Series 500 Insertion Type Level Control

Adjustable Deadband, Weatherproof Enclosure

Adjustable 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.

Product Applications

  • Oil refineries
  • Chemical plants
  • Power generating stations
  • Pumping stations
  • Heat transfer systems
  • Sanitary/waste water facilities
  • Drip legs
  • Hydraulic systems
  • Boilers

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

Minimum Specific Gravity:
Dependent on float size and rod length. See model chart.
Temperature Limits:
Ambient Temperature: 212°F (100°C); Process Temperature: 425°F (218°C).
Switch Type:
Snap action or mercury. See circuit charts A and B on catalog page.
Electrical Rating:
See charts A and B on catalog page.
Wiring Connection:
G, WT or E enclosure, terminal board. EV enclosure 18" (460 mm) leads.
Process Connections:
T type 2-1/2" NPT. F type 2-1/2" flange standard.
Enclosures:
G, painted steel and aluminum. WT, painted steel, aluminum and neoprene. E, aluminum. EV, aluminum and neoprene.
Wetted Parts:
See model chart on catalog page.
Weight:
500 T, 10 lb (4.5 kg); 500 F, 14 lb (6.4 kg).

Model Chart

EXAMPLE 500T WT 7810   C 55 6 0   500T-WT-7810-C-55-6-0 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 200psi (14 bar) to 425°F (218°C), minimum specific gravity 0.55 with 6” (152mm) float rod and 2-1/2” x 4” (64mm x 102mm) float.
CONSTRUCTION 500T                 NPT threaded process connection
500F                 Flanged direct mount process connection
ENCLOSURE   G               General purpose, NEMA 1
  WT               Watertight NEMA 4, 4X
  E               Explosion-proof, NEMA 7, 9
  EV               Explosion-proof, vapor-proof, NEMA 7, 9
CIRCUITS
(for electrical circuits,
See charts A & B below)
    XXXX XX           Snap action or mercury switch, see chart A and B below.
    78XXHM             Hermetically sealed snap switch, see chart B below or consult factory.
CHAMBER MATERIAL         C         Cast iron
        C216         Cast 316SS
        C217         Cast 316SS with shielded armature
MINIMUM SPECIFIC
GRAVITY
          80       0.80 specific gravity, 2-1/2” diameter round float
          70       0.70 specific gravity, 2-1/2” x 4” float (2 stage only)
          55       0.55 specific gravity, 2-1/2” x 4” float
ROD LENGTH             6     6” 316SS (Standard)
            12     12” 316SS
            18     18” 316SS
            24     24” 316SS
FLANGE               0   No flange
              2   2-1/2” 125# cast iron
              3   3” 125# cast iron
              4   4” 125# cast iron
              5   6” 125# cast iron
              6   2-1/2” 150# forged steel
              7   3” 150# forged steel
              8   4” 150# forged steel
              9   6” 150# forged steel
              10   2-1/2” 300# forged steel
              11   3” 300# forged steel
              6S   2-1/2” 150# 316SS
              7S   3” 150# 316SS
              8S   4” 150# 316SS
OPTIONS                 HF Heat fins
                R Manual reset for single stage
                R1 Manual reset for lower stage of 2-stage controls
                STW Stainless steel tag wired
                01 Breather only (E-Housing only)
                02 Drain only (E-Housing only)
                12 Breather and drain (E-Housing only)
                23720 Fungus proofing special 23720

CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS
SWITCH TYPE
SWITCH ACTION
ELECTRICAL RATINGS IN AMPS
ORDERING CODE
 
 
 
AC
DC
SINGLE STAGE
TWO STAGE
120V
240V
440V
30V
125V
250V
LOWER
UPPER
CHART A
Mercury Contacts
SP-ST open on level FALL
10
5
3†
 
10
5
-4820
-4820
-20
UL
SP-ST open on level RISE
10
5
3†
 
10
5
-4821
-4821
-21
UL
SP-DT one switch
4
2
1†
 
4
2
-4810
-4810
-10
UL
SP-DT two switches E.I.*
10
5
3†
 
10
5
-4815
-4815
-15
UL
DP-ST two switches E.I.* open on level FALL
10
5
3†
 
10
5
-4814
-4814
-14
UL
DP-ST two switches E.I.* open on level RISE
10
5
3†
 
10
5
-4813
-4813
-4813
UL
DP-DT two SP-DT switches
4
2
1†
 
4
2
-4806
-4806
-06
UL
CHART B
snap action contacts
SP-DT one switch
12
5
3†
 
0.5**
0.25**
-7810
-7810
-10
UL
DP-DT Two SP-DT switches
12
5
3†
 
0.5**
0.25**
-7806
-7806
-06
UL
SP-DT one hermetically sealed switch
5
5
 
5**
 
 
-7810HM
-7810HM
-10HM
 
DP-DT two hermetically sealed SP-DT switches
5
5
 
5**
 
 
-7806HM
-7806HM
-06HM
 
DP-DT two SP-DT switches
10
3
 
 
10‡
3‡
-9806
-9806
-06
 
SP-DT one switch
10
3
 
 
10‡
3‡
-9810
-9810
-10
 

†Available on special order, change 1st digit in ordering code from 4 to 5 or 7 to 8, i.e., -4820 becomes -5820, -7810 becomes -8810, etc.
‡10 amp inductive (polarized) at 125 VDC.
*Electrically Independent.
**Resistive.

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