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RTD-Immersion-No-Well
RTD Immersion No Wells
- Designed for liquid temperature monitoring: Immersion sensors are built for commercial HVAC and building management systems, including chilled water, hot water, boilers, pumps, compressors, chillers, and cooling towers.
- Durable stainless steel construction: 304 stainless steel probes and thermowells provide dependable performance in demanding piping and mechanical-room applications.
- High-accuracy Platinum RTD options: Available in 100 Ω and 1 kΩ Platinum RTD models with Class A accuracy and DIN EN 60751 compatibility.
- Fast, stable response: Double-encapsulated sensing elements help protect against moisture while improving thermal response using thermally conductive epoxy.
- Flexible installation choices: Choose welded thermowell, machined thermowell, or no-thermowell configurations for new installations or existing thermowell applications.
- Multiple enclosure options: Available with galvanized, plenum-rated plastic, aluminum NEMA 3R, or NEMA 4X/IP66 enclosures to match the installation environment.
- Easy controller integration: 2-wire and 3-wire configurations support building management systems, PLCs, and temperature transmitters, with 3-wire models helping compensate for lead-wire resistance.
- Built for broad temperature use: Platinum RTD immersion models operate from -40°C to 200°C (-40°F to 392°F), making them suitable for a wide range of hydronic and process temperature applications.
- Backed by ACI reliability: CE, UKCA, RoHS2, and WEEE approvals plus ACI’s five-year limited warranty support confidence in long-term field performance.
RTD-Immersion-No-Well
From
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70.00
Product Overview
- Accuracy ± 0.06 % Class A
- Applications Air and HVAC, Boilers, Clean Water and Purified Solutions, Environmental Monitoring, Flow Measurement
- Enclosure Ratings UL94-5VB
- Housing Material ABS plastic
- Operating Humidity 10 to 95% RH, non-condensing
- Operating Temperature, Max 200 °C
- Operating Temperature, Min -40 °C
- Probe Diameter 0.25 in
- Probe Length 5.75 in
- Series ID RTD-Immersion-No-Well
- Temperature Measurement Range -40 to 115°C
Supported Applications
The ACI Platinum Immersion Series (No Well) provides temperature sensing for HVAC and room monitoring applications. These sensors are designed to be installed into an existing thermowell or a separately ordered machined/welded thermowell, featuring a standard ½ in NPT process thread connection. The series is specified for use with Air/Gas/Steam and Water media; the documentation explicitly notes that Glycol or other chemicals are not supported.
ACI recommends these sensors for integration with building management systems (BMS) or Programmable Logic Controllers (PLC). When used in a 3-Wire configuration, the third wire compensates for external lead wire resistance affecting sensor output. The series utilizes ACI's double encapsulation process to eliminate moisture effects and increase thermal response times.
Operating Conditions & Performance
The sensors operate within a measurement range of -40 °C to 200 °C (-40 °F to 392 °F). Ambient operating temperature is rated from -40 °C to 85 °C (-40 °F to 185 °F), with storage conditions matching this ambient range. Humidity tolerance is specified as 10 % to 95 % RH, non-condensing.
Performance accuracy follows Class A standards: ± 0.15 °C + (0.002 * |t|) where |t| is the absolute value of Temperature above or below 0 °C in °C. Specific tolerance points include:
- -40 °C (-40 °F): ± 0.23 °C (± 0.414 °F)
- 0 °C (32 °F): ± 0.15 °C (± 0.27 °F)
- 200 °C (392 °F): ± 0.55°C (± 1.00 °F)
The nominal response time is 8 seconds for a 63 % step change. The probe diameter measures 6.35 mm (0.25 in). Electrical connections utilize Etched Teflon (PTFE) Colored Leads per Mil Spec 16878/4 Type E with Silver Plated Copper connectors.
Configuration Options
The series offers extensive configuration options across sensor elements, wiring, insertion lengths, and enclosure types. While the current ecommerce listing includes specific Plastic Box (PB) variants, the full series supports a broader envelope of configurations documented in the ordering guide.
- Sensor Elements: 100 Ω Platinum RTD or 1 kΩ Platinum RTD.
- Wiring Configurations: Two Wires (2W) or Three Wires (3W).
- Insertion Lengths: Available from 1 in to 24 in, including specific lengths of 1", 2.5", 4", 6", 8", 12", 18", and 24".
- Enclosures & Ratings:
- PB: Plastic Box
- GD: Galvanized Steel (NEMA 1 / IP10)
- BB: Aluminum, NEMA 3R
- 4X: NEMA 4X (IP 66), UL94-5VB Plenum Rated
- Certifications: CE, UKCA, RoHS2, WEEE. Optional NIST Certificates (3 Points) are available.
The "INW" configuration includes a standard ½ in NPS process thread for use with optional machined thermowells or existing installations. Machined Thermowells of lengths 12", 18", and 24" meet ASME PTC 19.3 TW-2016 Code B31.1.
Key Product Differences
The series distinguishes between three primary configurations based on the thermowell integration:
- I (Immersion with Welded Thermowell): Includes a welded thermowell; insertion lengths typically start at 4".
- IM (Immersion with Machined Thermowell): Includes a machined thermowell; available in various materials including 304 and 316 Stainless Steel for specific lengths.
- INW (Immersion without Thermowell): The sensor probe is supplied without a thermowell, featuring the standard process thread to mate with an existing or separately ordered thermowell. This configuration supports insertion lengths from 1" up to 24".
Housing materials vary by enclosure code: Galvanized Steel (GD), ABS Plastic/Polystyrene (PB), Aluminum (BB), and NEMA 4X rated housings. Wetted materials include 304 Stainless Steel for the sheath and Polyamide 66 (High Performance Nylon 66) | UL94-HB components.
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