Data logger for Humidity and Temperature
We congratulate you on the purchase of your new ROTRONIC HygroLog HL20/21 data logger.
Please read these short instructions carefully before installing the device. When handled with
care, it will serve you for many years.
When used in combination with HW4 software, the loggers are
FDA CFR 21/1
and
GAMP4
compliant.
These short instructions are limited to a description of the main functions and installation
of the device. The detailed instruction manual can be found on the internet at:
www.rotronic-humidity.com
General Description
The HygroLog HL20 data logger can record up to 20000 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 20000 temperature values within the range
of -10 to 60 °C (14 to 140 °F).
Models with the optional LC display are limited 0 to 50 °C (32 to 122 °F).
Dimensions / Connections
Service and data connector (AC3006)
SHoRT inSTRuCTion MAnuAl
Battery type
3 x AA (1.5 V) alkaline
Low battery indication
Yes (with HW4 software or with optional display)
Measuring range
0…100 %rh / -10...60 °C
Measurement accuracy at 23 °C
±0.8 %rh / ±0.2 °C
Repeatability
0.3 %rh / 0.05 °C
Long term stability
<1 %rh / year / <0.1 °C / year
Psychrometric calculations
Dew or frost point (user configurable setting)
Start-up time
1.9s (typical)
Data refresh rate
1.7s (typical)
Recording capacity
HL20: 20000 value pairs (%rh + °C)
HL21: 20000 values (°C)
Real time clock
Yes, adjustable via PC
Log interval
Min. 5 sec. up to1 hour in 5 sec. increments
Optional display
LC, 1 or 2 decimals resolution, backlight, alarm and
low battery indication
LED indicator
5 sec, green flash when recording data
5 sec. red flash for out-of-limit value or logger problem
Housing protection grade
HL20: IP 40, HL21: IP65
Weight
About 210 g (7.4 oz)
FDA / GAMP directives
Compatible
Operating limits
-10…60 °C (models w/o display)
0…50 °C (models with display)
0…100 %rh, non condensing
Overall dimensions
130 x 72 x 32 mm (5.1 x 2.8 x 1.3”)
Fig.1
insert or Replace Battery
The ROTRONIC HygroLog HL20/21 data logger operates with 3 x AA 1.5 V alkaline batteries.
In order to insert or change the battery, loose the screw from the back panel. Afterwards remove
the back cover and the battery compartment is accessible.
Mechanical installation / General recommendations
Relative humidity is extremely temperature-dependent. In order to measure it exactly, the device
must be set exactly on the temperature level of the environment that is to be measured. The
installation site can therefore have a significant influence on the performance of the instrument.
Follow the guidelines below to ensure optimum performance:
a) Select a representative installation site: Install the probe at a point where the humidity, tempe-
rature and pressure conditions are representative for the environment that is to be measured.
b) Make sure there is sufficient air movement around the device: An air flow of at least 1 meter/
second accelerates and facilitates adjustment of the probe to changing temperatures.
c) Avoid: (1) Device too close to heating elements, cooling coils, cold or hot walls, direct sunlight,
etc. (2) Device too close to steam, injectors, humidifiers or direct precipitation. (3) Unstable
pressure conditions with high air turbulence. (4) Avoid accumulation of condensation at the
contact wires of the sensor.
Mounting the Hygrolog Hl20/21
The device can be either mounted to a wall with the delivered screw or placed with the small
desk stand (Fig.1).
Mounting to a wall: Drill the necessary hole and insert the plug delivered with the device. Turn
the screw into the wall, so that the screw head has a distance of about 2-3 mm (1/8”) from the
wall to hang the logger to the screw.
optional Display
To view the measured or calculated data, press briefly on the function key. When the display
sleep function is not enabled, the display can be manually turned off by pressing briefly on the
function key.
To conserve battery power, models with a display are shipped with the Display Sleep function
enabled (set to 1 minute) and with the display backlight disabled. When configured in this manner
the data logger can record data for extended periods of time.
Data logging
To start or stop recording data, press on this key for a few seconds. When the data logger
is recording data, this is indicated by the display message bar and by the LED indicator
flashes green every 5 seconds. When the display sleep function is enabled, the display
goes blank after some time in order to conserve battery power.
Data recording modes
Loop: when the memory is full the logger dumps the oldest data sample and keeps recording. The
memory retains the most recent data.
Start-Stop: the logger stops recording data as soon as the memory is full
Displaying recorded Data
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. One end of the cable plugs into the service / data con-
nector (Fig.1). The other end plugs into the USB of a PC with the ROTRONIC HW4 software installed.
Technical Data
12
.0
81
3.
00
01
ROTRONIC AG
, CH-8303 Bassersdorf
Tel. +41 44 838 11 44, www.rotronic-humidity.com
ROTRONIC Messgeräte GmbH
, D-76275 Ettlingen
Tel. +49 7243 383 250, Fax +49 7243 383 260, www.rotronic.de
ROTRONIC SARL
, 56, F - 77183 Croissy Beaubourg
Tél. +33 1 60 95 07 10, www.rotronic.fr
ROTRONIC Italia srl
,
I- 20157 Milano
Tel. +39 2 39 00 71 90, Fax (+39) 02 33 27 62 99, www.rotronic.it
ROTRONIC Instruments (UK) Ltd
, Crompton Fields,
Phone +44 1293 571000, www.rotronic.co.uk
ROTRONIC Instrument Corp
, NY 11788, USA
Phone +1 631 427-3898, www.rotronic-usa.com
ROTRONIC South East Asia Pte Ltd,
Singapore 339156
Phone +65 6294 6065, www.rotronic.com.sg
ROTRONIC Shanghai Rep. Office
, Shanghai 200233, China
Phone +86 40 08162018, www.rotronic.cn
130 mm
32 mm
72
m
m
