An environmental noise consulting company had invested significantly in multi-channel signal conditioning infrastructure over a period of years. Their measurement microphone capsules were aging — some were more than 10 years old — and their calibration records showed sensitivity drift approaching the Class 1 tolerance limits. However, replacing the complete measurement infrastructure was not economically justified. What was needed was a compatible capsule replacement that could restore calibration traceability without requiring new preamplifiers, cables, or data acquisition hardware.
The key compatibility requirement was a precise match between the replacement capsule's thread type, internal spring-loaded pin contact, and nominal sensitivity with the existing preamplifier housings. Minor sensitivity differences would have required all existing calibration documentation to be re-evaluated. PLACID's ability to supply capsules to a specific sensitivity tolerance, with TEDS identification pre-programmed to match the original microphone series, resolved the compatibility challenge.
The consultancy now operates a multi-site monitoring network with PLACID Class 1 capsules and ISO/IEC 17025 accredited calibration documentation, without the capital cost of full instrument replacement.