Sourcing automatic pH controllers from China
Automatic pH controllers from China provisionally fall under the other-controller line at 2% duty; related apparatus spans 0% to 2%. For electronic models sold in Great Britain, confirm the applicable electromagnetic compatibility conformity assessment before sale. Cambridge China Bridge sources automatic pH controllers.
Duty on pH controllers and related apparatus
Read from the UK Trade Tariff on 18 October 2026, heading 9032 covers automatic regulating or controlling instruments and apparatus. For a separate electronic pH controller that measures acidity and adjusts dosing towards a set point, start classification checks with 9032 89 00 90. The other table rows cover separately imported supporting apparatus and parts, rather than alternative codes for the same controller.
The other-controller and parts lines carry 2% duty for goods from China, with no anti-dumping or countervailing measures and no suspension recorded. Hydraulic or pneumatic apparatus carries 0%. The listed digital valve controller line has a 0.00 % autonomous suspension against its ordinary 2% rate, with a footnote excluding mixtures, preparations or products made up of different components containing these products. Do not assume a complete pH dosing assembly qualifies.
The UK Trade Tariff attaches an import control of fluorinated greenhouse gases to these lines. Government guidance requires imported fluorinated-gas equipment to be labelled, including correct labelling of empty equipment. Establish whether the shipment contains such equipment and ask your customs broker to confirm the control and declaration requirement. Confirm the commodity code using the actual assembly and function; see PID temperature controllers for the wider controller heading.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Other automatic controllers, including pH controllers subject to classification | 9032 89 00 90 | 2% | None |
| Parts and accessories of automatic controlling apparatus | 9032 90 00 90 | 2% | None |
| Digital valve controllers for liquids and gases, imported separately | 9032 89 00 40 | 2% | None |
| Hydraulic or pneumatic regulating apparatus, imported separately | 9032 81 00 00 | 0% | None |
Specify the probe and dosing behaviour
Specify the liquid, operating temperature, probe materials, mounting connection and cable arrangement. Agree measurement range, accuracy, calibration method and temperature compensation with the factory. State whether the order includes the electrode, reference junction, temperature sensor, probe holder and dosing pump, or only the controller.
Describe the dosing direction, pump interface, output load, dead band, alarm behaviour and response to a disconnected probe. Agree how dosing stops during loss of flow, an implausible reading or a power interruption. Test the proposed controller with the actual probe and pump before approving the sample.
For electronic models within the electromagnetic compatibility rules, the importer must check the manufacturer's conformity assessment and provide importer identification and a postal address on the equipment, or elsewhere where permitted. For mains-powered models, confirm applicable electrical safety requirements with the relevant authority and request supporting evidence. For equipment within hazardous-substance restrictions, manufacturers, importers and distributors are responsible for compliance. Match the evidence to the supplied model through testing and certification.
Worked duty example
Illustrative example, not a quote: Illustrative order of 50 automatic pH controllers with matching probes under 9032 89 00 90, invoiced at £10,000 free on board, with £900 of freight and insurance to the UK. The customs value is £10,900. Duty at 2% is £218. Import VAT at 20% is charged on the customs value plus duty, £11,118, so it is £2,223.60. Import taxes total £2,441.60; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £218 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Measurement: check readings in fresh reference buffers across the agreed operating range, then check repeatability after rinsing and temperature changes. Record results against the approved accuracy specification.
Dosing: check the output changes in the correct direction, operates the intended pump and stops under the agreed fault conditions. Verify alarms, settings retention and restart behaviour.
Probe and enclosure: check glass tips, storage caps, storage liquid, connectors, cable seals and terminal security on arrival. Compare supplied probe materials and mounting fittings with the approved sample.
Documents: check model identity, ratings, wiring instructions and importer details against the compliance file. Retain the calibration and functional records from quality inspection.
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What goes wrong
A controller may display a stable reading while its probe drifts, dries out or responds too slowly in the intended liquid. Temperature compensation can be configured for the wrong sensor, and electrically noisy pump wiring can disturb the measurement. Test the assembled system while the pump operates.
Reversed dosing logic, unsuitable relay loads or an uncontrolled restart can cause excessive chemical addition. Specify fault behaviour in writing and demonstrate it on the approved sample. Keep replacement probe compatibility and recalibration instructions with the installation records.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.
Frequently asked questions
What is the UK import duty on automatic pH controllers from China?
The other automatic-controller line, 9032 89 00 90, carries 2% duty from China, with no trade remedy or suspension recorded. Confirm that line against the actual product.
Is a pH meter the same as an automatic pH controller?
A meter measures acidity. An automatic controller also adjusts an output towards a set point. Ask the supplier to demonstrate the control function and describe exactly what the shipment includes.
Can I use my existing probe and dosing pump?
Only after checking the probe input, temperature sensor, connectors and pump interface. Test the complete arrangement, including alarms and probe-disconnection behaviour, before approving it.
What compliance evidence should I request?
For models in scope, check electromagnetic compatibility conformity assessment and hazardous-substance compliance. Match documents to the supplied model.