LRTD SITE-LOG Resistance Temperature Detector Data Logger

LRTD SITE-LOG Resistance Temperature Detector Data Logger

The SITE-LOG LRTD is a 4-channel, battery powered, standalone RTD data logger. The logger records the ambient temperature and four resistance temperature detectors (RTDs). Data is stored in 8MB non-volatile flash memory for later retrieval. Different models are available for PT100, PT500 and PT1000 sensor probes.

Its versatile equations simplify engineering unit conversion. Plug & Play USB port makes the communication easy and Its aluminum enclosure makes it excellent in the harshest industrial environment. 

16-bit ADC makes it 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... 


  • 16-bit analog-to-digital converter
  • 8 megabyte memory size
  • Built-in equations for TCR 0.00385 and 0.00392. Custom equations support any other special RTD sensors.
  • Both USB and serial interfaces with auto baud rate of up to 115200 bps
  • Over 10 years of battery life
  • Powerful software for configuration, downloading, plotting, analysis and alarm reporting
  • Configurable alarm control/excitation controls
  • Wide sampling interval selections (20 milliseconds to 12 hours)
  • Rugged aluminum enclosure
  • Coated PCB to protect against moisture, corrosion and mildew.
  • ration, downloading, plotting, analysis and alarm reporting
  • Configurable alarm control/excitation Controls
  • Wide sampling interval selections (20 milliseconds to 12 hours)
  • Rugged aluminum enclosure
  • Coated PCB to protect against moisture, corrosion and mildew.


SITE-LOG RTD Temperature Data Logger (LRTD)

SiteView Specifications


Want to remotely access this data logger? Check out DSS-2 Site USB Device Server

Product Name SITE-LOG Resistance Temperature Detector Data Logger
Model LRTD-1 (for PT100)
LRTD-2 (for PT500)
LRTD-3 (for PT1000)
Connection Plugable terminal block for four external channels, excitation controls and alarm outputs
Channels One on-board thermistor temperature (-40°C ~ 70°C, -40°F ~ 158°F)
Four external RTD channels:
PT100: 20 ~ 400 Ohms (-200 °C ~ 850°C)
PT500: 90 ~ 1600 Ohms (-200 °C ~ 630°C)
PT1000: 185 ~ 3200 Ohms (-200 °C ~ 630°C)
Built-in equations(TCR 0.00385 and TCR 0.00392)
Resolution 0.0018% (PT100: 0.02°C, PT500,1000: 0.015°C)
Accuracy Thermistor: ±0.2°C(0°C ~ 70°C, 32°F ~ 158°F) RTD Channels: ±0.015%
LRTD-1: ±0.16°C @25°C
LRTD-2: ±0.13°C @25°C
LRTD-3: ±0.13°C @25°C
Channel Alarms Two editable alarm thresholds per channel.
Alarm Output ALARM1 & A2/E terminal strips can be configured as alarm outputs.
Alarm-On: MOSFET(N-Channel) switch on
Alarm-Off: MOSFET(N-Channel) switch off
Max Power: 200mA @ 24VDC.
Alarm-On Delay Programmable 0 - 10 minutes delay with 1-minute increment.
Alarm Indicator On-board LED becomes red when in alarm condition.
On-board Memory
Size 8 Mega bytes (4MB readings).
Data Retention Over 20 years.
Sampling Interval 20 milliseconds to 12 hours programmable. (external power supply required if interval less than one second)
Logging Mode Stop recording or FIFO when memory is full.
Logging Activation Programmable instant, start delay or field push button activation.
Interface USB (Mini-USB-B) (USB-A-mini USB-B Cable included)
AUX(RJ11) for TTL level RS232 communications.
Baud Rate Auto-detect baud rate from 2400 to 115200 bps on both USB and AUX.
Power Built-in 3.6V Lithium Battery.
Battery Life 10 years based on 1 minute sampling interval.
SiteView (Sold separately) Configuration, downloading, plotting, real-time view, custom calibration and custom equation.
Software Requirement Computer with 1.0 GHz or faster processor
1 GB Memory or higher
10 GB of available hard-drive space or higher
Windows XP with SP2 or later, Vista, Window 7,8,10
At least one USB port or one COM port.
Material Aluminum enclosure.
PCB Treatment Conformal coating.
Dimension 88 X 64.2 X 24 mm (3.46 X 2.53 X 0.95 inches).
Weight 200g
Mounting Probe/wall-mount holes for hanging/mounting.
LED Indicator Tri-Color LED: (can be disabled for power saving)
Normal Sampling: light green when sampling.
Alarm: red when sampling.
Low Battery: amber when sampling.
Excitation Control A2/E terminal strip can be configured as excitation control output for driving the power of connected devices.
Warm-up delay interval settings: 10 to 240 seconds with 10-second increment.
Operating Environment -40 ~ +70 °C (-40 °F ~ 158 °F), 0 ~ 95% RH non-condensing.
Clock Accuracy ±1 mintue per month.
Approval CE, FCC

Logger Memory Capacity

Sampling Interval Enabled Channel Logging Capacity
1 minute 1 8 years
1 minute 2 4 years
1 minute 4 2 year
10 seconds 1 485 days
10 seconds 2 242 days
10 seconds 4 141 days
1 second 1 48 days
1 second 2 24 days
1 second 4 12 days
100 milliseconds 1 4 days 20 hours
100 milliseconds 2 2 days 10 hours
100 milliseconds 4 1 day 5 hours
  • $488.00(USD)

Available Options

Tags: LRTD, RTD data logger