The SEOJIN INSTECH model SDT-420 Displacement Level Transmitter is one of the most advanced level instruments based on displacer device.
The buoyancy principle has been well known for many decades as its high reliability and stability. The SDT-420 operates under extremely harsh environment of 200kgf/cm2 of pressure and 450°C.
Also interface measurement betwwen two different liquids is possible. The buoyancy principle of Archimedes is applied into its operation. The SDT-420 can be configured parameter values and monitored the measured values by using PC(SIMENS PDM S/W) or HART Communicator in Control Center where located far distance from site.
It is also possible to be adjustment, operation and control easily by using conventional remote keypad on site.

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Steam/water interfaces in the various high pressure and high temperature steam drums operated in electricity-generating power plants, glass, cement, petrochemical, steel and paper making plants require close monitoring and controlling for safe, efficient and reliable operation. Since most of these steam drums normally operate at very high pressure and temperatures, any malfunction of the level measuring and controlling instruments must be prevented so that series interruptions and costly damages to the process or equipment can be precluded.
In spite of the importance of close monitoring and controlling of the drum levels, industries in the past have relied on such devices as glass and float-type level switches. But they often malfunctioned and required service or replacement interrupting the normal operation and processes. Based on many years of experience as the leading supplier of level and flow sensing instruments and in-company technological innovation, SEOJIN INSTECH has succeeded in developing this electrode-type steam drum interface monitoring system that operates reliably in the extremely high pressure and temperature environment of up to 300bar and 560°C.

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SFM series float type liquid level switch made by SEOJIN INSTECH is intended for mounting on the sidewall of a tank. This product is sturdy, switching action is definite and it is easy to be installed and maintained.

• Small Size
• Simple installation
• Wide adaptability
• Can be activated at the boundary of two liquids(SFM-16)

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SMC type Level Switch can be used to prevent an overflow of liquids in a variety of tanks by starting a draining pump or stopping a filling pump.
Safe actuation of the switch is accomplished since the switching parts are completely separated from the tank.
Setting of High and Low contact points is flexible and the cost of equipment does not depend heavily on measurement distance.
Switching point can be adjustable by moving float to up and down only.

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• Can be used for vessel under high pressure and temperature
• Designed to ASME B31.1
• Weather proof
• Explosion-proof & Frame-proof
• Unique and reliable : Snap acting switch mechanism
• Vibration resistant - eliminates fake trips by special spring
• A wide variety of chambers can be used
• Multiple switches can be assembled in a unit for economical purpose
• Weld procedures approved to KEPIC MQ and ASME IX
• Material certification to ASTM, ASME, JIS, KS Standards
• Qualified to IEEE 323-2003 and IEEE344-2004
• Applicable to hermetical seal type snap action switch

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