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5-year battery life
USB, serial ports
1 second - 12 hours intervals
Rugged aluminum enclosure
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2-channel relative humidity and temperature data logger.

SITE-LOG LRHT-1 ( internal sensor )/LRHT-2 ( external sensor probe, 3 ft ) is a 2-channel, battery powered, stand-alone data logger, with storage up to 4 MB of data in non-volatile flash memory. Its aluminum enclosure makes it excellent in the harshest industrial environment.

Plug & Play USB port and versatile custom equation simplify communications and engineering unit conversion. Powered by Sensirion high performance digital RH sensor, the LRHT-1/LRHT-2 logger is well suited for science and laboratory applications where precise and accurate measurements are critical.

Simply plug the logger to computer's USB port, and the software automatically recognizes it and handles the configuration, downloading, graph viewing and more...

  • 4 megabyte memory size
  • Both USB and serial interfaces with auto baud rate of up to 115200 bps
  • Sensirion RH Digital Sensor
  • Powerful software for configuration, downloading, plotting, analysis and alarm reporting
  • Configurable alarm controls/excitation controls
  • Wide sampling interval selections (from 1 second to 12 hours)
  • Rugged aluminum enclosure
  • Coated PCB to protect against moisture, corrosion and mildew.
Logger Memory Capacity
Sampling Interval Enabled Channel Logging Capacity
1 minute 1 3.98 years
1 minute 2 727 days
1 minute 8 181 days
10 seconds 1 242 days
10 seconds 2 121 days
10 seconds 8 30 days
1 second 1 24 days
1 second 2 12 days
1 second 8 3 days
2-channel relative humidity and temperature data logger
Product Name:
For internal sensor: LRHT-1
For external sensor probe: LRHT-2
Relative humidity (0 ~ 100% RH)
Temperature (-40°C ~ 70°C, -40°F ~ 158°F)
Temperature channel: 12-bit
RH channel: 12-bit
Temperature:+/- 0.4°C at 25°C
Relative humidity channels: +/-3% (20% - 80% RH)
Sensor Probe (for LRHT-2):
3 feet long, terminal block connector
Channel Alarms:
Two editable alarm thresholds per channel
Alarm Output:
With purchase of SiteView software, SITE-LOG can report alarm status to host PC via USB, Modem or Ethernet Device Server.
Alarm-On Delay:
programmable 0 - 10 minutes delay with 1-minute increment.
Alarm Indicator:
On-board LED lights in red when in alarm condition.
On-board Memory:
4 Mega bytes (2MB readings)
Data Retention:
Over 20 years
Sampling Interval:
1 second to 12 hours user selectable
Logging Mode:
Stop recording or FIFO when memory is full
Logging Activation:
Programmable instant, start delay or field push button activation.
USB (Mini-USB-B) (USB-A-mini USB-B Cable included)
AUX(RJ11) for direct TTL level communications
With purchase of DeviceServer SITE-LOG can be connected to Ethernet for remote access.
Baud Rate:
Auto-detect baud rate from 2400 to 115200 bps on both USB and AUX.
Built-in 3.6V Lithium Battery.
Battery Life:
5 years based on 1 minute sampling interval.
SiteView: (Sold separately)
Configuration, downloading, plotting, real-time view, custom calibration and custom equation.
Software Requirements:
Computer with 1.0 GHz or faster processor
256 MB Memory or higher
1.0 GB of available hard-drive space or higher
Windows XP with SP2 or later, Vista, Window 7
At least one USB port or one COM port.
Aluminum enclosure.
PCB Treatment:
Conformal coating.
88 X 64.2 X 24 mm (3.46 X 2.53 X 0.95 inches).
Probe/wall-mount holes for hanging/mounting.
LED Indicator
Tri-Color LED: (can be disabled for power saving)
Normal Sampling: green when sampling.
Alarm: red when sampling.
Low Battery: amber when sampling.
Operating Environment:
-40 ~ +70 °C (-40 °F ~ 158 °F), 0 ~ 95% RH non-condensing.
Clock Accuracy:
+/- 1 mintue per month.
LRHT-1 with internal relative humidity and temperature sensor LRHT-2 with external relative humidity and temperature sensor Carrying Case SiteView Software Overview Real-Time Strip Chart Graph & Tabular Views Logger Status Window

Model Description Buy
LRHT-1 SITE-LOG 2-Channel RH & Temperature Data Logger (Int Sensor)
LRHT-2 SITE-LOG 2-Channel RH & Temperature Data Logger (Ext Sensor)