Issue
Since the SPD900 is obsolete, it needs a replacement product.
Environment
Differential Air Pressure Switches
004701040 SPD900-600Pa
004701020 SPD900-200Pa
004701090 SPD910-2000Pa
004701080 SPD910-1000Pa
004701070 SPD910-500Pa
004701060 SPD910-300Pa
Cause
Obsolete part needs replacement.
Resolution
The SPD900 series was replaced by SPD910 series in 2009. Please see SPD910 data sheet for more information and details.