Integrated Pulse Snubbers

Danfoss MBS series transmitters with pulse snubbers are especially suited for hydraulic applications where cavitation, liquid hammer or pressure peaks may occur - influences that often cause a short but extreme excess of the maximum working pressure of the transmitter. The integrated pulse snubber is in principle designed as a nozzle mounted in the passage between the measured medium and the pressure sensitive element of the transmitter.

Application
Cavitation, liquid hammer and pressure peaks may occur in hydraulic systems with changes in flow velocity, eg. fast closing of a valve or pump starts and stops.
The problem can occur on the inlet and outlet side of a pump or valve, even at rather low operating pressures.


Media Condition
Clogging of the nozzle may occur in liquids containing particles. Mounting the transmitter in an upright position minimises the risk of clogging, because the flow into the nozzle is restricted to the start-up period when the dead volume behind the nozzle fills. The media viscosity has only little effect on the response time. Even at viscosities up to 100 cSt, the response time will not exceed 4 ms.

Types
Danfoss transmitters which have integral pulse snubbers include:- MBS 1750, 3050, 3150, 3200, 4050, 4251, 4751, and 5150