The Seojin Instech SQH Series Micro Switch Type Quick Float Level Sensor, configuration model SQH-3-A-1-D-1-A-1, is 100% designed, engineered, and manufactured in South Korea by Seojin Instech Co., Ltd. – a prestigious Asian industry leader with more than 40 years of engineering excellence in industrial level instrumentation. The SQH series is purposefully engineered to provide an economical, highly accurate, and mechanically rugged level detection solution for challenging process media loaded with suspended solids, viscous sludge, and coarse industrial wastewater.

The SQH-3-A-1-D-1-A-1 model incorporates a 3-point independent float configuration (3 Floats), facilitating simultaneous management across three essential liquid elevation thresholds within tanks and wet wells: Low Level / Dry-run protection, High Level / Pump Start command, and High-High Level emergency overflow alarming. Unlike conventional magnetic reed-switch floats that frequently bind or foul due to rags, debris, and stringy fibers, the Seojin Instech SQH float utilizes a hermetically sealed, high-durability internal micro-switch mechanism. As the rising liquid level tilts the float past its switching angle, an internal steel roller activates the micro-switch to close the Normally Open contact (Output A), transmitting instantaneous control logic directly to pump motor starters or supervisory PLC control panels.

Structurally built for demanding chemical and corrosive exposure, this configuration features a heavy-duty top-mounting assembly combining a JIS 100A FF flange fabricated from High-Density Polyethylene (HDPE) with a PF 2" threaded connection made of robust ABS resin. This construction ensures absolute chemical immunity against aggressive industrial effluents containing diluted acids, alkaline chemicals, and sewer gases like hydrogen sulfide (H2S). The 0~5 meter flexible multi-wire suspension cable (Type 1) is insulated with specialized wear-resistant polymers to withstand continuous immersion and grease contact. An integrated solid PVC stabilizing weight (Ø60 mm × 110 mm Height) anchors the cable assembly, ensuring steady vertical orientation and eliminating false triggering caused by turbulence or surging in deep sump pits.

In standard production, this unit is shipped in a disassembled configuration for optimized freight safety; however, upon project request, AnhNghiSon provides pre-assembly services prior to delivery for seamless, out-of-the-box site installation.

• Manufacturer: Seojin Instech Co., Ltd.
• Origin: 100% Korea (South Korea)
• Product Series: Micro Switch Type Quick Float Level Sensor (SQH Series)
• Configuration Model Code: SQH-3-A-1-D-1-A-1
• Number of Floats: 3 independent floats (3-Point Level Sensing: Low, High, High-High)
• Contact Output Configuration: Normally Open (Output A / NO Contact)
• Wiring Type: Multi-Wire configuration (Type 1, individual signaling for each float)
• Process Mounting Connection: PF 2" ABS Thread with JIS 100A FF Flange molded from HDPE (chemical and corrosion resistant)
• Measuring Cable Length: 0 to 5 meters (Heavy-duty, oil and water-resistant multi-core cable)
• Stabilizing Weight Material & Dimensions: Solid PVC (Ø60 mm × 110 mm Height)
• Conduit Connection Size: Standard PF 1/2" Thread
• Switching Element: High-sensitivity, sealed mechanical Micro Switch
• Electrical Contact Rating: 250V AC - 5A / 30V DC - 5A
• Operating Fluid Temperature Range: 0 °C to +60 °C (32 °F to 140 °F)
• Operating Pressure Rating: Atmospheric pressure
• Minimum Fluid Specific Gravity: 0.85 g/cm³ and above
• Ingress Protection Rating: IP68 for submersible float heads
• Factory Dispatch Status: Standard unassembled state (Pre-assembly available upon request)
• Applicable Industries: Municipal and industrial wastewater treatment plants, stormwater and flood drainage pumping stations, textile dyeing and electroplating effluent pits, biological equalization and sedimentation basins, water treatment chemical dosing tanks, industrial cooling tower basins, food processing grease trap sumps, and commercial high-rise building basement drainage networks.