Tag Archives: flow rate

Dave’s Corner: DP-15 Pump vs. NDP-15 Pump

When someone asks me about a Yamada 1/2” pump, most people think about the NDP-15 series pump. However, there is another option called the DP-15. This pump uses the NDP-15 polypropylene liquid side, but uses the DP-10 air section.


The DP-15 is only pump available with a polypropylene liquid end and has the same elastomer options as the NDP-15 series pumps. Be advised: there is a significant difference in the maximum flow rates. The DP-15 series has a maximum flow rate of 7.4 GPM, while the NDP-15 series has a 13.5 GPM maximum flow rate.


While the NDP-15 series is good for higher flow rates, the DP-15 is ideal for low flow rates, extended dead head and dispensing applications. Both pumps share a common liquid end kit, but require different air motor kits. The DP-15 uses a K115-AM air motor kit and the NDP-15 uses a K15-AM motor kit.

Dave’s Corner: Proximity Sensor

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

proximity sensor