Low and High Temperature Calibration Bath

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Calibration Bath
A New Generation of Intelligent Constant Temperature Equipment

Relying on the long-term accumulated market experience and innovative technology, it has realized the excellent performance of the product and provided a variety of professional solutions for the majority of users. industry, DTS-series calibration baths have become an ideal choice for laboratory temperature calibration.

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Product Profile

Relying on the long-term accumulated market experience and innovative technology, the testo calibration bath series has realized the excellent performance of the product and provided a variety of professional solutions for the majority of users. , machinery, transportation and other industries, DTS-series constant temperature bath has become an ideal choice for laboratory temperature calibration

Oil Bath for Temperature Calibration

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Intelligent Calibration salt bath

Triple Point of Water Maintenance Bath DTFG

Super Large Diameter Calibration Baths

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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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