Yokogawa FU20-VP-T1-NPTFPS | FU20 All-in-One pH/ORP Sensor, VarioPin, 3/4" NPT, Pt1000
Yokogawa FU20-VP-T1-NPTFPS combination pH & ORP sensor with integral Pt1000, PPS (Ryton) body, 3/4" NPT tapered thread, VarioPin (VP) connector. Gel-filled double-junction reference, dome-shaped glass.
Product Overview
The Yokogawa FU20-VP-T1-NPTFPS is an all-in-one wide-body pH/ORP combination sensor from the FU20 series, designed for inline or immersion installation in wastewater and industrial process applications. It integrates four measuring elements — pH glass electrode, Ag/AgCl double-junction reference, solid platinum ORP electrode, and Pt1000 RTD — in a single rugged PPS 40GF (Ryton) body with 3/4" NPT tapered thread for direct mounting. The -VP suffix indicates a VarioPin detachable connector (no fixed cable), and -FPS denotes the included F*40 adapter option. This sensor enables simultaneous pH (0–14) and ORP (±1500 mV) measurement with temperature compensation, suitable for Yokogawa FLXA21, PH400 series, and SENCOM transmitters.
Technical Specifications (Measuring Elements & Electrical)
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Parameter
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Specification
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Order Number
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FU20-VP-T1-NPTFPS
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Series
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Yokogawa FU20 All-in-One pH/ORP Sensor
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Measured Parameters
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pH (0…14), ORP (±1500 mV), Temperature
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pH Electrode
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Dome-shaped pH glass (G-glass)
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Reference System
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Ag/AgCl with saturated KCl gel, Double liquid junction, Porous PTFE diaphragm
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ORP / Solution Ground
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Solid Platinum electrode
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Temperature Element
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Pt1000 (IEC 751) — built-in for compensation
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pH Slope (at 25°C)
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> 96 % of theoretical value
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Asymmetry Potential
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8 ± 15 mV
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Glass Impedance (Dome)
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Typ. 200–350 MΩ @ 25°C
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Connection Type
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VarioPin (VP) — detachable multi-pin connector (requires mating cable WU10 series)
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Technical Specifications (Mechanical & Process Conditions)
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Parameter
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Specification
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Body Material
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PPS 40GF (Ryton® / Polyphenylene Sulfide), glass-filled
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Process Connection
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3/4" NPT Male Tapered Thread (integral)
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Sensor Diameter / Length
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Ø26 mm / Total length approx. 99 mm (insertion ~65 mm)
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Sealing / O-ring
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Viton® (FKM)
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Operating Temp. Range
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-10 … +105 °C
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Max. Process Pressure
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1.0 MPa (10 bar / 145 psig) @ ≤ 105 °C
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Minimum Conductivity
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> 50 µS/cm
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Cable / Connector Option
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None supplied — VarioPin (VP) connector only; order separate VP cable (e.g. WU10-V-S-xx)
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Included Accessory
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F*40 Adapter (PPO) — denoted by /FPS suffix
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Calibration Certificate
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Supplied with each sensor
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Key Features
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Four-in-One Design: Single sensor body measures pH + ORP + Temperature + Reference — eliminates need for separate probes.
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Double-Junction Gel Reference: Large-volume polymerized KCl with PTFE porous junction resists poisoning in dirty/wastewater — extends service life vs. single-junction designs.
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VarioPin Detachable Connector (-VP): Allows sensor replacement without rewiring the transmitter; pin-coded to prevent misconnection.
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Direct NPT Mount: 3/4" NPT thread screws straight into a tee, pipe, or immersion fitting — no special holder required.
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Pt1000 Built-In: Provides accurate temperature compensation for pH and direct temp readout to the analyzer.
Typical Applications
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Municipal / Industrial Wastewater: pH & redox monitoring in aeration basins, neutralization tanks, and effluent lines.
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Chemical Process Lines: Where simultaneous pH and ORP (e.g., chlorine control, cyanide destruction) are required.
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Food & Beverage / Pharmaceutical: CIP rinse verification (pH swing) and sanitization cycle ORP monitoring (with appropriate chemical compatibility check).
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Cooling Tower / Boiler Blowdown: pH control loops with ORP trend monitoring.
Suffix decode: FU20 = Wide-body combo sensor | -VP = VarioPin detachable connector (no cable) | -T1 = Pt1000 RTD | -NPT = 3/4" NPT male thread, PPS body, dome glass | -FPS = F40 adapter (PPO) included. For integrated fixed cable version, select FU20-xx-T1-NPT (e.g. FU20-05-T1-NPT for 5 m cable).*
