Nuclear Control Systems - Direct Immersion Sensors

The direct immersion temperature sensor is designed and tested to be installed directly into process piping. This sensor has been environmentally and seismically qualified for use in 1E (or RCC-E Zone K2 ) applications in nuclear power generating stations.

The direct immersion design is extremely rugged. The material selection and configuration of this unique sensor ensures longer installed life at elevated temperatures providing lower cost of ownership.

Models are available that mount directly into the primary coolant loop of Pressurized Water Reactors or directly into RTD by-pass manifolds. These models provide an extremely fast response time.

The RTDs are supplied in accordance with a Quality Assurance Program which is ISO 9001:2000 Registered. The program is also in compliance with 10CFR50 Appendix B, ANSI N45.2 and ASME NQA-1 or RCC-E.

These sensors can be ordered as non-safety related, offering the same reliability and construction as the safety related version but at much lower cost.

Application assistance is available for special applications and design requirements. Assistance includes physical configuration requirements such as connection head types, leadwire length, connector, mechanical mounting and other physical details. Actual installation details can affect measurement accuracy and response time.

Specification
Documentation

Specification

Direct Immersion Sensors

Performance Specifications

Operating Temperature Range

0°F to 750°F (-18°C to 400°C)

Accuracy/Calibration

Standard sensor accuracy follow normal IEC 60751 Class B. Consult factory if Class A or other special accuracy requirements are needed. Sensor specific calculated calibration tables of resistance versus temperature are provided. The specific calibration table can be used to obtain sensor accuracies of ±0.3°F (±0.17°C).

Drift/Stability

Sensor drift is less than 1°F (0.56°C) over 40 years

Response Time

The response time for each sensor is 5 seconds or less as verified by a plunge test in accordance with ASTM E644 per 63.2% step change. Faster response times are available upon request, depending on the model being ordered.

Insulation Resistance

At room temperature and dry external surfaces, the insulation resistance between any terminal and the sensor case will exceed 100 Megohms with 100 VDC applied

Operating Current

A continuous current of no greater than 20 milliamp (RMS) will not damage the sensor. Standard operating current is 1 to 4 milliamps

Self Heating

In 68°F (20°C) water flowing transverse to the sensor sheath at 3 feet per second, an RTD with a sheath diameter of 0.25 inch is capable of dissipating a minimum of 50mW without causing an indicated temperature rise of more than 1.8°F (1°C).

Environmental/Seismic Qualification

(Applicable Qualification/Test reports are available upon request)

RTDs are qualified to IEEE-323 1974 & 1983, and IEEE-344 1975 & 1987 and NUREG 0588 for a design life of 40 years. The RTD assembly will withstand up to 300 Megarads T.I.D. and LOCA conditions. Seismic capability of the RTD is 20g maximum acceleration in the horizontal and vertical plane from 1 to 33 Hz.

RTDs qualified to RCC-E K2 are available with requirements specific to RCC-E.

Documentation

Please use the links below to view the available documentation.

Product Sheets

Direct Immersion Temperature Sensor

40 Years Qualified Life
0° to 750°F (-18° to 400°C) Temperature Range
(Consult factory for other ranges)
Accuracy to Meet IEC 60751 Class B
Fast Response Time Available
IEEE 323-1974 & 1983 and IEEE 344-1975 & 1987or RCC-E for Zone K2
Low Calibration Drift
Available for Non-safety Related Applications

Performance Specifications

Operating Temperature Range	0°F to 750°F (-18°C to 400°C)
Accuracy/Calibration	Standard sensor accuracy follow normal IEC 60751 Class B. Consult factory if Class A or other special accuracy requirements are needed. Sensor specific calculated calibration tables of resistance versus temperature are provided. The specific calibration table can be used to obtain sensor accuracies of ±0.3°F (±0.17°C).
Drift/Stability	Sensor drift is less than 1°F (0.56°C) over 40 years
Response Time	The response time for each sensor is 5 seconds or less as verified by a plunge test in accordance with ASTM E644 per 63.2% step change. Faster response times are available upon request, depending on the model being ordered.
Insulation Resistance	At room temperature and dry external surfaces, the insulation resistance between any terminal and the sensor case will exceed 100 Megohms with 100 VDC applied
Operating Current	A continuous current of no greater than 20 milliamp (RMS) will not damage the sensor. Standard operating current is 1 to 4 milliamps
Self Heating	In 68°F (20°C) water flowing transverse to the sensor sheath at 3 feet per second, an RTD with a sheath diameter of 0.25 inch is capable of dissipating a minimum of 50mW without causing an indicated temperature rise of more than 1.8°F (1°C).
Environmental/Seismic Qualification (Applicable Qualification/Test reports are available upon request)	RTDs are qualified to IEEE-323 1974 & 1983, and IEEE-344 1975 & 1987 and NUREG 0588 for a design life of 40 years. The RTD assembly will withstand up to 300 Megarads T.I.D. and LOCA conditions. Seismic capability of the RTD is 20g maximum acceleration in the horizontal and vertical plane from 1 to 33 Hz. RTDs qualified to RCC-E K2 are available with requirements specific to RCC-E.