Measuring Principle
Capacitance point level detection
Measuring frequency: 500 kHz
Applicable for bulk solids with εr ≥ 2.5

Measuring Range
Span: ΔC = 5 to 1600 pF (ΔC = 5-500 pF with FEI58)
Final capacitance: CE = max. 1600 pF
Adjustable initial capacitance: CA = 5-500 pF (range 1) / 5-1600 pF (range 2, not FEI58)
Minimum capacitance change for detection: ≥5 pF

Electronic Insert Options
FEI51 (AC 2-wire): 19-253 VAC, <1.5W, <3.8mA residual
FEI52 (DC PNP 3-wire): 10-55 VDC, <20mA
FEI53 (3-wire, 3-12V signal): 14.5 VDC, <15mA
FEI54 (AC/DC relay DPDT): 19-253 VAC or 19-55 VDC, max 1.6W
FEI55 (8/16mA, SIL2/SIL3): 11-36 VDC, <600mW
FEI57S (PFM): 9.5-12.5 VDC, <150mW
FEI58 (NAMUR H-L edge): <6mW (I<1mA) / <38mW (I=2.2-4mA)

Performance
Switch point uncertainty: max. ±0.3% (per DIN 61298-2)
Non-repeatability: max. ±0.1%
Ambient temperature effect: <0.06%/10K (electronic insert)
Switching delay: 0.3-10s (adjustable, FEI51/52/54/55) / 1s or 5s (FEI58)

Environmental Conditions
Ambient temperature: -50 to +70°C / -40 to +70°C (F16 housing)
Storage temperature: -50 to +85°C
Climate class: DIN EN 60068-2-38 (Z/AD)
Degree of protection: IP66/67/68, NEMA 4X (depending on housing)
Vibration resistance: 20-2000 Hz, 0.01 g²/Hz
Shock resistance: 30g acceleration

Process Conditions
Process pressure: -1 to 25 bar
Process temperature: Up to 180°C (partially insulated PTFE) / up to 120°C (fully insulated PA)

Mechanical Construction (Rope probes FTI56)
Total length: 500 to 20,000 mm
Rope diameter: 6mm (partially insulated) / 12mm (fully insulated with 14mm)
Tensile loading capacity at 20°C: 30 kN (6mm rope) / 60 kN (12mm rope)
Weight: ~4.0 kg base (F15/F16/F17/F13) or ~4.5 kg (T13) + rope weight (0.180 kg/m for ø6mm, 0.550 kg/m for ø12mm)

Process Connections
Thread: R1½ (DIN2999), NPT1½ (ANSI)
Flanges: EN1092-1, ASME B16.5, JIS B2220 (DN50-DN100 / 2″-4″ / 10K50-10K100)

Materials
Housing: Aluminum (F17/F13/T13), Polyester (F16), Stainless steel 316L (F15)
Probe rope (partially insulated): PTFE, 1.4401 (AISI 316)
Probe rope (fully insulated): PA, galvanized steel

Certificates and Approvals
CE mark
Ex approvals: ATEX (II 1D/1-2D/1-3D EEx ia D), CSA/FM IS, CSA/FM XP, CSA/FM DIP, TIIS, NEPSI
Functional safety: SIL2/SIL3 (with FEI55)
CRN registration
AD2000 (wetted material 316L)

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