TS–006 When is a full verification test required for weighing and measuring instruments
This policy is to clarify when a weighing or measuring instrument in use for trade requires a full verification test to be completed.
Where the Mark of Verification (MOV) or sealing has been broken for the purposes of accessing an instruments calibration settings, or to alter any metrological characteristic, the instrument must be verified by performing a full verification test.
This includes, but is not limited to, replacing any of the following components that can affect the metrological characteristics of the instrument:
- Load cells,
- Junction boxes,
- PEC board in the indicator, or the complete indicator
- Flow meters and indicating device, and
- Any calibration action that causes an instruments event-counter to increment up.
This also includes but is not limited to altering any of the following calibration functions;
- Span adjustment
- Zero adjustment
- Meter alteration or a K factor adjustment
There can be instances where an instrument has the MOV removed or sealing broken to gain access to the instruments interface and upgrade the non-legally relevant software or replace hardwired auxiliary devices, e.g. a printer or secondary indicator that has no effect on the metrological characteristics of an instrument.
This activity is permitted if:
- The MOV or sealing is removed by the Accredited Person (AP) individual or organisation that applied it
- The action and date is recorded on the original test sheet for the instrument
- Any existing Certificate of Accuracy is not altered or removed.
The AP reapplying the MOV must be accredited for that particular category of instrument.
Any other instance requires the prior written approval from Trading Standards or a full verification test to be performed.
Trade Measurement — Technical Policy
|Policy number:||TS - 006|
|Effective date:||July 2016|
|Policy name:||When is a full verification test required for weighing and measuring instruments|
|Reviewed by:||Davis White, Legal Metrology Advisor and Senior Trading Standards Officer|
|Approved by:||Phil Sorrell, Team Leader Compliance and Inspection|