The S1600/1400 series pH meters work with a corresponding range of solid state ISFET pH sensors that offer accurate and reliable pH measurements for demanding applications. The SI600 meter contains extensive features required for high-end pH measurements and the probes are available with a variety of tip shapes to match your application.

See here for Digital ISFET pH probe for inline process applications

  • Non glass ISFET pH electrodes
  • Multi point pH calibration
  • Micro Probe option
  • Compact electronic design
  • User replaceable battery
  • Rechargeable
  • Includes concussion protetive boot
  • Data logging (SI600)
  • PC communication by USB
  • Replaces Sentron
    Titan and Argus meters

Accurate and reliable
The SI600 meter’s advanced electronics can achieve a resolution of 0.005 pH for very sensitive pH measurements. The meter’s ability to offer reliable pH measurements in demanding conditions is the result of the robust ISFET sensor integrated into our probes. Unlike glass pH electrodes, ISFET pH sensors are highly resilient and do not require wet storage.

User friendly
A large backlit 3.2” LCD colour display allows convenient determination of measurement values and provides clear information for operation. The pH value is displayed in a large font and is continuously displayed during menu operation. The intuitive and user friendly interface allows quick access to the meter’s advanced features and settings. Large ergonomically placed buttons facilitate easy menu navigation and selection of options.

Intelligent features
The intelligent calibration wizard simplifies the calibration process, reducing calibration time and the chance for errors. A full calibration report is displayed at the end of the procedure. The SI600 supports 1-, 2-, 3- and 5-point calibration. The meter also contains various settable alarms that provide an audible warning when measured pH or temperature values are out of range or when maximum time between calibrations has been exceeded. For advanced users, bias setting can be manually defined.

Durable Design
The S1600 hasan IP65 rating and a rubber boot that helps to absorb shocks. The light-weight and compact body makes it highly suitable for field use and handheld applications. The meter has also been designed so that it is stable when placed on a table, making it well suited for laboratory table-top use. The meter’s three AA-batteries can be recharged using the supplied AC adapter or exchanged with spare batteries when no power source is available.

Data acquisition & PC communication
The SI600 has advanced data acquisition capabilities, that permit extensive storage of measured data points and continuous data logging at a user defined time interval. Stored and logged data points can be transmitted to a PC through the USB port and with suitable software the meter’s momentary pH value and temperature can be queried.

Ph is a measure of the degree of the acidity or the alkalinity of a solution as measured on a scale of 0 to 14. The midpoint of 7.0 on the pH scale represents neutrality. A "neutral" solution is neither acid nor alkaline. pH below 7.0 indicate acidity; pH above 7.0 indicate alkalinity. pH indicates the intensity of alkalinity or acidity in the same way temperature tells how hot something is but not how much heat the substance carries. More specifically, pH is the negative of the logarithm of the hydrogen ion concentration of a solution. The hydrogen ion concentration is the weight of hydrogen ions, in grams, per liter of solution. In neutral water, for example, the hydrogen ion concentration is 10E-7 grams per liter; the pH is therefore 7. Since it is hydrogen that is responsible for acidity and alkalinity, the abbreviation "pH" stands for "potential of hydrogen." The neutral point of 7.0 actually indicates the presence of equal concentrations of free hydrogen and hydroxide ions.
  SI400 SI600
Accuracy* +/- 0.01 +/- 0.01
Resolution* 0.01 0.005
Range* pH 0.00.... 14.00
Calibration Smart calibration wizard
1-point / 2 point 1/2/3/5 point
Buffer Types Sentron Sentron/ DIN, NIST, JIS
Automatic Temperature Correction yes yes
Accuracy* +/- 0.5ºC (0.9ºF)
Resolution* 0.1ºC/F
Range* -5...120ºC (20...250ºF)
*= dependent on probe used
Languages English, Dutch, French, German, Spanish
Bias Setting (user definable fixed offset value) pH 0.00 ... 9.99
Data Handling Store 10 current measurement values manually Store 500 current measurement values manually
Log max. 65,000 measurements automatically at user definable interval 1-60sec
Send logged data file to PC through USB
Remote readout from PC through USB (1 per sec)
Alarm Setpoints and warnings ( user definable min/max settings)
Stability Check (change in ph per time unit)
Physical Properties
Dimensions (W x H x D) 80mm x 160mm x 36mm
Weight 379grams
Operation 8hours continuous, 30 hours with power save enabled
Protection Rating IP65 ( splash water resistant)
Batteries 3 x AA NiMH 2600mAh, Replacable , rechargeable via USB, recharge time approx 8 hours.


The ConeFET pH probe is a general purpose probe with a conical tip designed to be used for a wide range of pH sensing applications. For example, the ConeFET can be used in the laboratory for sampling of liquids, with a wide range of viscosities, in a flask or beaker. It is also well suited for use in the field or in industry. Applications for which Sentron’s customers use ConeFET probes include laboratory testing, environmental water quality monitoring, food quality monitoring and monitoring of pH in pharmaceutical / nutritional processes.

ISFET = glass-free
In contrast to conventional glass pH electrodes, ISFET pH sensors are robust and do not require wet storage. This makes them well suited for many environmental, food and pharmaceutical applications. Even in areas like education or in laboratories, where glass pH electrodes can be used, ISFET pH measurement technology offers a much more durable and reliable solution.

Fast response time
ISFET pH sensors are fast because they measure directly at the surface. Sentron’s SI series probes can give stable readings in under 5 seconds for almost all samples.

Sentron probes are built from high quality ABS, PVC and PEEK materials. They are resistant to many aggressive solutions and can withstand rugged use. At the same time, they are light weight and easy to handle.

The probes have a polymer body snap-on type connector. Unlike DIN and bayonet type connectors, there are no moving parts nor screw thread that can be damaged. The position of the ISFET and reference electrode has been designed to be clog and pollution resistant. In the event debris has accumulated on the sensor it can be easily cleaned with water and a brush.
The probes are provided with protection against Electrostatic Discharge (ESD) ensuring measure-ments continue even in harsher electrostatic environments.

Easy handling
The ergonomic design makes the probe easy to hold. Its reduced weight and soft flexible cable allow it to be used in long flasks and/or low beakers without tipping the container.


ConeFET: Robust general purpose probe. 3280-010
CupFET: Probe for measurements of small 3200-010 liquid samples.
LanceFET: Steel tipped probe for penetration 2270-010 and measurement of non-liquids such as meat and fruit.
LanceFET+H: Equal to LanceFET but with large 2274-010 handle for additional grip.
MiniFET: Compact and sturdy probe with a 9202-010 5mm (0.2”) diameter barrel, ideal for embedded application.
MicroFET: Laboratory probe with a very small 9270-010 3mm (0.1”) diameter barrel that fits test tubes and mini-cuvettes.

Specifications and selection for the ISFET pH probes
Ordering Information or order online at
7600-005 SI600 pH meter with data logging $1395.00
7400-005 SI400 pH meter stanard model $850.00
2270-010 LanceFET 0-80ºC, non flow, gelled, PTFE diaphragm $620.00
2274-010 LanceFET w/ Handle 0-80ºC, non flow, gelled, PTFE diaphragm $650.00
3200-010 CupFET 0-80ºC, non flow, gelled, PTFE diaphragm $550.00
3280-010 ConeFET 0-80ºC, non flow, gelled, PTFE diaphragm $550.00
9270-010 MicroFET 0-70ºC, non flow, gelled, ceramic diaphragm $995.00
9202-010 MiniFet 5mm, 0-80ºC non flow, gelled, ceramic diaphragm $550.00

Topac Inc. 231 CJC Highway Suite 103 Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779

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