Outdoor light measurement needs a probe that follows visual perception and keeps readings stable under changing sky conditions. LPPHOT03 measures illuminance in lux with a spectral response matched to the standard photopic curve V(λ), making it suited to photometric monitoring where daylight or artificial light levels must be quantified.
Each probe is individually calibrated, with the calibration factor shown on the housing for mV versions. The diffuser provides cosine correction, while the protection dome supports outdoor readings. The BL versions add a base with levelling device to help position the sensing surface correctly.
System integration is available from simple passive measurement to networked acquisition. Standard LPPHOT03 versions provide mV/klux output without power supply. BLAC and BLAV versions offer normalized 4…20 mA or 0…10 Vdc outputs scaled 0…150 klux, while LPPHOT03BLS provides RS485 Modbus-RTU output over 0…200 klux.
The probe measures illuminance in lux, defined as luminous flux passing through a surface divided by the surface area.
mV versions require no power supply. The photocurrent from the photodiode is converted into a potential difference read by a voltmeter.
LPPHOT03BLAC provides 4…20 mA output and LPPHOT03BLAV provides 0…10 Vdc output, both scaled from 0 to 150 klux.
LPPHOT03BLS provides RS485 Modbus-RTU output with selectable 0…20,000 lux low range or 0…200,000 lux high range.
Calibration is carried out by comparison with a reference luxmeter calibrated by a Primary Metrological Laboratory.
Versions use M12 connectors, with 4-pole cables for mV and analog outputs and 8-pole cables for RS485 Modbus-RTU versions.
Code: LPPHOT03 [1]
Example: LPPHOT03BLAV
[1] Option
Blank = µV/(µW/cm²) output
BL = µV/(µW/cm²) output, base with levelling device
BLAC = base with levelling device output 4...20 mA
BLAV = base with levelling device output 0...10 V
BLS = RS485 MODBUS-RTU output, base with levelling device
