SEOJIN INSTECH Co., Ltd.

Level switches, level transmitters and flowmeters for process and power plants

LISTEDMANUFACTURER

Seongnam, Gyeonggi-do, South Korea

About

SEOJIN INSTECH manufactures level and flow instruments: float, displacer and magnetic level switches, point-level switches for bulk solids, level transmitters and gauges, electromagnetic and ultrasonic flowmeters, and differential-pressure flow elements such as orifice plates and pitot tubes.

The company has worked in measurement for over 30 years and states that it was among the first in Korea to hold both ISO 9001 and KEPIC (Korea Electric Power Industry Code) certification. Its instruments support HART smart communication.

Markets named by the company include chemicals, food and feed, ceramics and mining, paper, textiles, steel, water and wastewater, construction, and hydro, thermal and nuclear power generation.

Products

Float, Magnetic and Displacer Level Switches

Mechanical level switches for liquids: stem float switches, cable-suspended quick floats, side-mounted magnetic float switches and chamber-type displacer switches for high-temperature, high-pressure vessels.

Key features

Stem, cable-suspended, side-mounted and chamber designs
Chamber switches rated to 400°C and 70 bar
Magnetic float switches with stroke 150–400 mm
SPDT/DPDT contacts up to 10 A 250 V AC
Explosion-proof options on displacer types

Applications

Sewage and water purification plants
Chemical and fuel oil tanks
Boiler and high-pressure vessels
Beverage tanks

57 mm–5 m range; up to 400°C; up to 100 kgf/cm²

24 models

Model	Series	Type	Range	Temperature	Max. pressure	Output / contact
SOL-5	SOL	Stem float switch	57–1000 mm	-10 to 100°C	ATM–10 kgf/cm²	0.5 A (50 W) reed contact
SOL-2B	SOL	Stem float switch	57–1000 mm	-10 to 100°C	ATM–10 kgf/cm²	0.5 A (50 W) reed contact
SOL-2P	SOL	Stem float switch	57–1000 mm	-10 to 100°C	ATM–10 kgf/cm²	0.5 A (50 W) reed contact
SOLH-3	SOL	Stem float switch	57–1000 mm	-10 to 100°C	ATM–10 kgf/cm²	0.5 A (50 W) reed contact
SOL-V	SOL	Stem float switch	57–1000 mm	-10 to 100°C	ATM–10 kgf/cm²	0.5 A (50 W) reed contact
ST-POINT	ST-POINT	Multi-point stem float switch (1–4 points, 5 optional)	Up to 5 m	SUS: -10 to 100°C; PVC: -10 to 60°C	SUS: 10 kg/cm²; PVC/PTFE: 2 kg/cm²	0.5 A 300 V AC/DC
SQM-4A1B1B1	SQM	Cable-suspended quick float	5 m (20 m option)	-10 to 70°C	2 kg/cm²	0.4 A 100 V AC
SQM-5A1B1B1	SQM	Cable-suspended quick float	5 m (20 m option)	-10 to 70°C	2 kg/cm²	0.4 A 100 V AC
SQH-4A1C1A1	SQH	Cable-suspended quick float	5 m (20 m option)	-10 to 70°C	2 kg/cm²	3 A 250 V AC
SQH-5A1C1A1	SQH	Cable-suspended quick float	5 m (20 m option)	-10 to 70°C	2 kg/cm²	3 A 250 V AC
SQC	SQC	Cable-suspended quick float	5 m (20 m option)	-10 to 70°C	2 kg/cm²	1 A 120 V AC
SQE	SQE	Cable-suspended quick float, high temperature	5 m (20 m option)	-10 to 150°C	10 kg/cm²	1 A 120 V AC
SMC	SMC	Displacement type level switch	Up to 5 m	-40 to 120°C (230°C option)	10 kg/cm² (30 kg/cm² option)	1 SPDT (1–4 DPDT option), 5 A 250 V AC
SMC-73	SMC-7	Vertical chamber float switch		-40 to 400°C	46 bar	1 SPDT (1 DPDT option)
SMC-75	SMC-7	Vertical chamber float switch		-40 to 400°C	70 bar	1 SPDT (1 DPDT option)
SHM-100	SHM-100	Horizontal magnetic float switch	200–400 mm stroke	Detector -25 to 210°C	10 kgf/cm²	1 DPDT, 250 V AC 10 A
SHM-100E	SHM-100	Horizontal magnetic float switch	200–400 mm stroke	Detector -25 to 210°C	10 kgf/cm²	1 DPDT, 250 V AC 10 A
SHM-100T	SHM-100	Horizontal magnetic float switch	200–400 mm stroke	Detector -25 to 210°C	10 kgf/cm²	1 DPDT, 250 V AC 10 A
SHM-2000	SHM-2000	Vertical magnetic float switch	200–400 mm stroke	Detector -25 to 350°C	10 kgf/cm² (100 kgf/cm² option)	1 SPDT (1 DPDT option), 5 A 250 V AC
SFM-11	SFM	Mini side-mounted magnetic float switch	150–300 mm stroke	10 to 120°C	5 kgf/cm²	SPST or SPDT, 0.5 A / 50 W
SFM-12	SFM	Mini side-mounted magnetic float switch	150–300 mm stroke	10 to 120°C	5 kgf/cm²	SPST or SPDT, 0.5 A / 50 W
SFM-13	SFM	Mini side-mounted magnetic float switch	150–300 mm stroke	10 to 120°C	5 kgf/cm²	SPST or SPDT, 0.5 A / 50 W
SFM-14	SFM	Mini side-mounted magnetic float switch	150–300 mm stroke	10 to 120°C	5 kgf/cm²	SPST or SPDT, 0.5 A / 50 W
SFM-16	SFM	Mini side-mounted magnetic float switch	150–300 mm stroke	10 to 80°C	5 kgf/cm²	SPST or SPDT, 0.5 A / 50 W

Point Level Switches for Solids and Liquids

Point-level detection for powders, granules and liquids, covering rotary paddle, piston, vibrating rod and fork, RF admittance, capacitance, tilt and electrode principles, plus a drum level indicator for boilers and a paddle flow switch.

Key features

Rotary paddle and piston switches for bulk solids
Vibrating fork for solids (SVF-500) and liquids (SVF-600)
Capacitance and RF switches to 230°C / 500°C option
Remote drum level system to 300 bar and 560°C
Relay outputs up to 10 A 250 V AC

Applications

Silos and hoppers (cement, feed, grain)
Chemical and process tanks
Boiler drums in power plants
Pump protection on liquid lines

Paddle, piston, vibrating, RF, capacitance, tilt, electrode and flow switches; up to 560°C

55 models

Model	Series	Type	Range	Temperature	Max. pressure	Output / contact
SRF-600	SRF	RF admittance	371/381 mm probe (1000 mm option)	-20 to 80°C (500°C option)	ATM	10/20 mA DC; 16–30 V DC supply
SRF-900	SRF	RF admittance	371/381 mm probe (1000 mm option)	-20 to 80°C (500°C option)	ATM	1 DPDT 5 A 250 V AC; 110/220 V AC
SPS+	SPS+	Rotary paddle	100/271 mm (extension 200–2300 mm)	-10 to 80°C (150°C option)	ATM	1 SPDT 5 A 250 V AC; 220 V AC
SR7	SR7	Rotary paddle	69/128 mm (extension 200–2300 mm)	-10 to 80°C (150°C option)	ATM	1 SPDT 5 A 250 V AC; 110/220 V AC
SC5-X	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-TA	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-F	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-D	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-G	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-E	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-L	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-EF	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-S	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-EG	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SC5-T	SC5	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SB3-X	SB3	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SB3-F	SB3	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SB3-G	SB3	Piston type	93 mm (500 mm option)	-10 to 80°C (150°C option)	ATM	1 SPDT 10 A 250 V AC
SVL-15	SVL	Vibration rod	270 mm (rod 4000 / flexible 5000 mm option)	-20 to 80°C	10 kg/cm²	1 DPDT 5 A 250 V AC
SVL-25	SVL	Vibration rod	270 mm (rod 4000 / flexible 5000 mm option)	-20 to 80°C	10 kg/cm²	1 DPDT 5 A 250 V AC
SVL-35	SVL	Vibration rod	270 mm (rod 4000 / flexible 5000 mm option)	-20 to 80°C	10 kg/cm²	1 DPDT 5 A 250 V AC
SVF-500	SVF	Vibrating fork, solids		-20 to 80°C (-30 to 200°C option)	15 bar	1 DPDT 5 A 250 V AC; 85–264 V AC
SVF-500S	SVF	Vibrating fork, solids		-20 to 80°C (-30 to 200°C option)	15 bar	1 DPDT 5 A 250 V AC; 85–264 V AC
SVF-500SS	SVF	Vibrating fork, solids		-20 to 80°C (-30 to 200°C option)	15 bar	1 DPDT 5 A 250 V AC; 85–264 V AC
SVF-600	SVF	Vibrating fork, liquids		-20 to 80°C (-30 to 200°C option)	15 bar	1 DPDT 5 A 250 V AC; 85–264 V AC
SCAP-1A1A	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-1A2A	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-1A1B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-1A2B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-2A1B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-2A2B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-3A1B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-3A2B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-4A1B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-4A2B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-5A1B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-6A1B	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-1	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-2	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-3	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-4	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-5	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
SCAP-6	SCAP	Capacitance	250–4000 mm	-20 to 230°C	ATM–10 kgf/cm²	DPDT 5 A 250 V AC; 110/220 V AC
STT	STT	Tilt switch	5 m cable (10 m option)	-10 to 150°C	ATM	1 SPST 1 A 120 V AC
SEC	SEC	Electrode holder	2 m (5 m option)	-10 to 80°C	ATM	1–6 points
SH-1	SH	Electrode holder	2 m (5 m option)	-10 to 80°C	ATM	1–6 points
SH-3	SH	Electrode holder	2 m (5 m option)	-10 to 80°C	ATM	1–6 points
SH-4	SH	Electrode holder	2 m (5 m option)	-10 to 80°C	ATM	1–6 points
SH-5	SH	Electrode holder	2 m (5 m option)	-10 to 80°C	ATM	1–6 points
SH-6**E	SH	Electrode holder	2 m (5 m option)	-10 to 80°C	ATM	1–6 points
SH-7	SH	Electrode holder	2 m (5 m option)	-10 to 80°C	ATM	1–6 points
SDG-3000	SDG/SDS	Remote drum level indicator (8/12/16 electrodes)	8, 12 or 16 electrodes	Up to 560°C	300 bar	4–20 mA + 5 SPDT, LED/digital display
SDS-3000	SDG/SDS	Remote drum level switch (8/12/16 electrodes)	8, 12 or 16 electrodes	Up to 560°C	300 bar	3 DPDT
SF-3	SF	Liquid flow switch (paddle)	PT 3/4"–1" (pipe up to 6" option)	-10 to 80°C (100°C option)	10 kg/cm²	1 SPDT 10 A 250 V AC
SF-4	SF	Liquid flow switch (paddle)	PT 3/4"–1" (pipe up to 6" option)	-10 to 80°C (100°C option)	10 kg/cm²	1 SPDT 10 A 250 V AC

Level Transmitters and Level Gauges

Continuous level measurement by float chain, torque-tube displacer, capacitance, hydrostatic pressure, tape and gear-type mechanisms, together with tubular, reflex, transparent and magnetic level gauges.

Key features

4–20 mA output across all transmitter types
Displacer transmitter to 450°C and 100 kg/cm²
Hydrostatic transmitters for 0–30 m
Magnetic level gauges with optional 4–20 mA
Glass gauges to 200 kg/cm²

Applications

Storage tanks and sumps
Boilers and pressure vessels
Water and wastewater
Oil and chemical plants

4–20 mA; 140 mm–30 m; up to 450°C; up to 200 kg/cm²

25 models

Model	Series	Type	Range	Temperature	Max. pressure	Output / contact
ST-600	ST-600	Float (reed chain) transmitter	Up to 5.9 m	-20 to 60°C (150°C option)	SUS: 10 kg/cm²; PVC/PTFE: 2 kg/cm²	4–20 mA; 15–32 V DC
ST-610	ST-600	Float (reed chain) transmitter	Up to 5.9 m	-20 to 60°C (150°C option)	SUS: 10 kg/cm²; PVC/PTFE: 2 kg/cm²	4–20 mA; 15–32 V DC
SDT-420	SDT-420	Torque-tube displacer transmitter	350–2000 mm	Up to 450°C	100 kg/cm²	4–20 mA; 15–30 V DC
SCAP-IV	SCAP-IV	Capacitance transmitter (analog)	Rod 1 m (4 m) / wire 5 m (30 m)	-20 to 60°C	ATM	4–20 mA; 24 V DC
SPT	SPT/SPL	Hydrostatic pressure transmitter	0–30 m	-20 to 80°C	ATM	4–20 mA; 24 V DC
SPL	SPT/SPL	Hydrostatic pressure transmitter	0–30 m	-20 to 80°C	ATM	4–20 mA; 24 V DC
SLT-2200	SLT	Tank level gauge (tape/float)	3–20 m (seal port 15 m option)	-10 to 120°C (200°C option)	ATM (5 kg/cm² option)	4–20 mA; SLT-4400 up to 8 SPDT
SLT-3300	SLT	Tank level gauge (tape/float)	3–20 m (seal port 15 m option)	-10 to 120°C (200°C option)	ATM (5 kg/cm² option)	4–20 mA; SLT-4400 up to 8 SPDT
SLT-4400	SLT	Tank level gauge (tape/float)	3–20 m (seal port 15 m option)	-10 to 120°C (200°C option)	ATM (5 kg/cm² option)	4–20 mA; SLT-4400 up to 8 SPDT
SGL-1	SGL	Gear-type float transmitter	Up to 10 m	-10 to 80°C	ATM	4–20 mA; 24 V DC
SGL-2	SGL	Gear-type float transmitter	Up to 10 m	-10 to 80°C	ATM	4–20 mA; 24 V DC
SGL-3	SGL	Gear-type float transmitter	Up to 10 m	-10 to 80°C	ATM	4–20 mA; 24 V DC
SHBG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHRG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHTG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHRZG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHTZG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHRLG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHTLG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHRJG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHTJG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHCG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHMG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHSG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC
SHWPG Series	LG	Level gauge (tubular / reflex / transparent / magnetic)	Tubular 300–5000 mm; reflex/transparent 140–2850 mm; magnetic 300–4000 mm	Up to 350°C	Up to 200 kg/cm²	Magnetic type: 4–20 mA, 24 V DC

Electromagnetic, Ultrasonic and Variable-Area Flowmeters

Flow measurement instruments including clamp-on ultrasonic meters, electromagnetic flowmeters with PTFE or hard-rubber liners, wedge meters and metal-tube variable-area meters, plus flow sight glasses.

Key features

Clamp-on ultrasonic for DN 15–6000
Electromagnetic meters 15A–1000A, turndown to 1500:1
HART and RS485 communication
Metal-tube meters to 300°C / 30 kg/cm²
Socket and flange connections

Applications

Water and wastewater networks
Chemical dosing
Steam and hot liquid lines
Process plants

DN 15–6000; up to 300°C; 4–20 mA / RS485 / HART

11 models

Model	Series	Type	Range	Temperature	Max. pressure	Output / contact
SUF	SUF	Ultrasonic clamp-on	DN 15–6000 (S/M/L sensors), 0–±10 m/s	-30 to 90°C (160°C option)		4–20 mA, pulse, RS485 Modbus, relay; 90–240 V AC
SMF	SMF	Electromagnetic	15A–1000A, turndown up to 1500:1	PTFE liner -10 to 160°C; hard rubber -10 to 80°C		4–20 mA, RS485, HART; 85–230 V AC
ACEMAG-SMF	SMF	Electromagnetic	15A–1000A, turndown up to 1500:1	PTFE liner -10 to 160°C; hard rubber -10 to 80°C		4–20 mA, RS485, HART; 85–230 V AC
SMF-H	SMF	Electromagnetic	15A–1000A, turndown up to 1500:1	PTFE liner -10 to 160°C; hard rubber -10 to 80°C		4–20 mA, RS485, HART; 85–230 V AC
SMF-R	SMF	Electromagnetic	15A–1000A, turndown up to 1500:1	PTFE liner -10 to 160°C; hard rubber -10 to 80°C		4–20 mA, RS485, HART; 85–230 V AC
SMF-S	SMF	Electromagnetic	15A–1000A, turndown up to 1500:1	PTFE liner -10 to 160°C; hard rubber -10 to 80°C		4–20 mA, RS485, HART; 85–230 V AC
SWF	SWF	Wedge flowmeter	25A–600A
SMC-1000	SMC	Metal-tube variable-area flowmeter	Socket 1/4"–2"; flange 1/2"–8"	Up to 300°C	30 kg/cm²
SMC-2000	SMC	Metal-tube variable-area flowmeter	Socket 1/4"–2"; flange 1/2"–8"	Up to 300°C	30 kg/cm²
SMC-3000	SMC	Metal-tube variable-area flowmeter	Socket 1/4"–2"; flange 1/2"–8"	Up to 300°C	30 kg/cm²
SEOJIN SIGHT GLASS	Sight glass	Flow sight glass	Socket 1/4"–2"; flange 1/2"–8"	Up to 300°C	30 kg/cm²

Differential-Pressure Flow Elements

Primary flow elements for differential-pressure measurement: orifice plates and assemblies, venturi tubes, flow nozzles, cone meters, multi-point averaging elements and averaging pitot tubes.

Key features

Orifice assemblies to 450°C and 65 kg/cm²
Averaging pitot tubes for 2"–72" lines
Cone flowmeters with 15:1 range
Flow nozzles for steam service
Multiple venturi tube styles

Applications

Power plant steam and feedwater
Process gas and liquid lines
HVAC and district energy
Large water mains

Pipe sizes 1"–72"; up to 450°C; up to 100 kg/cm²

18 models

Model	Series	Type	Range	Temperature	Max. pressure
SVT	SVT	Venturi tube
SVT-A	SVT	Venturi tube
SVT-B	SVT	Venturi tube
SVT-C	SVT	Venturi tube
SVT-F	SVT	Venturi tube
SFN	SFN	Flow nozzle		Up to 190°C	17 kg/cm²
SOP-10	SOP	Orifice plate assembly	1–24", 5:1 (FS)	Up to 450°C	65 kg/cm²
SOP-20	SOP	Orifice plate assembly	1–24", 5:1 (FS)	Up to 450°C	65 kg/cm²
SOP-30	SOP	Orifice plate assembly	1–24", 5:1 (FS)	Up to 450°C	65 kg/cm²
SOP-40	SOP	Orifice plate
SOP-41	SOP	Orifice plate
SOP-42	SOP	Orifice plate
SOP-43	SOP	Orifice plate
SOP-50	SOP	Orifice plate	25A–400A
SCF-A	SCF	Cone (V-cone type) flowmeter	2–36", 15:1	Up to 370°C	42 kg/cm²
SCF-B	SCF	Cone (V-cone type) flowmeter	2–36", 15:1	Up to 370°C	42 kg/cm²
MPA	MPA	Multi-point averaging flowmeter	3–24", 12:1 (RD)	Up to 450°C	100 kg/cm² (40°C)
SAP-810	SAP-810	Averaging pitot tube	2–72", 10:1 (FS)	Up to 450°C	100 kg/cm² (40°C)

Level Controllers and Alarm Units

Panel controllers that convert float, quick-float, electrode and 4–20 mA signals into pump control and alarm outputs, plus multi-channel alarm units.

Key features

Dedicated controllers for float, quick-float and electrode sensors
4–20 mA level controller with set points
4-channel alarm units (SPST or SPDT)
110/220 V AC supply
-10 to 60°C operating range

Applications

Pump start/stop
High/low level alarms
Tank level panels

110/220 V AC; relay outputs; 4–20 mA input

24 models

Model	Series	Type	Outputs	Power supply	Ambient
SLCA-H	SLCA	2-wire float switch controller	1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLCA-HL	SLCA	2-wire float switch controller	1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLCA-H-4W	SLCA	2-wire float switch controller	1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLCA-HL-5W	SLCA	2-wire float switch controller	1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SQ-2U	SQ-U	Quick-float controller	1 SPDT	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SQ-3U	SQ-U	Quick-float controller	SQ-4U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SQ-3U-4W	SQ-U	Quick-float controller	SQ-4U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SQ-4U	SQ-U	Quick-float controller	SQ-4U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SQ-4U-2W	SQ-U	Quick-float controller	SQ-4U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SQ-4U-5W	SQ-U	Quick-float controller	SQ-4U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SQ-2ST-6W	SQ-U	Quick-float controller	SQ-4U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SEC-3U	SEC-U	2-wire electrode controller	1 SPDT	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SEC-4U-4W	SEC-U	2-wire electrode controller	SEC-5U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SEC-5U	SEC-U	2-wire electrode controller	SEC-5U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SEC-5U-2W	SEC-U	2-wire electrode controller	SEC-5U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SEC-5U-5W	SEC-U	2-wire electrode controller	SEC-5U: 1 SPDT + 2 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLA-4P	SLA	Alarm controller	4 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLA-4P-E	SLA	Alarm controller	4 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLA-4P-Q	SLA	Alarm controller	4 SPST	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SMA-4P	SMA	Alarm controller	4 SPDT	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLIC-4P	SLIC	4–20 mA level controller	3 SPST + 1 SPDT, 4–20 mA loop	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLIC-4PD	SLIC	4–20 mA level controller	3 SPST + 1 SPDT, 4–20 mA loop	110/220 V AC ±10%, 50/60 Hz	-10 to 60°C
SLI-100U	SLI	Level indicator/controller		24 V DC	-10 to 60°C
Multi Wire Level Controller	Multi-wire	Multi-wire level controller

Company facts

Country: South Korea
Founded: 1987
Business registration: Not provided
Certifications: ISO 9001, KEPIC

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SEOJIN INSTECH Co., Ltd.

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Products

Float, Magnetic and Displacer Level Switches

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Point Level Switches for Solids and Liquids

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Level Transmitters and Level Gauges

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Electromagnetic, Ultrasonic and Variable-Area Flowmeters

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Differential-Pressure Flow Elements

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Level Controllers and Alarm Units

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SEOJIN INSTECH Co., Ltd.

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