Test and Calibration

NIST Standard Calibration

The manufacturer provides comparison temperature calibrations from -25 to +250 °C (-13 to 482 °F) using liquid baths and an extended range using heat furnaces and single point
set-ups on the International Temperature Scale of 1990.
Calibrations are traceable to standards maintained by the National Institute of Standards and Technology (NIST). Calibration services are in conformance with ASTM E220, IEC 17025 and ANSI/NCSL Z540-1-1994. The report of calibration is referenced on the serial number of the temperature assembly.

Three point calibrations are provided, given that the specified temperatures are within the recommended range and the minimum length requirements are met as specified. The minimum length is based on the overall length "X" of the spring loaded insert.

-25 to +250 °C can be ordered using the calibration option in the sensor structure - extended range must be ordered separately as a service.

Inspection certificate 10204 - 3.1
The inspection certificate EN10204 3.1 for medium contact parts is produced by a department independent of the production and confirmed by an expert independent of the production of the manufacturer ("works expert").
The material tests carried out and the additional quality control agreed on are certified with detail of the test results and under supervision of an independent authority.
 

NACE
The NACE MR0175 standard is essentially a listing of materials that are considered suitable for use in surroundings containing sulfur hydrogen (sour gas).
New suitable materials are included in this standard after passing through an extensive approval process (annual update).
 

PMI (non destructive testing)
This non destrucitve material identification as well as check of welding connections are frequently used at acceptance tests.
 

Assessment according to the pressure equipment directives
If the multi-point thermometer is equipped with a safety chamber, this chamber represents a pressure containment equipment. This is because in the case of a fault condition (e.g. thermowell rupture) this piece of equipment is filled with process pressure. Depending on the type of fluid, the volume of the chamber and the process pressure the correspoding conformity assessment module is consulted and used.
 

X-ray testing (non destructive test)
Faults like inclusions, pores, tears etc. in the base material and/or in the welded seam are seen.
Furthermore the exact positioning of the welded components can be checked.
 

Die penetration test
Red-white-method
Suitable for checking material surfaces and welded seam surfaces. So for example cracks can be detected.
It is applicable for the welding seams of stainless steels, austentic materials and metal based alloys.

Hydrostatic pressure test internal/external
Using the internal and external pressure test the strength an pressure tightness of thermowells and process connections can be checked. For example the internal pressure test serves for checking the safety chamber connection flanges.
 

Helium leakage test
Pressure tightness test for thermowells, welded seams, screwed fittings. Depending on the thermometer design and thermometer size it can be pressurized internally or externally with helium gas.