Online Residual Chlorine Sensor HM-S4

Application Environment Description

Used for continuous monitoring of residual chlorine content in water solutions in drinking water treatment plants, canning plants, drinking water distribution networks, swimming pools, cooling circulating water, water quality treatment projects, and other occasions.

Technical parameters

PH sensor:

Range and Resolution: 0~14 (PH), 0.01

Accuracy: ± 0.1PH; ± 0.3 ℃

Residual chlorine sensor:

Range and Resolution: 0~5.00 mg/L, 0.01

Accuracy: ± 5% of the reading; ±0.3℃

Communication method: RS485 (MODBUS-RTU)

Shell material: ABS

Temperature compensation: automatic temperature compensation

PH compensation: automatic PH compensation

Cable length: standard 5 meters

Supply voltage: 12-24VDC( 0.3W@12V )

Waterproof rating: IP68

Installation method: Flow pool installation, 3/4NPT

Electrical connection

1. Installation

Install the matching flow tank, with the sensor tightly attached to the flow tank. Ensure that the sensor measuring part is placed near the inlet of the flow tank, and avoid facing the outlet as much as possible to ensure a stable flow rate. It is recommended to control the flow rate at 30-60L/h to ensure the accuracy of the test.

2. Electrical connection

The cable is a 4-core twisted pair shielded wire, and the line sequence is defined as follows:

Red wire - power cord (12-24VDC) l

Black wire - Ground wire (GND)

Blue line -485A

Green line -485B

Note: The color of the cable may vary slightly depending on the production batch, and the specific color is subject to the cable silk screen printing.

Before powering on, carefully check the wiring sequence to avoid unnecessary losses caused by wiring errors.

Maintenance and upkeep

1. PH electrode

When used for the first time or left unused for a long time, the sensitive bulb and reference liquid should be immersed in a 3.3mol/L KCI solution for more than 2 hours. Before use, rinse and dry with deionized water (or distilled water) to prevent impurities from entering the tested liquid.

The wiring terminal should be kept clean and dry, and the sensor should be cleaned when not in use. It should be inserted into a protective sleeve containing 3.3mol/L KCI solution or into a container containing 3.3mol/L KCI solution.

Check if the wiring terminals are dry. If there are stains, please wipe them with anhydrous alcohol and let them dry before continuing to use. Sensors should avoid prolonged immersion in deionized water, protein solutions, strong acid and alkali solutions, and acidic fluoride solutions, and prevent contact with organic silicone oils and fats. Sensors that have been used for a long time may have their glass film become semi transparent or have sediment attached. In this case, dilute hydrochloric acid can be used to wash and rinse with water.

When the sensor has been used for a long time and measurement errors occur, it can be calibrated and corrected by cooperating with the instrument. If the above methods of maintenance and upkeep still cannot calibrate and measure the sensor, it indicates that the sensor has failed and should be replaced.

2. Residual chlorine electrode

New electrodes and electrodes that have been placed for a long time need to be activated before use. The sensor should be left to stand in tap water for 24 hours. If the returned value is inaccurate, the following operations need to be performed:

Perform zero and slope calibration on the sensor

Return to factory inspection

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