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
18
of 23
Document title
5.
Technical data
5.1 Specifications
General
HL20 / HL21
Device type
Humidity-temperature data logger with internal sensor(s)
Battery type
3 x AA (1.5 V) alkaline
Battery life time
Depends on log interval and other settings. Examples based on a 30
minutes log interval:
-
Models w/o LC display: 20 months
-
Models with LC display, display sleep function set to 1 minute: 13
months
Low battery indication
Yes (with HW4 software or with optional display)
Humidity measurement
HL20
Sensor
ROTRONIC Hygromer
®
IN1
Measuring range
0…100 %RH
Measurement accuracy at 23 °C
±1.3 %RH @ 0…10 %RH
±0.8 %RH @ 10…60 %RH
±1.3 %RH @ 60…100 %RH
Repeatability
0.3 %RH
Long term stability
< 1 %RH / year
Response time
Typical 3 min. (depends on air flow)
Temperature measurement
HL20 / HL21
Sensor
Pt100 RTD, IEC 751 class A
Measuring range
-10...60°C
Measurement accuracy at 23 °C
±0.3 °C
Repeatability
0.05°C
Long term stability
< 0.1°C / year
Response time
Typical 10 min. (depends on air flow)
Calculated parameters
HL20
Psychrometric calculations
Dew or frost point (user configurable setting)
Start-up time and data refresh rate
HL20 / HL21
Start-up time
1.9s (typical)
Data refresh rate
1.7s (typical)
Data recording and download
HL20 / HL21
Recorded parameter(s)
HL20: relative humidity and temperature, HL21: temperature
Recording media
Internal EEPROM non volatile, not removable
Recording capacity
HL20: 20,000 value pairs, HL21: 20,000 values
Real time clock
Integrated, accuracy 2 s/year
Logging modes
Start-stop (recording stops when memory is full
Loop: oldest data is dumped to make room for latest data
Log interval
Min. 5 sec, up to1 hour in 5 sec. increments
Interface for data download
Internal connector, located under protective cover
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IN-E-HL20-V1_16
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