differential pressure switch quotation alignment
Requirements, factory inquiries and quote comparison for devices that switch on a pressure difference across two process connections.
What to gather before sending a differential pressure switch request
A differential pressure switch is specified by the two pressures it compares, not by a single tank setpoint. Before we approach factories, collect the high-side and low-side ranges, the switching differential you will accept, media on each port, process connection size and thread, contact rating with voltage AC or DC plus phase and frequency, enclosure type, quantity with unit and destination. If you only have a single-port compressor or well device in mind, say so; that is a different form and should not be quoted as a two-port differential item. We restated those lines so each factory prices the same object. Browse inquiry options when you need to name the neighbouring forms, or application conditions when the site is a well pump rather than a process filter.
| Task | Our role | Your role |
|---|---|---|
| Specification | Restate port size, thread, process connection, ranges and contact rating as questions | Approve the final written spec, including media and enclosure |
| Supplier selection | Shortlist factories that publish this two-port form and compare answers on one basis | Choose the supplier after the differences are visible |
| Quality checks | Coordinate agreed sample or first-article checks | Accept or reject against the written acceptance lines |
| Compliance | Collect datasheets and listing status for the exact model offered | Confirm destination approval, installation and commissioning |
Questions each supplier should answer about port size, thread and process connection
When the exact differential pressure switch is unavailable, we do not silently substitute a single-port well or compressor switch. An equivalent has to be declared as an equivalent: same high and low ranges, same process connections, same contact rating and a written note of what changed. If those lines cannot be matched, we return a no-bid rather than a cheaper adjacent product.
1 Requirement
We restate your two-port duty, media and electrical rating in writing. You confirm or correct that sheet before it leaves this desk.
2 Supplier search
We identify factories that publish differential pressure switches for that duty, not a neighbouring single-port form.
3 Quote comparison
We line up offers on one basis: connections, setpoints, contacts, enclosure, quantity unit and freight.
4 Order follow-up
We track agreed checks before shipment. You still accept the commercial terms and the destination paperwork.
Send a differential pressure switch brief
Include the two pressure ranges, process connections, quantity, destination and contact rating so each factory answers the same sheet.