Start with the model and measuring method
Identify the meter and sensor or sample-cell arrangement. Say whether the instrument is a portable unit, a bench instrument or an online installation. Include the units displayed, the measurement method stated in the manual and the interval normally used in your reports.
Turbidity instruments can differ in their light source and detection arrangement. Similar-looking readings from different methods should not be treated as interchangeable without checking the method requirement. Send the relevant part of your test procedure if the purchasing description is simply “turbidity calibration”.
Bring the routine checks into the enquiry
List the check standards and values used by your laboratory, their expiry dates and any recent readings that prompted the request. Record whether the instrument gives a stable offset, fluctuates or disagrees only with one cell. Tell us about scratched cells or a changed sensor assembly before a service visit is planned.
RTS will review the model, specified points and suitable reference materials before confirming the work. Agree how the initial and final results should be recorded if an adjustment is requested. A calibration result for the instrument does not determine whether the water sample meets a product or discharge specification.
Plan access to a laboratory or online meter
Identify who can release the bench unit and whether a backup is available for routine sample testing. An online meter enquiry should include access, sensor mounting and the plant’s arrangements for taking the point out of service.
From any Indian location, send the instrument list and required reporting method before arranging transport. Ask which cells, accessories and documents should accompany the meter so that the agreed work can be carried out on the correct configuration.