Each metering pump is designed to measure and deliver a specific volume of fluid based on its capacity. The flow rate of the pump is directly proportional to the effective diaphragm area, the stroke length (L), and the stroke frequency (F), following the relationship: V ∝ A × F × L. This means that by adjusting either the stroke length or the frequency, the output flow can be precisely controlled. In various operational conditions, such as different medium types and working pressures, both the stroke length and frequency can be adjusted to achieve two-dimensional control over the pump’s output. In practical engineering applications, stroke length is typically used as a coarse adjustment parameter, while stroke frequency serves as a fine-tuned variable. This approach allows for greater flexibility in regulation. For simpler systems, the stroke length can even be set manually, with only the frequency acting as the control variable, thus simplifying the overall system design. Metering pumps often use analog or switch signals for control. The 0/4-20mA current signal is widely used in industrial process control as a standard communication method between sensors, controllers, and actuators. Many metering pumps with external control capabilities rely on this signal to adjust both the stroke frequency and stroke length. Position servos are the most common method for adjusting the stroke length. These integrated servos receive 0/4-20mA control signals directly from a controller or computer, allowing automatic adjustment of the stroke length from 0% to 100%. Stroke frequency adjustments can be achieved through several methods, including inverter motor control and relay contact control. Variable frequency drives (VFDs) can regulate the motor speed using a 0/4-20mA signal, thereby controlling the stroke frequency. For solenoid-driven or partially motor-driven pumps, external contact signals can also be used to adjust the frequency. In certain specialized applications, such as pH control, metering pumps act as actuators that add acid or base under the guidance of a controller. To enhance reliability and simplify the system, some pumps integrate microprocessor-based control systems. This allows the pump to operate independently with just a sensor input, making it ideal for monitoring parameters like ORP or residual chlorine. Many modern metering pumps now feature programmable control options. With an internal microprocessor, these pumps can perform real-time dosing, adjust flow rates, and execute pre-set programs. They support quantitative dosing, time-based triggering, event-based triggering, and hybrid modes. They also display total fluid delivered, remaining strokes, and other critical operational data. For example, in a cooling tower water treatment system, the pump can dose disinfectant proportionally to the water flow and schedule additional doses at specific times, such as on Fridays between 12 and 1 PM. This level of customization makes complex dosing tasks straightforward and accurate. In large-scale automation systems, such as those found in the petrochemical industry, fieldbus protocols like ProFibus are commonly used. ProFibus supports high-speed data transmission between devices, forming a reliable networked control system. It includes three variants: ProFibus-DP, ProFibus-PA, and ProFibus-FMS. ProFibus-DP is particularly suited for process control and decentralized peripherals, offering fast and reliable communication via twisted pair or fiber optics. The streamlined instruction set of ProFibus makes programming easy. Pumps equipped with this protocol can seamlessly integrate into advanced control systems, maximizing their performance and functionality. Products like the ProMax series offer multiple models with fieldbus capabilities, reflecting the growing trend toward precision, versatility, and intelligence in metering pump design.

Glass Convector Heater

The Glass Convection heater warm the room as it passes over a heated coil; some use a fan to forced in the cool air to heat. The heated air rises naturally or is forced out by a fan and spreads into the space to warm room.

A Glassl convection heater is a type of heater that uses convection currents to heat and circulate air. These currents circulate throughout the body of the appliance and across its heating element.

Glass Convector Heater including glass convection heater, Metal Convection Heater, also mini convector heater can be a Frost Heater.

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Glass Panel Convector Heater,Electric Convector Panel Heater,Mounted Glass Panel Convector Heater,Glass Panel Heater Convector Heater

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