LVC500-Series

Supported Applications

The Omega LVC500 Series comprises low-cost conductivity level switch systems designed for liquids only. These electronic level controls operate on a simple conductance principle to maintain liquid levels in industrial sumps or indicate high-level alarms in holding tanks. The series is suitable for conductive media including potable water, condensate, acids, and water-based chemicals (inorganic chemicals). It is not intended for non-aqueous liquids such as oils or hydrocarbons.

Operating Conditions & Performance

The LVC500 Series operates within an ambient temperature range of -40 to 65°C (-40 to 150°F). The system features a response time with a ½ second delay on rising level and hysteresis of 1.6 mm (±1/16"). Performance varies by electronics module regarding maximum media resistance: standard relay modules LVC511, LVC521 support up to 50,000 Ω; the field-adjustable LVC512 supports 4700 to 1 million Ω. Intrinsically safe modules offer different ranges: LVC551 is field adjustable from 0 to 470,000 Ω, while LVC552 supports up to 100,000 Ω.

Pressure ratings depend on the assembly type and material. The LVC-S3 threaded single electrode holder (¾ MNPT) is rated for 400 psig at 231°C (448°F). Threaded assemblies are generally rated to 250 psig at 208°C (406°F), while 125# cast iron flanges support 125 psig at 178°C (353°F) and 150# 316 SS flanges support 225 psig.

Configuration Options

The system consists of three configurable components: cut-to-length threaded electrode rods, single or multi-electrode holders (threaded or flanged), and remote electronic modules. The series supports a broad envelope of configurations:

• Electrodes: Available in 303 SS (LVC-E1x) and 316 SS (LVC-E5x). Standard lengths include 305 mm (12"), 610 mm (24"), 915 mm (36"), 1220 mm (48"), 1525 mm (60"), and up to 1830 mm (72"). Beyond 1.8 m (72"), probes require PTFE sleeving at the tip.
• Holders & Assemblies: Threaded multi-electrode assemblies are available in Stainless Steel, Brass, or Cast Iron for 1 to 7 electrodes with junction boxes included. Flanged multi-electrode assemblies (Stainless Steel or Cast Iron) support nominal pipe sizes from 1" to 3".
• Electronics Modules: Options include standard relay electronics (LVC511, LVC512, LVC521) and intrinsically safe modules. The LVC551 is FM approved for Class I and II, Division 1, Groups A through G; the LVC552 is UL approved.
• Outputs & Logic: Modules provide SPDT relay outputs with field-selectable latching/non-latching operation and high/low alarm or pump-up/pump-down logic. Power supply options include standard 102 to 132 Vac (or 110 to 132 Vac for LVC552), 50/60 Hz, with optional 240 Vac and 24 Vac models.
• Materials: Wetted materials include 303 SS, 316 SS, PTFE, Brass, and Cast Iron. Housing options feature Clear Lexan® (see-through), die-cast aluminum, or epoxy-coated finishes.

Key Product Differences

The series distinguishes between standard relay electronics and intrinsically safe variants based on the application environment. Standard modules LVC511 and LVC521 utilize 8-pin and open circuit board connections respectively, while the LVC512 uses an 11-pin socket to support field-adjustable sensitivity from 4700 Ω up to 1 million Ω.

Intrinsically safe modules (LVC551, LVC552) are required when electrodes or float switches are located in hazardous areas. These controls must be mounted in a non-hazardous location with wiring separated from non-intrinsically safe circuits per the National Electrical Code (NEC). The LVC-S3 holder is specifically noted for its higher pressure rating of 400 psig at maximum temperature compared to standard threaded assemblies.