A New Solution…to Calibrate Short Sensors at High Temperatures

The Pegasus range offers extreme high temperature calibration in an easy to use portable package – ideal for the calibration of high temperature thermocouples. It has been designed for fast heating and finds applications in the glass, electrical power, automotive and material processing industries.

The Pegasus-T is the latest member of the Pegasus family developed for sensors that are simply too short to be calibrated in the Pegasus 4853 or other conventional calibration furnaces.

The advanced control system allows the user to select optimal performance for sensors immersed at 25mm, 35mm or 50mm with three independent control loops. It also has built in over-temperature protection to protect the heater wire from over temperature thus increasing life expectancy.

Immersion Depth

Calibration engineers understand that to get the best accuracy temperature sensors should be immersed deeply into a calibration bath or furnace and compared to a reference thermometer.

Calibrate Short Sensors

But how to calibrate very short sensors such as those used in the automotive industry? These sensors are too short to go into conventional furnaces. The Isotech Pegasus Model 4853 has an immersion depth of 130mm which will suit many sensors but what if the sensor is very short, 25mm to 50mm? Large furnaces are unsuitable and calibrating these types of device provides a significant measurement challenge.

Dynamic Heating Zone

The new Pegasus-T has been developed for this very challenge and features a dynamic heating zone for short immersion probes providing a calibration source for sensors that are too short for other furnaces. It is being trialled and adopted at a number of customer sites in Europe and Asia and is now released for general sale.

Pegasus-T allows you to choose an internal control sensor at the same depth the sensors under test, selecting from three internal noble metal control sensors or using an external control sensor placed at the same depth as the sensor under test.

1: Dynamic Heating Zone

Choose one of three internal thermocouples to optimize performance for different length sensors.

2: Control From External Sensor

Switch from the internal control sensor to an external Type R thermocouple that can be placed alongside the test sensor.

3: Independent Reference Channel

Type R thermocouple input, can be used for external control or with a reference probe for an independent temperature measuring loop, option for UKAS calibration.

Cautionary Note
The operating life of the heater will vary with both the maximum operating temperature and the duty cycle. Units being used 24/7 at high temperatures may require a maintenance schedule for heater replacement

Accuracy

With short immersion probes there can be large errors as the sensor cannot be immersed deeply enough to allow it to reach the same temperature as the calibration block and there is a temperature gradient at the edge of the block. Tests show that the Pegasus-T is more useful than alternatives but there will always be a need to experiment and evaluate to determine the uncertainty for the conditions of use. It can be helpful to use a reference sensor of the same type as the units under test. Special Inserts We can design and manufacture inserts to suit your sensors…

Calibration Blocks

The Pegasus-T is supplied without an insert as most applications will require drilling to suit your requirement. Our CAD Designers can produce designs for your approval before manufacture in our workshop. Alternatively, we can provide blank inserts for you to manufacture or a pre-drilled insert with 6 x 5mm pockets, 100mm Deep.

Advanced Features

Fully featured high resolution display with advanced control features including multi loop control with autotune, adjustable temperature alarms with control from internal or external thermocouples

• Temperature Programmer
  Create, Edit and Store automatic programs for temperature stepping
• Reference Channel Input
  Can be used for external control or as a reference input. A Type R Thermocouple, Model 935-14-91 is included with each Pegasus-T
• Ethernet Interface
  Free Software, I-Cal Easy Log – web download
• Offset Elimination
  Connect the external reference probe and the calibrator can trim the block temperature to remove offsets
• USB Port
  Export logged data to a USB Key, controller data is continuously logged