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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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Description

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.

Specifications

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

Application

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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