Description
Acid and Alkali RTD Sensor with Teflon Coating (Model APFS) is a high-accuracy PT100 RTD temperature sensor designed for reliable temperature measurement in compatible corrosive chemical processes involving acids, alkalis, and aggressive process fluids. Featuring a Class A PT100 sensing element, 6 mm OD × 400 mm SS316 stainless steel sheath, and a directly applied Teflon (PTFE) protective coating, this corrosion-resistant industrial temperature sensor creates a continuous protective barrier between the metallic sheath and compatible process media. With a temperature measurement range of -50°C to +250°C, the sensor is ideal for fixed installations in chemical tanks, reactors, pipelines, vessels, and process equipment where accurate temperature monitoring and enhanced resistance to chemical attack are required.
Unlike a loose PTFE protective sleeve, the bonded Teflon coating is applied directly to the sensor sheath, providing a smooth protective surface without the separate sleeve construction, making it suitable for compatible fixed-geometry process installations. For applications requiring enhanced corrosion resistance, an optional Teflon-coated titanium sheath is also available, subject to process compatibility requirements. The Model APFS features compacted MgO insulation for stable temperature measurement and a rugged IP67 die-cast aluminium terminal head for protection against dust and moisture. Manufactured by Aavad Instrument, this PTFE-coated PT100 RTD sensor is suitable for chemical, petrochemical, fertilizer, dye, specialty chemical, and corrosive process applications where material compatibility is verified against the specific chemical, concentration, temperature, pressure, and operating conditions.
Key Features
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Direct-Bonded Fused Teflon Coating Protective PTFE outer layer is chemically fused directly to the metal sheath, establishing a smooth, continuous barrier free of seams or residue-trapping gaps.
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Ultra-Resilient Titanium Sheath Option Can be optionally ordered with a specialized Teflon-coated titanium inner body to survive hyper-aggressive chemical baths and maximize sensor life.
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Fixed 400 mm Rigid Length Geometry Designed specifically as a straight 400 mm insertion probe for standard pipelines and process tanks with established, known mounting dimensions.
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High-Precision Class A Compliance High-purity platinum element matches tight international DIN-IEC accuracy tolerances ($pm0.15^circtext{C}$ at $0^circtext{C}$) to guarantee tight thermal tracking over its full operating window.
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Rugged IP67 Weatherproof Head Enclosure Upgraded die-cast aluminum connection terminal box provides complete dust-tight and waterproof sealing against driving rain and heavy ambient plant humidity.
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Compacted MgO Internal Element Shielding Dense Magnesium Oxide powder locks the simplex platinum element wiring firmly in position to eliminate component fatigue from pipeline vibrations.
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Integrated Threaded Cap and Chain Heavy-duty screw-on terminal cap features a metallic restraint chain to prevent drop loss or tool delays during routine field inspection cycles.
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Standard Single 1/2″ NPT Cable Entry Features a standard industrial electrical conduit entry point to maintain a leak-tight seal around incoming field loop wires.
Applications
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CIP-Style Corrosive Chemical Processing Direct temperature measurement inside specialized chemical clean-in-place cleaning circuits where smooth, residue-free surfaces are mandatory.
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Fixed-Geometry Industrial Acid and Alkali Tanks Reliable process tracking within stationary storage vats, chemical blending stations, and neutralizing tanks handling concentrated chemical solutions.
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Corrosive-Media Plant Piping Networks In-line temperature profiling inside chemical plant distribution piping grids subjected to aggressive acids, brines, and alkalis.
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Hyper-Aggressive Chemical Refining Utilities Specialized deployment utilizing the optional titanium-shielded probe core within heavy electrochemical processing plants, plating lines, and bleaching towers.
Datasheet
FAQs
1. What is a Teflon-Coated Acid & Alkali RTD Sensor?
A Teflon-Coated Acid & Alkali RTD Sensor is a PT100 Resistance Temperature Detector (RTD) with an SS316 stainless steel sheath coated in Teflon (PTFE) to protect the sensing element from corrosion, aggressive acids, alkalis, and harsh chemical environments. Aavad’s Model APFS is a Class A simplex PT100 RTD with an operating temperature range of -50°C to +250°C.
2. What is the maximum measurable temperature for this Teflon-Coated Sensor?
Although the sensor is specified for an operating range of -50°C to +250°C, it is generally recommended for measuring acid and alkali process temperatures up to approximately 200°C, as PTFE coatings have a lower practical continuous service temperature than the underlying SS316 stainless steel sheath.
3. Can the service life be extended beyond the standard Teflon coating?
Yes. Aavad Instrument offers an optional Teflon-coated Titanium sheath, providing enhanced corrosion resistance and a longer service life in highly aggressive acid and alkali environments compared to the standard Teflon-coated SS316 construction.
4. What is the standard construction of this Teflon-Coated RTD Sensor?
The standard sensor features a 6 mm outer diameter (OD), 400 mm long SS316 probe with compacted Magnesium Oxide (MgO) insulation, a die-cast aluminum IP67 protection head, a 1/2″ NPT cable entry, and a nickel-plated ceramic terminal block for reliable industrial temperature measurement.
5. Where is the Teflon-Coated Acid & Alkali RTD Sensor used?
Teflon-Coated Acid & Alkali RTD Sensors are widely used for acidic media temperature measurement, alkaline process monitoring, chemical processing plants, reactors, storage tanks, pipelines, electroplating, pharmaceutical manufacturing, and other corrosive industrial applications where aggressive chemicals could damage conventional stainless steel temperature sensors.
