vacuum switch sample checks before approval
Agree what the sample must demonstrate, which media, temperature and enclosure lines count as acceptance, and how a later lot is compared with the approved item.
What a vacuum switch sample is for
A vacuum switch sample is a first article for sensing range near or below atmospheric pressure, port thread, contact action and enclosure. It is not proof that a later production lot will match unless those points are written as acceptance conditions. Devices working in vacuum or low absolute pressure use different diaphragms and different setting resolution from an air compressor pressure switch. Asking for the same compressor model but lower usually produces a part that cannot hold a repeatable setpoint at the bottom of its range.
Record the offered model number, the datasheet revision, the observed setpoint or vacuum range, the media the sample was tested on, the temperature limits stated on the file, and the enclosure rating you will require on production. Photograph the port markings and the nameplate. Keep that pack with the purchase file so a later batch can be compared without relying on memory. Read the inquiry options and the notes on procurement articles if the wording of vacuum versus pressure still needs a second pass.
Fix before sampling
- Exact model and rating, including vacuum or low-pressure range and contact configuration
- Media and temperature limits that will count as acceptance, not as a later surprise
- Accessories included in the sample, such as fittings, covers and mounting brackets
- Who pays sample cost and freight, written before the unit ships
- Enclosure rating with the system named, NEMA or IP, and the sealing method described
- How a later lot will be compared: model number, revision, recorded photographs and the same media
Discuss vacuum switch sample needs
Tell us the media, temperature limits and enclosure lines you will treat as acceptance. Quotes and samples still require supplier confirmation.