Yexsensor YEX-PHG-206A: Industrial Long-Life Online pH Sensor

In industrial production, environmental monitoring, and chemical reaction processes, accurate monitoring of pH value directly affects product quality and system safety. The YEX-PHG-206A online pH sensor launched by Yexsensor provides a highly stable and durable monitoring solution for global water treatment integrators and industrial users with its unique patented reference electrode design and excellent anti-interference performance.

Core Technical Advantages: Designed for Complex Working Conditions

1. Patented Long-Life Reference System (Exclusive Advantage)

Ordinary industrial pH electrodes often fail due to excessively fast loss or contamination of the reference solution. Yexsensor’s patented design ensures that the internal reference solution seeps out slowly from the microporous salt bridge at an extremely small rate under a pressure of ≥100KPa (1Bar).

• Ultra-long life: Forward seepage can last more than 20 months, and the service life is doubled compared to ordinary industrial electrodes.

• High stability: Positive pressure seepage effectively prevents the measured medium from permeating and contaminating the inside of the electrode, greatly reducing maintenance frequency.

2. Dual High-Impedance Differential Amplifier

Aimed at the complex electromagnetic environment of industrial sites, the YEX-PHG-206A adopts advanced dual high-impedance differential amplification circuit:

• Strong anti-interference: Effectively suppresses common-mode interference generated by industrial motors and frequency converters.

• Sensitive response: T90 response time is less than 30 seconds, reflecting pH fluctuations in chemical reactions in real time.

3. Digitalization and Intelligent Compensation

Standard communication: Supports RS-485 (Modbus RTU) protocol, easily connecting to PLC, DCS and cloud monitoring systems.

Temperature correction: Built-in Pt1000 automatic temperature compensation ensures that measurement accuracy is always maintained at ±0.1 pH under temperature fluctuations of 0-50°C.

YEX-PHG-206A Industrial Online pH Sensor Application Scenarios and Solutions

YEX-PHG-206A can meet the stringent requirements of most industrial applications:

• Industrial Wastewater and Environmental Monitoring
  In the treatment of acid, alkali, salt solutions and discharge monitoring, the sensor shows excellent stability. The IP68 protection rating supports long-term submersible operation without fear of harsh environments.

• Chemical Reaction Process Control
  In fine chemical and pharmaceutical processes, small deviations in pH value may lead to reaction failure. The high-precision reading of the Yexsensor sensor can serve as a reliable input source for closed-loop dosing systems.

• Industrial Circulating Water and Desulfurization & Denitrification
  Used to monitor the scaling tendency of cooling circulating water or the pH value of slurry in flue gas desulfurization systems to protect pipeline equipment from corrosion.

YEX-PHG-206A Industrial Online pH Sensor Technical Performance Parameters

YEX-PHG-206A Industrial Online pH Sensor Installation Guide and Electrical Connection

Standard Installation Key Points

Angle requirement: The sensor must not be installed upside down or horizontally. To ensure normal pressure of the electrolyte inside the electrode and to remove air bubbles, the installation angle should be tilted more than 15 degrees from the horizontal plane.

Environmental preparation: Before installation, please ensure that the 3/4 NPT thread connection is well sealed to prevent water leakage.

Electrical Wiring Definition (4-core Shielded Cable)

• Red wire: Power positive pole (V+)

• Black wire: Power negative pole (GND)

• Blue wire: RS-485 A (Signal +)

• White wire: RS-485 B (Signal -)

Wiring tips: All wiring points must be strictly waterproofed. If the cable is exposed or immersed in corrosive liquids for a long time, it is recommended to add additional protective sleeves.

YEX-PHG-206A Industrial Online pH Sensor Maintenance and Care Recommendations

Daily Cleaning and Activation

First use: Before measurement, please clean with distilled water and dry with filter paper. The recommended immersion depth is at least 1/3 of the electrode length.

Electrode cleaning: If deposits or semi-transparent film appear on the glass membrane after long-term use, it can be briefly washed with dilute hydrochloric acid and rinsed thoroughly. Do not contact with organosilicon grease.

Storage Specifications

Short-term storage: When the sensor is not in use, it should be cleaned and inserted into a protective sleeve containing 3mol/L potassium chloride (KCl) solution.

Long-term storage: Ensure that the electrode bulb remains moist at all times. Do not store dry to prevent glass membrane failure.

Common Questions and Answers (FAQ)

Q1: How long is the typical electrode life of the YEX-PHG-206A sensor?

A1: Thanks to our patented seepage system, the reference solution can work stably for more than 20 months. Actual life depends on working conditions (such as high temperature, strong acid and alkali), but in standard industrial environments, its life far exceeds that of ordinary industrial electrodes.

Q2: Why can't the sensor be placed horizontally during installation?

A2: Horizontal installation easily generates air bubbles inside the glass electrode bulb, resulting in poor contact between the electrode and internal liquid, thus causing large reading jumps or measurement errors.

Q3: Can the standard cable length be customized?

A3: Yes. The standard length is 5 meters. We can provide personalized cable customization according to your site distance.

Q4: Has the sensor been calibrated before leaving the factory?

A4: Yes. All Yexsensor sensors are pre-calibrated. Frequent calibration by users is not recommended unless there is obvious deviation in the value.

Q5: What standard powders need to be prepared for calibration?

A5: Usually pH 6.86 (neutral), pH 4.00 (acidic) or pH 9.18 (alkaline) standard buffer solutions are required. Please choose two-point calibration according to the range of the liquid to be measured.

Q6: How to deal with dirt on the electrode glass membrane?

A6: If it is inorganic salt deposits, rinse with dilute hydrochloric acid; if it is oily substances, it is recommended to wipe the wiring terminals with alcohol instead of the electrode membrane. After cleaning, reactivation in KCl solution is required.

Q7: How to troubleshoot unstable RS-485 communication?

A7: Check whether the power supply voltage is stable (12-24V), confirm whether 485A/B is reversed, and ensure that the shielding layer is reliably grounded to filter electromagnetic interference.

Q8: What are the signs of sensor failure?

A8: When the slope cannot reach the normal range during calibration, or the response time becomes extremely slow (more than 5 minutes), and cleaning and activation are ineffective, it indicates that the electrode may have failed and needs to be replaced with a new one.

Quality Commitment and Service

Aging test: Every product undergoes 72-hour high-temperature aging test to ensure circuit stability.

After-sales guarantee: One-year warranty from the date of sale.

Accessory list: Yexsensor sensor (1 pc), 5-meter shielded cable (1 pc), instruction manual, certificate of conformity.