product overview

Applied to production process control and bus monitoring in industries such as petrochemicals, pharmaceuticals, power generation, brewing, and fine chemicals, it can be equipped with extended cables or long guide rods made of various materials such as PPR, stainless steel, and stainless steel lining F4. It provides various installation forms such as pipe thread installation, flange installation, and sanitary installation to meet the installation requirements of different application environments

Product Features

The pressurized pH sensor, under the push of elastic pressure greater than 100KPa in the inner cavity, makes it difficult for the internal reference solution to seep out from the microporous salt bridge, and its forward seepage lasts for more than 20 months

The dual high resistance circuit composed of the third electrode grounded can effectively overcome interference and achieve a precise and stable measurement system

The long-term stable reference potential ensures the reliability of the measurement system, and its service life is 3-5 times that of the gel electrode

VP connector, sturdy, waterproof, and compliant with IP68 standards, ensures reliable connection between sensors and cables in harsh industrial environments

Direct installation of pipe threads, three-way installation, circulation pool, float type, etc., with various installation methods, suitable for different on-site environments

Product Technical Parameters

Shell material: PPS

Grounding electrode: 316L

Electrical interface: M27 * 2-VP-6 gold-plated connector/fixed lead optional

Process connection: M27x2、3/4NPT

Electrode insertion depth: 40 (60, 100, 150 optional)

Temperature compensation resistor: Pt1000 (can be customized with Pt100, NTC10K, etc.)

Multiple sensitive glass films to choose from

Inflation pressure: 0.1MPa, 0.25MPa, 0.4MPa, 0.6MPa, 0.8MPa

The lead method is optional:

installation diagram

1. Wiring instructions

Hosman plug wiring instructions

Please wire the Hosman plug according to the following diagram

1. Unscrew the screw and pull out the plug upwards

2. Pry open the plug and follow the wiring diagram to connect the wires.

Aluminum alloy junction box wiring instructions?

Transmitter inspection

Standard buffer solution is generally used for testing. The method is to first calibrate the neutral point (near PH7) with a standard solution with a pH of 6.86. The transmitter output should be 12mA (4-20mA) or 5mA (0-10mA), and the error can be eliminated by adjusting the positioning potentiometer. (Adjust the "O" potentiometer on the circuit, increase clockwise and decrease counterclockwise). Use PH4.01 standard solution to test the acidity point, and the transmitter output is 4.01 × 1.142+4=8.58mA (4-20mA). The error can be eliminated by adjusting the slope potentiometer. (Adjust the "S" potentiometer on the circuit) Finally, place the transmitter probe in a standard solution with pH 9.18. The transmitter output should be 9.18 × 1.142+4=14.48mA (4-20mA), and the difference between its reading and the standard is the instrument error.

Please note during inspection that when testing one solution before testing another, the probe must be cleaned with a solution with the same pH value as the solution being tested, otherwise it will introduce significant inspection errors.

Figure 3PHThe correspondence between values and input/output signals

Installment and use

1. After unpacking the instrument, check for any damage, leakage, or looseness (the reference salt bridge around the glass electrode is allowed to have salt crystallization).

2. When connecting a two-wire transmitter to a computer, adjusting a recorder, printer, or other secondary instruments, an isolated distributor or XMT or XMZ-1000 series display instrument with isolated output produced by our company must be equipped. The required 4-20mA signal is obtained from its output terminal to isolate the common ground interference between the measurement system and the output to the secondary instrument. (For a pH transmitter, the electrode system must be connected to the ground, and in order to function properly, the external connection must be suspended and well insulated from the ground. However, most computers or regulating recording instruments are grounded from the power supply, and after being directly connected to the transmitter, the transmitter's circuit is grounded to form a two-point grounding of the measurement circuit, resulting in the electrolysis of the reference electrode and failure.)

3. After the wiring is completed and checked for errors, the terminal cover and wire pressing screws of the junction box must be tightened to ensure good sealing of the junction box. When severely damp, it will cause abnormal output

4. Connect the transmitter wires (distinguish between 24V power supply and 220V power supply!)

The probe should be placed in clean water and the displayed value should be around PH7 when powered on. During transportation, bubbles may accumulate inside the glass electrode measuring bulb, resulting in abnormal output values. At this point, the sensor can be placed upright and lightly tapped on the probe part with your hand until no bubbles are visible inside the measuring bulb. If the reading is slightly lower with a little acid, it is basically normal. Do not adjust it in a hurry. Soak it for more than 24 hours to reduce and stabilize the unbalanced potential before verifying.

5. Please refer to the special instructions for inspection

6. The installation and wiring of the transmitter are shown in Figure 4 or Figure 5 (stamped type pH meter)

Figure 4: Wiring Diagram

6. Instruments should be inspected regularly according to the condition of the measured medium. If the medium condition is good, it can be inspected every six months. If scaling or pollution is severe, it should be inspected and cleaned once a month or even once or twice a week. Even if there is an automatic cleaning device, it should be checked regularly.

7. The lower end of the transmitter junction box is a reference solution high-level tank, which is connected to the measured solution through a salt bridge structure and may have slight losses. When the reference solution drops significantly, it should be replenished once every six months to a year. For those with pressure compensation devices, it should be noted that the pressure indication value should not be lower than the medium pressure to prevent reverse osmosis pollution of the reference electrode. Regular inflation and pressurization can be carried out.

★ 8. Glass electrodes are consumables with a service life of about one year. The usage time of the electrode is closely related to the water condition of the measured medium and whether the cleaning and maintenance are sufficient. If the water condition is poor or not cleaned properly, the service life of the electrode will be greatly reduced. Therefore, glass measuring electrodes are not covered by warranty.