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Series-201-203-204
Carbon Steel Chamber, 1000 psi & 750 °F, for Refineries & Plants
- Reliable liquid level control for chemical plants, refineries, and industrial facilities.
- Gravity return SS switching mechanism extends life without spring wear.
- Heavy-duty welded steel float chamber rated 500 psi at 750°F.
- Weatherproof NEMA 4X enclosure with optional explosion-proof rating.
Series-201-203-204
From
C$
11,073.61
Product Overview
- Conduit Connection 3/4 in NPT Female
- Electrical Connection Screw Terminal
- Enclosure Ratings IP66, NEMA Type 4
- Mounting Orientation Vertical
- Pressure Note 600 psig (41 bar) at 100°F (37.7°C), 500 psig (34 bar) at 750°F (399°C). Higher ratings available
- Measurement Pressure Type Gauge
- Process Connection Note 1˝ female NPT and 1˝ socket weld hub. Optional flange connections
- Process Connection Size 1 in
- Process Connection Type NPT Female
- Process Temperature, Max 350 °F
- Process Temperature Note 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
- Proof Pressure Up to 600 psi
- Series ID Series-201-203-204
- Set Point Adjustment ± 1 in
- Specific Gravity 0.6
- Switch Type Note SPDT hermetically sealed snap switch
- Weight 33 lb
Supported Applications
The Dwyer Series 201, 203, and 204 are magnetic type liquid level controls designed for reliable operation in chemical plants, refineries, and industrial facilities. These side-mounted chamber-type devices utilize mutual magnetic attraction between a plunger on the float and a magnet on the switch assembly to actuate control circuits based on fluid levels.
Operating Conditions & Performance
The series is engineered for high-temperature service, with process temperature ratings up to 750°F (399°C). For operation above specific thresholds—above 500°F (260°C) with snap switches, 400°F (204°C) with mercury switches, and 350°F (176.7°C) with hermetically sealed snap switches—the use of heat fins is required.
Pressure ratings vary by model type and temperature. The Series 201 offers a rating of 600 psig at 100°F, reducing to 500 psig at 750°F. Higher pressure capabilities are available across the series envelope; for example, Type 204 configurations support up to 1000 psi at lower temperatures and 750 psi at 750°F Max., depending on flange class.
Performance repeatability is specified as ±1/4" (6.4 mm). The controls are compatible with liquids having a minimum specific gravity ranging from 0.58 to 0.75, depending on the series and configuration.
Configuration Options
The Series 201-203-204 family supports multiple configurations for housing materials, process connections, switch types, and circuit arrangements:
- Housing & Materials: The standard enclosure is a heavy-duty welded steel chamber. Wetted parts include carbon steel bodies with optional 316 SS construction. Floats and trim are available in 303 SS, 304 SS, 316 SS, and 430 SS.
- Process Connections: Standard connections include 1" female NPT and 1" socket weld hub. Optional flange connections (RF forged steel) are available in Class 150, 300, and 600 ratings for Series 203 and 204.
- Enclosure Ratings: Standard enclosures meet NEMA 4X (IP66). Optional general purpose or explosion-proof housings are offered.
- Switch Types & Outputs: Available switch mechanisms include SPDT snap switches, hermetically sealed snap switches, and mercury switches. Circuit arrangements support Single Pole Double Throw (SP-DT), Double Pole Single Throw (DP-ST), and two-stage operations with DP-DT configurations.
- Electrical Connection: A 3/4" female NPT conduit connection is provided for electrical wiring via screw terminals.
Key Product Differences
Differences within the series are defined by pressure ratings, specific gravity requirements, and flange specifications. Series 201 utilizes a side-mounted chamber with pipe or socket weld connections, while Series 203 and 204 incorporate RF forged steel flanged connections rated for higher pressures (up to Class 600). The series also encompasses related types such as the sealed housing stainless steel float models (Series 251-254) and high-pressure variants (Type 1271, 1273, 1274), which support specific gravity down to 0.58 and pressure ratings up to 2325 psi at 660°F.
Model numbering follows the format Type ----, such as 201-WT-7810-C1-60, where "WT" denotes weather resistant and "4810", "7810", or similar codes indicate the specific switch circuit arrangement.
