Hand-held read-out unit / datalogger

LI19 is a high accuracy handheld read-out unit / datalogger. It is used to make mobile measurements, for short term datalogging (as a static logger), and as an accurate millivolt amplifier directly connected to a PC. LI19 can be used with a variety of sensors. LI19’s most common application is with heat flux- and  solar radiation sensors. LI19 battery life and memory allow continuous measurement for up to 50 days.

  • High accuracy handheld read-out unit / datalogger
  • Easy transport and protection during field measurement campaigns
  • Supplied in a practical transport case
  • Fresh batteries allow more than 50 days of operation


LI19 May be Used with Pyranometers and Heat Flux Sensors
LI19 is typically used to display the measured solar radiation or heat flux. It measures a DC voltage. Once programmed with the sensitivity of the connected sensor, the display will show the actual value of the heat flux or solar radiation in W/m². LI19 is programmed through its PC user interface. We recommend downloading the latest software. LI19 is battery powered, using 2 x AA-type batteries. Fresh batteries allow more than 50 days of operation. The system is supplied in a practical transport case, for easy transport and protection during field measurement campaigns. LI19 is built for easy use with a large size LCD, displaying quantities in W/m², and a USB connection. LI19 may be used with pyranometers and heat flux sensors.

Suggested Use

  • Short-term field measurement of solar radiation or heat flux
  • Amplification of heat flux sensor signals
  • Education in solar energy

Areas of Application

  • Industrial monitoring and control / heat flux and heat transfer measurement
  • Solar energy / PV system performance monitoring


Output on display

Heat flux, solar radiation


analogue voltage


Division by the sensor sensitivity

Display definition

4 digits with sign

Display refreshment rate

1 s⁻¹

Calibration uncertainty

0.1 %

Temperature dependence

< 0.5 % + 3 x 10⁻⁶ V over rated range

Sample rate

2 s⁻¹

Rated input range

6.25 to 200 x 10⁻³ V (selectable)

A/D conversion

16 bits

Stored measurement definition

minimum maximum and average over storage interval with conversion to W/m²

Storage capacity

3518 measurements

Storage interval range

2 to 65535 s (selectable)

Compatibility with Hukseflux sensor models

LP02, HFP01, SBG01, HF03

Battery type

2 x AA

Internal power supply voltage


Battery life

> 50 days (on fresh batteries)

Rated operating temperature range

-10 to +40 °C

System requirements for use with PC

Windows XP and higher

Connection to PC

USB 1.1 / 2.0 low speed

User interface on PC

LI19 software

IP protection class


Connection to sensor

2 x (female chassis plug for 4 mm banana with screwed signal wire clamp)


0.175 kg (net) / 1.3 kg with carrying case

Dimensions LI19

(70 x 146 x 25) mm

Dimensions transport case

(400 x 300 x 120) mm


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Download Product Manual

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