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

Long life and reliable operation is inherent in the design of the 205 series. The heavy duty welded carbon steel chamber provides a control to operate up to 1250 psi (86 bar) and process temperature up to 650°F (343°C), 400°F (205°C) at the electrical head assembly. The use of an external magnet reduces the possibility of magnetic particle build up inside the armature tube and subsequent loss of operation as may occur with the internal magnet repulsion design. Choice of construction provides equipment suitable for specific gravity as low as (0.75). Electrical requirements are met by use of hermetically sealed snap action or mercury switches in a variety of actions including SPST, SPDT, DPDT and DPST arrangements. Optional circuits are available for low current/voltage DC; high current DC; or high temperature applications. Check the current chart for the switch best suited for your application. Standard process connections are combination 1" NPT and 1" socket weld hubs. Flanged connections are offered as an option. Contact factory for ANSI B31.1.

Product Applications

  • Refineries, chemical plants, power generating stations, water treatment plants, mixing systems, scrubbers, accumulators, condensate recovery, industrial tanks and vessels.

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

C1-75:
Minimum specific gravity 0.75. Process pressure 1250 psig (86 bar) @ 100°F (38°C), 650°F (343°C).*
Temperature Limit:
Ambient Temperature: 212° F (100°C); Process Temperature: up to 650°F (343°C).
*Heat fins (HF) and/or high temperature switches should be considered for process temperatures above 500°F (260°C).
Switch Type:
Snap action or mercury. See charts A and B.
Electrical Rating:
See charts A and B.
Wiring Connections:
G, WT or E enclosure, terminal block. EV enclosure 18" (460 mm) leads.
Process Connections:
Combination 1" NPT/socket weld hubs or flanges. See chart C.
Enclosures:
G, painted steel and aluminum; WT, painted steel, aluminum and neoprene; E, aluminum; EV, aluminum and neoprene.
Weight:
205, 40 lb (18 kg); 207, 50 lb (22.7 kg); 208, 57 lb (25.8 kg).
Agency Approval:
UL.
Suggested Specifications
Liquid level control shall be 205 (207) (208) Series with combination 1" NPT/socket weld hubs (flanged) process connections. Chamber shall be welded suitable for operation at 1250 psig (86 bar) at 100°F (38°C), 650°F (343°C) at a minimum specific gravity of 0.75. Circuits shall be (hermetically sealed) snap action (mercury) switch (SPST) (SPDT), (DPDT). Enclosure shall be general purpose (weatherproof) (explosion-proof) (explosion-proof - vapor-proof). Switch mechanism shall be gravity return and shall be activated by a stainless steel float.

Model Chart

 
EXAMPLE 205 WT 7810 10 C1 75   205-WT-7810-10-C1-75 Liquid Level Control, welded carbon steel chamber, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, side/bottom process connections, combination 1” NPT/socket weld hubs, minimum specific gravity 0.75, operating pressure 1250 psig (86 bar) at 650ºF (343ºC).
CONNECTION 205             Liquid level control
ENCLOSURE   G           General purpose, NEMA 1
  WT           Weatherproof, NEMA 3R, 4, 4X (Not CSA)
  E           Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G (CSA approved Groups C, D, E, F, G only)
  EV           Explosion-proof, vapor proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G (CSA approved Groups C, D, E, F, G only)
CIRCUITS
(for electrical circuits,
See charts A & B below)
    48XX         Single stage, mercury switch, see chart A.
    48XX XX       Two stage, mercury switch, see chart A.
    78XX         Single stage, snap switch, see chart B.
    78XX XX       Two stage, snap switch, see chart B.
    78XXHM         Hermetically sealed snap switch, see chart B.
    98XX         Single stage, high capacity DC snap switch, see chart B.
    98XX XX       Two stage, high capacity DC snap switch, see chart B.
    10XX         Single stage, high temperature snap switch, see chart B.
    10XX XX       Two stage, high temperature snap switch, see chart B.
CHAMBER
MATERIAL
              Refer to chart C below for pressure/temperature ratings
        C1     Carbon steel body
        HFC1     Heat fins carbon steel body
MINIMUM SPECIFIC
GRAVITY
          75   0.75 specific gravity
OPTIONS             R Manual reset for single stage
            R1 Manual reset for lower stage of 2-stage controls
            R2 Manual reset for upper stage of 2-stage controls
            R3 Manual reset for both stages of 2-stage controls
            STW SS 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
125V
250V
LOWER
UPPER
CHART A
Mercury Contacts
SP-ST open on level FALL
10
5
3†
 10
5
-4821
-4821
-21
UL
SP-ST open on level RISE
10
5
3†
 
10
5
-4820
-4820
-20
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
-4813
-4813
-13
UL
DP-ST two switches E.I.* open on level RISE
10
5
3†
 10
5
-4814
-4814
-14
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.
***30VDC = 5 resistive.

CHART C
SERIES
MOUNTING STYLE
MINIMUM SPECIFIC GRAVITY
PRESSURE RATING AT
FLANGE CLASS (psi)
ORDER CODE
38°C
100°F
400°F
650°C
205
1" NPT
0.75
1250 psi
86 bar
1250 psi
86 bar
--
C1-75
207
208
FLANGED
0.75
275 psi
19 bar
100 psi
7 bar
150
C1-175
207
208
FLANGED
0.75
720 psi
50 bar
425 psi
29 bar
300
C1-375
207
208
FLANGED
0.75
1250 psi
86 bar
1030 psi
71 bar
600
C1-675

Product Literature

Catalog Pages

SDS

Approvals

Questions

Question
Why is the minimum specific gravity important on the float level switches?
Answer
If a medium has a lower s.g. than the rated minimum for a float, the float will sink through the media and the switch will not operate.

Photo Downloads

You must be logged in to view this content.
Click here to login to your account.