Proximity Sensors can be provided on almost any Yamada pump. They are used to send a signal every time the pump completes a cycle. This signal can then be used to count cycles for preventative maintenance. It can also be used to monitor flow rate. When used for one of these purposes the signal is usually sent to a basic digital counter that has no control capability. In addition to giving a totalized readout in cycles it will also be able to totalize in any engineered unit, such as gallons, cubic feet, cubic meters, liters, etc. Most basic counters will also be able to give a readout in GPM, L/M, or other flow rates. When using a proximity sensor with a PLC and a solenoid in the air line you can also perform batch metering. In other words, you can pump to a predetermined amount and have the pump shut off at that predetermined amount. The proximity sensor comes in two configurations. Please consult Yamada America for more information about proximity sensors and their use. -P1 ISA 10-30VDC 3 wire unit -P2 ISA 24-240VAC 2 wire unit
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I receive many calls from end user’s telling me that their pump has failed from dry running . Upon further investigation I find out that their problem is with a competitor’s piston pump, not an air operated double diaphragm pump. For these applications we have suggested using our DRD-100 Dry Run Detector and have been receiving great results. So remember, dry run can be controlled on our pumps or the competition. Yamada makes drum pumps in 3 port sizes. The 3/8” pump is available in Aluminum and Stainless Steel. The 1/2” pump is available in Polypropylene or Kynar. The 3/4” pump is available in Polypropylene, Aluminum or Stainless Steel. All pumps come with a 2” bung fitting and fit a standard 55 gallon drum. When using a drum pump on flammable products remember to ground the barrel and the pump to eliminate state discharge. Also, when the barrel is empty they become top heavy so make sure that it is supported properly to prevent tipping over.
There seems to be some confusion regarding what center rod is used with the various diaphragms. Hopefully this article, and the chart below will add some clarity to this issue. On pumps 1/2” in size and smaller (NDP-5/DP-10/DP-15/NDP-15), regardless of the diaphragm material, the shaft length and center disk diameter will be the same. On the 3/4” and 1” pumps (NDP-20/NDP-25) the shaft length will remain the same whether you are using a rubber diaphragm or a PTFE diaphragm; although the metal pumps will use a longer center rod than the plastic pumps. The center disks will be a smaller diameter when using PTFE diaphragms, as opposed to a larger diameter for rubber diaphragms. The stroke is short when using the PTFE diaphragms, this de-stroke is accomplished by changing the thickness of the air side center disk instead of shortening the center rod. On the larger pumps the (NDP-40/50/80) PTFE center disk will be a smaller diameter than the rubber center disks. In addition, the center rod used with the PTFE diaphragm will be shorter than the center rod used with the rubber diaphragms.
All Yamada diaphragms are rated to 100 PSI maximum and in many applications are run at pressures greater than 100 PSI without incurring diaphragm damage. Even though you can run diaphragm pumps dry, it is something that you should avoid for several reasons:
In the early months of 2008 the aluminum air chamber for the NDP-20 and NDP-25 series pump was modified with a groove in order to accommodate the newly designed diaphragms from Yamada. As a reminder the new air chambers will be marked on the outside of the casting with a “G” in order to make it easier to identify.
The starting serial numbers for both size series are: NDP-20/25 B/A/S – 487505 The Buna, Neoprene, EPDM, and Viton diaphragms will have the new design with the integrated lip. PTFE, Hytrel, and Santoprene wills till use the old design but will be used in conjunction with the following o-ring |
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March 2023
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