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
9
of 23
Document title
2.11 Configurable settings
Configuration of the data logger by the user and access to its functions requires a PC with the
ROTRONIC HW4 software (version 2.4.0 or higher) installed. Service cable
AC3006 is used to
connect the service / data connector to a USB port of the PC.
Instructions regarding the configuration of the data logger and access to its functions are provided
in the following manuals:
E-M-HW4v3-F2-018
E-M-HW4v3-Main
(§ 7.5)
E-M-HW4v3-A2-001
2.11.1 Relative humidity symbol and temperature unit
Both the symbol representing relative humidity and the temperature can be configured to suit local
requirements.
2.11.2 Calculated parameter
HL20: the data logger can be set to compute one of the following psychrometric parameters.
o
Dew point (Dp)
o
Frost point (Fp)
Note:
o
When the optional display is configured to show the calculated parameter, either the symbol
Dp or the symbol Fp appear to the left of the numerical value, depending on whether the dew
point or frost point was selected. For values below freezing, the symbol Fp indicates that the
value is a frost point (above ice) as opposed to being a dew point (above liquid).
o
The data logger cannot be used to record either the dew point or the frost point
2.11.3 Alarm function (out-of-limit value)
The alarm function can be enabled or disabled for each of the measured or calculated parameters.
High and low value can be associated with each parameter so as to define out-of-limits values. A
hysteresis value can also be entered for each parameter. The hysteresis value is used for both the
low and the high alarm conditions.
The data logger has a red LED which flashes when the value of any parameter is out-of-limits. The
LED stops flashing when the value returns to normal.
Log files do not record the existence of an alarm condition. However, when the contents of a log
file are viewed as a data table with the HW4 software, values that correspond to an alarm condition
are printed over a red background, based on the alarm settings that HW4 downloaded from the
logger.
© 2015; Rotronic AG
IN-E-HL20-V1_16
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