Series 190 Single Stage Top Mount Displacer Type Level Control

Fixed or Adjustable Deadband, For Pumps or Alarms

One of our most versatile level controls, the Series 190 can be used on all types of tank or sump level control applications.

Mercoid® Displacer Controls use displacers that do not float on the surface of liquids, but are suspended on a coil spring. They work on the principle that submerged solids weigh less in liquids, and as the liquid level rises and their weight decreases, the tension on the spring by which they are suspended is decreased. Because they work on a different principle than float type liquid level controls, displacers are not affected by turbulence or pressure, and are excellent for applications with viscous or dirty liquids.

Product Applications

  • Oil refineries, chemical plants, power generating stations, pumping stations, sanitary/waste water facilities, sumps and open or closed tanks and vessels.

Models & Ordering

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Model Number Description Usually Ships Price Order
B190-WT-7810-1.0 Liquid level switch/control, SPDT snap switch. Same Day $973.00 Order

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Specifications

Service:
Compatible liquids.
Wetted Materials:
Cable, spring and stops: 316 SS. Optional Inconel® spring; Displacers: Porcelain. Optional 304 SS, 316 SS, or carbon graphite.
Temperature Limits:
32 to 200°F (0 to 93.3°C). Higher ratings available.
Pressure Limit:
125 psig (8.6 bar). Higher ratings available.
Enclosure Rating:
NEMA 4X. Optional general purpose or explosion-proof.
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@ 120 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:
4" 125 cast iron flange. Other material, size, and rating flanges are available.
Mounting Orientation:
Vertical.
Set Point Adjustment:
Adjustable by moving displacers, see dimension chart for minimum and maximum values.
Weight:
General purpose or watertight enclosure with 4" 125# cast iron flange approximately 28 lb (12.7 kg); Explosion-proof or explosion-proof/vapor-proof approximately 32 lb (14.5 kg).
Agency Approvals:
UL, none on HM switch.
Specific Gravity:
Standard is 1.0. Specify when ordering by replacing 1.0 in model number with specific gravity setting desired. Settable range is 0.5 to 1.2.
Cable Length:
10 ft (3 m) standard. Optional up to 100 ft (30.5 m).
Inconel® is a registered trademark of Huntington Alloys Corporation.

Model Chart

 
EXAMPLE A 190 G 4810 P A 0.4 1 INC Series A190-G-4810-P-A-0.4-1-INC Level Control, SPDT, porcelain displacers, 10 ft. cable, 0.4 specific gravity, 3" 125# cast iron flange, with Inconel spring.
TYPE A
AA
B
BB
                4" Flange or Larger, Fixed Differential
3" Flange, Fixed Differential
4" Flange or Larger, Adjustable Differential
3" Flange, Adjustable Differential
SERIES   190               Single Stage Top Mount Displacer Type Liquid Level Control
ENCLOSURE     G
WT
E
EV
            General Purpose
Watertight
Explosion-proof
Explosion-proof/Vapor-proof
CIRCUITS       48XX
78XX
78XXHM
98XX
          See Chart A below
See Chart B below
See Chart B below
See Chart B below
DISPLACERS         P
S
S304
K
I
        Porcelain
316SS
304SS
Karbate (A190, B190 only)
Intrf 3-1/2 dia. x 10 (A190, B190 only)
CABLE LENGTH           A
B
C
D
E
F
G
      10 ft.
15 ft.
20 ft.
25 ft.
30 ft.
40 ft.
50 ft.
SPECIFIC GRAVITY             0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
    0.4 S.G. (A190, AA190 only)
0.5 S.G. (A190, AA190 only)
0.6 S.G.
0.7 S.G.
0.8 S.G.
0.9 S.G.
1.0 S.G.
1.1 S.G.
1.2 S.G.
FLANGE               00
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
6S
7S
8S
9S
10S
11S
12S
13S
14S
15S
  3" NPT connection
3/4" Screw connection
3" 125# cast iron (AA190, BB190 only)
4" 125# cast iron
5" 125# cast iron
6" 125# cast iron
8" 125# cast iron
3" 150# RF carbon steel
4" 150# RF carbon steel
5" 150# RF carbon steel
6" 150# RF carbon steel
8" 150# RF carbon steel
3" 300# RF carbon steel
4" 300# RF carbon steel
5" 300# RF carbon steel
6" 300# RF carbon steel
8" 300# RF carbon steel
3" 250# RF cast iron
4" 250# RF cast iron
5" 250# RF cast iron
6" 250# RF cast iron
8" 250# RF cast iron
3" 150# RF 316SS
4" 150# RF 316SS  
5" 150# RF 316SS  
6" 150# RF 316SS  
8" 150# RF 316SS  
3" 300# RF 316SS
4" 300# RF 316SS  
5" 300# RF 316SS  
6" 300# RF 316SS  
8" 300# RF 316SS  
OPTIONS                 INC
R
STW
01
02
12
23720
Inconel Spring
Manual Reset
SS Tag Wired
Breather Only (E-Housing only)
Drain Only (E-Housing only)
Breather and Drain (E-Housing only)
Fungus Proofing

CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS
SWITCH TYPE
SWITCH ACTION
ELECTRICAL RATINGS IN AMPS
ORDERING CODE
AC
DC
120V
240V
440V
30V
125V
250V
CHART A
Mercury
Contacts
SPST Open on Level Fall
10
5
3†
 
10
5
4821
SPST Open on Level Rise
10
5
3†
 
10
5
4820
SPDT One switch
4
2
1†
 
4
5
4810
SPDT Two switches E.I.*
10
5
3†
 
10
5
4815
DPST Two switches E.I.* Open on Level Fall
10
5
3†
 
10
5
4813
DPST Two switches E.I.* Open on Level Rise
10
5
3†
 
10
5
4814
DPDT Two SPDT switches
4
2
1†
 
4
2
4806
CHART B
Snap Action
Contacts
SPDT One switch
12
5
3†
 
0.5†
0.25†
7810
DPDT Two SPDT switches
12
5
3†
 
0.5†
0.25†
7806
SPDT One hermetically sealed switch
5
5
 
5†
 
 
7810HM
DPDT Two hermetically sealed SPDT switches
5
5
 
5†
 
 
7806HM
DPDT Two SPDT switches
10
3
 
 
10‡
3‡
9806
SPDT One switch
10
3
 
 
10‡
3‡
9810

*Electrically Independent; †Resistive; ‡10 amp inductive (polarized) at 125 VDC.

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