IN-E-HL20-V1_16
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroLog HL20 and HL21 data logger:
User Guide
Instruction Manual
Document Type
Page
7
of 23
Document title
2.5 Memory
All models use a non-volatile EEPROM internal memory to hold the measurement data. The
memory cannot be removed from the data logger.
Memory capacity is as follows:
HL20: 20,000 pairs of relative humidity and temperature values
HL21: 20,000 temperature values
2.6 Function key
The function key is used as follows:
o
Long key press: press the key for a few seconds to start or stop data logging.
o
Short key press: depending on the configuration settings of the display (display sleep
function) a short key press turns on and off the optional LC display.
For more details, see “Operation”
2.7 Status indicator (LED)
The status indicator consists of a green and red LED. The green side of the LED flashes every 5
seconds when logging is active. The red side of the LED flashes every 5 seconds when a measured
value is out of limits (see “Configurable settings”) or when the logger requires attention (low battery,
memory full, major sensor failure – such as open or shorted sensor)
2.8 Service and data connector
The service / data connector (mini-USB type) can be accessed after removing the back cover (see
Operation). The connector gives access to the data logger UART digital interface (Universal
Asynchronous Receiver Transmitter).
Configuring the data logger or retrieving the recorded data requires cable AC3006 or equivalent.
One end of the cable plugs into the service / data connector. The other end plugs into the USB of
a PC with the ROTRONIC HW4 software installed. See “Initial start-up” for the location of the
service / data connector.
© 2015; Rotronic AG
IN-E-HL20-V1_16
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