Keep a bath or formulation change linked to the calibration, reference tests and decision to return the concentration signal to use.
A chemical concentration analyser can still produce a plausible value after a formulation change. The important question is whether that value remains valid for the material now passing the sensor. This PMA application sets out a changeover record for chemical baths and recirculating solutions.
Rhosonics describes the 8500 as measuring one chemical concentration using sound velocity and temperature. The 9500 combines those measurements with conductivity for two chemical concentrations. Neither description establishes suitability for every new mixture, contaminant or operating range.
Use the record when the recipe, supplier formulation, bath condition or cleaning sequence changes. Identify the current approved configuration before the change, then define what evidence is needed before the reading is used for replenishment or another operating decision.
Keep the previous configuration and reference results available. A changed target is not the same as a confirmed measurement model.
Identify the old and new formulation, relevant chemical components and their expected ranges. Record changes in impurities, dissolved products or additives as well as the named chemical.
For a replenishment change, distinguish a different concentration of the same supported formulation from a different composition. Send the actual formulation for review when that distinction is uncertain.
Record the analyser model, sensor arrangement, calibration identifier and output units. Keep a dated copy of the settings and any accepted reference evidence from the previous duty.
Name the authorised configuration for the new solution. Do not assume that switching between 8500 and 9500, or changing a displayed label, supplies a suitable calibration.
Record draining, rinsing, cleaning and refill stages with their start and finish times. Mark the point at which representative new solution reaches the measurement and sampling locations.
Keep mixed or transitional material separate from the accepted operating state. Agree how the concentration signal will be flagged while its applicability is being checked.
Collect representative references using the agreed chemical analysis method. Identify the components and reporting units that each test actually determines.
Compare the new solution through the intended range and temperature conditions. A single passing result at one concentration does not demonstrate performance over the whole new duty.
Keep the measurement acceptance separate from the chemical process and its existing operating protections. The responsible team decides when the evidence is sufficient.
Record the comparison limits, tested conditions and any untested boundary. Confirm materials, temperature and installation requirements for the new duty as well as the calibration before accepting the configuration.
Name who approved the change, which configuration is now active and when the next reference check is due. State what formulation change or unexplained disagreement would trigger another review.
Send the old and new solution descriptions, model and calibration identifiers, concentration and temperature ranges, transition timeline and reference results. PMA can review whether the proposed configuration supports the changed duty.
This changeover record adds configuration and acceptance evidence to the broader chemical application library. It does not replace the specific chemical compatibility and calibration review.
Compare the PMA 8500 and 9500 pages against the number of independently changing chemical concentrations in the supported solution.
Use the specialist chemical library for individual duties and the current manufacturer model descriptions for the measurement boundary.
Speak to the PMA team about your instruments, reagents or service requirements. Tell us what you need, and we’ll help you find the right next step.
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