1. Product Introductions

 The Ammonia Sensor is a digital sensor featuring an easy-to-integrate RS485 communication interface and standard Modbus protocol, It is equipped with a corrosion-resistant housing, IP68 protection rating, suitable for operation in various harsh working environments;

 Utilize high-stability industrial-grade online ion-selective electrodes, which require no reagents, eliminate secondary contamination, and feature minimal maintenance requirements with low operational costs

2. Operation Principle

The suspended solids sensor operates based on the combined infrared absorption and scattering method. Infrared light emitted by the source is scattered by suspended particles in the sample, then converted into an electrical signal by a photoelectric detector. The signal undergoes analog and digital processing to determine the suspended solids concentration.

3. Electrical Connection

The cable is a 4-core twisted-pair shielded wire with the following pinout:

 White wire: 485B

Before energizing the device, thoroughly verify the wiring sequence to prevent damage resulting from incorrect connections.

Given that the cables may be submerged in water (including seawater) or exposed to air for  extended periods, they must possess corrosion-resistant properties. Additionally, all connection points must undergo waterproof sealing to ensure long-term reliability.

4. Maintenance and Servicing

 Before testing, the electrode should be soaked in activation solution for 24 hours to complete activation, then thoroughly rinsed with deionized water. If the electrode is not in use for an extended period (over two weeks), it must be stored dry, and the sensing component should be covered with a protective cap

 Check whether the terminals are dry. If contaminated, clean them with anhydrous alcohol and dry thoroughly before use. Avoid prolonged immersion in distilled water or protein solutions, and prevent contact with silicone-based oils. For electrodes with extended use, if the PVC membrane becomes translucent or accumulates deposits, rinse with distilled water (or deionized water). If measurement errors occur due to prolonged electrode usage, perform calibration.

 If calibration and measurement remain impossible after performing the above maintenance and care procedures, this indicates that the electrode has failed and should be replaced

 Primary interfering ions are listed in the table below：

5. Sensor Calibration

 Zero Point Calibration
Immerse the sensor in a vial containing the zero-point standard solution. Wait for 5 minutes until the reading stabilizes, then check if the displayed value falls within the allowable error margin. If not, perform zero-point calibration (refer to the appendix for calibration instructions)
 Slope Calibration
Immerse the sensor in a vial containing the slope standard solution. Wait for 5 minutes until the reading stabilizes, then check if the displayed value falls within the allowable error margin. If not, perform slope calibration (refer to the appendix for calibration instructions)