Dwyer Sales Department: 1-201-419-6111 ext. 26 for Sales Group  |  dwyer@nciweb.com


Mercoid Series 102 / 203 / 204

Side Mounted-Chamber Type Level Control
Operating Pressures to 500 psig, 34 bar, Hermetically Sealed Snap Switch Option
 
Series 201Long life and reliable operation is inherent in the design of the 201 series. The heavy duty welded carbon steel chamber provides a control to operate up to 1000 psi (69 bar) and process temperature up to 750°F (400°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 (0.60). 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. Standard process connections are combination 1" NPT and 1" socket weld hubs. Flanged connections are offered as an option.
Specifications:
Service: Compatible liquids.
Wetted Materials: Body: carbon steel. Optional 316 SS. Float and Trim: 303 SS, 304 SS, 316 SS, and 430 SS. Options of 316 SS and 430 SS or all 316 SS.
Temperature Limits: Process: 750°F (399°C). Heat fins should be used for process temperatures above 500°F (260°C) with mercury switches, 400°F (204°C) with snap switches, and 350°F (176.7°C) with hermetically sealed snap switches.
Pressure Limit: 600 psig (41 bar) at 100°F (37.7°C), 500 psig (34 bar) at 750°F (399°C). Higher ratings available.
Enclosure Rating: NEMA 4X. Optional general purpose or explosion-proof.
Repeatability: ±1/4" (6.4 mm).
Switch Type: SPDT snap switch, hermetically sealed snap switch or mercury switch. Optional DPDT or two stage.
Electrical Rating: Snap Switch: 12A @ 120 VAC, 5A @ 240 VAC, 0.5A @ 125 VDC resistive, 0.25A @ 250 VDC resistive. Hermetically Sealed Snap Switch: 5A @ 125 VAC, 5A @ 240 VAC, 5A @ 30 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 Connections: 1" female NPT and 1" socket weld hub. Optional flange connections.
Mounting Orientation: Vertical.
Set Point Adjustment: ±1" (25.4 mm).
Weight: 201: 33 lb (14.97 kg); 203: 37 lb (17 kg); 204: 44 lb (20 kg).
Agency Approvals: UL and CSA.
Specific Gravity: 0.6 minimum.
 
Model Chart (click to open/close)
EXAMPLE 201 WT 7810 10 HF C1 60   201-WT-7810-60 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 0.60, operating pressure 600 psig (51 bar) at 100°F (38°C), 500 psi (34 bar) at 750°F (400°C).    
ENCLOSURE   G             General purpose, NEMA 1 UL CSA
  WT             Weatherproof, NEMA 3R, 4, 4X. UL  
  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). UL CSA
  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). UL CSA
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, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B.    
    98XX XX         Two stage, high capacity DC snap switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B.    
    10XX           Single stage, high temperature snap switch, continuous rating 800°F (425°C), see chart B, 201-C1-60 type rated 500 psi (34 bar), 201-C1-75 type rated at 650 psi (45 bar).    
    10XX XX         Two stage, high temperature snap switch, continuous rating 800°F (425°C), see chart B, 201-C1-60 type rated 500 psi (34 bar), 201-C-75 type rated at 650 psi (45 bar).    
WELDED CHAMBER CONSTRUCTION COMBINATION 1" NPT/SOCKET WELD HUBS                 Refer to chart C below for pressure/temperature ratings.    
          C1     Carbon steel body.    
201         C1 60   Minimum specific gravity 0.60 side/bottom process connections, combination 1" NPT/socket weld hub. UL CSA
201         C1 75   Minimum specific gravity 0.75 side/bottom process connections, combination 1" NPT/socket weld hub. UL CSA
WELDED CHAMBER CONSTRUCTION WITH FLANGED PROCESS CONNECTIONS                 Refer to chart C below for pressure/temperature ratings.    
203         C1 160   1" 150# flanges side/bottom process connection. UL CSA
203         C1 175   1" 150# flanges side/bottom process connection. UL CSA
203         C1 360   1" 300# flanges side/bottom process connection. UL CSA
203         C1 375   1" 300# flanges side/bottom process connection. UL CSA
203         C1 660   1" 600# flanges side/bottom process connection. UL CSA
203         C1 675   1" 600# flanges side/bottom process connection. UL CSA
204         C1 160   1" 150# flanges side/side process connection. UL CSA
204         C1 175   1" 150# flanges side/side process connection. UL CSA
204         C1 360   1" 300# flanges side/side process connection. UL CSA
204         C1 375   1" 300# flanges side/side process connection. UL CSA
204         C1 660   1" 600# flanges side/side process connection. UL CSA
204         C1 675   1" 600# flanges side/side process connection. UL CSA
OPTIONS         HF       High temperature fins, should be considered if ambient temperature exceeds 500°F (260°C) for extended periods.    
              12 Breather and drain for E type explosion-proof enclosure. Recommended for high humidity or outdoor service.    
ElecticalCircuits and Ratings (click to open/close)
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
CSA
SP-ST open on level RISE
10
5
3†
10
5
-4820
-4820
-20
UL
CSA
SP-DT one switch
4
2
1†
 4
2
-4810
-4810
-10
UL
CSA
SP-DT two switches E.I.*
10
5
3†
 10
5
-4815
-4815
-15
UL
CSA
DP-ST two switches E.I.* open on level FALL
10
5
3†
10
5
-4813
-4813
-13
UL
CSA
DP-ST two switches E.I.* open on level RISE
10
5
3†
 10
5
-4814
-4814
-14
UL
CSA
DP-DT two SP-DT switches
4
2
1†
 4
2
-4806
-4806
-06
UL
CSA
CHART B
snap action contacts
SP-DT one switch
12
5
3†
 0.5**
0.25**
-7810
-7810
-10
UL
CSA
DP-DT Two SP-DT switches
12
5
3†
 0.5**
0.25**
-7806
-7806
-06
UL
CSA
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
 
 
  DP-DT two SP-DT switches
2
2
 
0.4**
0.25**
-1006
-1006
-06
 
 
  SP-DT one switch
2
2
 
0.4**
0.25**
-1010
-1010
-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 (click to open/close)
SERIES
MOUNTING STYLE
MINIMUM SPECIFIC GRAVITY
PRESSURE RATING AT
FLANGE CLASS (psi)
ORDER CODE
38°C
100°F
400°F
750°C
201
1" NPT
0.6
600 psi
41 bar
500 psi
34 bar
--
C1-60
201
1" NPT
0.75
1000 psi
69 bar
750 psi
52 bar
--
C1-75
203
204
FLANGED
0.6
275 psi
19 bar
100 psi
7 bar
150
C1-160
203
204
FLANGED
0.75
275 psi
19 bar
100 psi
7 bar
150
C1-175
203
204
FLANGED
0.6
600 psi
41 bar
425 psi
29 bar
300
C1-360
203
204
FLANGED
0.75
720 psi
50 bar
425 psi
29 bar
300
C1-375
203
204
FLANGED
0.6
600 psi
41 bar
500 psi
34 bar
600
C1-660
203
204
FLANGED
0.75
100 psi
69 bar
750 psi
52 bar
600
C1-675
 
Popular Model
Model Number Description Usually Ships
201-WT-7810-C1-60 Chamber type level control, side mounted, SPDT snap switch. 1-2 Weeks
 
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