Contact Dwyer Sales Department: 1-201-419-6120  |  dwyer@nciweb.com


Mercoid Series 500 Insertion Type Level Control
Adjustable Deadband, Weatherproof Enclosure
Series 500Adjustable deadband combined with direct 2-1/2" threaded or 2-1/2" flange mount makes the reliable, heavy duty 500 Series ideal for liquid level control in large or small tanks. Chambers are available in cast iron, cast steel or cast 316 stainless steel to meet the most demanding application. Float rods are available from the standard 6" (152.4 mm) up to 24" (610 mm) long providing action down to a specific gravity of 0.55. 2-1/2" (64 mm) float is suitable for pressure of 400 psig (28 bar), 2-1/2" x 4" (64 x 102 mm) float is suitable for 200 psig (14 bar). Maximum operating temperature is 425°F (218°C). A variety of circuits can be ordered including SPST, SPDT or DPDT with hermetically sealed snap action or mercury contacts. Single pole, double throw electrically independent circuits are available as well as contact for high or low DC current applications. A full range of enclosures are available such as general purpose, weatherproof, explosion-proof or explosion-proof/vapor proof.
Series 500 Specifications:
Service: Compatible liquids. Cast iron is not for use with lethal or flammable substances either liquid or gaseous.
Wetted Materials: Body: Cast iron, cast steel, or 316 SS; Float and Trim: 316 SS.
Temperature Limit: 425°F (218°C).
Pressure Limit: 400 psig (27.6 bar).
Enclosure Rating: NEMA 4X. Optional general purpose or explosion-proof.
Electrical Rating: Snap Switch: 12A @ 120 VAC, 5A @ 240 VAC, 0.5A @ 125 VDC resistive, 0.25A @ 250 VDC resistive. Mercury Switch: 4A @ 120 VAC/DC, 2A @ 240 VAC/DC. Higher contact ratings available for the mercury switch.
Electrical Connections: Screw terminal.
Conduit Connection: 3/4" female NPT.
Process Connection: 2-1/2" male NPT. Optional 2-1/2" flange.
Mounting Orientation: Vertical.
Set Point Adjustment: At minimum deadband setting the set point is adjustable approximately ±1/2" (12.7 mm).
Weight: 35 lb (15.9 kg).
Agency Approvals: UL.
Deadband: Adjustable between 0.5" (12.7 mm) to 3" (76.2 mm).
Specific Gravity: 0.8 minimum. Optional 0.55 minimum.
Float and Rod Insertion Length: 6.5" (165.1 mm). Optional 12" (304.8 mm), 18" (457.2 mm), or 24" (609.6 mm) rod length. Longer float rods give larger adjustable deadband.
 
Series 500 Model Chart
EXAMPLE 500T WT 7810 10 C1 55 12 500T-WT-7810-10-C1-55-12 Liquid Level Control, NEMA 4X weatherproof enclosure, 2-1/2" NPT cast steel threaded chamber for direct tank mounting, SPDT snap action switch, fixed deadband, automatic reset, operating pressure 200 psi (14 bar) to 425°F (218°C), minimum specific gravity 0.55 with 6" (152 mm) float road and 2-1/2" x 4" (64 x 102 mm) float.
CONSTRUCTION 500T             2-1/2" NPT threaded process connection. UL
500F             Flanged direct mount process connection, 2-1/2" 125# cast iron flange furnished for (C) cast iron chamber, 2-1/2" NPT 150# carbon steel flange furnished for (C1) cast steel chamber, 2-1/2" NPT 150# 316SS flange furnished for (C216) cast 316SS chamber, other flange sizes available, consult factory. UL
ENCLOSURE   

G

           General purpose, NEMA 1. UL
  WT           Water-tight, suitable for NEMA 1, 2, 3, 4, 4X. UL
  E           Explosion-proof, Class I Groups B, C, D, Class II Groups E, F, G, Division I and II, NEMA 7, 9. UL
  EV           Explosion-proof, vapor proof, Class I Groups B, C, D, Class II Groups E, F, G, Division I and II, NEMA 7, 9. UL
CIRCUIT
(single stage)		     XXXX         Snap action or mercury switch, see chart A and B below.  
    78XXHM         Hermetically sealed snap switch, see chart B below.  
CHAMBER (single stage)          C 55   Cast iron chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" x 4" (64 x 102 mm) 316SS float and 316SS trim, pressure rating 200 psig (14 bar) to 425°F (218°C) maximum, minimum specific gravity 0.55. UL
        C 80   Cast iron chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" (64 mm) 316SS ball float and 316SS trim, pressure rating 400 psig (28 bar) to 425°F (218°C) maximum, minimum specific gravity 0.80. UL
        C1 55   Cast steel chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" x 4" (64 x 102 mm) 316SS float and 316SS trim, pressure rating 200 psig (14 bar) to 425°F (218°C) maximum, minimum specific gravity 0.55. UL
        C1 80   Cast steel chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" (64 mm) 316SS ball float and 316SS trim, pressure rating 400 psig (28 bar) to 425°F (218°C) maximum, minimum specific gravity 0.80. UL
        C216 55   Cast 316SS chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" x 4" (64 x 102 mm) 316SS float and 316SS trim, pressure rating 200 psig (14 bar) to 425°F (218°C) maximum, minimum specific gravity 0.55. UL
        C216 80   Cast 316SS chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" (64 mm) 316SS ball float and 316SS trim, pressure rating 400 psig (28 bar) to 425°F (218°C) maximum, minimum specific gravity 0.80. UL
CIRCUIT
(two stage)		     XXXX XX       Snap action or mercury switch, see chart A and B below.  
    78XXHM         Hermetically sealed snap switch, consult factory.  
CHAMBER (two stage)          C 70   Cast iron chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" x 4" (64 x 102 mm) 316SS float and 316SS trim, pressure rating 200 psig (14 bar) to 425°F (218°C) maximum, minimum specific gravity 0.70. UL
        C1 70   Cast steel chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" x 4" (64 x 102 mm) 316SS float and 316SS trim, pressure rating 200 psig (14 bar) to 425°F (218°C) maximum, minimum specific gravity 0.70. UL
        C216 70   Cast 316SS chamber, supplied with 6" (152 mm) 316SS float rod, 2-1/2" x 4" (64 x 102 mm) 316SS float and 316SS trim, pressure rating 200 psig (14 bar) to 425°F (218°C) maximum, minimum specific gravity 0.70. UL
OPTIONS               12" (305 mm), 18" (457 mm), or 24" (610 mm) float rods, must be specified on order, minimum specific gravity will increase.  
                  12  Breather and drain for E type enclosure. Recommended for high humidity or outdoor service.    
 
Previous Page