Dave’s Corner – Page 5 – Yamada Pump Blog

In August of 2008 the NDP-20 / NDP-25 series pumps came with a new style diaphragm which has an o-ring molded into the air side. This change was made for two reasons:

To prevent air leaks where the diaphragm contacts the air chamber. To prevent a diaphragm from pulling out of place if there is excessive air pressure.

On the thermoplastic diaphragms (TPO, TPE, PTFE), there is no o-ring molded in the diaphragm. Instead a separate o-ring is used to fill the o’ring groove in the air chamber wall.

The new style diaphragms cannot be used in the old style pumps, however the old style diaphragms can be used in the new style pump when used with the air chamber wall o-ring. The old style diaphragm will continue to be available for a few more years.

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

Category: Dave’s Corner

Dave’s Corner: Diaphragm for NDP-20/25 Series Pumps

Dave’s Corner: Proximity Sensor

Enjoy this blog? Please spread the word :)