The Seojin Instech SGL Series Gear Type Liquid Level Transmitter, configuration model code SGL-2-A-6-A-2-F, is 100% designed, engineered, and manufactured in South Korea by Seojin Instech Co., Ltd. Developed as an advanced continuous liquid level telemetry solution, the SGL series resolves the engineering bottlenecks of conventional rigid-probe level sensors, making it exceptionally well-suited for deep liquid storage tanks characterized by low overhead clearance and cramped headrooms.

The operating principle of the SGL-2 is governed by dynamic equilibrium between the Archimedean liquid buoyancy acting on the float, the gravitational weight of the suspension wire, and the tension of an internal precision coil spring assembly. As the liquid level inside the storage vessel rises, increased buoyant force relieves the downward pull of the float, enabling the spring mechanism to rewind the suspension wire; conversely, as the liquid level recedes, the float exerts downward tension, unwinding the spring. This linear movement is transmitted directly via a precision mechanical gear train to a continuous rotary potentiometer. The integrated R/I (Resistance-to-Current) electronic converter instantaneously transforms this rotational change into an industrial-standard 4 ~ 20mA DC analog current loop signal (15~32V DC 2-wire loop powered), providing seamless and noise-immune telemetry back to centralized plant PLCs or SCADA platforms.

The SGL-2-A-6-A-2-F configuration delivers outstanding specifications for heavy-duty process duties: an extended 0 to 6-meter measurement depth (code 6), specifically designed for high-capacity industrial tanks and deep sumps. All wetted components—including the float, suspension wire, and mounting flange—are fabricated from corrosion-resistant SUS304 stainless steel (code A), ensuring exceptional longevity in aggressive hydrocarbons, heavy fuel oils, and industrial condensates. The slender vertical cylindrical float measuring Ø48.6 mm × 300 mm Height (code 2) is engineered to fit smoothly inside a standard 2" pipe stilling well, completely mitigating lateral float sway and mechanical binding induced by turbulent fluid streams. Complemented by a standardized JIS 10K 80A 6T FF mounting flange (code A) and a fire-retardant ABS enclosure certified to IP65 weatherproof standards, the SGL-2 guarantees uncompromising operational durability and measurement precision.

• Manufacturer: Seojin Instech Co., Ltd.
• Origin: 100% Korea (South Korea)
• Product Series: Gear Type Liquid Level Transmitter (SGL Series)
• Configuration Model Code: SGL-2-A-6-A-2-F
• Output Configuration (Model Type): SGL-2 (Analog 4 ~ 20mA DC Output, 2-Wire Loop Powered)
• Measuring Part Length (Range): 0 ~ 6 Meters (Code 6 - Extended deep-tank measurement)
• Wet Part Material (Float, Wire, Flange): Stainless Steel SUS304 / 304SS (Code A)
• Float Style & Dimensions: Slender vertical cylindrical float Ø48.6 mm × 300 mm Height (Code 2 - suitable for 2" pipe insertion)
• Process Mounting Connection: JIS 10K 80A 6T FF Flange (Code A)
• Electrical Conduit Connection: Option F conduit connection
• Operating Power Supply: 15 ~ 32V DC (Standard 24V DC Loop Type)
• Maximum Loop Impedance: 450 Ω (at 24V DC supply)
• Measurement Accuracy: ±20 mm
• Field Calibration: Onboard potentiometer trimmers for Zero and Span calibration
• Applicable Medium Specific Gravity: Min. 0.8 g/cm³ (Float SG: 0.6)
• Vessel Operating Pressure: Atmospheric pressure (ATM)
• Ambient Operating Temperature (Main Body): -20 °C to +85 °C
• Process Operating Temperature (Sensing Part): -20 °C to +85 °C
• Ingress Protection Class: Weatherproof IP65
• Housing Material: Non-combustible industrial molded ABS resin (Unburnable ABS)
• Applicable Industries: Standby diesel generator fuel tanks (DO/FO), thermal power generation and coal-fired boiler facilities (Bunker-C heavy oil), marine shipbuilding and marine bunker tanks, deep underground water reservoirs, industrial cooling tower circuits, wastewater treatment pits, and petrochemical refineries.