Define the measurement task
Explain what the measurement will be used for, such as monitoring a pressure difference across equipment. Provide the required differential range, units and operating conditions on both sides of the measurement.
If a range has not been established, describe the process and ask for a technical review. Keep unknown values clearly marked instead of filling them with assumed figures.
Describe the process and installation
List the process medium, temperature, normal line pressure and any cleaning or environmental conditions that may affect the proposed assembly. Include the connection arrangement and a drawing of the available installation space.
Ask the supplier to identify any proposed accessories or installation components separately. Confirm who is responsible for reviewing the complete measurement installation.
Make competing quotations comparable
Request the exact model and configuration, measuring range, output, power requirements, connection and material specification. List the required drawings and test or calibration documents in the inquiry.
Separate the instrument price from accessories, documentation and other services. Confirm delivery assumptions and the approval steps required before manufacture or shipment.