Introduction to ASTM E644
Within the bounds of repeatability, ASTM E644 offers uniform procedures for testing industrial resistance thermometers, allowing a tester to anticipate receiving the same value of a test result from repeatable measurements made on the same test product. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM E644 tests for our clients. The ASTM E644 standard can be used to assess the suitability of platinum resistance thermometers for use in a given application to comply with a specific specification, to compare the relative benefits of similar test articles provided by multiple manufacturers, or to establish the parameters of a specific thermometer design’s application.
ASTM E644 Test Method
The ASTM E644 Test Method includes the following major tests;
| Insulation Resistance Test | The thermometer is mounted and insulation resistance measurements are taken after applying voltage. |
| Thermometer Calibration | Both the fixed-point approach and the comparison method, or both, can be used to calibrate a resistance thermometer. |
| Minimum Immersion Length Test | Both the test bath’s temperature stability and the measuring equipment’s sensitivity need to match the given temperature measurement uncertainty. The goal of this test is to be non-destructive. |
ASTM E644 Test Specimens
| Specimen Detail | The equipment, techniques, and principles involved in calibrating and testing industrial resistance thermometers are covered by ASTM E644 |
| Specimen Size | Only thermometers with immersion lengths of less than 51 mm (2 in) are suitable for this test. |
ASTM E644 Test Result
To sum up, ASTM E644 covers a wide range of analyses that are essential for determining the effectiveness and dependability of temperature sensors and associated equipment. These tests address several topics, such as humidity tolerance, thermoelectric behavior, immersion behavior, pressure and vibration effects, insulation resistance, calibration accuracy, thermal response characteristics, mechanical shock resistance, stability, and end seal integrity.
Tests Related to ASTM E644ASTM E644 is related to tests including ASTM E1 for liquid in glass type thermometers, ASTM E77 for thermometer inspection, and ASTM E344 for thermometry-related terms.
