The AMETEK CTC-650B is a compact dry block temperature calibrator designed for accurate, efficient and reliable temperature sensor calibration in industrial environments, calibration laboratories and field service applications.

With a temperature range from 33 °C to 650 °C, an internal reference accuracy of ±0.6 °C and excellent temperature stability of ±0.05 °C, the AMETEK CTC-650B provides reliable performance for professional temperature calibration.

The instrument combines a specially designed heating block with advanced temperature regulation and MVI technology to ensure stable calibration conditions, even when the mains power supply fluctuates.

Its immersion depth of 190 mm makes the calibrator particularly suitable for temperature sensors with longer sensing elements, including liquid filled thermometers and mechanical temperature switches.

The AMETEK CTC-650B features interchangeable calibration inserts, automatic temperature stepping, integrated temperature switch testing and an RS-232 communication interface.

With a heating time of approximately 39 minutes from 23 °C to 650 °C, the calibrator provides efficient temperature generation for industrial calibration applications.

The compact construction and straightforward operation make the instrument suitable for both laboratory and field calibration.

europascal supports customers with professional temperature calibration equipment, technical advice and calibration services.

For professional calibration and metrological traceability, visit the europascal Calibration Service.

Your Benefits at a Glance

The AMETEK CTC-650B combines a wide temperature range with reliable performance and convenient operation.

Its main advantages include:

• Temperature range from 33 °C to 650 °C
• Internal reference accuracy of ±0.6 °C
• Excellent temperature stability of ±0.05 °C
• Specially designed heating block
• MVI technology for improved temperature stability
• Immersion depth of 190 mm
• Calibration well diameter of 26 mm
• Interchangeable calibration inserts
• Brass inserts for excellent thermal performance
• Heating from 23 °C to 650 °C in approximately 39 minutes
• Cooling from 650 °C to 100 °C in approximately 65 minutes
• Typical stabilization time of 8 minutes
• Temperature resolution of 0.1 °C
• Automatic temperature stepping with up to nine steps
• Integrated temperature switch testing
• Automatic determination of switching hysteresis
• Adjustable temperature stability criteria
• Configurable maximum temperature limit
• Backlit LCD display
• RS-232 communication interface
• Compatible with JofraCal calibration software
• Portable construction weighing approximately 10.5 kg
• Suitable for RTDs and thermocouples
• Suitable for liquid filled thermometers
• Suitable for mechanical temperature switches
• Professional calibration support from europascal

Ideal for Demanding Calibration Applications

The AMETEK CTC-650B is designed for professional temperature calibration applications requiring a wide temperature range and reliable temperature stability.

The instrument is particularly suitable for calibrating industrial temperature sensors operating at elevated temperatures.

Typical applications include:

• Pt100 calibration
• Pt1000 calibration
• RTD calibration
• Thermocouple calibration
• Digital thermometer verification
• Mechanical thermometer calibration
• Liquid filled thermometer calibration
• Temperature switch testing
• Industrial temperature measurement
• Process instrumentation maintenance
• Production quality assurance
• Calibration laboratory applications

The dry block design eliminates the need for calibration liquids.

This simplifies transportation, preparation and maintenance compared with conventional liquid calibration baths.

Interchangeable calibration inserts allow different sensor diameters to be accommodated.

The deep calibration well is particularly useful for sensors requiring a relatively large immersion depth.

Temperature Range up to 650 °C

The AMETEK CTC-650B provides a temperature calibration range from:

33 °C to 650 °C

This wide temperature range covers numerous industrial applications requiring accurate temperature measurements at elevated temperatures.

Typical calibration temperatures include:

50 °C

100 °C

150 °C

200 °C

250 °C

300 °C

400 °C

500 °C

600 °C

650 °C

The temperature range is specified under the manufacturer’s defined ambient conditions.

The AMETEK CTC-650B is particularly suitable for calibrating sensors used in industrial heating systems, ovens, production equipment and thermal processes.

Its maximum temperature of 650 °C allows calibration of temperature sensors operating beyond the range of many conventional compact temperature calibrators.

For demanding calibration applications, sufficient stabilization time must be allowed before recording measurement results.

Temperature Accuracy of ±0.6 °C

The manufacturer specifies an internal reference accuracy of:

±0.6 °C

This specification describes the accuracy of the temperature generated and indicated by the calibrator under the manufacturer’s defined conditions.

It must not be confused with temperature stability.

For more demanding comparison calibrations, a suitable external reference thermometer can be used.

The external reference thermometer measures the actual temperature within the calibration insert.

The device under test can then be compared with the reference thermometer.

The AMETEK CTC-650B does not have an integrated external reference thermometer input.

An appropriate external thermometer readout is therefore required.

The measurement uncertainty of the complete calibration system must be evaluated according to the applicable calibration procedure.

Excellent Temperature Stability of ±0.05 °C

The AMETEK CTC-650B provides excellent temperature stability.

The manufacturer specifies:

±0.05 °C

Temperature stability describes the variation of the calibration block temperature over time under defined operating conditions.

According to the manufacturer, the stability specification is evaluated after the stability indicator has been active for ten minutes.

The subsequent measurement period is 30 minutes.

Stable temperature conditions are essential for reliable temperature sensor calibration.

Temperature fluctuations during calibration can influence the measured temperature difference between the reference thermometer and the device under test.

The excellent stability of the AMETEK CTC-650B helps minimize this contribution.

Specially Designed Heating Block

The AMETEK CTC-650B features a specially designed heating block.

The heating elements and block geometry are optimized to provide efficient temperature transfer and good temperature homogeneity.

The manufacturer uses a nonlinear heating element design together with an increased block mass.

This helps provide a homogeneous temperature distribution throughout the calibration block.

Good temperature homogeneity is particularly important when calibrating sensors with longer sensing elements.

For accurate calibration, the sensing element should be exposed to a sufficiently uniform temperature.

Temperature gradients can cause measurement errors, particularly when calibrating mechanical or liquid filled thermometers.

The design of the AMETEK CTC-650B helps reduce these effects.

Immersion Depth of 190 mm

The AMETEK CTC-650B provides an immersion depth of:

190 mm

This relatively deep calibration well is one of the important advantages of the instrument.

The calibration well has a diameter of:

26 mm

The increased immersion depth allows temperature sensors with longer sensing elements to be inserted sufficiently far into the calibration block.

This is particularly useful for:

• Industrial resistance thermometers
• Thermocouples
• Liquid filled thermometers
• Mechanical temperature indicators
• Temperature switches

Adequate immersion depth helps reduce errors caused by heat conduction along the sensor stem.

The actual required immersion depth depends on the sensor design, sensing element length and required measurement uncertainty.

Interchangeable Calibration Inserts

The AMETEK CTC-650B uses interchangeable calibration inserts.

These allow temperature sensors with different diameters to be calibrated using the same instrument.

The manufacturer specifies the following insert dimensions:

Metric inserts are available for sensor diameters from 4 mm to 20 mm.

Imperial inserts are also available.

Undrilled inserts can be used for customized sensor configurations.

The appropriate insert should be selected according to the dimensions of the temperature sensor.

Good thermal contact between the sensor and insert helps minimize temperature differences.

Excessive clearance can increase measurement uncertainty.

For reliable performance, inserts should meet the manufacturer’s dimensional and material requirements.

Fast Heating Performance

The AMETEK CTC-650B provides efficient heating performance.

The manufacturer specifies a typical heating time of:

39 minutes from 23 °C to 650 °C

This allows the instrument to reach its maximum operating temperature within a relatively short time.

Fast heating is particularly useful when performing calibration procedures involving several temperature points.

Short heating times reduce waiting periods and improve calibration efficiency.

Actual heating performance depends on ambient conditions, sensor loading and the selected calibration insert.

Efficient Cooling Performance

The AMETEK CTC-650B also provides controlled cooling performance.

The manufacturer specifies a typical cooling time of:

65 minutes from 650 °C to 100 °C

This allows calibration procedures to be performed using both increasing and decreasing temperature sequences.

Cooling performance is particularly important when investigating temperature sensor hysteresis.

The actual cooling time depends on the operating conditions and thermal loading of the calibration block.

Typical Stabilization Time of 8 Minutes

The AMETEK CTC-650B features a typical stabilization time of:

8 minutes

This describes the time required for the calibration block to stabilize under the manufacturer’s specified conditions.

The instrument features an integrated stability indicator.

The display indicates when the selected temperature stability criteria have been reached.

The stability criteria can be adjusted according to the calibration requirements.

For demanding applications, the temperature stability of the complete calibration system should be verified using an appropriate reference thermometer.

The stabilization time of the device under test must also be considered.

MVI Technology for Improved Temperature Stability

The AMETEK CTC-650B features MVI technology.

MVI stands for:

Mains Power Variance Immunity

This technology helps maintain stable temperature control when the mains voltage fluctuates.

Industrial environments often contain electrical equipment that causes changes in the power supply.

Examples include large motors, heating systems and machinery.

Voltage fluctuations can influence the performance of

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