Senseca

LPPHOT03 Photometric Probe

Outdoor illuminance probe with photopic V(λ) spectral response and cosine correction.

Illuminance measurement in lux with <4% calibration uncertainty
Passive mV output without external power supply
4…20 mA or 0…10 Vdc outputs, scaled 0…150 klux
RS485 Modbus-RTU output with selectable 0…20 or 0…200 klux ranges
Operating temperature −20…+60 °C
Output configurations vary by model

Quantity

Overview

The Senseca LPPHOT03 is an outdoor photometric probe designed to measure illuminance in lux, with a spectral response similar to the standard photopic curve V(λ) of the human eye. It features a diffuser for cosine correction and a protective dome for outdoor measurements. Each probe is individually calibrated against a reference luxmeter calibrated by a Primary Metrological Laboratory, with a calibration uncertainty of less than 4%.

The LPPHOT03 and LPPHOT03BL versions provide passive mV output without requiring an external power supply. The LPPHOT03BLAC and LPPHOT03BLAV versions offer normalized 4…20 mA and 0…10 Vdc outputs, respectively, both scaled from 0…150 klux. The LPPHOT03BLS version provides RS485 Modbus-RTU communication with selectable 0…20 klux and 0…200 klux measuring ranges. BL versions feature a base with a levelling device, and all versions operate from −20…+60 °C.

Typical Applications

Outdoor illuminance monitoring
Daylight and artificial light level measurement
Photometric measurements aligned with human visual response
Integration with analogue or RS485 Modbus-RTU data acquisition systems

Key Features

Illuminance measurement in lux with photopic V(λ) spectral response
Diffuser for cosine correction and protective dome for outdoor use
Photopic response error f'1 <6%, cosine response error f2 <3% and linearity error f3 <1%
Individual calibration against a reference luxmeter with <4% calibration uncertainty
Passive mV/klux output without external power supply
Normalized 4…20 mA or 0…10 Vdc outputs, scaled 0…150 klux
RS485 Modbus-RTU output with selectable 0…20 klux or 0…200 klux ranges
Base with levelling device on BL versions
Operating temperature −20…+60 °C
4-pole M12 connector for mV and analogue versions; 8-pole M12 connector for RS485 version

Benefits

Illuminance measurements aligned with human visual response
Cosine correction supports outdoor light measurements
Individual calibration provides a documented calibration reference
No external power supply needed for passive mV versions
Choice of output configurations for different monitoring systems
Easier probe positioning with the levelling device on BL versions

Specifications

Measurement
Measured quantity	Illuminance
Measurement unit	lux
Spectral range	V(λ)
Typical sensitivity	0.5…1.5 mV/(klux)
Calibration uncertainty	<4%
Photopic response error (f'1)	<6%
Cosine response error (f2)	<3%
Linearity error (f3)	<1%
Impedance (non-normalized version)	0.5…1.0 kΩ

Model	Output	Measuring range / scaling
LPPHOT03	mV/klux	Not specified in datasheet
LPPHOT03BL	mV/klux	Not specified in datasheet
LPPHOT03BLAC	4…20 mA	4 mA = 0 klux; 20 mA = 150 klux
LPPHOT03BLAV	0…10 Vdc	0 V = 0 klux; 10 V = 150 klux
LPPHOT03BLS	RS485 Modbus-RTU	Selectable 0…20 klux or 0…200 klux

RS485 Modbus-RTU
Communication interface	RS485
Communication protocol	Modbus-RTU
Low measuring range	0…20,000 lux
High measuring range	0…200,000 lux
Range selection	Serial command
Measurement register	Address 2
Measurement data format	16-bit integer
Low-range measurement register scaling	Register value represents illuminance in lux
High-range measurement register scaling	Illuminance (lux) = register value × 10; resolution 10 lux
Status register	Address 3
Status register format	16-bit integer
Status bit 0	Measurement error when set to 1
Status bit 2	Configuration data error when set to 1
Status bit 3	Program memory error when set to 1
Average value register	Address 4
Averaging	Last 4 measurements
Sensor signal register	Address 5
Low-range sensor signal scaling	Sensor signal in µV
High-range sensor signal scaling	Sensor signal (µV) = register value × 10; resolution 10 µV

Electrical
Passive mV output	No external power supply required
4…20 mA normalized output	10…30 Vdc
0…10 Vdc normalized output	15…30 Vdc
RS485 Modbus-RTU output	5…30 Vdc

Environmental
Intended use	Outdoor photometric measurements
Operating temperature	−20…+60 °C

Construction and Connection
Cosine correction component	Diffuser
Protective component	Glass dome
Connector type	M12 male connector
4-pole M12 connector	LPPHOT03, LPPHOT03BL, LPPHOT03BLAC and LPPHOT03BLAV
8-pole M12 connector	LPPHOT03BLS
Levelling device	Base with levelling device on BL versions
Available cable lengths	2 m, 5 m or 10 m
Cable connection	Female M12 connector
Cable ordering	Ordered separately

Calibration
Calibration	Individually calibrated
Calibration method	Comparison with a reference luxmeter
Reference luxmeter	Calibrated by a Primary Metrological Laboratory
Calibration procedure	CEI Publication No. 69 (1987)
Calibration factor	Shown on the probe housing
Calibration documentation	Calibration report

Drawing

Downloads

LPPHOT03 Family Datasheet	DownloadLPPHOT03 Family Datasheet
LPPHOT03 Family CE Declaration of Conformity	DownloadLPPHOT03 Family CE Declaration of Conformity