1. Introduzione
The Lutron YK-37UVSD is a professional-grade light meter designed for accurate measurement of both UVA and UVC light. This device features a microprocessor circuit for high reliability and durability, making it suitable for various applications including monitoring blue light radiation hazards, UV sterilization, graphic arts, photochemical matching, UV EPROM erasure, photoresist exposure, and curing of inks, adhesives, and coatings. It includes an SD card real-time data logger and supports Type K temperature measurements.
This manual provides detailed instructions for the setup, operation, maintenance, and troubleshooting of your YK-37UVSD light meter.
2. Informazioni di sicurezza
- Leghjite attentamente tutte e struzzioni prima di uperà u dispusitivu.
- Do not expose the device to extreme temperatures, humidity, or direct sunlight for prolonged periods.
- Evitate di abbandunà u dispusitivu o di sottumessu à forti impatti.
- Do not attempt to open or modify the device; this will void the warranty.
- Assicuratevi chì e batterie sianu inserite cù a polarità curretta. Eliminate e batterie se u dispusitivu ùn serà micca adupratu per un periodu prolongatu.
- Keep the probes clean and free from dust or debris to ensure accurate readings.
3. Produttu Finituview
3.1 Unità principale
The main unit features an LCD display, control buttons for power, function, data hold, recording, zero adjustment, and data logging. It also includes slots for the SD card and probe connections.

Figura 1: Fronte view of the Lutron YK-37UVSD main unit, showing the LCD display and control buttons.
3.2 UVA and UVC Probes
The meter comes with two specialized probes: one for UVA measurement and another for UVC measurement. Both probes feature a cosine correction filter for accurate light detection.

Figura 2: Separate UVA and UVC probes. The UVA probe has a cylindrical body, while the UVC probe has a flat, circular sensor head.
4. Setup
4.1 Installazione di batterie
- Truvate u coperchiu di u compartimentu di a batteria nant'à u spinu di l'unità principale.
- Trascinate a tappa aperta.
- Insert six (6) 1.5V AA (UM-3) batteries, ensuring correct polarity as indicated inside the compartment.
- Sustituite a tappa di u compartimentu di a bateria.
4.2 Cunnessione di a sonda
- Identify the desired probe (UVA or UVC) for your measurement.
- Connect the probe's cable connector to the corresponding input jack on the top or side of the main unit. Ensure a secure connection.
4.3 Inserimentu di a carta SD
- Locate the SD card slot on the side of the main unit.
- Insert a formatted SD card (up to 16 GB) into the slot until it clicks into place.
- Per caccià, spinghje delicatamente a carta versu l'internu finu à ch'ella spunti fora.
5. Operating Instructions
5.1 Accensione / spegnimentu
Press u POWER/ESC button to turn the meter on. Press and hold the POWER/ESC buttone per uni pochi secondi per spegnelu.
5.2 Measurement Mode Selection
After powering on, the meter will display the current measurement mode. To switch between UVA and UVC modes, press the dedicated UVA/UVC button (if available) or cycle through modes using the FUNC/HOLD/NEXT button as per the on-screen prompts.
5.3 Selezzione di Gamma
The YK-37UVSD offers two measurement ranges: 2 mW/cm² and 20 mW/cm². The meter typically auto-ranges, but you may be able to manually select a range using the SET button or a combination of buttons as described in the on-screen menu.
5.4 Funzione Data Hold
Press u HOLD buttone (spessu cumminatu cù FUNC/NEXT) to freeze the current reading on the display. Press it again to release the hold function.
5.5 Ajustamentu Zero
For accurate measurements, especially in low light conditions, a zero adjustment may be necessary. With the probe covered or in a dark environment, press the ZERU button to calibrate the meter to zero.
5.6 Data Logging (SD Card)
To initiate real-time data logging to the SD card:
- Ensure an SD card is inserted.
- Press u LOGGER button. The display will indicate that logging has started.
- To stop logging, press the LOGGER buttone di novu.
- Data is saved in a format compatible with spreadsheet software for easy analysis.
5.7 Type K Temperature Measurement
The YK-37UVSD also supports Type K thermocouple temperature measurements. Connect a Type K thermocouple probe (sold separately) to the designated input. Use the FUNC/NEXT button to switch to temperature measurement mode.
6. Mantenimentu
6.1 Pulizia
Wipe the device and probes with a soft, dry cloth. For stubborn dirt, a slightly damp Un pannu cù un detergente dolce pò esse adupratu, assicurendu chì nisun liquidu ùn entre in l'apparechju. Ùn aduprate micca detergenti abrasivi o solventi.
6.2 Sustituzione di batterie
When the low battery indicator appears on the display, replace all six AA batteries promptly to ensure continued accurate operation. Refer to section 4.1 for battery installation instructions.
6.3 Storage
Store the meter and probes in a cool, dry place, away from direct sunlight and extreme temperatures. If storing for an extended period, remove the batteries to prevent leakage.
7. Risoluzione di prublemi
- Nisun schermu / Dispositivu chì ùn si accende micca: Check battery installation and ensure batteries are fresh. If using an AC adapter, verify the connection and power source.
- Letture inaccurate: Ensure probes are clean and properly connected. Perform a zero adjustment. Verify that the correct measurement mode (UVA/UVC) is selected.
- Errore di a carta SD: Ensure the SD card is properly inserted and formatted. Try a different SD card if the issue persists.
- Data Logging Not Working: Check if the SD card has sufficient free space. Ensure the logging function is activated correctly.
Sè i prublemi persistenu dopu avè pruvatu ste suluzioni, cuntattate l'assistenza clienti.
8. Specificazioni
The following table outlines the key specifications of the Lutron YK-37UVSD UVA and UVC Light Meter:

Figura 3: Detailed specification sheet for the Lutron YK-37UVSD, providing comprehensive technical data.
| Feature | Specificazione |
|---|---|
| Mudellu | YK-37UVSD |
| Intervalli di misurazione | UVA: 2 mW/cm², 20 mW/cm² UVC: 2 mW/cm², 20 mW/cm² |
| Tipu di sensor | UVA probe, UVC probe with cosine correction filter |
| Mostra | LCD |
| Data Logger | SD Card (1 GB to 16 GB), Real-time data logging |
| Misurazione di a temperatura | Type K Thermocouple (optional probe) |
| Alimentazione elettrica | 6 x 1.5V AA (UM-3) batteries or DC 9V adapter |
| Umidità operativa | Meno di 85% RH |
| Dimensioni (unità principale) | Circa 203 x 76 x 38 mm (8 x 3 x 1.5 pollici) |
| Peso (Unità Principale) | Circa. 300 g (0.66 lbs) |
| Paese d'origine | Taiwan |
| Pesu di l'articulu | 426 g |
| Dimensioni di u produttu | 30.48 x 15.24 x 10.16 cm |
9. Garanzia è Support
9.1 Garanzia infurmazione
This product is manufactured by Lutron. For specific warranty terms and conditions, please refer to the warranty card included with your product or contact the manufacturer directly. Warranty coverage typically includes defects in materials and workmanship under normal use.
9.2 Assistenza Clienti
For technical assistance, troubleshooting not covered in this manual, or service inquiries, please contact the seller or the authorized Lutron service center in your region. Please have your model number (YK-37UVSD) and purchase information ready when contacting support.