For each metering pump and its identification code, a detailed explanation is given in the ProMinent® catalog. By querying the identification code, the corresponding option can be selected for a specific metering pump. What are the most basic accessory packages? Included in the accessory kit are a foot valve, injection valve, 2-meter pipette and 5-meter drain line. Which parts are included in a complete metering pump head? A complete hydraulic end consists of the following components: pump head, diaphragm, valve, back plate and mounting bolts. What is the main purpose of the end valve? The bottom valve itself has a weight that holds the aspiration line straight and allows the aspiration line to be perpendicular to the chemical cartridge. In addition it is also a check valve to maintain the positive flow of chemical liquid. The bottom valve also helps to improve pump repeatability and normal pipetting. A screen inside the bottom valve prevents solid particles from being aspirated into the pipetting line. Ingestion of small solid particles may cause the diaphragm of the metering pump to break. The foot valve also includes a connector for connecting the pipette. The bottom valve should be mounted vertically and keep the bottom valve at a distance from the bottom of the reservoir. For most self-priming metering pump bottom valve selection is very necessary. What is the main purpose of injection valve? Injection valves are used for the connection of the drain line to the injection point. Injection valves can not be used as isolation devices or as siphon protection. In applications where the requirement is not too high, the injection valve can generate a back pressure of 0.5 bar. What is the main purpose of rinsing equipment? Flushing equipment is used to clean the metering pump head and drain lines. Mainly used in the measurement of chemical easily solidified or metering pump often need to be idle. What is the float switch, its main role is what? Float switch is to control the storage tank level is a very critical equipment. When the level drops, the float sinks and the contacts in the switch close. This contact can be used to control the metering pump, for example to stop the metering pump 1 and start the metering pump 2, or to turn the alarm / indicator light on air. By reversing the float, the float switch can be applied to the collection tank, indicating that the collection tank is full and the metering pump is stopped. What is the difference between single stage float switch and two stage float switch? When switching, the single stage float switch stops the metering pump directly. For a two-stage float switch, activating the first stage can be used to alert the reservoir to indicate the low level. When the second level switch is activated, the metering pump stops. What is a multi-function valve? Multi-function valve is a very versatile product, it can produce a constant back pressure, to ensure repeatable measurement accuracy. Anti-siphon valves are integrated into the device to prevent chemicals from being drawn into the vacuum line and to prevent Venturi effects or negative delivery indenters in the water circuit. Pressure relief valves are integrated within the device to protect metering pumps, pipelines and other system equipment from system overpressure and prevent over-pressurization. The multi-function valve is also integrated with a pilot valve function, which can release the pressure of the drainage line to help dosing pump. The multi-function valve allows the discharged liquid to safely flow back into the vat. What is the main function of the traffic monitor? Flow monitoring utilizes proximity switches that are activated at each flow pulse. The dosing pump compares the drain stroke with the number of pulses monitored by the flow rate. If 8 consecutive strokes or set the number of strokes, the pump can not detect the corresponding pulse signal, the metering pump stopped and issued a fault indication. In the absence of pipetting lines, clogged or leaky, drained lines, broken membranes, etc., the flow monitor can send an alarm signal by not detecting a pulse signal. The proportional flow monitor can detect if the metered flow drops 20% or below the set value. Fault alarm relay and step relay what is the main purpose? Alarm relay contacts are open (NC) or closed (NO) when the dosing pump fails. The synchronization relay closes when the dosing pump fails, and usually the synchronous relay is attached to the dosing pump to produce the same frequency as the main dosing pump. What is the main use of pulse dampers? Choosing the right size pulsation dampener can reduce pulsations by 90% or more, resulting in a flow close to laminar flow. Pulse dampers reduce the acceleration of the metered medium and reduce head losses. What is the difference between the function of the buffer and the pulse damper? The bumper reduces the pulsation of the line while reducing the acceleration of the medium and reducing the head loss. The buffer liquid and gas are not separated. The bumper cavity will eventually fill with liquid, and the liquid needs to be drained off. What is a diaphragm rupture monitor and how does it work? There is a leakage discharge hole on the back plate between the driving end and the pump head, and a conduit connects the leakage discharge hole to a small cylinder. If the diaphragm ruptures, the liquid drains through the drain hole into the small cylinder. Small cylinder has a float switch inside, as long as the cylinder has 10ml of liquid, the float switch can be activated. Switch contacts can be set to normally open or normally closed. 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