Pump protection is a very common applications in industry. The idea behind the application is to confirm that a pump is actually pushing fluid downstream by confirming there is flow downstream or that the pump is primed or not in air lockup in the case of liquid centrifugal pumps. Some users use pressure switches for pump protection, but these can give false indications from pressure build ups in closed pipes due to temperature changes. The solution is a switch actuatuated by the fluid's actual flow downstream. This can be accomplished with either one of our proven mechanical flow switches, either vane or disc actuated, or with an ultrasonic or thermal dispersion insertion type switch.