The Seojin Instech SGL Series Gear Type Liquid Level Transmitter, configuration model code SGL-2-A-4-A-2-F, is 100% designed, engineered, and manufactured in South Korea by Seojin Instech Co., Ltd. Engineered as a robust continuous liquid level telemetry solution, the SGL series overcomes the installation bottlenecks of conventional rigid-probe level transmitters, making it exceptionally ideal for liquid storage tanks characterized by low overhead clearance and cramped headrooms.

The operating principle of the SGL-2 relies on the equilibrium between Archimedean liquid buoyancy, the float/wire suspended weight, and an internal precision recoil spring assembly. As the liquid level inside the vessel rises, increased buoyant force reduces the downward load exerted on the suspension wire, allowing the spring mechanism to wind; conversely, as the liquid level falls, buoyancy decreases, causing the float to tension the wire and unwind the spring. This vertical displacement is transferred directly via a high-precision gear train mechanism to an internal rotary potentiometer. The integrated R/I (Resistance-to-Current) electronic converter transforms this angular variation into an industry-standard 4 ~ 20mA DC analog current loop signal (15~32V DC 2-wire loop powered), providing continuous and interference-free level telemetry directly to plant PLCs, DCS, or remote indicators.

The SGL-2-A-4-A-2-F configuration provides distinct engineering advantages: an optimized 0 to 4-meter measurement range (code 4); complete wet-part construction—including the float, suspension wire, and mounting flange—fabricated from corrosion-resistant SUS304 stainless steel (code A), delivering prolonged longevity in refined fuel oils, lubricants, and industrial condensates. The slender vertical cylindrical float measuring Ø48.6 mm × 300 mm Height (code 2) is specifically engineered to fit seamlessly inside a standard 2" pipe stilling well, effectively eliminating lateral float sway and turbulent mechanical binding. Outfitted with a standardized JIS 10K 80A 6T FF flange (code A) and a fire-retardant ABS enclosure certified to IP65 weatherproof standards, the SGL-2 guarantees uncompromising operational durability and high reliability across demanding industrial environments.

• 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-4-A-2-F
• Output Configuration (Model Type): SGL-2 (Analog 4 ~ 20mA DC Output, 2-Wire Loop Powered)
• Measuring Part Length (Range): 0 ~ 4 Meters (Code 4)
• Wet Part Material (Float, Wire, Flange): Stainless Steel SUS304 / 304SS (Code A)
• Float Dimension & Style: Vertical cylindrical float Ø48.6 mm × 300 mm Height (Code 2 - suitable for 2" pipe insertion)
• Process Mounting Size: 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 Specific Gravity: Medium Specific Gravity: Min. 0.8 (Float SG: 0.6)
• Vessel Operating Pressure: Atmospheric pressure (ATM)
• Ambient Temperature Range (Main Body): -20 °C to +85 °C
• Process Temperature Range (Sensing Part): -20 °C to +85 °C
• Ingress Protection Rating: Weatherproof IP65
• Housing Material: Non-combustible industrial molded ABS resin (Unburnable ABS)
• Applicable Industries: Standby diesel generator fuel tanks (DO/FO), thermal power plants and boiler facilities (Bunker-C heavy oil), marine shipbuilding and marine fuel oil bunkering tanks, compressor lubrication oil reservoirs, water treatment cisterns and industrial cooling towers, and general chemical storage vessels.