The DDSM1 is no longer available for sale. The draft simulator and pressure switch testing and calibration features found in the DDSM1 can now be found in our new SDMN6 Dual Port Manometer and Pressure Switch Tester.
Pressure switches are often out of calibration before they completely fail, and it is for a wide variety of reasons -- all of which can cause the furnace to operate in an unsafe manner.
The DDSM1 Draft Simulator creates a controlled vacuum to test pressure switches, so technicians can tell exactly when a pressure switch closes and opens. This either proves that the switch is within specification, or identifies if the switch is starting to fail.
Plus, the DDSM1 is the only tool able to calibrate adjustable pressure switches to manufacturers’ specifications. This saves contractors from carrying a large inventory of pressure switches on their trucks, and from leaving the job site to buy pre-calibrated switches.
How to test a pressure switch with the Fieldpeice DDSM1 Draft Simulator