ULM-500 Universal Light Meter and Data Logger (Heinz Walz GmbH, Germany)

Brand: Heinz Walz GmbH
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ULM-500 Universal Light Meter and Data Logger (Heinz Walz GmbH, Germany)

Brand: Heinz Walz GmbH

Product Code: ULM500

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Specifications: (see all)

Measured / controlled parameters

Light intensity, photosynthetically active radiation (PAR, 400–700 nm), pulsed illumination, leaf temperature (with JUNIOR-B clip), time and date of measurement.

Measurement / analysis range

0.1 – 99 999 µmol m⁻² s⁻¹ (five sensitivity ranges).

Measurement accuracy / precision

± 3 % of reading (within 10–10 000 µmol m⁻² s⁻¹ range).

Analysis method / operating principle

Quantum photometer based on silicon photodiode with 400–700 nm filter; pulse integration and time-averaging measurement.

Analysis / measurement time

From 0.1 s to 60 min (adjustable logging interval).

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The ULM-500 Universal Light Meter and Data Logger by Heinz Walz GmbH (Germany) is a compact, high-precision instrument for measuring and recording light intensity and photosynthetically active radiation (PAR, 400–700 nm).

It features two BNC inputs for connection of PAR or pyranometer sensors (MQS-B, LS-C, US-SQS/L) and an additional connector for the JUNIOR-B Leaf Clip or 2030-B adapter, allowing measurement of both light and leaf temperature.

With its five sensitivity ranges (0.1–99 999 µmol m⁻² s⁻¹) and high dynamic response, the ULM-500 can resolve both low laboratory light levels and fast saturating light pulses from PAM fluorometers. Internal flash memory stores up to 50 000 records, while “sleep mode” enables up to 100 days autonomous logging.

Using WinControl-3 software, users can configure measurement intervals, automatically log data, and export results to spreadsheets. The back-lit LCD display ensures visibility in dark environments. Powered by four AAA batteries or USB (5 V DC), weighing just 210 g, the instrument combines mobility with precision.

The ULM-500 is the ideal solution for photosynthesis research, environmental light monitoring, calibration of illumination systems, and long-term PAR measurements in the field or laboratory.

Tags: Soil and plant analysis

Soil and plant analysis

Measured / controlled parameters

Light intensity, photosynthetically active radiation (PAR, 400–700 nm), pulsed illumination, leaf temperature (with JUNIOR-B clip), time and date of measurement.

Measurement / analysis range

0.1 – 99 999 µmol m⁻² s⁻¹ (five sensitivity ranges).

Measurement accuracy / precision

± 3 % of reading (within 10–10 000 µmol m⁻² s⁻¹ range).

Analysis method / operating principle

Quantum photometer based on silicon photodiode with 400–700 nm filter; pulse integration and time-averaging measurement.

Analysis / measurement time

From 0.1 s to 60 min (adjustable logging interval).

Sample volume / sample volume range

—

Applicable media

Laboratory, greenhouse and field environments; natural and artificial light.

Sensor / electrode / probe / indicator type

Connectable PAR sensors (MQS-B, LS-C, US-SQS/L) via BNC inputs; JUNIOR-B leaf clip or 2030-B adapter.

Number of channels / measurement points

2 BNC inputs + 1 accessory port (total 3 channels).

Temperature compensation

Automatic sensor sensitivity compensation via built-in temperature sensor.

Number of calibration points / calibration method

Factory calibration by Heinz Walz GmbH; user check via standard light source.

Housing / chamber / tip material

Anodized aluminum housing with rubber seals; splash-proof connectors.

Design and features

Compact housing with back-lit graphical display; suitable for bench-top or portable use; integrated control keys.

Lighting / climate control system

Not applicable; measures external light sources.

Number of programmable cycles / automatic modes

Up to 50 000 logging cycles; automatic “Sleep” mode with timer wake-up.

Interfaces and outputs

2 BNC ports, USB-mini B, DC 5 V power connector.

Software / PC compatibility

Compatible with WinControl-3 software (Heinz Walz); supports real-time plotting and data export.

Memory / data storage functions

Internal memory 50 000 records; storage in WinControl or TXT format.

Operating conditions

Temperature 0…+50 °C; humidity up to 90 % non-condensing.

Power supply

4 AAA batteries (1.5 V) or USB 5 V from adapter/PC.

Battery life

Up to 100 days in sleep mode or 20 hours of continuous operation.

Dimensions

17 × 8 × 3 cm.

Weight

Approx. 210 g (without sensor).

Scope of supply

ULM-500 main unit, USB cable, 4 AAA batteries, protective case, user manual; optional MQS-B or LS-C sensor.

Certificates and compliance with standards

CE; ISO 9001; GLP and RoHS compliant.

Country of origin

Germany

Storage conditions

Store in a dry place at +5…+40 °C, protected from dust and moisture.

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