ULM-500 Light Meter & Logger

Version:

Product

Universal Light Meter & Data Logger

ULM-500 Light Meter & Logger

Program

WinControl-3 System Control and Data Acquisition Program (Microsoft Windows 10 and 11) for operation of measuring system via PC, data acquisition and analysis. Not compatible with Windows 10 on ARM

Saturation Pulse Analysis

Measured: Ft, F0, FM, F, F0’ (also calculated), FM’. Depending on the leaf clip connected, the software can record PAR, temperature and also humidity. [In the case of the MINI-PAM-II clip humidity can be measured, which the clip of the JUNIOR-PAM cannot.]
Calculated: F0’ (also measured), FV/FM and Y(II) (maximum and effective photochemical yield of PS II, respectively), qL, qP, qN, NPQ, Y(NPQ), Y(NO) and ETR (electron transport rate)

Fitting Routines

Two routines for determination of the cardinal points α, Ik and ETRmax of light curves

Programmed Features

Automatic determination of signal offset for all light intensities and gain levels. Automatic calibration of internal PAR sensor against an external PAR sensor connected to the instrument

Computer Requirements

Processor: 0.8 GHz, RAM: 512 MB, screen resolution: 1024 x 600 pixels, interface: USB 2.0/3.0

Communication Protocol

USB

Design of sensor

Mini quantum sensor for selective PAR (photosynthetically active radiation) measurement, cosine corrected for PPFD (photosynthetical photon flux density) measurement.

Sensor housing

Black anodized aluminum housing

Diffuser material

Perspex

Signal detection

High stability silicone photovoltaic detector with filter set for PAR correction (to learn more about the typical sensitivity see “General Features”). Signal output typically -2 μA / (1000 μmol m-2 s-1)

Temperature coefficient of photodiode

0.01 %/K

Absolute calibration

± 5 %

Angular dependence

error < 4 % between angles from -80° to +80° from normal axis

Immersion coefficient

Typically 1.32

Operating temperature

- 5 °C … + 45 °C

Cable length

3 m

Connector

BNC

Power supply

Not required

Size

Height: 16 mm
Diameter: 14 mm
Diffuser diameter: 5.5 mm

Weight

32 g

Accessories

Design

Light grey plastic housing with connectors, membrane keyboard and a white illuminated LCD graphic display

Dimensions

12 x 7.5 x 3.5 cm

Weight

210 g (including 4 AAA 1.5 V batteries)

Power supply

4 AAA-type batteries or 5 V DC from USB voltage source when connected to the computer

Working conditions

up to 85 % rH (avoid condensation), - 20° to + 50°C ambient temperature

Time resolution

PAR channel #1: 100 samples / second, PAR channel #2 and other channels: 5 samples / second (connected to computer running WinControl-3 software)

Operation time

10 days or ca. 100 days automated logging with sleep mode (1 meas. / 5 min). Unlimited working time via USB connection (PC-software WinControl-3 – no sleep mode)

Inputs
  • Two BNC-connectors for the connection of two PAR-sensors with individual calibration factors between -50.0 and -9999.9 (memory for 10 calibration factors), range switchable in 5 steps 250 nA to 0.6 mA
  • Connector for Monitoring Leaf-Clip JUNIOR-B; an adapter is available for the connection of the Leaf-Clip Holder 2030-B, and the Micro Quantum/Temp.-Sensor 2060-M
  • Connector for additional digital sensors (still under development)
  • USB-Connector for connection with computer (software: WinControl-3)
Memory

Flash memory used as ring buffer for 50000 lines (1 line / single measurement)

Display

White illuminated graphic display with 5 different display modes (1: all data; 2-4: two selected sensors in big letters; 5: chart mode for channel no. 1, with maximum, minimum and average indicated), resolution: 0.1 μmol m-2 s-1

Computer Connection

1 free USB socket. Processor, 1 GHz. RAM, 256 MB. Hard disc space, 20 MB. Screen resolution: 800 x 600 pixels. Interface, USB 1.1, 2.0 and 3.0. Operating system: Microsoft Windows 10 and 11.

Design of sensor

Small versatile waterproof mini quantum sensor for selective PAR measurement, cosine corrected for light incident at an angle between -30 ° to +30 ° from surface normal for PPFD (photosynthetical photon flux density) measurement, with base plate for screw connection.

Sensor housing

Black resin material

Diffuser material

Perspex

Signal detection

High stability silicone photovoltaic detector with filter set for PAR correction (see “General Features” for typical response)

Signal output
Typically 10 μA / (1000 μmol m-2 s-1)
Temperature coefficient of photodiode

0.01 %/K

Absolute calibration
± 10 %
Immersion coefficient
Typically 1.15
Angular dependence
Error < 3 % for angle between -30 ° and +30 ° from normal axis (see chart for typical response)
Design of sensor
Microscopy quantum sensor for PPFD (photosynthetical photon flux density) measurement.
Operating temperature
- 5 °C … + 45 °C
Cable length
3 m
Connector

BNC

Size

Base plate: 12 mm x 7 mm x 1 mm (H x W x L)
Sensor housing 5 mm x 7.5 mm x 7 mm (H x W x L)
Diffuser diameter: 3 mm

Weight

26 g

Design of sensor

Microscopy quantum sensor for PPFD (photosynthetical photon flux density) measurement.

Sensor housing

Black anodized aluminum housing

Diffuser material

Resin with fluorescence dye

Signal detection

High stability silicon photovoltaic. Signal output typically 1.5 μA / (1000 μmol m-2 s-1)

Temperature coefficient of photodiode

0.01 %/K

Absolute calibration

± 5 %

Operating temperature

0 °C … + 40 °C

Cable length

55 cm

Connector

BNC

Power supply

Not required

Size

Height: 5.5 mm
Length: 76 mm
Width: 26 mm
Diffuser diameter: 0.2 mm

Weight
36 g
Application

Measurement of photosynthetic photon fluence rate in air or water

Connects to

E.g. ULM-500

Connector

BNC

Signal output

Typically -3.5 μA / (1000 μmol m-2 s-1) in air

Cable length
3 m
Size

Diameter: 1 cm

Length: 11 cm

Weight

62 g