SF340 FLT CREW REPORTS WEATHER DIVERSION AFTER TWO ATTEMPTS TO LAND AT DESTINATION AND DIVERSION TO SECOND ALTERNATE AFTER LOC FAILURE AT FIRST ALTERNATE. LOW FUEL EMERGENCY IS DECLARED.

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WHILE ENRTE TO ZZZ; THE LCL ASOS WAS RPTING 200 FT OVCST AND 1 SM VISIBILITY. WE WERE VECTORED AND CLRED BY CTR FOR THE ILS XX. UPON REACHING DECISION ALT; THE CAPT ADVISED 'NO CONTACT; GAR' AND WE EXECUTED THE PUBLISHED MISSED APCH PROC. AFTER CONTACTING CTR AND ENTERING THE HOLD; THE CAPT CONTACTED DISPATCH; AND THEY DETERMINED THAT WE HAD ENOUGH FUEL TO ATTEMPT THE ILS XX AT ZZZ ONE MORE TIME AND THEN DIVERT TO THE FILED ALTERNATE OF ZZZ1. WE THEN ADVISED CTR THAT WE WOULD LIKE TO TRY THE APCH AGAIN; AT WHICH POINT WE WERE CLRED AGAIN FOR THE ILS AT ZZZ. AFTER REACHING DECISION ALT ON THE SECOND ATTEMPT; THE CAPT AGAIN ADVISED ME TO GO AROUND; AND WE EXECUTED THE PUBLISHED MISSED APCH AND HOLD. THE CAPT THEN CONTACTED DISPATCH AGAIN; AT WHICH POINT WE WERE ADVISED TO DIVERT TO ZZZ2. IT WAS MY UNDERSTANDING THAT THE REASON WE COULD NOT DIVERT TO ZZZ1 AS PLANNED; WAS BECAUSE NO STATION PERSONNEL WERE AVAILABLE TO MEET THE FLT. WHEN WE PICKED UP THE ASOS AT ZZZ2 WHILE ENRTE; THE CEILING WAS RPTED AS 400 FT OVCST. THE ONLY APCH AVAILABILITY WITH MINIMUMS BELOW 400 FT WAS THE ILS XX. AFTER BEING VECTORED AND CLRED FOR THE ILS XY AT ZZZ2 BY CTR; I NOTIFIED THE CAPT THAT WE WERE NOT YET PICKING UP THE LOC. WE BOTH CONFIRMED THAT WE HAD THE PROPER FREQ SET IN NAV #1 AND NAV #2. THE CAPT THEN NOTIFIED CTR OF THE PROB. THE CTLR THEN CHKED NOTAMS AND DID NOT FIND ANY NOTAM ABOUT THE ILS RWY XY BEING OTS. HE THEN TOLD US THAT HE MADE A NOTAM ABOUT THE ILS BEING OTS. THE CAPT THEN CONTACTED DISPATCH ONCE AGAIN; AS OUR FUEL WAS STARTING TO GET LOW; AND THE DISPATCHER NOTIFIED THE CAPT THAT WE SHOULD DIVERT TO ZZZ3 WHERE THE SKIES WERE RPTED TO BE CLR. CTR CLRED US DIRECT TO ZZZ3. WHILE ENRTE; WE PULLED THE PWR BACK TO MAINTAIN THE LONG RANGE CRUISE SPD INDICATED ON THE EADI; AND STARTED A SLOW CLB; BOTH TO CONSERVE FUEL. THE CAPT NOTIFIED CTR THAT WE WERE GOING TO BE LNDG WITH LESS THAN HALF AN HR OF FUEL ON BOARD; AND THE CTLR SAID THAT HE WOULD NOTIFY ATC SO THEY 'WON'T PUT YOU BEHIND SOMEBODY ELSE.' WHILE STILL ENRTE; THE 'R LOW LEVEL' LIGHT ILLUMINATED ON THE OVERHEAD PANEL. THE CAPT RAN THE QRH PROC FOR THE LIGHT. A FEW MINS LATER; THE 'L LOW LEVEL' LIGHT CAME ON; AS WELL. AFTER BEING HANDED OFF TO ZZZ3 APCH; THE CTLR ASKED US IF WE WERE AN EMER; AS ATC AT ZZZ3 WAS CLOSING IN ABOUT 3 MINS (BUT WOULD STAY OPEN IF WE WERE AN EMER). THE CAPT THEN INFORMED THE CTLR THAT WE WERE INDEED DECLARING AN EMER; AND THE CTLR CLRED US STRAIGHT IN. THE CTLR ALSO ADVISED US THAT HE WAS GOING TO ROLL THE TRUCKS AS STANDARD PROC. ONCE WE HAD THE RWY IN SIGHT; WE WERE CLRED TO LAND; AND THE FLT ENDED WITHOUT FURTHER INCIDENT. AFTER SHUTTING DOWN THE ACFT; WE HAD APPROX 350-400 LBS TOTAL OF FUEL REMAINING IN THE FUEL TANKS. AFTER ABOUT AN HR ON THE GND AT ZZZ3; WE DEPARTED BACK TO ZZZ4 UNEVENTFULLY. THE LOW FUEL CONDITION AND SUBSEQUENT EMER LNDG WERE A DIRECT RESULT OF THE ILS AT ZZZ2 BEING UNKNOWINGLY OTS. UNTIL WE WERE VECTORED ONTO THE APCH; NOBODY (FLT CREW; DISPATCHER; ATC) KNEW THAT THE ILS WAS NOT OPERATING PROPERLY. HAD THE ILS BEEN OPERATING CORRECTLY WITH THE RPTED WX AT THE FIELD; THE FLT COULD HAVE LANDED AT ZZZ2 AS A NORMAL DIVERTED FLT.