A perovskite line is unforgiving at handover. It is not one machine but a chain — coating, drying, transfer, encapsulation, sometimes laser processing and sputtering — running inside a controlled atmosphere, with a process window that the equipment was specified around. Buying the equipment and accepting the equipment are two different events, and too many projects discover the difference at the point where the balance is due and the line will not hold its process.
An acceptance plan is the document that closes that gap. Written before the purchase order, it states what has to be demonstrated, on what material, by whom, and what happens when a test does not pass. The sections below are the ones that carry weight in a real handover dispute.
1. Fix the scope and the interface list first
Most acceptance arguments start as scope arguments. Attach to the plan a single list that both sides sign:
- Every machine in the line, by model designation as it will appear on the nameplate and the specification sheet, plus options and spare parts.
- Utilities and services for each machine: power, compressed air, vacuum, exhaust and purge gas, chilled or process water, drainage, and the connection points and their capacities.
- Room and building conditions the vendor may reasonably be expected to rely on: enclosure class, glove-box or dry-room atmosphere, temperature and humidity limits, floor loading, access route and door sizes.
- Consumables and materials that are supplied versus supplied by you, including the substrate and process materials used for acceptance itself.
A line accepted in a factory that does not match your hall is not the line you will run. State clearly which environment each test is performed in, and what is re-tested after installation at your site.
2. Split the acceptance into stages with their own exit criteria
A single "acceptance test" invites a single argument. Structure it:
- Design and documentation review: drawings, process and safety concept, bill of materials for critical components, control system architecture, and the specification each machine is built against.
- Works test before shipment: each machine run under load in the vendor's facility, witnessed, with the results recorded. This is where alignment, coating uniformity, temperature control and transfer behaviour are cheapest to fix.
- Installation and commissioning: unpacking and damage checks, levelling, connection to the listed utilities, interlock and safety verification, calibration records, and software versions recorded at handover.
- Operational qualification at your site: the line running your process, on your substrate, in your atmosphere, for a stated continuous period.
- Reliability and throughput demonstration: the line run for an agreed duration at the agreed rate, with stoppages logged and reasons recorded.
Payment milestones and rectification periods should map to these stages in the contract, otherwise the plan has no teeth.
3. Specify measurable tests, including how each is measured
For each requirement in the specification, write one test, one method and one pass rule. A published equipment page is a starting point, not an acceptance criterion — for example the perovskite production line equipment listing describes equipment for research and production in perovskite solar, OLED, lithium battery, quantum-dot LED and OPV fields, and it is your plan that turns that into a measurable test on your process.
- Process capability: coating or lamination uniformity, thickness or bond quality across the substrate, and the repeat count, with the measurement instrument and its calibration stated.
- Alignment and placement: fitting tolerance and the number of parts tested, measured by an agreed method rather than by eye.
- Atmosphere control: the water and oxygen levels the process depends on, how and where they are measured, and how long the enclosure holds them.
- Temperature and pressure control: setpoints, stability and uniformity over the working area, recorded during the run.
- Throughput: cycle time or parts per minute, measured over a continuous window, not a best-case demonstration.
- Availability: the agreed observation period, the definition of a stoppage, and who classifies the cause.
Any figure carried into the plan must be tied to the exact model designation on the vendor's specification sheet. Naming across a product range is not always consistent, and a number quoted in a discussion belongs to no machine unless it is attached to a model name and variant.
4. Cover safety, documentation and training as acceptance items
These items are routinely left to the end and then used as excuses:
- Safety: guarding, interlocks, emergency stops, pressure and vacuum systems, laser or UV sources, hot surfaces, gas and solvent handling, and the vendor's hazard documentation for the machine as delivered.
- Documentation: as-built drawings, electrical and pneumatic diagrams, spare-parts list with part numbers, calibration certificates, software and recipe documentation, and the language your operators will actually use.
- Training: named attendees, the practical tasks each person must be able to perform, and a competency record rather than an attendance sheet.
- Service and support: response terms, consumable and wear-part life, remote access arrangements and the escalation route.
Compliance with the regulations, permits and workplace safety requirements that apply at your site remains your responsibility as the operator; a vendor's declaration for the machine does not cover your installation, your process chemicals or your local rules.
5. Decide what happens when a test fails
Write the failure path in before the first test is run, because that is the only moment it is negotiable:
- Who records the failure, and in what form — photograph, log extract, measurement file.
- The re-test rule: what is corrected, what is re-run, how many attempts, and within what period.
- What counts as a conditional acceptance, what must be closed before it converts to full acceptance, and by when.
- The retention or milestone consequence of an unresolved failure, and who signs the acceptance document.
Keep one file for the whole handover: the signed scope, the test results with dates and operators, the punch list, and the final acceptance signature. It is that file, not the purchase order, that settles what was delivered.
Shenzhen PowerDe Automation Precision Equipment Co., Ltd. develops and manufactures thin-film solar equipment, including coating, bonding and production-line systems, and supports customised configurations and integrated engineering work. If your acceptance plan depends on a particular process step, atmosphere, substrate or throughput target, tell us the process window, the line layout and the tests you intend to run, and we will confirm which equipment and configuration match the specification you need to accept against.
