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Model 6290 LTD. - Third generation design guarantees quality and reliability. - Probe under operator control allows monitoring of conditions at any level in the tank. - Density & temperature profiles allow detection of stratification. - Modbus interface allows integration with DCS.
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Model 6290 LTD - Third generation design guarantees quality and reliability - Probe under operator control allows monitoring of conditions at any level in the tank - Density & temperature profiles allow detection of stratification - Modbus interface allows integration with DCS - Bottom reference provides greatest accuracy
Modes of Operation - Cal (Calibrate) – Probe drives to bottom of tank to establish bottom reference, then returns to liquid level and switches to Auto - Auto – Probe tracks liquid level - Profile – Probe drives to bottom and then back up, stopping at programmed intervals to record data - Top Scan – Probe starts at current position and moves up or down, stopping at programmed intervals to record data - Manual – Probe can be driven up or down according to operator commands. Reports current temperature and density, does not track liquid level.
Hollow Helical Drive Cable w/ Conductors Bottom Reference Switch Assembly Level Sensors Sliding Lower Shroud Internal Platinum Temperature Resistance Thermometer 270 mm to bottom of of lower sensor Oscillating Spool Densitometer 2 ¼” DIA (57.15 mm) Probe Assembly Components: - Two Liquid Level Sensors - Intrinsically Safe “Bottom Reference” Switch - Oscillating-Spool Densitometer for use in various media: LNG Propane Butane Ethane - Calibrated Platinum Temperature Sensor
Drive Mechanism Housing Probe Enclosure Flameproof Control Unit Enclosure Pinch Valve Ball Valve M6290 Tank Interface: SII Supplied “Interface Assembly” is Comprised of the following: - Probe enclosure with viewing window - Pinch Valve with Buna liner - Pinch Valve to ball valve transition piece Probe may be driven into Probe enclosure and sealed off from tank using pinch valve for any required maintenance. Ball valve allows for possible removal of LTD system and assures tank integrity.
Mechanical Unit Components - Take up reel with helical drive cable - Constant tension spring motor - Flexible coupling - Gear box/speed reducer - Drive gear - Back up wheel - Arc plate - Reel feedback switch
Inside the Control Unit… All electronics to control the system are contained in the control unit, housed in a flame-proof enclosure. The control unit may not be opened in the presence of gas. • Input power is 110VAC or 230VAC. • Output of all data to control room is via 2-wire RS485. • Field wiring includes power indication and power control
Control Unit Contents: - Power Supplies - Power Conversion Card - Control Module - Zener Barriers - Motor Driver - Stepping Motor - Drive Coupling
Tank Gauge Interface Module (TGIM) - Miniature Size, 1/8 DIN Configuration - Termination point for field wiring - Termination point for wiring to DCS - Possible modem connection for remote diagnostics by SI Engineers - Access point for Hand Held PC (HHPC)
