X0202 4/A 2007-12-05 2007-12-06 0 0000100625 SIERRA MONITOR CORP /CA/ SRMC 0001399024 Hague Edward Knut 1991 TAROB COURT MILPITAS CA 95035 0 1 0 0 VP OF ENGINEERING COMMON STOCK 2007-12-05 2007-12-06 4 S 0 2000 1.65 D 215045 D (1) The Reporting Person is amending the Form 4 originally filed on December 6, 2007 for the purpose of correcting the amount of securities beneficially owned following the reported transaction. The error was also reflected in subsequent Forms 4 filed between December 11, 2007 and March 19, 2008. /s/ Edward Knut Hague 2008-04-18