Lutron UV-340A Ultraviolet Light Meter, UVA and UVB, 290 to 390 nm, with Remote Sensor
The Lutron UV-340A measures ultraviolet irradiance in microwatts per square centimeter across a 290 to 390 nm band, covering UVA and the upper part of UVB. Two ranges cover weak sources at 1 µW/cm² resolution and strong ones up to 19,990 µW/cm².
The sensor is on a separate corded probe, which matters for this measurement more than most. Ultraviolet sources are things you should not be standing next to — curing lamps, sterilizers, exposure units, arc welding. A corded probe goes where the UV is while you stay back and read the display, and it reaches into a cabinet or under a lamp head where a one-piece meter will not fit. The sensor carries a cosine correction filter, so light arriving at an angle is weighted correctly rather than over-counted.
This meter does not measure UVC. Its band is 290 to 390 nm. Germicidal lamps used for disinfection emit at 254 nm, which is outside this range — the UV-340A will not read them correctly and must not be used to verify germicidal output or to judge whether a UVC lamp is safely off. For 254 nm work use a UVC-254 meter or the YK-37UVSD, which covers both UVA and UVC.
Typical Applications
Industrial:
- Curing of inks, adhesives and coatings under UVA lamps — verifying lamp output before a run and tracking it as lamps age.
- Photoresist exposure and graphic arts platemaking.
- Photochemical matching.
- EPROM erasure.
- Monitoring ultraviolet radiation hazards around welding operations.
- Blacklight and inspection lamp output checks, including magnetic particle and dye penetrant inspection.
- Tanning equipment output verification.
Laboratory:
- Weathering and degradation studies.
- Virology and microbial genetics.
- DNA research and transilluminator output checks.
- Biological safety hoods fitted with UVA or UVB sources.
- General laboratory use.
Features
- Professional, high quality ultraviolet meter.
- Ultraviolet irradiance measurement for UVA and UVB.
- Detector spectrum from 290 nm to 390 nm.
- Two measurement ranges, 1999 and 19,990 µW/cm².
- Exclusive ultraviolet sensor structure.
- Sensor with cosine correction filter, so light arriving at an angle is weighted correctly.
- Built-in zero button.
- Separate ultraviolet probe on a coiled cable, so the sensor can be placed at the optimum position while the meter is read from a safe distance.
- Microprocessor circuit provides high reliability and durability.
- LCD display for easy readout.
- Low battery indicator.
- Heavy duty, compact housing.
Specifications
- Sensor spectrum: band pass 290 nm to 390 nm.
- Low range: 0 to 1999 µW/cm², 1 µW/cm² resolution.
- High range: 0 to 19,990 µW/cm², 10 µW/cm² resolution.
- Accuracy: ± (4% F.S. + 2 digits). Calibration is performed under UVA light against a standard UVA meter.
- Sensor: exclusive ultraviolet photo sensor with cosine correction filter.
- Controls: power button, zero button, range switch.
- Zero function: operates on the low range only, and only when the display reads 100 µW/cm² or less.
- Display: 18 x 45 mm LCD, maximum indication 1999.
- Over range indication: shown on the display when the reading exceeds the selected range.
- Display sampling time: approximately 1 second.
- Circuit: microprocessor.
- Meter dimensions: 5.2 x 2.8 x 1.0" (131 x 70 x 25 mm).
- Sensor probe head: 1.8" diameter x 1.3" (45 mm diameter x 32 mm).
- Sensor probe handle: 4.9" x 0.9" diameter (125 x 24 mm diameter).
- Probe cable: 55" coiled.
- Weight: 8.9 oz (251 g), battery included.
- Operating temperature: 32 to 122 °F (0 to 50 °C). NOTE most batteries are not rated for use below -4 °F or above 125 °F.
- Operating humidity: less than 85% RH.
- Power supply: one 9V (006P, MN1604, PP3) battery, not included.
- Power consumption: approximately 6 mA DC.
Note that 1000 µW/cm² equals 1 mW/cm². Specifications are tested in an environment with RF field strength less than 3 V/m and frequency less than 30 MHz.
Sensor Storage
The ultraviolet sensor must be stored dry. Seal the probe in a plastic bag with a desiccant pack whenever the meter is not in use, and take it out only to measure. Moisture reduces the sensor's gain over time, which shortens the calibration interval and eventually costs accuracy. Replace the desiccant periodically.
Accessories Included
- Remote ultraviolet sensor probe with 55" coiled cable.
- Sensor cover.
- Instruction manual.
- One year limited manufacturer's warranty.
Optional Components
- Soft carrying case, CA-52A.
- Soft carrying case, CA-03.
