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DWYER 251/253/254

Photo DWYER 251/253/254 Specifications DWYER 251/253/254 Model Chart DWYER 251/253/254 User Manual for DWYER 251/253/254 Related instruments to DWYER 251/253/254

DWYER 251/253/254 welded chamber level control

DWYER 251/253/254 welded chamber level control
Series 251/253/254 Welded Chamber Level Control, time proven magnetic head leak proof construction combines with a heavy duty welded chamber to provide excellent reliability for control of compatible liquids. Operating pressures of 1250 psig (86 bar) at 650°F (345°C) and 750 psig (52 bar) at 750°F (400°C) are standard. 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. The controls feature carbon steel bodies and stainless steel internal trim. Process mounting configurations include either side/bottom combination 1″ NPT/socket weld hubs, side/bottom flanges or side/side flanges. A variety of hermetically sealed snap action or mercury switches are available in SPST, SPDT, or DPDT action for single or two stage operation. Mercury or Gold alloy snap action contacts are suitable for low current DC applications. A full range of switch enclosures are offered. Many chamber, enclosure and switch combinations are UL approved.
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Made in USA. brand DWYER, model 251/253/254

Fast delivery to Latvia, Estonia and Lithuania. International delivery to Europe, Asia, Africa and other continents available on request
Our warehouse is located in Riga, Latvia.

price by request

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Founded in 1931, DWYER manufactures equipment for measurement, conversion and control – pressure, temperature, level, flow.

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Official distributor in Latvia

Time-tested American, European and Asian brands of control and measurent instruments

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We offer a significant discount for trade organisations and manufacturing companies

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Worldwide shipping on request

We take care of all logistics and customs clearance. Fast delivery to Baltic countries

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Warranty service and repair, expert assistance in the operation of the instruments

Technical specifications of DWYER 251/253/254

  • C1-75: Minimum specific gravity 0.75. Process pressure 1250 psig (86 bar) at 100°F (38°C), to 650°F (345°C). 750 psig (52 bar) at 750°F (400°C).*
    *Heat fins and/or high temperature switches should be considered for process temperatures above 500°F (260°C).
  • Temperature Limit: Ambient Temperature: 212°F (100°C); Process Temperature: 750°F (400°C).*
    *Heat fins and/or high temperature switches must be used for process temperatures above 500°F (260°C).
  • Switch Types: Snap action or mercury.
  • Electrical Rating: See Model Chart.
  • Wiring Connections: G, WT or E enclosure, terminal block. EV enclosure 189 (460 mm) leads.
  • Process Connections: Combination 1″ NPT/socket weld hubs or flanges. See model chart.
  • Wetted Parts: C1 construction, carbon steel, 303SS, 304SS, 316SS, 430SS. (Optional 316SS with 430SS).
  • Enclosures: G painted steel and aluminum. WT, painted steel, aluminum and neoprene. E, aluminum. EV, aluminum, neoprene.
  • Weight: 251: 40 lb (18 kg); 253: 50 lb (22.7 kg); 254: 57 lb (25.8 kg).
  • Suggested Specifications: Liquid level control shall be 251 (253) (254) Series with combination 1″ NPT/socket weld hubs (flanged) process connections. Chamber shall be welded carbon steel (316SS) suitable for operation at 1250 psig (86 bar) at 100°F (38°C) to 650°F (345°C), 750 psig (52 bar) at 750°F (400°C) at a minimum specific gravity of 0.75. Circuit shall be (hermetically sealed) snap action (mercury) switch (SPST) (SPDT) (DPDT). Enclosure shall be general purpose (weather proof) (explosion-proof) (explosion-proof – vapor proof). Switch mechanism shall be gravity return and shall be activated by a stainless steel float.

Model Chart DWYER  251/253/254

EXAMPLE 251 WT 7810 C1 60 251-WT-7810-C1-60 Liquid Level Control, welded carbon steel chamber, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, operating pressure 350 psig (24 bar) at 100°F (38°C), 300 psig (21 bar) at 600°F (315400°C), side/bottom 1″ NPT, minimum specific gravity 0.60.
CONNECTION 251 One Vertical and One Horizontal 1″ NPT
253 One Vertical and One Horizontal Flanged Connection
254 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
EV Explosion-proof/Vapor-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G
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
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
CHAMBER MATERIAL C1 Carbon Steel Body
HFC1 Heat Fins, Carbon Steel Body
C216 316SS Body
HFC216 Heat Fins, 316SS Body (251 only)
C217 316SS Housing with Shield (251 only)
MINIMUM
SPECIFIC
GRAVITY		 60 0.60 Specific Gravity (251 only)
75 0.75 Specific Gravity (251 only)
160 0.60 Specific Gravity & 150# Flange (253, 254 only)
175 0.75 Specific Gravity & 150# Flange (253, 254 only)
360 0.60 Specific Gravity & 300# Flange (253, 254 only)
375 0.75 Specific Gravity & 300# Flange (253, 254 only)
660 0.60 Specific Gravity & 600# Flange (253, 254 only)
675 0.75 Specific Gravity & 600# Flange (253, 254 only)
OPTIONS STW SS Tag Wired
01 Breather Only (E-Housing only)
02 Drain Only (E-Housing only)
12 Breather & Drain (E-Housing only)
23720 Fungus Proofing
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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 -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
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User Guide and Instruction manual for DWYER 251/253/254

You can request the necessary certificates, documentation, instructions and user guide for DWYER 251/253/254 using the special form.

You can buy DWYER 251/253/254 in Latvia at a favourable price in «OLIL SIA» by leaving a request on the website, by phone +371 672 70580 or by email . DWYER 251/253/254 price are subject to change depending on exchange rates. We deliver instruments by transport companies in Latvia, Estonia and Lithuania. Worldwide shipping to Europe, Asia, Africa, North and South America available on request.

See also: Level Switches