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Product details
1. Overview
PH9108B（PH9801B）The industrial pH/ORP meter (hereinafter referred to as the instrument) is an online water quality monitoring device with a microprocessor. This instrument is equipped with different types of pH (or ORP) electrodes and is widely used in various industries such as power plants, petrochemicals, metallurgical electronics, mining, papermaking, biological fermentation processes, pharmaceuticals, food and beverage, environmental water treatment, etc. It continuously monitors and controls the pH (acidity and alkalinity) value or ORP (oxidation-reduction potential) value and temperature value of aqueous solutions. Such as power plant supply water, saturated water, condensate water, general industrial water, domestic water, and wastewater.
The instrument adopts LCD liquid crystal display screen; Intelligent Chinese menu operation; Equipped with current or voltage output, freely adjustable measurement range, high and low limit alarm prompts, and two sets of relay control switches, with adjustable hysteresis range; Automatic or manual temperature compensation; Multiple automatic calibration methods for electrodes.
According to user needs, pH (or ORP) electrodes can be installed in various forms such as flow type, sinking type, pipeline type, flange type, etc.
II. Structural Features and Working Principles
2.1 Structural Features:
The entire measurement system is mainly composed of PH9108B（PH9801B）The instrument consists of two parts: a secondary instrument and a pH (or ORP) electrode (primary instrument). The pH (or ORP) electrode is in contact with the measured aqueous solution, and the instrument displays the pH (or ORP) value, temperature value, and working status of the aqueous solution.
2.2 Working principle:
The instrument consists of signal measurement, operation, display, network communication, and panel instructions. The impedance transformation of pH and temperature transmission changes the pH to a low impedance signal of 459.16mV/pH (25 ℃); Convert NTC into a voltage signal.
The instrument is matched with a pH (or ORP) electrode to monitor the pH (or ORP) value of the solution. The sensor is a battery composed of a pH (or ORP) glass electrode and a calomel (or Ag/AgCl) reference electrode, which generates a potential difference related to the pH value of the solution based on the Nernst equation: Ex=Eo+SpH.
The potential difference is amplified by a preamplifier with high input impedance, and the thermistor sends out a signal corresponding to the temperature value. After amplification, the two sets of signals are converted from A/D and processed by an I/O interface chip through a single-chip microprocessor before being prominently displayed on the display screen.
Three technical parameters
(1) Measurement range: pH: 0.01-14.00pH; ORP：－1999～＋1999mV；
Temperature: -5~110.0 ℃;
（2）分辨率： pH：0.01pH； ORP：1mV；
(3) Basic error: pH: ± 0.1pH; ORP: ± 3mV; Temperature: ± 0.5 ℃;
(4) Automatic or manual temperature compensation range: 0-110 ℃;
(5) Stability: pH: ≤ 0.02pH/24h; ORP: ≤2mV/24h；
(6) Signal output:
0-10mA (load resistance<1.5K Ω); 4-20mA (load resistance<750 Ω);
Optional: 0-5V, 0-10V (pre order required);
(7) Two sets of relay control contacts: 3A 240VAC, 6A 28VDC or 120VAC;
(8) Power supply: 220VAC ± 10%, 50 ± 1Hz, power ≤ 3W;
(9) Dimensions: 96 × 96 × 130mm;
(10) Installation method: panel installation; Hole size: 91 × 91mm;
(11) Weight: 1.0kg;
(12) Work environment:
Environmental temperature: -10~45 ℃;
Relative humidity: not exceeding 90%;
There is no strong magnetic field interference around except for the Earth's magnetic field.
Four functional characteristics
⊙ Intelligence: Using a single-chip microprocessor to complete pH (or ORP) value measurement, temperature measurement, and compensation;
⊙ Dual high impedance preamplifier: high input impedance, anti noise, strong anti-interference ability;
⊙ There are three calibration methods: one point calibration, two-point calibration, and known concentration calibration;
⊙ Human computer dialogue: menu operation structure, users can operate according to the prompts on the screen;
⊙ Multi parameter display on the same screen: Simultaneously display pH (or ORP) value, temperature value, and working status;
⊙ Software setting output mode: The software selects 0-10mA or 4-20mA output;
⊙ The measurement range and alarm upper and lower limits can be freely set; Alarm prompt for upper and lower limit exceeding limits;
⊙ Two sets of relay control switches, with adjustable hysteresis control range;
⊙ Self set password: Users can set or modify their own password to prevent unauthorized personnel from entering and causing misoperation;
⊙ After sales service: Provide technical support and contact information for after-sales service to users;
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