FOXBORO 870ITEC-AYFNZ-7 Intelligent Electrochemical Transmitter

FOXBORO 870ITEC-AYFNZ-7 Intelligent Electrochemical Transmitter

Product Overview

The FOXBORO 870ITEC-AYFNZ-7 intelligent electrochemical transmitter is a high-precision sensing device designed by Foxboro specifically for monitoring electrochemical parameters such as ion concentration, pH value, and oxidation-reduction potential (ORP) in industrial processes. AYFNZ-7 is its exclusive configuration identifier. This device is based on electrochemical sensing technology and integrates intelligent signal processing and wireless communication functions. It can be directly adapted to various electrochemical sensors to achieve real-time acquisition, accurate conversion, and reliable transmission of key chemical parameters in liquid media.

As the core component of industrial process water quality monitoring and chemical reaction control, it adopts a corrosion-resistant shell and anti-interference circuit design, which can work stably in acid-base corrosion, high temperature and humidity environments in industries such as chemical, water treatment, and pharmaceuticals. Through seamless integration with DCS systems or industrial IoT platforms, remote monitoring of measurement data, parameter configuration, and fault warning can be achieved, providing accurate data support for quality control and safety assurance in the production process.

Specification parameters

Core functionality

Electrochemical parameter measurement (pH/ORP/ion concentration), signal conversion, wireless data transmission, fault diagnosis, remote configuration

measurement range

PH value: 0-14PH; ORP: -1500mV~+1500mV; Ionic concentration: 0.01ppm~10000ppm (depending on sensor type)

Measurement performance

Accuracy: pH ± 0.01pH, ORP ± 1mV, ion concentration ± 0.5% FS; Resolution: pH 0.001PH, ORP.1mV, ion concentration 0.001ppm; Response time: ≤ 2s (90% step response)

Sensor adaptation

Support glass electrode (pH), metal electrode (ORP), and ion selective electrode; Input impedance: ≥ 10 ¹² Ω; Sensor power supply: 5VDC ± 0.1V

Output and Communication

Analog output: 4-20mA DC (load 0-1000 Ω); Digital output: RS485 (Modbus RTU), LoRa/WiFi (wireless optional); Communication speed: 9600-115200bps adjustable

working power supply

Power supply mode: 24VDC ± 10% (wired), lithium battery 3.6V/10Ah (wireless, with a battery life of ≥ 12 months); Maximum power consumption: ≤ 5W (wired), ≤ 0.1W (wireless sleep)

environmental parameters

Working temperature: -10 ℃ -60 ℃; Storage temperature: -40 ℃ -85 ℃; Relative humidity: 0% -95% (no condensation); Protection level: IP67 (body), IP68 (sensor probe)

Physics and Authentication

Size: 120mm (diameter) x 250mm (height); Shell material: 316L stainless steel; Installation method: pipe insertion/wall mounted; Certification: ATEX Zone 1, IEC 61326-1, UL 61010-1

Performance characteristics

-High precision electrochemical measurement: using high input impedance signal conditioning circuit and temperature compensation technology, effectively offsetting the influence of electrode drift and environmental temperature on measurement. The pH measurement accuracy reaches ± 0.01pH, which can meet the strict requirements of GMP certification for water quality monitoring in the pharmaceutical industry. By combining the specific response of ion selective electrodes, precise quantitative measurement of target ions can be achieved.

-Intelligent self diagnosis and calibration: Equipped with built-in sensor performance monitoring function, it can diagnose electrode contamination, aging, wire breakage and other faults in real time, and provide dual alarms through local indicator lights and remote signals; Support manual single point/two-point calibration and automatic calibration (with standard solution pool required), automatic storage of calibration data to prevent accidental loss.

-Flexible communication and integration: Combining wired and wireless communication modes, the wireless version supports LoRa long-distance transmission (open distance ≥ 3km), suitable for industrial IoT scenarios; It can be directly connected to Foxboro I/A Series DCS and third-party SCADA systems, supporting real-time uploading of measurement data and equipment status.

-Strong environmental adaptability: The body adopts 316L stainless steel shell and fluororubber seal, which is resistant to acid and alkali solution corrosion; The sensor probe is made of sapphire glass or polytetrafluoroethylene material, which can work stably in the temperature range of -10 ℃ -60 ℃, with a protection level of IP68, suitable for immersion measurement.

-Convenient operation and configuration: supports parameter configuration through on-site buttons, infrared remote control, and upper computer software; The wireless version has a low battery warning function, and the lithium battery can be replaced on site without disconnecting the wires; Modular design facilitates separate maintenance and replacement of sensors.

Working principle

FOXBORO 870ITEC-AYFNZ-7 is based on electrochemical sensing and signal intelligent processing technology, and achieves parameter measurement through the core process of "ion response signal conversion data operation transmission feedback". The specific mechanism is as follows:

1. Electrochemical signal generation: When the sensor probe (such as pH glass electrode) comes into contact with the measured liquid, an ion exchange reaction occurs on the electrode surface, which generates a potential signal related to the concentration of the measured parameter based on the Nernst equation. For example, the pH electrode converts the pH value of the solution into a millivolt level potential signal through H ⁺ ion selective response.

2. Signal conditioning and conversion: The high impedance input circuit collects weak potential signals without distortion, removes electromagnetic interference through multi-stage filtering, and sends them to a 16 bit AD conversion chip to convert analog signals into digital signals. At the same time, the temperature sensor collects the ambient temperature to provide data support for subsequent temperature compensation.

3. Data operation and compensation: The core microprocessor calls built-in algorithms and combines temperature compensation models to correct the impact of temperature on measurement results, converting digital signals into intuitive pH values, ORP or ion concentration values. Simultaneously compare with the preset calibration parameters to ensure measurement accuracy.

4. Fault diagnosis and data transmission: The microprocessor monitors the sensor impedance, signal stability, and its own working status in real time, and triggers a fault alarm when an abnormality is detected; The measurement data and equipment status are transmitted to the higher-level system through analog output or wireless/wired digital communication modules, while receiving remote calibration and configuration instructions.

Precautions

1. Installation and configuration precautions

-The sensor probe should be inserted vertically into the measured medium at a depth of ≥ 100mm, avoiding installation in turbulent areas such as pipeline bends and pump outlets to prevent bubble adhesion from affecting the measurement; When installing on a wall, the transmitter body should be higher than the sensor to prevent condensation from flowing into the interior of the equipment.

-Before configuration, it is necessary to clarify the sensor type and measurement range, and match the corresponding parameter model through software; The calibration threshold setting should be combined with process requirements, for example, pH control in chemical reaction vessels usually requires setting upper and lower limit alarms (such as 2-12pH) and reserving safety margins.

-When installing the wireless version, it is necessary to avoid metal shielding and strong electromagnetic interference sources (such as frequency converters) to ensure that the communication signal strength is ≥ -80dBm; Before installing lithium batteries, it is necessary to confirm the positive and negative polarity, and short circuits are strictly prohibited. When replacing them, original batteries of the same model must be used.

2. Precautions for wiring and debugging

-Before wiring, the power supply of the transmitter must be cut off. The sensor cable needs to use a dedicated shielded wire, and the shielding layer should be grounded at one end (on the control room side); The power line and signal line are laid separately with a spacing of ≥ 200mm to avoid electromagnetic interference causing signal fluctuations.

-Before debugging, sensor activation treatment is required (soak the new electrode in 3M KCl solution for ≥ 24 hours); Calibration requires the use of standard buffer solution, and pH calibration should use at least two-point calibration (such as 4.00pH, 6.86pH, 9.18pH). During the calibration process, ensure that the electrode is completely submerged and free of bubbles.

-During system debugging, it is necessary to verify the consistency between the measurement data and the standard instrument, and the error should be controlled within the accuracy range; When testing the alarm function, the upper and lower limit alarms are triggered by adjusting the standard solution parameters to confirm the timeliness of the remote system receiving the alarm signal.

3. Precautions for operation and maintenance

-Regularly clean the sensor probe, remove surface dirt and scale, use a soft bristled brush and neutral detergent during cleaning to avoid scratching the electrode membrane; For easily contaminated media (such as sewage), it is recommended to equip with an automatic cleaning device, and the cleaning cycle should be set according to the degree of pollution (usually 1-7 days).

-Check the tightness of cable connections and the sealing of the casing once a month, especially to prevent water infiltration in humid environments; The wireless version checks the battery level through the upper computer every week. If the battery level drops below 20%, it should be replaced in a timely manner. After replacement, the communication status needs to be confirmed again.

-The service life of sensors is usually 6-12 months, and they need to be calibrated and verified for performance before expiration. If the error exceeds the allowable range, they need to be replaced; When there is a transmitter malfunction, it is necessary to first investigate the sensor and wiring issues. After confirming that it is an equipment malfunction, contact professional personnel for repair. It is prohibited to disassemble it by oneself.