Online pH Sensor for Water Quality HM-S3

Application Environment Description

Used for environmental water quality testing and various high/low ion strength water sample testing, it can meet the requirements of most industrial/environmental applications for online pH measurement.

Signal output: RS485 (MODBUS-RTU), 4-20mA current output.

Low impedance sensitive glass film, internal signal isolation technology, strong anti-interference ability.

Good reproducibility, thermal stability, low drift, small size, fast response speed

Easy to install, simple, 3/4NPT pipe thread, easy to sink or install in pipelines and tanks, stable performance, long service life

IP68 waterproof standard

Technical Specifications

Measurement principle: electrochemistry (salt bridge)

Signal mode: RS485 (MODBUS-RTU)

Measurement range: 0-14.00 (PH)

Measurement resolution: 0.01

Measurement accuracy: ± 0.1PH, ± 0.1 ℃

Response time: approximately 10 seconds (98% flowing liquid) and approximately 15 seconds (98% stationary liquid)

Shell material: ABS

Temperature compensation: automatic temperature compensation

Cable length: standard 5 meters

Supply voltage: 12-24VDC( 0.4W@12V )

Measurement environment: temperature 0~50 ℃ (non freezing),<0.2MPa

Waterproof rating: IP68

Installation method: Immersion installation, NPT3/4 thread

Installation and electrical connections

1. Installation

Attention: The sensor should not be installed upside down or horizontally, and should be installed at an angle of at least 15 degrees.

2. Electrical connection

The cable is a 5-core shielded wire, and the line sequence is defined as follows:

Brown - Power cord (12~24VDC) Black - Ground wire (GND)

Green -485B Yellow -485A

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

Maintenance and upkeep

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 measured liquid. One third of the sensor should be inserted into the measured 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.

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