Ezy-Cal
Current AP content describes a ready-to-use count-control suspension around 2,000 particles/mL at selected sizes.
Objective
Count controls answer a routine performance question
A count-precision standard is designed to help verify that a liquid particle counter produces repeatable count results under a defined sample procedure. It is not automatically a full size-calibration standard.
Count-Cal
Current AP portfolio includes count-precision products intended to reduce serial dilution and support routine liquid-particle-counter checks.
Procedure design
Concentration, sample volume and statistics must align
| Input | Why it matters |
|---|---|
| Particles per mL | Defines the expected population presented to the counter |
| Sample volume | Determines the expected total count and statistical precision |
| Replicates | Separates random variation from drift or preparation error |
| Background blank | Establishes contamination contribution |
| Acceptance limits | Define how the instrument is judged |
| Mixing and hold time | Maintain representative concentration during sampling |
Size control vs count control
Know what the certificate supports
A count-control product may include a reference size, but the primary procedure may be designed around concentration and repeatability. A size-calibration procedure may require a different uncertainty, distribution or concentration architecture.
Decision rule: use the certificate field the procedure depends upon. Do not infer a broader calibration claim.
Applied Physics pathway
Confirm the exact count-control family
- Target particle size.
- Expected particles per mL.
- Instrument model and sample volume.
- Routine check frequency.
- Acceptance criteria and record format.
- Bottle quantity, storage and expiration.
Applied Physics technical pathway
Match the standard to the measurement—not the other way around.
Send the instrument, medium, target size, concentration, certificate and packaging requirements to Applied Physics for a technical recommendation.