A temperature sensor may be an RTD, thermocouple, thermistor, digital or infrared device, or merely a probe/element. Misidentifying the product can lead to the wrong HS, origin rule and Korean conformity route.

This guide follows market scan → model classification → HS/tax/VAT → VKFTA/RCEP → RRA/KC → documents → E2E timeline → post-shipment.

Updated: 28 Aug 2026 · Scope: exports from Vietnam, with South Korea as the primary market.

1. QUICK OVERVIEW

MARKET

South Korea is the primary market; the U.S., China and EU are comparison markets. HS 902519 data are used only as a trade proxy.

VIETNAM EXPORT POLICY

Screen the exact model, function, wireless/encryption, power/battery and end-use before concluding the export-control route.

REFERENCE HS

9025.19.19 is a reference for certain electrically operated temperature-measuring devices; not a universal code for probes/elements.

ORIGIN / FTA

For Korea, compare VKFTA and RCEP; confirm the PSR only after final HS classification.

KOREA COMPLIANCE

Screen RRA/KC by exact equipment category; wireless models require additional radio review.

OPERATIONS

Lock model/spec → conformity route → origin → packing → customs → cut-offs → post-shipment.

Glossary: Market Access; PSR (Product Specific Rule); RRA (National Radio Research Agency); Cargo Ready Date; ETD (Estimated Time of Departure).

2. PRODUCT SCOPE & DETAILED CLASSIFICATION

“Temperature sensor” is too broad for HS or compliance. Identify the measuring principle, degree of completion, signal interface, wireless function, power/battery and end-use.

VARIANT	WHAT TO CHECK	EVIDENCE	POSSIBLE TRIGGER	APPLICATION NOTE
Thermocouple / RTD (PT100/PT1000)	Measuring principle, range, mV/Ω output, transmitter included or not	Datasheet, wiring, accuracy, range	HS/compliance may differ between bare probe and finished instrument	Do not automatically use the same conclusion
Thermistor / NTC / PTC	Bare sensing element or finished measuring module	BOM, schematic, catalogue	May be an electronic component/part rather than a complete thermometer	Separate component analysis
Digital temperature sensor	Power; 4–20mA/0–10V/RS485/IO-Link; display	Datasheet, protocol, label	Industrial EMC/conformity	Lock exact model/interface
Wireless / LPWAN sensor	Wi-Fi/Bluetooth/LoRa/LPWAN, band, Tx power, battery	RF spec, module ID, battery data	Radio conformity + battery transport	Do not transfer wired conclusion
Infrared / non-contact	Optics, direct reading, medical vs industrial end-use	Catalogue, end-use, accuracy	Different HS/market rules may apply	Separate medical/clinical variants
Probe / spare part only	Standalone measuring function or only a component	BOM, drawing, system architecture	Parts heading or other heading may apply	Lock actual functional role

Warning: thermocouples, RTDs, thermistors, infrared sensors, wireless air-temperature sensors and bare probes should not share one HS/compliance conclusion merely because they are all called temperature sensors.

3. EXPORT MARKETS & MARKET ACCESS

The market scan uses HS 902519 as a trade-data proxy. It covers a wider family of thermometers/pyrometers and is not a final classification for every industrial temperature sensor.

DATA NOTE: the WITS 902519 page uses HS 1988/92 (H0) nomenclature. It is only a market-signal proxy and must not be treated as the current Vietnamese AHTN/HS classification for a specific model.

Market conclusion: South Korea is selected as the primary market because the 2024 proxy shows USD 62.72m of imports from Vietnam and the market has a distinct conformity-assessment route that materially affects pre-shipment work. Do not use this table as a strict cross-market ranking where the source years differ.

MARKET	FIT	TRADE SIGNAL	MARKET ACCESS	DATA TO LOCK
South Korea	High / primary	WITS 2024: Korea imported USD 62.72m from Vietnam under HS 902519 proxy; total imports USD 268.06m.	Screen RRA/KC by equipment category; wireless adds radio route.	Technical file, model list, test/registration file if applicable, origin evidence.
United States	High / comparison	WITS 2023: imports from Vietnam under proxy USD 27.42m.	FCC screening where radio/digital-emission trigger applies; separate buyer UL/ETL from law.	RF/digital specs if applicable; buyer compliance matrix.
China	Medium / comparison	WITS 2024: imports from Vietnam under proxy USD 5.59m.	Radio-transmitting models may trigger type approval; do not apply SRRC to wired models by default.	Frequency/power/model/importer data.
European Union	Medium / comparison	WITS 2024: imports from Vietnam under proxy USD 4.43m.	Apply CE framework only by scope: EMC; RED for radio; RoHS for EEE; LVD only within voltage limits.	EU DoC/technical file/test/label as applicable.

WITS – KOREA 2024 WITS – VIETNAM 2023 WITS – EU 2024 WITS – CHINA 2024

Keep three layers separate: destination-country law ≠ FTA preference conditions ≠ buyer-specific requirements.

4. VIETNAM EXPORT CONDITIONS / POLICY

CONCLUSION

Do not conclude “no permit required” from the generic product name. Screen the exact function, wireless/encryption, battery/power, condition and end-use.

LEGAL FRAMEWORK

Use the current Customs Law framework, Decree 69/2018/ND-CP on foreign trade management and customs procedures as amended by Circular 121/2025/TT-BTC, effective 1 Feb 2026.

ACTION

Before contract, collect model datasheet, core measuring function, new/used status, destination/end-use, RF frequency/power if any, and battery/power data.

5. HS CODE – EXPORT DUTY – EXPORT VAT

Classify from measuring function → construction → degree of completion → interface → wireless → component vs finished instrument.

PRODUCT / VARIANT	REFERENCE HS	CLASSIFICATION BASIS	EXPORT DUTY	EXPORT VAT	EVIDENCE
Complete electrically operated temperature-measuring sensor/instrument	9025.19.19 – reference	Main function measures temperature; not combined with other instruments	Check current export tariff after final HS	Check 0% VAT conditions	Catalogue, principle, range, output, wiring
Non-electrical type	9025.19.20 – reference	Other thermometer/pyrometer, non-electrical	Check current schedule	Check export VAT conditions	Construction/principle docs
Air-temperature sensor transmitting via LPWAN	9025.19.19 has a specific Vietnamese legal description	Air temperature measurement + LPWAN transmission	Do not generalize	Check VAT conditions	RF spec + measuring function + exact model
Bare probe / sensing element / part	Do not classify by the generic name	Component role and standalone function are decisive	Per final HS	Per transaction documents	BOM, drawing, system architecture

Vietnamese legal schedules contain a specific 9025.19.19 description for an air-temperature sensor transmitting measurements through LPWAN. This is evidence for that configuration only, not every temperature sensor.

EXPORT DUTY

Decree 26/2023/ND-CP is the base export tariff; Decree 201/2026/ND-CP amended selected rates effective 23 Jul 2026. State a specific rate only after checking the final HS against the current Appendix I.

VAT

0% is conditional, not automatic. Decree 181/2025/ND-CP addresses the 0% rate and its conditions in Articles 17–18.

The current tariff schedule must be checked using the final HS and actual shipment documents.

9025.19.19 – OFFICIAL GAZETTE DECREE 26/2023 DECREE 201/2026 DECREE 181/2025 – VAT

6. C/O – FTA – RULES OF ORIGIN

For Korea, compare VKFTA and RCEP based on the final tariff line, PSR, origin evidence and buyer/importer needs.

ROUTE	FTA	ORIGIN PROOF	PSR	AUDIT TRAIL
South Korea – option 1	VKFTA	Form VK / current origin proof mechanism	Check final-HS PSR in the current product-specific rule annex	BOM, cost statement, supplier/production records
South Korea – comparison	RCEP	RCEP proof of origin	Circular 32/2022 moved PSR to HS 2022 from 1 Jan 2023	Compare actual tariff + PSR + evidence with VKFTA
United States	No bilateral FTA currently in force	Origin evidence as required	No automatic preferential C/O	Origin file for buyer/verification
China	ACFTA / RCEP	Applicable proof	Check final-HS PSR	BOM/material/transport evidence
EU	EVFTA	EUR.1 / applicable origin mechanism	Check final-HS PSR	Origin Audit Trail and transport evidence if required

VKFTA: Circular 09/2022/TT-BCT replaced the entire product-specific rule appendix under Circular 40/2015/TT-BCT; the revised PSR list took effect on 1 Aug 2022. This article does not pre-assign CTH/RVC to 9025.19 without final model/HS verification.

VKFTA – CIRCULAR 09/2022 RCEP – CIRCULAR 32/2022

7. PRODUCT- & MARKET-SPECIFIC COMPLIANCE

SOUTH KOREA — RRA / KC

Article 58-2 of the Radio Waves Act establishes conformity assessment for broadcasting/communications equipment and machinery that causes or is affected by electromagnetic interference. RRA guidance lists “measuring instrument, industrial device, connector, etc.” as examples that may fall under Registration of Compatibility. A wired industrial temperature sensor therefore still needs exact equipment-category/EMC screening; a wireless model requires an additional radio route.

Do not write “all temperature sensors require KC”. The conclusion depends on exact model, power, digital circuitry, radio interface, installation and the current RRA equipment tables/standards.

WIRELESS / BATTERY VARIANTS

Lock frequency band, Tx power, antenna, radio module certification/ID and host integration. For lithium batteries, screen UN 38.3, Wh, cell/battery configuration and carrier packing requirements.

COMPARISON MARKETS

China: radio-transmitting equipment must be screened against type-approval rules; wired sensors should not be assumed to require SRRC. EU: screen EMC/RED/RoHS by scope. U.S.: screen FCC where radio/digital-emission rules apply. Buyer calibration/IP/UL/ETL requirements remain a separate contractual layer unless a law specifically makes them mandatory.

RRA – CONFORMITY RRA – CURRENT NOTICES KOREA RADIO WAVES ACT CHINA RADIO REGULATION

8. EXPORT DOCUMENT SET & FILING CHANNELS

GROUP	DOCUMENTS	WORKFLOW USE	OWNER	DATA TO MATCH	COMMON ERROR
Commercial	Contract/PO, Invoice, Packing List	Contract → customs → buyer	Sales / Docs	Model, description, quantity, value, Incoterm	Generic “sensor” description
Customs	Declaration + required supporting docs	Export customs	Customs / Docs	HS, model, value, origin, quantity	HS selected from trade name
Technical / compliance	Datasheet, wiring, range, accuracy, output, power; RRA/test file if applicable	Pre-contract / pre-Cargo Ready	Engineering / QA / Compliance	Exact model, HW revision, radio module	Certificate scope mismatch
Origin	C/O, BOM, cost statement, supplier and production evidence	C/O / verification	Docs / Factory / Procurement	HS, criterion, invoice, lot	Missing audit trail
Transport / buyer	Booking, SI, VGM, B/L/AWB, insurance, L/C docs	Shipping / post-shipment	Forwarder / Docs / Finance	Packages, weights, parties, marks	Missed cut-off / discrepancy

FILING CHANNELS: the Vietnam export declaration is filed electronically through the current customs system; C/O applications follow the competent issuing authority’s current electronic/origin procedure. Korean RRA/KC filings are handled by the importer/manufacturer/responsible party under RRA procedures when the exact model falls within scope.

Model-data checklist: exact model · measuring principle · range · accuracy · response time · output/interface · supply voltage · wired/wireless · radio band/Tx power · battery · housing/IP · serial/batch · origin · end-use.

9. LEGAL BASIS – THREE-LAYER MATRIX

LAYER	SOURCE	AUTHORITY	EFFECTIVE / DATE	ARTICLE / ANNEX	APPLICATION	OLD → NEW / NOTE
Vietnam – customs	Circular 121/2025/TT-BTC	Ministry of Finance	1 Feb 2026	Amends customs/import-export tax circulars	Export customs procedures	Use current process
Vietnam – export tariff	Decree 26/2023 + 201/2026	Government	201/2026: 23 Jul 2026	Appendix I / amended goods	Export-duty check	201 amends selected rates
Vietnam – VAT	Decree 181/2025	Government	Current	Articles 17–18	0% rate + conditions	Not automatic
FTA – VKFTA	Circular 40/2015 + 09/2022	MOIT	Revised PSR 1 Aug 2022	PSR appendix	Form VK / origin	09/2022 replaced PSR appendix
FTA – RCEP	Circular 05/2022 + 32/2022	MOIT	1 Jan 2023	HS 2022 PSR	RCEP origin	PSR moved to HS 2022
Korea – conformity	Radio Waves Act, Art. 58-2	Republic of Korea / RRA	Check current text	Art. 58-2	Certification/registration by scope	Not universal to every sensor
Korea – RRA notice	Current Conformity Assessment Notice	RRA	Check the RRA notice/equipment table in force at the time of import	Equipment tables	Route/standards/marking	Check exact model

GATE / STOP POINT

Unable to reconstruct model/version/origin evidence during later verification.

11. PRE-ETD / CARGO READY / CUT-OFF TIMELINE

MILESTONE	LOCK	DOCUMENT / DATA	OWNER	DELAY RISK
Before Contract	Product scope, market access, preliminary HS, VKFTA/RCEP, buyer compliance	Datasheet, RF spec, buyer requirements, origin inputs	Sales / Compliance / Engineering	Order accepted but model fails market requirements
Before Cargo Ready	Final HS, RRA route, tests/registration if applicable, label, origin evidence	Test/cert, artwork, BOM, packing data	QA / Compliance / Docs	Goods ready but documentation does not cover model
Before CY/CFS cut-off	Customs, trucking, gate-in/CFS	Declaration, booking, packages/GW	Ops / Customs / Forwarder	Roll/rebooking/storage
Before SI/VGM cut-off	Lock transport document data and weight	SI, VGM, parties, marks	Docs / Forwarder	Amendment/discrepancy
After on-board	C/O, final transport docs, buyer/bank set, archive	On-board data, C/O, Final B/L/AWB, payment file	Docs / Finance	Late documents / delayed payment

Do not invent fixed T-7/T-3 lead times without an actual carrier schedule, certification lead time and buyer requirement.

12. INCOTERMS – TRANSPORT – PACKING – COST

INCOTERMS

FCA/FOB/CPT/CIP/DAP may be appropriate depending on mode and buyer. Keep risk transfer separate from cost allocation; use DDP only if the seller can truly control Korean import taxes and compliance.

TRANSPORT & PACKING

Air is suitable for small/high-value/urgent lots; sea/LCL for larger volumes. Protect probes/connectors from shock, moisture and ESD; screen ISPM 15 for wood packaging. Battery models require separate DG screening.

COST BUDGET

Testing/conformity, origin/C/O, export customs, packing, trucking, local charges, freight, insurance and amendment/rebooking/storage when incurred. Do not publish fixed local charges without a quotation.

13. RISKS & CONTROL POINTS

RISK	ROOT CAUSE	IMPACT	CONTROL	WHEN
Wrong product scope	RTD/thermistor/wireless/IR treated as one product	Wrong HS/compliance	Model technical-classification file	Pre-contract
902519 proxy used as final HS	Trade data confused with customs classification	Wrong declaration/C/O	Final classification from function/docs	Pre-customs/C/O
RRA scope mismatch	Certificate covers different HW/radio revision	Importer hold/retest	Model matrix + scope review	Pre-Cargo Ready
Wireless module/band change	Engineering change after compliance	Prior route becomes invalid	Engineering-QA-Docs change control	Pre-production/shipment
Origin PSR failure	Missing BOM/cost/supplier proof	Preference lost / verification	Origin Audit Trail	Before C/O
Damage / calibration drift	Poor shock/moisture packing	Buyer claim	Packing + calibration record if required	Packing
Missed cut-off	Booking/customs/SI/VGM delay	Roll/rebooking	Milestone owner sheet	Pre-gate-in

14. FAQ

1. Can temperature sensors be exported from Vietnam?

Assess the exact model, function, wireless, battery/power, condition and end-use; do not make an absolute permit statement from the generic name.

2. Does HS 9025.19.19 apply to every temperature sensor?

No. It is a reference for certain electrically operated devices, including a specific Vietnamese legal description for an LPWAN air-temperature sensor. Bare probes/elements can classify differently.

3. Why is South Korea the primary market?

The 2024 WITS proxy shows about USD 62.72m of Korean imports from Vietnam under HS 902519, plus a distinct RRA conformity route that affects pre-shipment planning.

4. Does every model require KC/RRA?

No. Applicability depends on the exact equipment category and current technical standards; wireless models require additional radio screening.

5. Can a wired sensor still need EMC review in Korea?

Yes. RRA guidance lists measuring instruments/industrial equipment among conformity-registration examples; verify the actual equipment table.

6. What changes for Wi-Fi/Bluetooth/LoRa/LPWAN?

Lock band, Tx power, antenna, radio module and host integration; review the Korean radio route and battery transport where applicable.

7. VKFTA or RCEP?

Compare actual tariff at the final HS, PSR, origin evidence and importer preference. Do not choose by form familiarity alone.

8. Is export VAT automatically 0%?

No. The 0% rate is conditional and depends on transaction type and supporting documents.

9. What technical data are needed for HS classification?

Catalogue/datasheet, measuring principle, range, accuracy, output/interface, power, wireless spec, BOM/drawing and component vs finished-instrument role.

10. What should be archived after on-board?

Completed declaration, final transport docs, C/O/origin audit trail, technical/compliance file, buyer/bank set, payment evidence and claim records if any.

15. POST-SHIPMENT OUTPUTS & ARCHIVE

Completed export declaration and customs supporting set.
Final B/L/AWB/Sea Waybill.
C/O and Origin Audit Trail.
Exact-model technical file, including RRA/radio records if in scope.
Buyer/bank document set.
Payment, debit/credit note and claim/survey records if any.
Model/version change-control record for future verification.

GIẢI PHÁP TỪ TGIMEX

For temperature sensors, the critical control is to lock model – HS – origin/FTA – Korean compliance – booking data before Cargo Ready.

PRODUCT & POLICY REVIEW

Model, function, HS, wireless/battery and export-policy screening.

MARKET & ORIGIN REVIEW

RRA/KC route, buyer requirements, VKFTA/RCEP and Origin Audit Trail.

SHIPMENT CONTROL

Invoice – PL – customs – SI/VGM – B/L/AWB – C/O – post-shipment documents.

ELECTRICAL – ELECTRONICS – IT EQUIPMENT

F&B

MACHINERY

HOUSEHOLD GOODS

COSMETICS – PERSONAL CARE

ELECTRICAL – ELECTRONICS – IT EQUIPMENT

F&B – FOOD & BEVERAGE

MACHINERY

HOUSEHOLD GOODS

COSMETICS – PERSONAL CARE

EXPORT PROCEDURE FOR TEMPERATURE SENSORS TO SOUTH KOREA

1. QUICK OVERVIEW

2. PRODUCT SCOPE & DETAILED CLASSIFICATION

3. EXPORT MARKETS & MARKET ACCESS

4. VIETNAM EXPORT CONDITIONS / POLICY

5. HS CODE – EXPORT DUTY – EXPORT VAT

6. C/O – FTA – RULES OF ORIGIN

7. PRODUCT- & MARKET-SPECIFIC COMPLIANCE

SOUTH KOREA — RRA / KC

WIRELESS / BATTERY VARIANTS

COMPARISON MARKETS

8. EXPORT DOCUMENT SET & FILING CHANNELS

9. LEGAL BASIS – THREE-LAYER MATRIX

10. PRACTICAL E2E EXPORT PROCESS

PRODUCT SCOPE + MARKET SCAN

HS – POLICY – FTA

CONTRACT + BUYER REQUIREMENTS

KOREA COMPLIANCE

BOOKING – PACKING – TRUCKING

EXPORT DECLARATION

SI – VGM – CY/CFS – LOADING

FINAL DOCS – PAYMENT – ARCHIVE