Abstract: Various embodiments of the teachings herein include a pulse counter for fluid pressure changes. The pulse counter may include: a first and a second housing part with a fluid passage; a circuit board at least partially enclosed within the housing, the circuit board comprising a light pulse transmitter and a light pulse receiver; a battery at least partially within the housing, the battery supplying electric power to the light pulse transmitter and the light pulse receiver; a rod slidably arranged within the housing, with one end of the rod within the fluid passage, and a second end arranged at least partly breaking a light pulse between the light pulse transmitter and the light pulse receiver; and a spring forcing the rod away from the light pulse and towards the fluid passage.

Abstract: Various embodiments of the teachings herein include a pulse counter for fluid pressure changes. The pulse counter may include: a first and a second housing part with a fluid passage; a circuit board at least partially enclosed within the housing, the circuit board comprising a light pulse transmitter and a light pulse receiver; a battery at least partially within the housing, the battery supplying electric power to the light pulse transmitter and the light pulse receiver; a rod slidably arranged within the housing, with one end of the rod within the fluid passage, and a second end arranged at least partly breaking a light pulse between the light pulse transmitter and the light pulse receiver; and a spring forcing the rod away from the light pulse and towards the fluid passage.