Measuring System (PN40/Class 300, BI & TWIN)
Measuring principle: Magnetic level indicator with communicating-tubes bypass chamber(s); float magnetically coupled to mechanical indicator; redundant transmitter measurement
Measuring range (ML): 0.3…5.5 m / 1…18 ft (longer on request)

Measuring Accuracy
Accuracy: ±10 mm / 0.4 in
Repeatability: ±10 mm / 0.4 in (constant density)
Maximum rate of change: 20 mm/s / 0.787 in/s
With OPTIFLEX/OPTIWAVE level transmitter: ±2 mm / ±0.08 in

Operating Conditions (PN40/Class 300)
Process temperature (BI): -70…+250°C / -94…+482°F
Process temperature (TWIN): -196…+400°C / -320.8…+752°F
Ambient temperature: -70…+80°C / -94…+176°F
Storage temperature: -70…+80°C / -94…+176°F
Process pressure: -1…40 barg / -14.5…580 psig

Operating Conditions (PN400/Class 2500, TWIN only)
Process pressure: -1…400 barg / -14.5…5801 psig
Process temperature: -196…+400°C / -320.8…+752°F

Chemical Properties
Density (BI): 620…1200 kg/m³ / 38.71…74.91 lb/ft³
Density (TWIN, PN40): 370…1200 kg/m³ / 23.10…74.91 lb/ft³
Min. density difference for interface: ≥200 kg/m³ / ≥12.49 lb/ft³
Viscosity: ≤500 mPa·s / ≤500 cP

Ingress Protection
Indicator column: IP66 / IP68 (0.15 barg)

Materials
Measuring chamber: Stainless steel 1.4404/316L or 1.4307/304L; Hastelloy® C-276 (2.4819); Inconel® 625 (2.4856)
Float: Stainless steel 316L/304L, titanium, Hastelloy® C-276, Inconel® 625
Indicator column rail: Stainless steel 1.4401/316
Indicator column tube: Borosilicate glass 3.3 (ISO 3585), hermetically sealed
Process connection: Stainless steel 316L/304L, Hastelloy® C-276, Inconel® 625
Gasket: Aramid (≤250°C), graphite, 316L/graphite spiral-wound, PTFE, or ring joint (higher pressure classes)

Process Connections (PN40/Class 300)
Flange EN: DN15…50, PN40
Flange ASME: NPS 1/2…2, Class 150/300
Flange JIS: 25…50, 20K

LT40 Reed-Chain Level Transmitter
Measuring principle: Reed resistor chain, magnetically operated
Resolution: Standard ±10 mm / 0.4 in (Option: ±5 mm / 0.2 in)
Output: 4-20 mA (HART® 7), FOUNDATION™ fieldbus, or PROFIBUS PA
Multidrop: Up to 63 transmitters (HART network)
Power supply (4-20mA, no LCD): 10-35 VDC (non-Ex/Ex db) / 10-30 VDC (Ex ia)
Ambient temperature: -40…+80°C / -40…+176°F
Storage temperature: -40…+80°C / -40…+176°F
Ingress protection: IP66/IP68 (1.5m depth, 2 weeks)
Housing material: Polyester-coated aluminium
Reed-chain tube/clamp material: Stainless steel 1.4401/316

MS15/MS40 Limit Switches
Measuring principle: Bistable reed switch (SPDT)
Switching capacity: 250 V AC/DC, 1 A, 60 VA/W (standard) / NAMUR: Umax=13V DC
Operating temperature: -40…+115°C (MS15) / -40…+120°C (MS40)
Ingress protection: MS15: IP66/IP68; MS40: IP66
Housing: Aluminium (epoxy powder paint) or stainless steel 316L (MS15 only)

Approvals and Certifications
CE/UKCA marking
Explosion protection: ATEX/IECEx/UKEX — Ex h IIC T6…T1 Ga/Gb or Ex h IIC T6…T1 Gb (indicator); Ex ia/Ex db IIC T6…T1 (LT40, MS15/40)
Pressure: EU PED, UK PE(S)R, ASME B31.3
Vibration resistance: EN 60721-3-4, class 4M4
Construction code: EN 13445 (standard); NACE MR0175/MR0103/ISO 15156, ASME B31.3 (option)