VersaLog VL-RTD-1

  • 16-bit Analog-to-Digital Converter
  • 8 MB Memory Size
  • 1 On-Board Thermistor Channel
  • 4 RTD Input Channels
  • USB, Serial and Optional Ethernet Interface Capabilities
  • 10-year Battery Life
  • Alarm Output
  • SiteView software required (1 license per site) and sold separately


Additional Equipment Required


The VersaLog VL-RTD-1 RTD Data Logger is a 4-channel, battery powered, stand-alone temperature data logger.  It records the ambient temperature with a built-in thermistor and has four external 2 or 3 wire RTD inputs plus alarm output capabilities. Data is stored in 8 MB of non-volatile flash memory for later retrieval.

The VL-RTD-1 is a high accuracy device, it’s 4 external RTD channels offer an accuracy of +/-0.16°C @ 25°C. It accepts standard 2 or 3 wire PT-100 RTD probes that have a resistance value of 100 ohms at 25°C. It is powered by a 16-bit ADC, and is well suited to science and laboratory applications where precise and accurate measurement is critical.

The VL-RTD-1 RTD data logger features an aluminum enclosure and provides excellent performance in the harshest industrial environments. It has both USB and serial interfaces and can connect to Ethernet networks using the optional DSS-2 device server.  The VL-RTD-1 is powered by an internal non-rechargeable lithium battery with up to a 10-year life.


ConnectionsPluggable terminal block for four external channels, excitation controls and alarm outputs
ChannelsOn-board ambient thermistor temperature sensor (-40°C ~ 70°C). Four external RTD channels for 2 or 3 wire PT100, 100 ohm RTD’s, measurement range 20 ~ 400 ohms (-200°C ~ 850°C) Alpha .00385 & .00392 curves.
Resolution0.0018%, 0.02°C
AccuracyInternal thermistor channel: +/- 0.2°C (0°C ~ 70°C) External RTD channels: +/- 0.015% FSR @ 25°C, +/-0.16°C @ 25°C
Channel AlarmsTwo editable alarm thresholds per channel
Alarm OutputsALARM1 & A2/EXT 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
Can report alarm status to host PC via USB, Modem or Ethernet Device Server with SiteView software[2]
Alarm-On DelayProgrammable 0 – 10 minutes delay with 1-minute increments
Alarm IndicatorOn-board LED lights in red when in alarm condition
On-Board Memory
Capacity8MB ~ 4 million measurements
Data RetentionOver 20 years
Sampling & Logging
Sampling interval20 milliseconds[1] to 12 hours user selectable
Logging ModeStop recording or FIFO when memory is full
Logging ActivationProgrammable instant, start delay or field push-button activation
InterfaceUSB (USB cable included), AUX (RJ11) for direct TTL level communications
Can be connected to Ethernet for remote access with DeviceServer Kit[2]
Baud RateAuto-detect baud rate from 2400 to 115200 bps on both USB and AUX ports
PowerBuilt-in 3.6V Lithium Battery
Life Cycle10 years based on 1 minute sampling interval
SiteViewConfiguration, downloading, plotting, real-time view, custom calibration and custom equatio
Software RequirementsComputer 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, Windows 7, 8, 10
At least one USB port or one COM port
LED IndicatorNormal Sampling: green when sampling
Alarm: red when sampling
ow Battery: amber when sampling
Exitation ControlA2/EXT terminal strip can be configured as excitation control output for powering connected devices
Warm-up delay Interval settings: 10 to 240 seconds with 10-second increments
Operating Environment-40 ~ +70°C (-40°F ~ 158°F), 0~95%RH non-condensing
Clock Accuracy+/- 1 minute per month
ApprovalsCE, FCC


Siteview Software

VersaLog SiteView Software

SiteView is a Windows-based application which works with the VersaLog Series data loggers for downloading, configuration, data analyzing and plotting. Its user-friendly graphic interface plus powerful functionalities fit both novice and advanced users.

The versatility of custom equation and custom-line equation handles complicated measurement requirements.

  • Supports USB, Serial port and Ethernet connections for easy local and remote access
  • Fast communication speed up to 115200 bps makes downloading fast
  • Real-time viewing and graphs replace obsolete paper chart recorders
  • Custom equation and custom-line equation solves scientific and laboratory algorithm difficulties
  • Zoom in/zoom out, annotation/label of graph functions provide detailed view of data • Multiple file loading allows easy data comparison
  • Dynamic statistics provide detailed information of current zoomed view