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Low & High Temperature Calibration Bath
A New Generation of Intelligent Constant Temperature Equipment
DEARTO intelligent precision calibration bath series contains high temperature oil bath (300℃) and ultra-low temperature calibration bath (-100℃), DEARTO calibration bath has advanced temperature control technology, temperature stability (±0.01℃), temperature uniformity (±0.01℃).DTS-CT series calibration bath has become the preferred choice for temperature calibration in laboratories.
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Product Profile
DTS-CT series low-temperature calibration bath, can provide -100 ℃, -80 ℃, -60 ℃, -40 ℃ and other low-temperature points of the test calibration, while supporting 300 ℃, 560 ℃ and other high-temperature points of the calibration, according to the different needs of the measurement of the choice of different models of equipment, to achieve high-precision temperature stabilization and regulation, just through the touch screen one-key start setting, real-time remote monitoring, greatly improve the Work efficiency and data accuracy.

Liquid Calibration Bath Series Product Selection Table

 
Product number DTS-CT300G DTS-CT95G DTS-CT01G DTS-CT10G
Temperature range (°C) 70~300 RT+10~95 0~100 -10~100
Fluctuation (℃/10min) ±0.007 ±0.01 ±0.01 ±0.01
Uniformity(℃)) ≤0.01 ≤0.01 ≤0.01 ≤0.01
Working medium silicone oil soft water, antifreeze antifreeze
Volume(L) 23 18.5 18.5 18.5
Work area size(mm) Φ150×480 Φ130×480
Dimensions(mm) 660(L)×540(W)×1120(H)
Intelligent Low Temperature Calibration Bath
Product number DTS-CT30G DTS-CT40G DTS-CT60G DTS-CT80G
Temperature range (°C) -30~100 -40~100 -60~100 -80~100
Fluctuation (℃/10min) ±0.01 ±0.01 ±0.01 ±0.01
Uniformity(℃)) ≤0.01 ≤0.01 ≤0.01 ≤0.01
Working medium antifreeze Absolute ethanol
Volume(L) 18.5 18.5
Work area size(mm) Φ130×480 Φ130×480
Dimensions(mm) 660(L)×540(W)×1120(H) 700(L)×590(W)×1120(H)
 

Triple Point of Water Maintenance Bath

 
Product numbe DTF-CT01SG DTF-CT30SG DTF-01SG DTF-30SG DTF-01G
Temperature range (°C) -10~105 -30~105 -10~105 -30~105 -10~105
Way to control Intelligent Screen Control Precision Instrument Control Regular Control
Product type One bath for three purposes (water triple point freezer, water triple point saver, refrigeration calibration bath) Standard type
Fluctuation (℃/30min) ±0.005
Uniformity(℃)) ≤0.01
Working medium antifreeze
Frozen quantity (branches) 1~3
Dimensions (mm) 660(L)×540(W)×1120(H)

 

 

 

Calibration Bath: Guide

The calibration bath is liquid, molten salt or molten pure metal as the medium, through the action of temperature control system and stirring or spraying device. Reach the set temperature and maintain uniform temperature in its inner working area. It is mainly used to detect and calibrate the constant temperature equipment required for various thermometers or other measuring instruments.
Commonly used media for calibration baths are water, silicone oil, antifreeze, absolute ethanol, tin, salt, etc., which respectively constitute alcohol low-temperature calibration baths, water baths, oil baths, high-temperature tin baths, and high-temperature salt baths.
Learn More

 

1. What Is a Temperature Bath For Calibration?

A temperature calibration bath is a calibrator having a uniform fluid enclosure that can be adjusted to specific temperatures for test points. They offer large volume and flexibility for calibrating temperature sensors that are different shapes and sizes.

 

2. What is the Temperature Range of a Bath Calibrator?

Bath suppliers typically publish and advertise a temperature range for each model. However, it’s essential to note that no single bath fluid works well over the entire temperature range.
 
For example, a Fluke Calibration 7341 Deep-Well Compact Bath has a range from -45 °C to 150 °C1. Here are some considerations:
 
● Below 0 °C: For temperatures below 0 °C, candidate bath fluids include Halocarbon, HFE, methanol, ethanol, ethylene glycol, Dynalene, and certain silicone oil types.
 
● Above 0 °C: At temperatures above 0 °C, several silicone oil types, water, and mineral oil can be used.
 
● Extremely Hot Temperatures: For temperatures above 300 °C, salt is a preferred option.
 
Viscosity: The viscosity of the bath fluid matters. Lower viscosity fluids (around 50 centistokes or less) are recommended for better heat transfer and uniformity.
 
Homogeneous Temperature: Achieving a homogeneous temperature within the “calibration zone” of the bath is crucial for low uncertainty calibrations.

 

3. How Do You Check Temperature Calibration?

Temperature calibration is a crucial process for ensuring the accuracy of temperature measurements in various applications. Here’s a general guide on how to perform temperature calibration:
 
1. Select a Reference Standard: Choose a reference standard with higher accuracy than the sensor being calibrated. This could be a calibrated thermometer, a temperature bath, or a temperature-controlled chamber.
 
2. Pre-Calibration Preparation: Ensure that the temperature sensor and reference standard are at thermal equilibrium to minimize errors due to temperature gradients. Allow sufficient time for both devices to stabilize.
 
3. Data Collection: Subject the temperature sensor and reference standard to a series of temperature points across the desired range. Record the output readings from both devices simultaneously.
 
4. Comparison and Analysis: Compare the output readings of the temperature sensor with the reference standard readings. Calculate the differences or measurement errors at each temperature point. Employ statistical analysis techniques, such as linear regression or polynomial fitting, to determine correction factors or calibration curves.
 
5. Adjustment and Compensation: Apply the correction factors or calibration curves to compensate for the observed measurement errors. These adjustments can be made through software or hardware modifications, depending on the sensor type and application.
 
6. Document the Calibration: Record all calibration procedures, results, and any adjustments made. This documentation is essential for traceability and future calibrations.

 

4. What is a Temperature Bath Used For?

A temperature bath is a piece of laboratory equipment that precisely controls the temperature of a fluid, most commonly water. This heated fluid bath is then used for various purposes, including:
 
Incubation: In biology, temperature baths are used to create ideal temperature environments for cell cultures or organisms. This allows them to grow and thrive under controlled conditions. 
 
Chemical reactions: Specific chemical reactions require precise temperature control to proceed. A temperature bath can provide this consistent and stable environment for predictable results.
 
Sample heating/thawing: Temperature baths can be used to gently heat or thaw samples. This is particularly useful for biological samples that can be damaged by freezing or overheating.
 
Sensor calibration: Temperature baths are used to calibrate thermometers and other temperature sensors by exposing them to a known and stable temperature.
 
There are different types of temperature baths, some offering a wider temperature range or using different fluids besides water. But their core function remains maintaining a consistent thermal environment for various laboratory applications.

 

5. Why Do We Use Kerosene In Low Temperature Calibration Bath?

While kerosene was once commonly used in low-temperature calibration baths, its use has largely been replaced by other fluids due to safety concerns and environmental considerations. However, it's still helpful to understand why kerosene was initially preferred and what its limitations are.

 

Why kerosene was used:

Wide liquid range: Kerosene remains liquid across a relatively wide temperature range, from around -40°C to 250°C. This allowed for a single fluid to be used for calibrating instruments across a broad spectrum of low temperatures.

Good heat transfer: Kerosene has decent thermal conductivity, meaning it efficiently transfers heat to the instruments being calibrated, ensuring accurate and consistent temperature readings.

Readily available: Kerosene was historically a readily available and relatively inexpensive fluid, making it a practical choice for calibration baths.

 

Limitations of kerosene:

Safety hazards: Kerosene is a flammable liquid with a flash point around 38°C. This poses a significant fire risk, especially in enclosed laboratory settings.

Environmental concerns: Kerosene is a petroleum-based product, and its use and disposal raise environmental concerns. Spills can contaminate soil and water, and improper disposal can contribute to air pollution.

Health risks: Kerosene vapors can be harmful if inhaled, and prolonged exposure can irritate the skin and eyes.

 

Modern alternatives:

Silicone oils: These synthetic oils offer a wider temperature range than kerosene, typically from -70°C to 200°C, while being non-flammable and much less harmful to the environment.

Glycols: Certain glycol-based fluids, like ethylene glycol, are also suitable for low-temperature calibration baths, with good thermal properties and non-flammability.

Alcohol mixtures: For even lower temperatures, mixtures of alcohols like ethanol and methanol can be used, reaching down to -90°C. However, they require special precautions due to their high flammability.

 

6. High Temperature Calibration Bath Vs Low Temperature Calibration Bath

Feature High-Temperature Baths Low-Temperature Baths
Temperature Range Typically above 300°C Typically from -80°C to 200°C
Fluid Choices Molten salts, molten metals, high-temperature oils Silicone oils, ethylene glycol, alcohol mixtures
Construction Materials Stainless steel, ceramics, refractory materials Stainless steel, aluminum, plastic
Applications Aerospace, metallurgy, chemical processing, energy production Pharmaceutical research, cryogenic testing, food processing, environmental monitoring
Safety Considerations Strict Lower
Selection Consider temperature range, instrument compatibility, safety requirements, budget, environmental impact Consider temperature range, instrument compatibility, safety requirements, budget, environmental impact

 

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