Probe / Closed Tube Thermistors
Last Updated: April 1, 2025
Description
Probe or closed tube thermistors are temperature sensors that measure temperature by detecting changes in electrical resistance. These devices are typically enclosed in a protective tube or probe, which shields the thermistor element from environmental factors, ensuring accurate and reliable temperature readings.
Working Principle
Thermistors operate based on the principle that their electrical resistance changes with temperature. There are two main types of thermistors: negative temperature coefficient (NTC) and positive temperature coefficient (PTC). NTC thermistors decrease in resistance as temperature increases, while PTC thermistors increase in resistance with rising temperature. This change in resistance is nonlinear, meaning that small changes in temperature can result in large changes in resistance, making thermistors highly sensitive and accurate for temperature measurement.
Applications
Probe or closed tube thermistors are used in a variety of applications where precise temperature monitoring is crucial. They are commonly found in household appliances, such as refrigerators and ovens, where they help maintain optimal operating temperatures. In industrial settings, they are used in HVAC systems to monitor and control environmental conditions. Additionally, thermistors are employed in medical devices, such as incubators and patient monitoring systems, to ensure accurate temperature readings.
Advantages over other Thermistors
Probe or closed tube thermistors offer several advantages over other types of thermistors. Their enclosed design provides protection against environmental factors, enhancing durability and reliability. This makes them suitable for applications where exposure to moisture, dust, or chemicals is a concern. Additionally, their high sensitivity and accuracy make them ideal for applications requiring precise temperature control.
Limitations
Despite their advantages, probe or closed tube thermistors have limitations. They have a limited temperature range, typically between -100°F and +500°F, which may not be suitable for extreme temperature applications. Their non-linear response can also complicate the measurement process, requiring specialized equipment for accurate readings. Furthermore, they are not as rugged as some other temperature sensors, which can limit their use in harsh environments.
Considerations
When selecting probe or closed tube thermistors, several factors should be considered. Initial costs can be higher compared to other temperature sensors, but their accuracy and sensitivity may justify the investment for applications requiring precise measurements. Operating expenses are generally low, as thermistors are energy-efficient and require minimal maintenance. However, their durability can be a concern in extreme conditions, potentially leading to higher replacement and maintenance costs. Accuracy is a significant advantage, but the non-linear response may necessitate additional calibration or specialized equipment.
from DigiKey
NTC Thermistor 10k Cylindrical Probe, Glass [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -60 to 300
- Coating: Glass
from DigiKey
NTC Thermistor 1k Cylindrical Probe, Glass [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 1000
- Temperature Range: -60 to 300
- Coating: Glass
from DigiKey
NTC Thermistor 10k Cylindrical Probe, Stainless Steel [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -55 to 105
- Beta: 3892
from DigiKey
10K OHM NTC SS PROBE SENSOR WITH [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -55 to 300
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 105
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 105
from DigiKey
NTC Thermistor Probe [See More]
- Housing: Probe/Closed Tube
- Temperature Range: -40 to 105
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 105
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 180
- Coating: Glass
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 200
from DigiKey
NTC Thermistor 100k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 100000
- Temperature Range: -30 to 120
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -30 to 120
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -30 to 120
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: 0 to 70
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: 0 to 70
from DigiKey
NTC Thermistor 2.252k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 2252
- Temperature Range: 0 to 70
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -35 to 105
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 125
from DigiKey
NTC RECTANGLE MOTOR TEMPERATURE [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 96000
- Temperature Range: -40 to 200
from DigiKey
NTC CYLINDER MOTOR TEMPERATURE S [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 200
from DigiKey
PRO2- FSR20301061 [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 105
from DigiKey
NTC Thermistor 2k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 2000
- Temperature Range: -40 to 125
from DigiKey
GLASS NTC MOUNTING -10K1% B3600 [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: -40 to 250
- Beta: 3600
from DigiKey
NTC Thermistor 10k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 10000
- Temperature Range: 0 to 50
from DigiKey
NTC Thermistor 2.252k Probe [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 2252
- Temperature Range: 0 to 50
from Thermik Corporation
With connector cables. Fully insulated in a screw on housing [See More]
- Housing: Probe/Closed Tube
- Package / Electrode Type: Chip/Surface
- Temperature Range: 70 to 180
- Lead Style: Radial
from OMEGA Engineering, Inc.
The HSTH Series Flexible Thermistor Sensors are hermetically sealed at the sensor tip to provide continuous protection from corrosive environments. This unique Thermistor temperature probe design provides a small, flexible, and electrically isolated Thermistor element, suited to a variety of... [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 2252 to 10000
- Temperature Range: -80 to 150
- Thermal Time Constant: 3.75
from Hanna Instruments, Inc.
Probe for air & gasses with a 10 meter cable [See More]
- Housing: Probe/Closed Tube
- Package / Electrode Type: Bead
- Temperature Range: -50 to 150
- Lead Style: Radial
from HydraForce, Inc.
DESCRIPTION. A thermistor style heavy-duty analog temperature sensor with a padded resistor for improved linearity of the input curve. This steady-state sensor is intended for use in demanding industrial and off-highway equipment applications. FEATURES. • Thermistor technology for low cost and... [See More]
- Housing: Probe/Closed Tube
- Resistance (@25°C): 4300
- Temperature Range: -40 to 150
- Accuracy: 2