Dual-Zone: Active Control and Central Control
Reliable Temperature Source – Most Important
A good user interface and integrated solutions offer you time savings and easy handling of even difficult calibration jobs. But the quality of your temperature calibration measurements still depends on the quality of the temperature source.
The temperature block must be very stable and at the same time have good temperature homogeneity. This is very important because the sensors-under-test may have different measurement zones. As the sensor-under-test will also act as a thermal load in the block during the calibration, it is important that the block keeps the good homogeneity even with multiple numbers of probes and with large probes.
The new dual-zone design of the heating block is the most innovative step taken to solve the thermal problems mentioned above. Ametek has developed two different versions of the dual-zone principle – the ACTIVE-CONTROL and the CENTRAL-CONTROL versions. Both versions eliminate the need for insulation of the sensors-under-test and make it possible to calibrate liquid filled and other mechanical sensors.
State-of-the-art Well Design – Optimized for Accuracy
Dual-zone heating block: Active-control
The heating block is constructed in two zones, with SEPARATE active-control of each zone. The homogeneity in the lower part of the block is close to that of a laboratory liquid bath. The lower zone controls the calibration temperature.
The upper zone compensates for heat loss through the sensor-under-test and from the top of the block, and ensures a good homogeneity independent of the load. The active-control dual-zone heating blocks are used in the JOFRA ATC-Series.
Dual-zone heating block: Central-control
This type of heating block is constructed in two zones, with central-control of the zones. The main zone (lower zone) ensures optimum heat dissipation throughout the entire block.
The upper zone compensates for the heat loss from the top of the block and from the sensor-under-test, and is optimized to give a good homogeneity in the block. The central-control dual-zone heating blocks are used in the JOFRA temperature calibrators ITC 320 A and ITC 650 A.
Source by: Ametek