VersaLog VL-TH

  • The 16-bit analog-to-digital converter meets most high-resolution requirements
  • The 4-Mega-Byte Memory stores up to 2 million measurements
  • One on-board thermistor channel monitors ambient temperature. Seven 10K thermistor input channels cover wide measurement requirements
  • Can be accessed via USB, MODEM, or Ethernet connections with auto baud rate of up to 115 kbps
  • Fast sampling mode
  • Alarm and excitation output
  • Siteview software required (1 license per site) and sold separately


Additional Equipment Required


VL-TH Thermistor Data Logger

The VL-TH Thermistor Data Logger is an 8-channel, battery powered, stand-alone thermistor data logger. The logger records up to 4 mega-byte of data and stores it in non-volatile flash memory for later retrieval. It accepts nearly any kind of thermistors that have the resistance value above 10K at 25°C.

Versalog data loggers feature aluminum enclosures which have excellent performance in the harshest industrial environments.

Powered by 16-bit ADC and programmable input range, the logger is well suited to science and laboratory applications where precise and accurate measurement is critical.

Siteview software required and sold separately. One license per site, can be used on multiple loggers.


Memory Capacity

All VersaLog data loggers come with 4MB on-board flash memory. The following table shows the relationship between number of enabled channels, sampling interval and max time span of logging.

Sampling IntervalNumber of ChannelsLogging Capacity
1 min13.98 years
1 min2727 days
1 min8181 days
10 sec1242 days
10 sec2121 days
10 sec830 days
1 sec124 days
1 sec212 days
1 sec83 days
100 milliseconds158 hours
100 milliseconds229 hours
100 milliseconds87.2 hours


ChannelsOn-board thermistor temperature (-40°C ~ 70°C, -40°F ~ 158°F), Seven
external thermistor channels for 10K thermistors
ConnectionsPluggable terminal block for seven external channels, excitation controls
and alarm outputs
AccuracyInternal thermistor channel: +/- 0.2°C (0°C ~ 70°C, 32°F ~ 158°F), External
thermistor channels: +/- 0.2% FSR @ 25°
Channel AlarmsTwo editable alarm thresholds per channel
Alarm OutputsALARM1 & A2/EXT terminal strips can be configured
as alarm outputsAlarm-On: MOSFET (N-Channel) switch on
Alarm-Off: MOSFET (N-Channel) switch offMax Power: 200mA @ 24VDC
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
Capacity4MB ~ 2 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
Baud RateAuto-detect baud rate from 2400 to 115200 bps on both USB and AUX
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 equation
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
At least one USB port or one COM port
MaterialAluminum enclosure
Dimensions88 X 64.2 X 24 mm (3.46 X 2.53 X 0.95 inches)
MountingProbe/wall mount holes for hanging / mounting
LED IndicatorNormal Sampling: green when sampling
Alarm: red when sampling
Low 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
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 functionality fit both novice and advanced users.

The versatility of custom equation and custom-line equation handle 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 view and chart recording replaces chart recording device
  • 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 provides detailed information of current zoomed view
  • Siteview software required (1 license per site) and sold separately

Software Requirements:

  • Computer with 1.0 GHz or faster processor
  • 256K Memory or higher
  • 1.0 GB of available hard-drive space or higher
  • Windows XP with SP2 or later, Vista, Windows 7 and 8
  • At least one USB port or one COM port