RTD-NPT

Supported Applications

The Omega RTD-NPT Series consists of Dual Element and single-element Pipe Plug RTD Sensors designed for temperature measurement in pressure vessel applications. These probes are engineered to operate at pressures up to 172 bar (2500 psi) Max.

Operating Conditions & Performance

The series utilizes high-accuracy 100 Ω Class 'A' DIN platinum sensing elements with a 3-wire construction suitable for handheld instruments. Process temperature capabilities span two primary ranges depending on the cable insulation: up to 230°C (450°F) and up to 480°C (896°F). The probe features an SST (Stainless Steel) sheath, with a stem length of 12.7 mm (0.5") and a diameter of 6 mm (0.24"). Wetted materials include the Stainless Steel Probe and Nickel-plated copper conductors.

Key Performance Specifications

• Sensing Element: 100 Ω Class 'A' DIN platinum
• Electrical Connection: 3-wire construction
• Maximum Pressure Rating: 172 bar (2500 psi) Max
• Temperature Ranges: Up to 230°C (450°F); up to 480°C (896°F)
• Housing Material: SST (Stainless Steel)

Configuration Options

The RTD-NPT series is configurable across mounting threads, cable lengths, insulation types, and termination options to accommodate specific installation requirements.

Mounting Threads & Process Connections

• NPT thread sizes: 1/4 NPT and 1/8 NPT

Cable Insulation & Temperature Ratings

Cable insulation is selected based on the maximum operating temperature:

• PFA insulated lead wires: Used for models rated to 230°C (450°F).
• Fiberglass insulated cables: Used for high-temperature models rated to 480°C (896°F), designated with the '-HT' suffix.
• SST braided fiberglass insulation: Available on specific dual-element configurations, such as RTD-NPT-72-E-DUAL-1/4-MTP-HT-S.

Termination Options & Connectors

The series supports various electrical terminations. Standard options include MTP connectors and OTP connectors (add '-OTP' to model number). TA3F Audio Connectors are available by adding the '-TA3F' suffix, while stripped leads can be specified by removing the connector designation from the model number.

• Mating Connector Model No.: MTP-U-F
• Cable Clamp Model No.: PCLM-MTP (sold separately)

Sensor Configurations

The series is available in both single-element and dual-element configurations.

• Dual Element RTD Pipe Plug Sensors: Identified by the '-DUAL' designation in model numbers.
• Single Element Pipe Plug RTD Sensor: Standard configuration without the '-DUAL' suffix.

Key Product Differences

The primary distinction within the series is between single-element and dual-element sensing configurations. Dual-element models, such as those in the 'RTD-NPT-72-E-DUAL...' family, provide two independent 100 Ω Class 'A' DIN elements within a single probe body.

Model Number Construction

The series follows a specific model number guide: RTD - NPT - Cable Length - Temperature Coefficient - Mounting Thread - Termination Option - Temperature Range - Cable Option. For example, RTD-NPT-72-E-DUAL-1/8-MTP-HT-S denotes a dual-element probe with 72" cable length, E coefficient, 1/8 NPT thread, MTP connector, high temperature rating (HT), and SST braided fiberglass insulation.

Accessory Compatibility

The series is compatible with various Omega instrumentation including the CN1A meter, DP461-RTD panel meter, iDRX/iDRN signal conditioners, DRF-RTD signal conditioner, CN3271-R1 high/low limit controller, DP25B-RTD ¼ DIN panel meter, SPRTX 4 to 20 mA transmitter, and TX92 transmitter. All accessories are sold separately.