The AMETEK PTC-425 is a professional dry block temperature calibrator designed for accurate, reliable and efficient temperature sensor calibration in industrial environments, calibration laboratories and field service applications.
With a temperature range from 33 °C to 425 °C, excellent temperature stability of ±0.02 °C and an accuracy of ±0.13 °C when using the specified external reference sensor, the AMETEK PTC-425 provides outstanding performance for demanding temperature calibration applications.
The instrument combines patented heating technology with active dual-zone temperature control to ensure fast temperature changes, excellent temperature homogeneity and reliable calibration conditions.
With a heating time of approximately 10 minutes from 33 °C to 425 °C, the AMETEK PTC-425 significantly reduces waiting times during multi-point calibration procedures.
The calibrator is particularly suitable for calibrating resistance temperature detectors (RTDs), Pt100 sensors, thermocouples, temperature transmitters and temperature switches.
Its portable design, interchangeable calibration inserts, color display and USB communication interface make it suitable for both laboratory and field calibration.
The AMETEK PTC-425 is especially useful in pharmaceutical manufacturing, food processing and medical applications where precise temperature monitoring is essential.
Depending on the selected configuration, the instrument also supports external reference thermometer measurement, sensor-under-test measurement and automated calibration functions.
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Your Benefits at a Glance
The AMETEK PTC-425 combines high temperature accuracy with efficient operation and flexible measurement capabilities.
Its main advantages include:
- Temperature range from 33 °C to 425 °C
- Internal reference accuracy of ±0.20 °C up to 350 °C
- Internal reference accuracy of ±0.25 °C above 350 °C
- Accuracy of ±0.13 °C with the specified external reference sensor
- Excellent temperature stability of ±0.02 °C
- Radial temperature homogeneity of 0.02 °C
- Patented heating technology
- Active dual-zone temperature control
- Heating from 33 °C to 425 °C in approximately 10 minutes
- Cooling from 425 °C to 100 °C in approximately 25 minutes
- Interchangeable calibration inserts
- Immersion depth of 150 mm
- USB communication interface
- Automatic temperature stepping
- Optional reference thermometer input
- Optional sensor-under-test measurement
- Optional temperature switch testing
- Compatible with JofraCal calibration software
- Three configurations: PTC-425A, PTC-425B and PTC-425C
- Portable construction weighing approximately 9.2 kg
Temperature Range from 33 °C to 425 °C
The AMETEK PTC-425 provides a temperature calibration range of:
33 °C to 425 °C
This temperature range covers numerous industrial and laboratory applications requiring accurate temperature measurements at elevated temperatures.
Typical calibration temperatures include:
- 50 °C
- 100 °C
- 150 °C
- 200 °C
- 250 °C
- 300 °C
- 350 °C
- 400 °C
- 425 °C
The temperature range is specified at an ambient temperature of 23 °C.
The AMETEK PTC-425 is particularly suitable for calibrating temperature sensors used in industrial heating systems, pharmaceutical production, food processing and thermal validation procedures.
Its maximum temperature of 425 °C makes the instrument especially useful for applications requiring higher calibration temperatures than conventional medium-temperature dry block calibrators.
High Temperature Accuracy
The AMETEK PTC-425 provides different accuracy specifications depending on the reference thermometer configuration.
Accuracy with Internal Reference
When using the internal reference thermometer, the manufacturer specifies:
| Temperature Range | Accuracy |
|---|---|
| 33 °C to 350 °C | ±0.20 °C |
| Above 350 °C to 425 °C | ±0.25 °C |
These specifications describe the accuracy of the internal temperature reference under defined operating conditions.
Accuracy with External Reference
When using the specified external STS-150 reference sensor, the manufacturer specifies:
±0.13 °C
This specification applies to the PTC-425B and PTC-425C configurations.
The external reference thermometer measures the temperature directly within the calibration insert.
This allows more accurate comparison calibrations than relying exclusively on the internal temperature indication.
The manufacturer’s accuracy specifications apply over a 12-month period under defined conditions.
They must not be confused with the expanded measurement uncertainty stated on an individual calibration certificate.
Excellent Temperature Stability of ±0.02 °C
The AMETEK PTC-425 provides excellent temperature stability.
The manufacturer specifies:
±0.02 °C
Temperature stability describes the variation of the calibration block temperature over time under defined operating conditions.
The manufacturer evaluates stability after the stability indicator has been active for 10 minutes, followed by a 30-minute measurement period.
Excellent temperature stability is particularly important when calibrating precision resistance thermometers and industrial temperature sensors.
Stable temperature conditions help minimize measurement variations during comparison measurements.
Active Dual-Zone Temperature Control
The AMETEK PTC-425 features active dual-zone temperature control.
This technology uses two independently controlled heating zones.
The lower zone provides precise temperature control in the calibration area.
The upper zone compensates for heat losses caused by the open top of the calibration block and the inserted temperature sensors.
This design improves temperature homogeneity and reduces axial temperature gradients.
It is particularly useful when calibrating temperature sensors with different dimensions, immersion
