5, 500, 1413 μS/cm and 12.88mS/cm) |
Up to 5 points for pH; 1 point cell constant calibration; 6 conductivity standard solutions available (10, 84, 146.5, 500, 1413 μS/cm and 12.88mS/cm) |
| Calibration Sign |
Slope/offset & Face |
Cell Constant & Face |
Slope/offset & Cell Constant & Face |
| Calibration mode |
Linear |
Linear |
Linear |
Meter Specifications
| Feature |
Specification |
| Display Type |
6.5" Segment & Dot matrix LCD with backlight |
| Multilanguage User Interface |
English, Spanish, French, Portuguese, Chinese, Russian and Turkish |
| Measurement End-point Modes |
Auto-stop, Continuous |
| Datalog for measurement |
1000 sets data points with time and date stamp |
| Datalog for calibration |
Last calibration |
| Keypad |
Capacitive touch |
| Output |
Connect to PC via RS232 and USB, Connect to Printer via RS232 |
| pH electrode input |
BNC |
| Conductivity input |
Mini-Din |
| Temperature input |
Cinch, NTC 30 kΩ |
| Installation Overvoltage |
Category II |
| Pollution |
Degree 2 |
| Power Supply |
Universal, 100-240 VAC, 50-60 Hz |
| Ambient Operating |
5 to 40 ˚C, 5 to 80 %, non-condensing |
Additional Features
- Operation: AC adapter (included)
- Communication: RS232, USB Device (included)
- Construction: Capacitive touch, ABS housing, standalone electrode holder
- Design Features: i-
