1130-1400°C

The process temperature control rings allow a subsequent accurate determination of the firing temperature prevailing in the kiln taking into account the temperature effect over time.
They can be placed in the kiln directly on the firing batt so that the temperature distribution in the kiln can be conveniently determined.
The measurement is carried out by means of the shrinkage of the ring which is precisely determined by means of a digital slider (measuring accuracy 0.01 mm).

Package:  3 psc and 15 pcs

Using a Temperature Ring and Measuring Device (Micrometer or Digital Caliper)

A temperature ring and a measuring device (micrometer or digital caliper) can be used to determine the effective firing temperature inside the kiln at the exact spot where the ring was placed. We recommend performing this check every third to fifth firing, or anytime you suspect your thermocouple readings might have changed.

Instructions for Use:

1. Press the red “Off/On” button. The display will turn on (see Fig. 1).

2. The display should read 0.00, assuming the measuring surfaces are fully closed. If not, use the yellow “Zero” button to reset.

3. Secure the object to be measured. When measuring the size of the temperature ring, place it on a flat surface. Make sure the ring is clamped evenly and securely.

4. The measurement will appear on the display (see Fig. 2).

5. Use the provided reference chart (Fig. 3) to determine the firing temperature based on the measured size. This chart comes with the ring.

 **Please note: The micrometer is not included with the rings and must be purchased separately.**

Interpreting the Measurement Results:

PTCR rings are used to verify the consistency of thermal conditions in the kiln and the repeatability of the total thermal energy received during firing. These rings shrink (contract) over a broad temperature range. After firing, their final size reflects the conditions at peak firing temperature. Unlike cones, the thermal work absorbed by the ring can be expressed numerically—as an effective temperature.

Just like with cones (pyrometric devices), the expected shrinkage of the ring indicates the expected level of thermal work completed under a given firing schedule. It’s important to note that changes in the firing profile can lead to differences in thermal intensity—i.e., the effective temperature—even if the peak temperature remains the same.

Rings can be placed in different areas of the kiln to assess temperature uniformity. The temperature differences can be directly measured in degrees.

The size-to-temperature correspondence is determined by the manufacturer under the following conditions:

• Firing atmosphere: air

• Heating rate: 2°C per minute

• Hold time at final temperature: 60 minutes