Identify the working assembly
Send the manufacturer, model and serial numbers of the base, piston-cylinder assembly and mass set. Include the last certificate if available and identify replacement or missing weights. State whether the unit operates with gas or liquid, its working pressure interval and whether the required result is gauge or absolute pressure.
A photograph of the assembled instrument can help resolve an equipment list that only says “DWT”. Please also identify any different piston assembly used for another range; it should not disappear into a single asset description.
Agree what the result needs to cover
A balance generates pressure from force acting on a piston of known effective area. Its reference conditions matter to the result. Provide the location where it is used, the manufacturer’s calculation sheet or software details and the conditions stated on the previous certificate. RTS will review the assembly, reference requirement and available method before confirming acceptance.
Calibration of a mass set on its own does not describe the complete pressure balance. Tell us whether the request concerns the complete system, the piston-cylinder assembly or particular masses, and how your workshop uses the certificate.
Plan the workshop handover
Report poor piston rotation, unusual pressure decay or contamination with the enquiry. Those observations may require a condition assessment before a calibration booking. Ask for packing and fluid-handling requirements before dispatch; keep identified mass sets together.
Give the dates when the reference can leave service and whether a spare is available. Include the dispatch city and the address to which the complete set must return. Check that each piston assembly and mass set has its own identity on the packing list.