Getting Started

First-Time Use Precautions

• Before measurement, remove the black and transparent protective sleeves from the electrode tip.
• Before using the equipment, check the tip for air bubbles. If no bubbles are present, use normally. If bubbles are present, shake the equipment downwards to remove them.

Installation Method

Submersible Installation: The sensor lead wires emerge from the waterproof conduit, and the top 3/4 thread is connected to the waterproof conduit's 3/4 thread using Teflon tape. Ensure the top of the sensor and the wires are not wetted.

Initial Calibration (If Needed)

1. This device uses two-point calibration, requiring two known ammonia nitrogen standard solutions. At room temperature (approximately 25°C), clean the device thoroughly before each calibration point, removing excess water. Place the ammonia nitrogen electrode in the standard solution with the lower ammonia nitrogen value (e.g., if using 10 mg/L and 100 mg/L solutions, select the 10 mg/L solution). After vigorously shaking the device in the standard solution to accelerate the response, allow it to stand for at least 15 minutes until the value stabilizes before performing the calibration operation. Enter the command to execute the first calibration (see the communication protocol example for detailed commands).

2. After completing the first calibration, clean the ammonia nitrogen electrode. Place the sensor in the standard solution with the higher ammonia nitrogen value (e.g., if using 10 mg/L and 100 mg/L solutions, select the 100 mg/L solution). After the ammonia nitrogen value stabilizes, enter the command to execute the second calibration (see the communication protocol example for detailed commands).
   Note: The pH electrode calibration method is the same as above.

Maintenance and Long-Term Care

◆ In case of obvious malfunction, do not attempt to repair it yourself; contact us immediately!
◆ Unused equipment should be stored in diluted standard solution.
◆ Equipment that has not been used for a long time needs to be activated by soaking before measurement. (First, perform low-concentration activation by soaking in a 10 mg/L standard solution for at least 12 hours. Then, perform high-concentration activation by soaking the equipment in a 1000 mg/L solution for 1-2 hours). After activation, thoroughly clean the equipment before testing. Immerse the tip of the equipment in deionized water for 5 minutes and agitate the solution. For a more thorough cleaning, change the deionized water several times and repeat the cleaning process to prevent measurement errors.
◆ Equipment that has not been used for a short period needs to be soaked in deionized water before calibration to prevent measurement errors.
◆ The equipment should be calibrated before each use. For long-term use in water, calibration is recommended every 2-3 weeks to ensure accuracy. The calibration frequency should be adjusted according to different application conditions (degree of contamination, chemical deposits, etc.).
◆ After use, rinse the equipment head thoroughly with clean water.
◆ Do not use this equipment in highly corrosive liquid environments to avoid damage.
◆ Do not touch the membrane head at the front of the equipment with sharp objects to avoid damage.
◆ Do not use in water containing organic solvents to avoid damage.
◆ Do not use in environments exceeding the equipment's operating temperature to avoid damage.
◆ If the on-site environment has a complex composition, the chemical components may cause the ion exchange membrane to fail.
◆ Due to the large variety and high concentration of interfering ions in seawater, it is not recommended to use this equipment in seawater.
◆ The pH electrode has a service life of approximately one year, and the ammonia nitrogen electrode has a service life of approximately 3-6 months. Replace the electrodes promptly after aging.
◆ Do not immerse the plug in water before locking the cable plug to the equipment plug.