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Weed Instrument is the world's largest supplier of nuclear qualified RTDs and thermocouple temperature sensors. Qualifications are to IEEE, RCC-E and NUREG standards. Most of the sensors can withstand 20G's and 300 Megarads T.I.D. They are available various configurations such as thermowell mounted, strap-on, direct immersion, fast time response and atmospheric styles.

Many optional features are available and include a fully qualified quick connect/disconnect connector that allows for reduced installation and maintenance time within the containment area.

Model N9339 RTD The Model N9339 Flexible RTD is specially designed for use in Channel Temperature monitoring in CANDU design power plants. The design incorporates modern
materials which result in a high accuracy and low drift. Whether being used in new plant construction or replacement parts, the Weed design is unmatched in engineering and application flexibility.

The flexible RTD utilizes a multi-pin connector and a spring loaded design for maximum ease
of use when installing or removing the sensor. The design incorporates standard RTD lengths for use with various length RTD to Thermowell adapters, in order to minimize the number of spare parts that have to be kept in stores.

RTDs can be supplied in the standard lengths with the adapter fittings or can be supplied
in custom lengths. RTDs are supplied in accordance with Weed Instrument's Quality Assurance Program which is ISO-9001 registered. The Program is also in compliance with CSA Z299.1, ASME NQA-1 & 10CFR50 Appendix B.

The Weed flexible RTD has an upgraded design that uses modern, but proven materials. The sheath material is stainless steel, while the insulation material is MgO, which compacts better than Al2O3 since it has a smaller grain size. This means that an MgO filled cable has greater stability. The internal lead wires are Constantan, as opposed to nickel clad silver wire, which needs great care in manufacturing since a change in resistance can occur due to bending. Nickel clad silver also leads to a long term problem with silver migration in some applications. The Constantan eliminates both the silver migration and the varying resistance problems. This combination of materials has been successfully used in nuclear power.

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About Weed Instrument:

Since the founding of Weed Instrument in 1968, we have been a leading player in defining and growing several unique technology markets. From custom design, high volume temperature sensors for OEM applications to high performance products for the nuclear power generation and industrial automation markets, Weed helps keep industry and business around the globe up and running.

Our typical customers and users include technicians, engineers and industrial automation network professionals — people who stake their reputation on the products and technologies we supply.

Guiding all our efforts is a simple philosophy rooted in four customer focused priorities: Quality, Delivery, Cost and Innovation.

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