This document describes the TEKNA DPG electromagnetic dosing pump, a device designed for precise chemical dosing in various applications. The pump is controlled by a digital system, allowing for proportional operation.
Function Description
The TEKNA DPG is an electromagnetic dosing pump that precisely injects chemicals into a system. It is designed to operate in both constant and proportional modes, offering flexibility for different dosing requirements. The pump utilizes an electromagnetic drive to actuate a diaphragm, which draws in and expels the dosing liquid. This method ensures accurate and repeatable dosing. The device is equipped with a control panel for programming and monitoring, allowing users to set flow rates, operating modes, and view operational status.
Important Technical Specifications
The TEKNA DPG series offers various models with different performance characteristics. Key specifications include:
- Flow Rate: Models vary in maximum flow rate, typically measured in liters per hour (l/h) or gallons per hour (Gph). For example, the DPG902 series offers flow rates up to 15 l/h (3.96 Gph) at 2 bars, while the DPG904 series can reach up to 100 l/h (26.4 Gph) at 0 bars.
- Pressure: The pumps are designed to operate against various back pressures, ranging from 0 to 20 bars, depending on the specific model. For instance, the DPG902 can operate up to 20 bars, while higher flow rate models like the DPG904 typically have lower maximum pressure ratings.
- Power Supply: The pumps generally operate on 230 VAC, 50/60 Hz, with power consumption around 20 W.
- Materials of Construction: The pump head and connectors are made of Polypropylene (PP), while the diaphragm is made of PTFE (Teflon). Spherical valves are made of PYREX (glass, for chemical resistance). These materials ensure compatibility with a wide range of chemicals.
- Ingress Protection: The device is rated IP65, indicating protection against dust and low-pressure water jets, making it suitable for industrial environments.
- External Control: The pump supports external control signals, including frequency input from a water meter (pulse sender) and level probes, enabling automated dosing based on flow or liquid level.
Usage Features
The TEKNA DPG pump offers several features to enhance usability and control:
- Operating Modes:
- Constant Mode: The pump doses at a fixed rate, regardless of external signals. The flow rate can be adjusted manually.
- Proportional Mode: The pump's dosing rate is proportional to an external signal, typically from a water meter or a 0/4-20 mA input. This allows for dynamic dosing based on system requirements.
- Mode 1:n: Doses 'n' strokes for each pulse received from an external water meter.
- Mode n:1: Doses 1 stroke for every 'n' pulses received from an external water meter.
- Mode 0/4—20: Doses proportionally to a 0/4-20 mA input signal.
- Priming: The pump can be manually primed to ensure it is filled with liquid and ready for operation, expelling any trapped air.
- Flow Rate Adjustment: The flow rate can be precisely adjusted using the control panel, either as a percentage of the maximum flow rate or by setting specific stroke frequencies.
- Level Control: The pump can be connected to a level probe to stop dosing when the chemical tank is empty, preventing dry running and potential damage.
- Memory Function: The pump stores the number of strokes dosed, which can be useful for monitoring chemical consumption. It also has an alarm function for memory overflow.
- Mounting Options: The pump can be mounted directly on a wall using a bracket or placed on a flat surface. For optimal performance, it is recommended to install the pump at a lower level than the dosing tank to ensure continuous liquid supply and prevent air bubbles.
- Hydraulic Connections: The manual provides detailed diagrams for connecting the suction and injection lines, including the foot filter, injection valve, and transparent tubing. It emphasizes the importance of using appropriate tubing for different chemicals and protecting tubing from direct sunlight.
Maintenance Features
Regular maintenance is crucial for the longevity and reliable operation of the TEKNA DPG pump:
- Chemical Compatibility: Always ensure that the pump's materials are compatible with the chemical being dosed. Incompatible chemicals can lead to corrosion, leaks, and pump failure. Special attention should be paid to concentrated sulfuric acid (H2SO4), as it can cause a dangerous reaction with residual water in the hydraulic part.
- Cleaning: Regularly clean the pump and its components, especially the foot filter, to prevent blockages and maintain optimal performance.
- Filter Maintenance: The suction line includes a foot filter that should be regularly inspected and cleaned to prevent impurities from entering the pump.
- Air Removal: Periodically check for and remove any air trapped in the suction line or pump head, as air can interfere with accurate dosing.
- Component Replacement: The manual provides instructions for replacing key components such as the diaphragm, valves, and tubing. It is recommended to use original spare parts.
- Winterization: If the pump is exposed to freezing temperatures, it should be drained or protected to prevent damage from ice expansion.
- Troubleshooting and Alarms: The pump's control panel displays alarm signals (e.g., low level, memory full, pump stopped) to indicate operational issues. The manual provides guidance on interpreting these alarms and taking corrective actions. For example, a "Level" alarm indicates the dosing liquid has reached the minimum level, requiring resupply. A "Memory" alarm indicates the memory is full or exhausted, requiring a reset or investigation.
- Safety Precautions: Always wear appropriate personal protective equipment (gloves, protective clothing, glasses) when handling chemicals and performing maintenance. Disconnect the pump from the power supply before any maintenance or repair work.
The TEKNA DPG is a robust and versatile dosing pump designed for precise and reliable chemical injection, with features that support both manual and automated control, and clear guidelines for maintenance to ensure long-term operation.
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