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LI19 datalogger

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.

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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.


output on display heat flux, solar radiation
Input analogue voltage
Conversion 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 SR05-A1, HFP01, SBG01, HF03
Battery type 2 x AA
Internal power supply voltage 3 VDC
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 IP40
Connection to sensor 2 x (female chassis plug for 4 mm banana with screwed signal wire clamp)
Weight 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


Suggested use

  • short-term field measurement of solar radiation or heat flux
  • amplification of heat flux sensor signals
  • education in solar energy
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