SYSTRONICS pH System 361 – Digital Microprocessor-Based pH Meter

The Systronics µpH System 361 Digital pH Meter is a microcontroller-based laboratory analytical instrument designed for accurate measurement of the acidity and alkalinity of liquid samples. It is suitable for routine laboratory testing, pharmaceutical research, chemical analysis, water quality testing, biotechnology applications and quality control procedures. The instrument provides reliable measurement of pH, millivolt potential and temperature, making it a versatile solution for laboratories that require monitoring of different liquid sample parameters.

The Systronics Model 361 operates using a compatible pH electrode that detects the hydrogen ion activity of a solution and converts it into an electrical signal. The instrument processes this signal and displays the corresponding pH value digitally. It offers a pH measurement range of 0 to 14 pH, with a resolution of 0.01 pH. This enables laboratory personnel to monitor acidic, neutral and alkaline solutions during routine analytical procedures.

One of the important features of this equipment is its microcontroller-based operating system. The electronic control system supports measurement stability, calibration and convenient operation. Its front control panel contains dedicated function keys for selecting measurement modes, carrying out calibration procedures and operating different instrument functions. The digital LED display allows users to observe measurement readings conveniently.

The instrument supports three-point pH calibration, allowing users to calibrate the system using suitable standard buffer solutions. Calibration is an important procedure because pH electrode response may change over time due to ageing, contamination and regular use. By calibrating the instrument against standard buffer solutions, laboratory users can maintain measurement accuracy and improve the reliability of analytical results.

Another important feature is automatic and manual temperature compensation. Temperature can influence pH electrode response and the measured pH value. The Model 361 supports temperature measurement through a compatible PT-100 temperature probe. This allows the instrument to account for temperature-related electrode response during measurement. The temperature compensation feature is particularly useful in laboratories handling samples under varying temperature conditions.

In addition to pH measurement, the Systronics 361 provides absolute millivolt and relative millivolt measurement modes. These functions allow the instrument to measure the electrical potential generated by compatible sensing electrodes. The millivolt measurement capability makes it useful for certain electrochemical applications and laboratory investigations involving oxidation-reduction potential and electrode response.

The equipment is supplied in a compact, lightweight and robust cabinet designed for benchtop laboratory installation. Its compact construction helps save valuable laboratory workspace while providing convenient access to the control panel. The separate electrode stand and clamp support the positioning of the electrode during sample measurement, reducing the risk of accidental damage to the sensitive glass electrode.

The instrument also provides a printer interface compatible with an 80-column dot-matrix printer. This facility can be used for recording and documenting measurement results when the appropriate printer and connection accessories are available. It is useful in laboratories that maintain written analytical records and require printed measurement data.

The Systronics µpH System 361 is suitable for pharmaceutical laboratories, research and development departments, chemical testing facilities, food testing laboratories, water analysis laboratories and educational institutions. It can be used for measuring the pH of buffer solutions, chemical reagents, purified water, pharmaceutical preparations, laboratory media and other compatible liquid samples.

In pharmaceutical manufacturing and quality control, pH measurement is important for checking the acidity or alkalinity of formulations, raw materials and process solutions. In biotechnology and microbiology laboratories, it is useful for monitoring culture media, buffers and preparation solutions. Environmental laboratories can use the instrument for routine water sample testing and related analytical procedures.

The Systronics Model 361 combines microcontroller-based measurement, temperature compensation, calibration functionality and multiple measurement modes in a practical benchtop design. Its 0–14 pH range and 0.01 pH resolution make it a useful instrument for routine analytical work.

For refurbished or used equipment, the condition of the pH electrode, temperature probe, electrode cable, display, keypad and power supply should be checked. Calibration should also be verified using certified buffer solutions before the instrument is used for critical laboratory measurements.

2.2 Applications of the Product

1. Pharmaceutical Laboratories: Measurement of pH in pharmaceutical formulations, raw materials and chemical solutions.

2. Research and Development: pH monitoring during laboratory experiments and formulation development.

3. Water Testing Laboratories: Analysis of drinking water, purified water, wastewater and other water samples.

4. Chemical Laboratories: Measurement of acidity and alkalinity of chemical solutions and reagents.

5. Biotechnology Laboratories: Monitoring pH in buffers, biological solutions and preparation media.

6. Microbiology Laboratories: Checking pH levels of microbiological culture media.

7. Food and Beverage Industry: pH testing of food ingredients, beverages and processing solutions.

8. Environmental Laboratories: Monitoring pH in environmental and wastewater samples.

9. Quality Control Departments: Routine pH testing of raw materials, intermediates and finished products.

10. Educational Institutions: Practical experiments in analytical chemistry and laboratory sciences.

2.3 Features of the Product

• Microcontroller-based digital pH measurement system.

• pH measurement range of 0–14 pH.

• High-resolution measurement of 0.01 pH.

• Three-point pH calibration facility.

• Automatic and manual temperature compensation.

• Compatible with PT-100 temperature probe.

• Measures pH, absolute mV and relative mV.

• Digital LED display with seven-digit readout.

• Dedicated function keys for convenient operation.

• Compatible pH electrode for liquid sample measurement.

• External electrode stand and clamp arrangement.

• Printer interface for compatible 80-column dot-matrix printer.

• Compact and lightweight benchtop construction.

• Suitable for pharmaceutical, chemical and research laboratories.

• Designed for routine analytical and quality control applications.

2.4 Technical Specifications

Specifications based on the Systronics Model 361 product documentation. Confirm the supplied electrode, temperature probe and accessories against the actual unit.

2.5 Product Condition

Condition: To be specified – Brand New / Refurbished / Used.

Recommended condition checklist:

• Physical condition: As shown in the photograph.

• Display: To be tested.

• Control keypad: To be checked.

• pH electrode: Availability and condition to be verified.

• Temperature probe: Availability and functionality to be checked.

• Electrode stand: Visually present.

• Calibration: To be verified using standard buffer solutions.

• Power adapter: To be confirmed.

• Printer interface: To be tested if required.

• Accessories: To be confirmed before dispatch.