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


Mercoid Series 221, 223 and 224

Flanged Chamber Level Control
External Mount, Pressure to 1000 psig (69 bar) and Temperature to 475°F (246°C)

Merocoid Level ControlsHeavy duty flanged chamber features removable float for ease of inspection and maintenance. The 221 Series also provides 1" NPT for standard external mounting. Socket weld hubs or flanges are optional. Rugged C1-75 construction is suitable for operation at 1000 psi (69 bar) at 100°F (38°C), and 850 psig (59 bar) at 475°F (246°C) with a minimum specific gravity of 0.75. C1-60 construction is suitable for operation at 600 psig (41 bar) at 100°F (38°C), and 550 psig (38 bar) at 475°F (246°C) with a minimum specific gravity of 0.60. Models featured can be ordered with various circuits including SPST, SPDT, or DPDT with hermetically sealed snap action or mercury contacts. A full range of enclosures are available including general purpose, weatherproof, explosion-proof, or explosion-proof – vapor proof.

Mercoid Series 221 Mercoid Series 221 (1227 KB)

Specifications:
C1-60: Minimum specific gravity 0.60; Process pressure 600 psig (41 bar) at 100°F (38°C), 550 psig (38 bar) at 475°F (246°C).
C1-75: Minimum specific gravity 0.75; Process pressure 1000 psig (69 bar) at 100°F (38°C), 850 psig (59 bar) at 475°F (246°C).
Switch Type: Snap action or mercury switch.
Electrical Rating: See Model Chart.
Wiring Connections: G, WT or E enclosure, terminal block. EV enclosure, 18" (460 mm) leads.
Process Connections: 1" NPT standard (socket weld hubs or flanges optional). See Model Chart.
Enclosures: G, painted steel and aluminum. WT, painted steel, aluminum and neoprene. E, aluminum. EV, aluminum and neoprene.
Wetted Parts: Chamber, carbon steel. Trim 316SS, 303SS, 304SS and 430SS.
Weight: 221: 60 lb (27 kg); 223: 70 lb (32 kg); 224: 77 lb (35 kg).
 
Model Chart (click to open/close)
EXAMPLE 221 WT 7810 C1 60   221-WT-7810-C1-60 Liquid Level Control, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, operating pressure 600 psig (41 bar) at 100°F (38°C), 550 psig (38 bar) at 475°F (246°C), side/bottom process connections, 1" NPT, minimum specific gravity 0.60.
CONNECTION 221           One Vertical and One Horizontal 1" NPT
223           One Vertical and One Horizontal Flanged Connection
224           Two Vertical Flanged Connections
ENCLOSURE    G         General Purpose, NEMA 1
  WT         Weatherproof, NEMA 3R, 4, 4X
  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, 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 Temp. Snap Switch, continuous rating 800°F (425°C), see chart B
    10XX-XX       Two Stage, High Temp. Snap Switch, continuous rating 800°F (425°C), see chart B
CHAMBER MATERIAL       C1     Carbon Steel Body
      C216     316SS Body
      HFC1     Heat Fins & Carbon Steel Body
SPECIFIC
GRAVITY
        60   0.60 Specific Gravity
        75   0.75 Specific Gravity
        160   0.60 Specific Gravity & 150# Flange
        175   0.75 Specific Gravity & 150# Flange
        360   0.60 Specific Gravity & 300# Flange
        375   0.75 Specific Gravity & 300# Flange
        660   0.60 Specific Gravity & 600# Flange
        675   0.75 Specific Gravity & 600# Flange
OPTIONS           H2 H2 Socket Weld Hub
          R Manual Reset, Single Stage
          R1 Manual Reset, Lower Stage 2-Stage Control
          R2 Manual Reset, Upper Stage 2-Stage Control
          R3 Manual Reset, Both Stages 2-Stage Control
          STW SS Tag Wired
          01 Breather Only
          02 Drain Only
          12 Breather & Drain
          23720 Fungus Proofing
 
Charts A & B - Electrical Circuits 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
30V
125V
250V
LOWER
UPPER
CHART A
Mercury Contacts
SP-ST open on level FALL
10
5
3†
 
10
5
-4821
-4821
-21
SP-ST open on level RISE
10
5
3†
 
10
5
-4820
-4820
-20
SP-DT one switch
4
2
1†
 
4
2
-4810
-4810
-10
SP-DT two switches E.I.*
10
5
3†
 
10
5
-4815
-4815
-15
DP-ST two switches E.I.* open on level FALL
10
5
3†
 
10
5
-4813
-4813
-13
DP-ST two switches E.I.* open on level RISE
10
5
3†
 
10
5
-4814
-4814
-14
DP-DT two SP-DT switches
4
2
1†
 
4
2
-4806
-4806
-06
CHART B
snap action contacts
SP-DT one switch
12
5
3†
 
0.5**
0.25**
-7810
-7810
-10
DP-DT two SP-DT switches
12
5
3†
 
0.5**
0.25**
-7806
-7806
-06
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
 
 
Previous Page