POM Wetted Online ORP Meter with Double High Impedance and IP68 Protection for Industrial Water Quality Monitoring

Used in environmental water quality monitoring, acid/alkali/salt solution, chemical reaction process, industrial production process, it can meet the requirements of online ORP measurement for most industrial applications.

• Signal output: RS-485 (Modbus/RTU protocol).
• Convenient connection to third-party equipment such as PLC, DCS, industrial control computer, general controller, paperless recording instrument or touch screen.
• Double high-impedance differential amplifier with strong anti-interference and fast response.
• The patented ORP electrode, the internal reference solution oozes extremely slowly from the microporous salt bridge under the pressure of at least 100KPa (1Bar), and its forward bleed continues for more than 20 months. Such a reference system is very stable and the electrode life is extended by a factor of two compared to conventional industrial electrodes.
• Easy to install: 3/4 NPT pipe thread for easy submersible installation or installation in pipes and tanks.
• IP68 protection level.

Note:The sensor connector is m16-5 core waterproof connector male.

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

• a) Red line - power cord (12 ~ 24V)
• b) Black line - ground (GND)
• c) Blue line - 485A
• d) white line - 485B
• e) bare wire - shielded wire

After wiring is completed, it should be carefully checked to avoid incorrect connections before powering up.

Cable specification: Considering that the cable is immersed in water (including sea water) for a long time or exposed to the air, the cable has certain corrosion resistance. The outer diameter of the cable is Φ6 mm and all interfaces are waterproof.

When measuring the ORP electrode, it should be cleaned in distilled water (or deionized water) first, and the filter paper should be used to absorb moisture to prevent impurities from being introduced into the liquid to be tested. 1/3 of the electrode should be inserted into the solution to be tested.

The electrode should be washed when not in use, inserted into a protective cover with a 3.5 mol/L potassium chloride solution, or inserted into a container with a 3.5 mol/L potassium chloride solution.

Check if the terminal is dry. If it is stained, wipe it with absolute alcohol and dry it. Avoid long-term immersion in distilled water or protein solution and prevent contact with silicone grease. With a longer electrode, its glass film may become translucent or with deposits, which can be washed with dilute hydrochloric acid and rinsed with water. The electrode is used for a long time. When a measurement error occurs, it must be calibrated with the meter to correct it.

When the calibration and measurement cannot be performed while maintaining and maintaining the electrode in the above manner, the electrode has failed. Please replace the electrode.

1. a) ORP standard solution 256mV preparation method

2.1 g of hydrazine was weighed into 200 mL of a standard pH buffer solution having a pH of 4.00 and mixed.

2. b) ORP standard solution 86mV preparation method

Weigh 2.1 g of hydrazine to 200 mL of a standard pH buffer solution with a pH of 6.86 and mix.

3. c) ORP standard solution -40mV preparation method

Weigh 2.1 g of hydrazine to 200 mL of a standard pH buffer solution with a pH of 9.18 and mix.

Note that when preparing the pH, a total of 250 mL is prepared, and 200 mL is used for use.

pH to prepare the corresponding standard solution method:

Take 250mL of distilled water from a measuring cylinder, pour it into a beaker, add a packet of calibration powder with pH=6.86/4.00/9.18, stir evenly with a glass rod until the powder is completely dissolved, and prepare a solution with pH=6.86/4.00/9.18.

Place the sensor in the prepared 86mV (or 256mV or -40mV) solution and wait for 3 to 5 minutes. After the value is stable, see if the displayed value is 86mV (or 256mV or -40mV). If not, calibration is required. See the appendix for calibration instructions.

• The quality inspection department has standardized inspection procedures, advanced and perfect testing equipment and means, and strictly in accordance with the regulations, to do 72-hour aging test and stability test on the product, and not to allow one unqualified product to leave the factory.
• The receiving party directly returns the product batch with a failure rate of 2%, and all the costs incurred are borne by the supplier. The reference standard refers to the product description provided by the supplier.
• Guarantee the quantity of goods and the speed of shipment.

This product includes:

• 1 sensor
• 1 copy of the manual
• 1 certificate

The company provides local after-sales service within one year from the date of sale, but does not include damage caused by improper use. If repair or adjustment is required, please return it, but the shipping cost must be conceited. Damaged on the way, the company will repair the damage of the instrument for free.