The instrument mainly consists of an electronic unit, namely the secondary meter as shown in Figure 1, and an electrode, namely the pH electrode of the primary meter, connected by a dedicated electrode cable.

The electronic unit displays the measured pH value (mV value when configuring ORP electrode) and temperature value, and has

Multiple functions of operation buttons and instruments.

pHThere are many types of electrodes, and the pH electrode is a conventional triple composite electrode consisting of a reference electrode, an indicator electrode, and a temperature electrode, which are integrated into a single structure.

Brief measurement principle: The electronic unit (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 pH electrode of the instrument and sensor is matched to monitor the pH value of the solution. The sensor is a battery composed of a pH 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 stage with high input impedance, and the thermistor sends out a signal corresponding to the temperature value. After amplification, the two signals are converted from A/D and processed by an I/O interface chip. After being processed by a single-chip microprocessor, they are prominently displayed on the display screen.

• Intelligent type: using a single-chip microprocessor to complete pH or mV value measurement and temperature measurement.

• Human computer dialogue interface: menu operation structure, users can operate according to the prompts on the screen.

• Networked: capable of remote transmission, monitoring, and control.

• Isolation output current: The software selects either 0-10mA or 4-20mA output.

• Measurement range: The upper and lower limit parameters can be freely set corresponding to the output current.

• The upper and lower limit over limit alarms can be set arbitrarily, and over limit alarms will flash to indicate the measurement status.

• Two sets of relay control, adjustable hysteresis, can be connected to external control devices such as metering pumps and solenoid valves, and implement automatic dosing and other controls Self set password, users can set or modify their own password to prevent unauthorized personnel from entering and causing misoperation; And it can help you retrieve your forgotten instrument password; We also provide users with contact information for technical consultation and after-sales service.

• It has multiple calibration functions including one point calibration, two-point calibration, and known concentration calibration; Correction functions such as measurement errors.

• According to the user's order statement, RS485//RS232 communication interface (communication protocol CD provided) can be provided.

• According to the user's order statement, a 24VDC power supply can be provided.

• According to the user's project requirements for export abroad, the ordering statement can provide: English version including software menu, operation panel, manual, etc. of the instrument.

pHAcidity meter monitoring and control instrument, hereinafter referred to as instrument (all compatible with ORP), is widely used in water industries such as power plants, thermal power plants, petrochemicals, metallurgical electronics, mining and paper industries, environmental water treatment, biological fermentation, medicine, food and beverage, etc., to continuously monitor the acidity and alkalinity of aqueous solutions. Suitable for high-purity water, pure water, etc., such as power plant supply water, saturated water, condensate water, and boiler water, etc; More suitable for general industrial water, domestic water, and wastewater; And industries such as biotechnology fermentation.

This series of instrument products are industrial online, optimized design, and use high-quality chip components in the form of surface mount; Adopting microprocessors, intelligent networking, and menu based operations; Equipped with functions such as isolated output current, relay output, and communication interface; Configure various pH electrodes for online continuous measurement and control.