Mercoid Controls

Mercoid Controls came into existence when a young independent inventor with an innovative switch design needed a manufacturer for his idea. He found an interested instrumentation manufacturer, The Federal Gauge Company of Chicago, Illinois, that had extensive Bourdon tube experience dating back to 1917. Mercoid’s first control was a Bourdon tube pressure switch that was released in 1921. The switch with its ingenious design became an instant success and has lasted over eighty years through its evolution into the present D Series Pressure Control. The D Series is still the premier adjustable pressure switch on the market today.

The company was at the forefront of controls technology during the foundation of the heating and refrigeration industries, which drove expansions into temperature and level controls. Mercoid innovated mercury switches, which is where the namesake arrived. Today Mercoid is much more than mercury switches with almost all products being available with snap switches. Mercoid has continued the innovative spirit as it has expanded into many new products including level transmitters and digital pump controllers.

Level Products by Mercoid Controls

Mercoid Submersible Level Switches

	Series PBLT2 & PBLTX Submersible Level Transmitter. Perfect for Sludge and Slurries, Lightning Protected, Intrinsically Safe		Series SBLT2 & SBLTX Submersible Level Transmitter. Perfect for Ground Water and Wells, Lightning Protected or Intrinsically Safe
	Series MBLT Miniature Submersible Level Transmitter. Only 0.63" in Diameter. Perfect for Wells and Boreholes. Up to ±0.10% Accuracy, 8 V Power Options		Series FBLT Flush Tip Submersible Level Transmitter. Perfect for Sludge and Slurries, Lightning Protected, ±0.25% Accuracy

Mercoid Float Level Switches

	Series 391/393/394 Side Mounted-Chamber Type Level Control. Compact, Low Cost, Hermetically Sealed Snap Switch Option		Series 102/1102 Flanged Chamber Type Level Control. Operating Pressures to 300 PSIG
	Series 500 Insertion Type Level Control. Adjustable Deadband, Weatherproof Enclosure		Series 123/125 Boiler Water Level Control. Heavy Duty, Cast Iron Chamber
	Series 201/203/204 Side Mounted-Chamber Type Level Control. Operating Pressures to 500 psig, 34 bar, Hermetically Sealed Snap Switch Option		Series 225/227/228 Flanged Chamber. Adjustable Deadband 12" to 24", Pressure to 1000 psig (68.9 bar), Temperature to 475°F (246°C), Hermetically Sealed Switches
	Series 211/213/214 Flanged Chamber Level Control. External Mount, Pressure to 450 psig (31 bar), Temperature to 500°F (260°C)		Series 251/253/254 Welded Chamber Level Control. External Mount Pressure to 1250 psig (86 bar), Hermetically Sealed Switches, Temperature to 750°F (400°C), Explosion-Proof Housings
	Series 291/293/294 Welded Chamber Level Control. Single Stage, Low Cost, Hermetically Sealed Snap Switches		Series 401 Top Mount Float Type Level Control. Single or Two Stage for Pump or Alarm, Depth to 12', Specific Gravity to 0.50
	Series 301 Top Mount Float Type Level Control Single Stage for Alarms, Depth to 12 ft.		Series 221/223/224 Flanged Chamber Level Control. External Mount, Pressure to 1000 psig (69 bar) and Temperature to 475°F (246°C)
	Series 1211/1213/1214 Flanged Chamber Level Control. External Mount, Pressure to 450 psig (31 bar), Temperature to 500°F (260°C)		Series 1251/1253/1254 Welded Chamber Level Control. Min. Specific Gravity 0.40, Pressure to 1250 psig (86 bar), and Temperature to 500°F (260°C)
	Series 215/217/218 Flanged Chamber Level Control. Adjustable Deadband 12" to 24", Pressure to 450 psig (31 bar), Temperature to 500°F (260°C)		Series 1221/1223/1224 Flanged Chamber Level Control. External Mount, Pressure to 1000 psig (69 bar), Temperature to 475°F (246°C), Minimum Specific Gravity 0.40
	1261/1263/1264 Welded Chamber Level Control. External Mount, Pressure to 1750 psig (121 bar), and Temperature to 500°F (260°C)		Series 205 Welded Construction. External Mount Pressures to 1250 psi (86 bar) at Temperatures to 650°F (343°C), Optional Explosion-Proof Enclosures, Hermetically Sealed Switches
	Series 1241/1243/1244 Flanged Chamber. External Mount, Pressure to 1440 psig (99 bar), Hermetically Sealed Switches and Temperature to 475°F (246°C)