General

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:

•HL20D with display sleep function set to 1 minute: 13 months

Low battery indication

Yes (with HygroSoft software or with optional display)

Humidity measurement

Sensor

ROTRONIC Hygromer ® IN-1

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

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

Psychrometric Parameters

Dew point (Dp) or Frost point (Fp)

Startup Time and Data Refresh Rate

Startup time

1.9s (typical)

Data refresh rate

1.7s (typical)

Data recording and download

Recorded parameter(s)

Relative humidity and temperature

Recording media

Internal EEPROM non volatile, not removable

Recording capacity

20,000 value pairs

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

Service and data connector

Interface type

UART (Universal Asynchronous Receiver Transmitter)

Maximum service cable length

5 m (16.4 ft)

General specifications

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 material

ABS

Housing protection grade

IP40

Overall dimensions

130 x 72 x 32 mm (5.1 x 2.8 x 1.3”)

Weight

About 210 g (7.4 oz)

Environmental limits

Operating limits

0….50 °C

0…100 %RH, non condensing

Critical environments

Humidity sensor: IN-1