Sato SK-650PH Desktop Digital pH Meter
The Sato SK-650PH (6427-00) is a benchtop pH meter for sample measurement at a fixed workstation. Its sensor arm helps position the electrode, while stability and sensor-sensitivity indicators support routine measurement and maintenance.
The meter is supplied without a probe. Select the electrode for the sample, temperature and container size, and order suitable calibration solutions separately.
Key Features
- Automatic temperature compensation with a suitable temperature-sensing arrangement.
- One- to three-point calibration.
- Memory for up to 99 records.
- Reading, date and time displayed together.
- RS-232C data transfer using an optional cable.
- Sensor sensitivity and reading-stability indicators.
Meter Specifications
| Specification | SK-650PH |
|---|
| Catalogue number |
6427-00 |
| pH display range |
0.00 to 14.00 pH |
| Temperature display range |
−6.0 to 82.0°C |
| Electrode potential display |
−2002 to +2002 mV |
| Resolution |
0.01 pH; 0.1°C; 0.1 mV within −199.9 to +199.9 mV and 1 mV outside that interval |
| Repeatability |
pH: ±(0.01 + 1 digit); temperature: ±(0.1 + 1 digit)°C |
| Measurement accuracy and usable range |
Depend on the connected probe |
| Sampling interval |
Approximately 1 second |
| Operating environment |
5 to 40°C; below 95% RH, non-condensing |
| Power |
Dedicated AC adaptor |
| Included accessories |
Sensor arm, AC adaptor and instruction manual |
Display range and repeatability are not the same as complete-system measuring range and accuracy. Apply the limits of the selected electrode and temperature sensor.
Probe Selection
| Model | Catalogue number | Probe type / application |
|---|
| PHP-31 |
6400-30 |
Standard pH and temperature probe; non-refillable internal solution |
| 640S-1 |
6424-00 |
General-purpose probe |
| 640S-2 |
6425-00 |
Immersion probe for applications such as tanks |
| 640S-3 |
6425-10 |
High-alkali probe |
| 640S-4 |
6425-20 |
Flat-surface probe |
| 640S-5 |
6425-30 |
Test-tube probe |
| 640S-6 |
6425-40 |
Small-volume sample probe |
| 640S-T |
6425-90 |
Separate temperature probe for temperature compensation |
640S-4, 640S-5 and 640S-6 do not contain a temperature sensor. Consider the 640S-T for temperature compensation with these electrodes. Confirm probe availability and sample compatibility when ordering.
PHP-31 Standard Probe Specifications
| Specification | PHP-31 |
|---|
| pH range |
0.00 to 14.00 pH |
| Temperature range |
0.0 to 50.0°C |
| pH accuracy |
±0.28 pH at pH 0–2; ±0.08 pH at pH 2–12; ±0.38 pH at pH 12–14 |
| Temperature accuracy |
±0.3°C at 20–30°C; ±0.5°C elsewhere within range |
| Sensors |
Glass pH electrode and thermistor |
| Internal solution |
Non-refillable KCl solution |
| Probe dimensions |
12 mm diameter × 135 mm long |
| Cable length |
1 m |
Calibration and Measurement Notes
Calibration points are selected from pH 4.01, 6.86, 9.18 or 10.01 at 25°C. Choose buffers appropriate to the expected sample range and follow the electrode instructions for cleaning and storage.
- Check compatibility before measuring solvents, oils, adhesives, surfactants or strongly acidic or alkaline samples.
- Pure water and tap water can give unstable readings with this electrode system.
- For food or drink, measure a separate sample and discard it afterwards.
- The glass electrode requires careful handling.
Sato specifies that this model is not intended for transaction or certification purposes.
Need Help Selecting a pH Meter?
Contact Seacom with your sample type, expected pH, sample temperature and available volume. Include any data-transfer requirements so we can help select the SK-650PH, suitable probe and calibration accessories.
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Digital pH Meter Catalogue
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