Rotronic HygroLog HL20 Operating Manual
IN-E-HL20-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroLog HL20 and HL21 data logger:
User Guide
Document title
HygroLog HL20 and HL21 Data Logger
User Guide
Instruction Manual
Document Type
Page
1 of 17
© 2010; Rotronic AG IN-E-HL20-V1_10
IN-E-HL20-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroLog HL20 and HL21 data logger:
User Guide
Document title
Instruction Manual
Document Type
Page
2 of 17
Table of contents:
Overview .................................................................................................................................. 3
1.
General ................................................................................................................................ 3
1.1
General description ................................................................................................................ 4
2.
Models ................................................................................................................................. 4
2.1
Required accessories .......................................................................................................... 4
2.2
Batteries ............................................................................................................................... 4
2.3
Real time clock .................................................................................................................... 5
2.4
Memory ................................................................................................................................ 5
2.5
Function key ........................................................................................................................ 5
2.6
Status indicator (LED) .......................................................................................................... 5
2.7
Service and data connector ................................................................................................. 6
2.8
Optional display ................................................................................................................... 6
2.9
Operating limits .................................................................................................................... 6
2.10
Configurable settings ........................................................................................................... 6
2.11
Factory default settings ....................................................................................................... 8
2.12
Data logging ......................................................................................................................... 8
2.13
Operation ................................................................................................................................. 9
3.
Front panel with optional display ......................................................................................... 9
3.1
3.2 Initial start-up ..................................................................................................................... 10
Recording and displaying data (models without display) .................................................. 12
3.3
Displaying and recording data (models with display) ........................................................ 12
3.4
Practical advice for measuring temperature and humidity ................................................ 13
3.5
Maintenance .......................................................................................................................... 13
4.
Periodic calibration check .................................................................................................. 13
4.1
Firmware updates .............................................................................................................. 14
4.2
Technical data ...................................................................................................................... 14
5.
Specifications ..................................................................................................................... 14
5.1
Dew point accuracy ........................................................................................................... 16
5.2
Accessories .......................................................................................................................... 16
6.
Supporting documents ........................................................................................................ 17
7.
Document releases .............................................................................................................. 17
8.
© 2010; Rotronic AG IN-E-HL20-V1_10
IN-E-HL20-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroLog HL20 and HL21 data logger:
User Guide
Document title
Instruction Manual
Document Type
Page
3 of 17
Applicability:
This manual is valid for instruments with firmware version 1.0x (check using the ROTRONIC HW4
software, Device Manager). Examples: 1.0a, 1.0b. Changes in the last character of the version
number reflect minor changes in the internal software of the instrument that do not affect the
manner in which the instrument should be operated.
1. Overview
1.1 General
The HygroLog HL20 data logger can record up to 20,000 pairs of relative humidity and
temperature values within the range of 0 to 100 %RH and -10 to 60°C (14 to 140°F).
The HygroLog HL21 data logger can record up to 20,000 temperature values within the range of
-10 to 60°C (14 to 140°F ). Mode ls with the optional LC display are limited 0 to 50°C (32 to 122°F).
Temperature is measured with a Pt100 RTD. Relative humidity is measured with a ROTRONIC
Hygromer IN1 capacitive sensor. Both sensors are internal and there is no apparent probe.
Both the HL20 and HL21 require three AA batteries (1.5V) for power. Depending on both the log
interval and the display option, these data loggers can record data over a time period of up to 20
months without replacing the batteries.
Configuration of the HL20 and HL21, as well a s the downloading and viewing of recorded data,
requires a PC with the ROTRONIC HW4 software installed as well as a service cable such as the
AC3006
Based on the ROTRONIC AirChip 3000 digital technology the HL20 and HL21 offer the following
features:
• Unit system: metric or English
• Real time clock (runs for up to 4 hours without the 3 AA batteries after initial charge)
• Calculation of the dew or frost point (calc ula ted par ameter can be displayed but not recorde d)
• Optional LC display (%RH, temperature) with battery charge indicator and message bar
• Function key: starts and stops data logging, turns optional LC display on and off
• Status indicator (LED): flashes green when logging, flashes red for out-of-limit values or a
logger problem
• Humidity temperature calibration and adjustment
• Simulator mode (used to validate the data recording function)
The ability for the user to easily update the AirChip 3000 firmware means that the HP21 can be
kept up-to-date regarding any future functionality improvement.
Note: Instructions for using the HW4 software are not included in this manual. These instructions
are shipped separately on the software CD ROM.
© 2010; Rotronic AG IN-E-HL20-V1_10
IN-E-HL20-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroLog HL20 and HL21 data logger:
User Guide
Document title
Instruction Manual
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2. General description
2.1 Models
Basic models without display
o HygroLog HL-20: relative humidity and temperature logger, function key, status indicator
(LED), internal sensors protected by a slotted cover.
o HygroLog HL-21: temperature data logger, function key, status indicator (LED), internal
Pt100 RTD
Models with display
o HygroLog HL-20D: same as HL20, LC display with backlight, message bar and battery
charge indicator
o HygroLog HL-21D: same as HL21, LC display with backlight, message bar and battery
charge indicator
2.2 Required accessories
The following accessories are required in order to be able to configure the logger and to
download and view the recorded data:
- Cable AC3006 or equivalent (plugs into a USB port of the PC)
- PC with the ROTRONIC HW4 software installed (version 2.4.0 or higher)
2.3 Batteries
All models ship wit h thr ee AA batt eries which must be inserted first (see battery replacement).
Note
: To conserve battery power, models w ith the LC displ a y are shipp ed with the Disp lay Sleep
function enabled and set to 1 minute (see Software Functions). When the function key has not
been pressed for some time (in this case 1 minute), the display sleep function automatically turns
the display off. The display can be temporarily turned on at any time by pressing on the function
key.
2.3.1 Battery lifetime
The battery lifetime depends on the manner in which the HL20 or HL21 is being used. The
following examples are based on the following assumptions:
● Fresh set of AA batteries (2900 mAh)
● Display backlight turned off (if applicable)
● Log interval set to 30 minutes
© 2010; Rotronic AG IN-E-HL20-V1_10
IN-E-HL20-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroLog HL20 and HL21 data logger:
User Guide
Document title
Models w/o LC display 20
Models with LC displ ay, display sleep function set to 1 minute 13
Models with LC display, display sleep function disabled 5
Battery lifetime in months
Instruction Manual
Document Type
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5 of 17
2.4 Real time clock
After inserting a fresh set of batteries for the first time, the real time clock must be adjusted prior
to using the HL20 or HL21 (s ee “Operation”). The real time clock is powered from a large
capacitor and can run for up to 4 hours without the batteries. R emoving the battery for an
extended period of time will cause the logger to completely lose track of the date and time.
Because of the requirement to always keep track of the date and time, the HL20 and HL21 do not
have a power on/off switch.
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:
• Long key press: press the key for a few seconds to start or stop data logging.
• 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)
© 2010; Rotronic AG IN-E-HL20-V1_10
IN-E-HL20-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroLog HL20 and HL21 data logger:
User Guide
Document title
Instruction Manual
Document Type
Page
6 of 17
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.
2.9 Optional display
The optional LC display has a backlight which can be enabled or disabled when configuring the
data logger.
o HL20D: depending on the configuration of the logger, the LC display shows relative humidity
and temperature or the dew / frost point and temperature. The top line displays humidity
(%RH or the dew / frost point)
o HL21D: the LC display shows temperature.
The LC display can be configured to show the measured or calculated values with either one or
two decimals.
Note
: the LC display is automatically turned on when the data logger is connected to the USB
port of a PC by means of cable AC3006 or equivalent.
2.10 Operating limits
Models without display:
● -10…60°C with the factory supplied alkaline batteries
● 0…100 %RH, non condensing
Models with display:
● 0…50°C with the factory supplied alkaline batteries
● 0…100 %RH, non condensing
2.11 Configurable se ttings
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 / dat a connector to a USB port of the PC.
© 2010; Rotronic AG IN-E-HL20-V1_10
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