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Nuclear
Qualified Temperature Sensors
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Weed Instrument is the world's largest supplier of nuclear
qualified RTDs and thermocouple temperature sensors.
Qualifications are to IEEE and NUREG standards. These
sensors can withstand 20G's, 300 Megarads T.I.D., LOCA
and are available in many standard or custom configurations,
such as thermowell mounted, strap-on, direct immersion,
fast time response, and atmospheric styles. Many optional
features are available, such as a unique, qualified
quick disconnect connector that allows for reduced installation
and maintenance times.
Our temperature sensors for nuclear applications
include:
- General
use Models 601 & 611 RTDs for direct immersion
-
General use Thermocouples for direct immersion
-
General use Models 602, 612, & 615 Spring Loaded
RTDs for thermowell mounting
-
General use Spring Loaded Thermocouples for thermowell
mounting
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Wide Range Model N9001 RTD for thermowell mounting
-
Surface mount Model N9002 RTD for strap on mounting
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N9004 Fast Time Response RTD
- Thermowell
Mounted
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Temperature Range 0-750 ¼F (-18 to 400 ¼C)
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Accuracy as good as ±0.3 ¼F
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40 Years Qualified Life
-
IEEE 323 1974 & 1983, IEEE 344 1975 & 1987
Qualified
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Time Response Less Than 4 Seconds in Fast Response
Thermowell
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Interchangeability
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No Heat Transfer Media Required
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Low Calibration Drift
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LCSR Validated for In Situ Testing
Model
N9004 is a tapered tip RTD designed to be installed
in a special Weed-designed thermowell for rapid detection
of temperature changes in the primary coolant loop of
PWR (Pressurized Water Reactor) type nuclear power generation
facility. Because there is no need for a heat transfer
media or qualified conduit seal fittings, installation
is made quickly and easily. This also allows any N9004
RTD to be used in any Fast Response Thermowell for complete
interchangeability. The low calibration drift extends
the recalibration intervals thus reducing maintenance
requirements. RTDs are supplied in accordance with Weed
Instrument’s Quality Assurance Program which is
ISO 9001 Registered. The program is also in compliance
with IOCFR50 Appendix B, ANSI N45.2 and ASME NQA-1.
Applications assistance is available for special applications
and design requirements. Assistance includes physical
configuration requirements such as connection head types,
leadwire length, quick disconnects, and other physical
details. Actual installation details can affect measurement
accuracy and response time. Such things as RTD fit into
the thermowell, thermowell design and RTD assembly spring
compression may cause variations in accuracy and response
times. For the best performance consult Weed for application
assistance.
| Item |
Item
Specifications |
Operating
Temperature
Range |
0
°F to 750 °F (-18 °C to 400 °C) |
| Accuracy/Calibration |
Standard
sensor accuracy is ±0.5 °F (0.28 ¼C)
or 0.25% of the temperature being measured, whichever
is greater. Standard calibration points are 32 °F,
212 °F and 554 °F (0 °C, 100 °C
and 290 °C). (Other calibration points can be
performed upon customer request.) Sensor specific
calculated calibration tables of Resistance vs.
Temperature can be provided from 0 °F to 750
°F in 1 °F (or 1 °C) increments. When
using these calibration table values accuracy is
within ±0.3 °F inclusive of hysteresis
and repeatability. |
| Drift/Stability |
Sensor
drift is less than 1 °F (0.56 ¼C) over 40 years |
| Response
Time |
The
response time for each sensor is 4 seconds or less
in a clean, dry thermowell as verified by a plunge
test in accordance with ASTM E644 per 63.2% step
change. Faster response times are available upon
request. |
| Insulation
Resistance |
At
room temperature and dry external surfaces, the
insulation resistance between any wire and the sensor
case will be 100 Megohms, or greater, with 100 VDC
applied |
| Operating
Current |
A
continuous current of 20 milliamps (RMS) or less
will not damage the sensor. Standard operating current
is 1 to 4 milliamps |
| Self
Heating |
In
154 ¼F (20 °C) water flowing transverse to the
sensor sheath at 3 feet per second, with a sheath
diameter of 0.25 inch, the RTD will be capable of
dissipating 10mw/°C without causing an indicated
temperature rise of more
than 0.36 ¼F (0.2 °C). |
| Self
Heating Error |
The
error caused by self heating is less than 1.8 ¼F
(1 ¼C) for 60 mw dissipation |
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 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. |
| Storage |
Storage
of the RTD should be in accordance with ANSI N45.2
Level B |
| Shipping
Weight |
Approximately
4 pounds with single port connection head |
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