The PRECISE-LOG PL-V is an 8-channel, battery-powered, standalone DC voltage data logger designed for industrial, laboratory, research, testing, process-monitoring, and long-term data acquisition applications.

The logger provides:

• 8 external DC voltage input channels
• 16-bit measurement resolution
• USB communication
• 8 MB non-volatile flash memory
• Long-term standalone operation

Each external channel can be independently enabled and configured for the required voltage input range.

The programmable voltage ranges are:

• 0 to 20 VDC
• 0 to 5 VDC

The PL-V is the non-WiFi version of the PRECISE-LOG voltage platform and is well suited to applications requiring standalone recording, direct USB communication, or network access through Smart-Hub.

Multi-Channel Voltage Measurement

The PL-V provides eight external DC voltage channels for simultaneous monitoring of sensors, transmitters, batteries, power supplies, test equipment, and other compatible voltage-output devices.

Each channel can be independently enabled and configured through SiteView.

The available programmable input ranges are:

• 0 to 20 VDC
• 0 to 5 VDC

The logger provides:

• 0.0018% measurement resolution
• ±0.05% FSR accuracy at 25°C
• Input impedance greater than 1 MΩ
• Overvoltage protection up to ±40 VDC

These characteristics make the PL-V suitable for both general-purpose voltage recording and higher-accuracy laboratory or industrial measurement applications. 

High-Resolution Data Logging

The PL-V uses a 16-bit analog-to-digital converter with a measurement resolution of:

0.0018%

This provides high-resolution voltage measurement for industrial, laboratory, research, validation, and testing applications.

Standalone Operation and Long-Term Recording

The PL-V operates independently after configuration and stores measurements in 8 MB of non-volatile flash memory.

The memory provides storage for approximately 4 million readings and retains recorded data for more than 20 years.

Logging can be configured for:

• Immediate start
• Delayed start
• Field push-button activation

When memory becomes full, the logger can either:

• Stop recording, or
• Continue recording in FIFO mode

The built-in 3.6 V lithium battery provides up to approximately 10 years of operation at a 1-minute sampling interval in standalone mode, depending on operating conditions and configuration. 

USB Communication and SiteView Software

The PL-V connects directly to a Windows PC through its Plug & Play USB interface.

SiteView software provides tools for:

• Configuring voltage channels
• Selecting input ranges
• Configuring logging sessions
• Downloading recorded data
• Viewing real-time voltage measurements
• Displaying graphs and tables
• Configuring alarm thresholds
• Applying custom calibration
• Applying custom equations
• Converting voltage signals into engineering units
• Exporting and analyzing recorded data

For local operation, SiteView communicates directly with the PL-V through USB.

For network applications, the PL-V can be connected to a Smart-Hub and accessed remotely by supported Microedge software.

Custom equations are especially useful when the PL-V is connected to sensors or transmitters whose voltage output represents another engineering quantity such as pressure, flow, level, position, temperature, or humidity.

Alarm Functions

The PL-V provides configurable alarm functions for voltage-monitoring applications.

Each channel supports two programmable alarm thresholds.

The onboard tri-color status LED provides visual indication of:

• Normal sampling
• Alarm condition
• Low battery

The LED can be disabled to reduce power consumption. 

Remote Access and Network Integration

Although the PL-V is a USB-based data logger, it can also be accessed remotely over an Ethernet network by connecting it to a Microedge Smart-Hub.

Smart-Hub acts as a communication gateway and allows connected USB data loggers to be accessed through:

• SiteView
• SiteView-Web
• SiteView SDK
• Pluto

Smart-Hub also provides:

• RESTful Web API
• Modbus TCP Gateway

This allows PL-V voltage data to be integrated with third-party software, PLCs, HMIs, SCADA systems, and other industrial monitoring platforms.

Unlike the PL-VW, the PL-V does not contain a built-in WiFi interface and does not operate directly as a Modbus TCP server. Network, RESTful API, and Modbus TCP access for PL-V are provided through Smart-Hub.

Rugged Industrial Design

The PL-V is housed in a durable aluminum enclosure designed for laboratory, industrial, and field applications.

Its operating environment is:

−40°C to +70°C (−40°F to +158°F)

and:

0–95% RH, non-condensing. 

KEY FEATURES

• 8 External DC Voltage Channels
  Provides simultaneous multi-channel voltage measurement for sensors, transmitters, batteries, power supplies, and other compatible voltage sources.

• Programmable Voltage Ranges
  Supports 0–20 VDC and 0–5 VDC input ranges.

• High Measurement Accuracy
  Provides ±0.05% FSR accuracy at 25°C.

• 16-Bit Data Resolution
  Provides 0.0018% measurement resolution.

• High Input Impedance
  Greater than 1 MΩ input impedance minimizes loading of connected voltage sources.

• Input Protection
  Voltage inputs are protected up to ±40 VDC.

• 8 MB Non-Volatile Flash Memory
  Stores approximately 4 million readings for long-term standalone recording.

• 1 Second to 12 Hour Sampling
  Wide programmable sampling interval selection for short-term testing and long-term monitoring.

• Long Battery Life
  Up to approximately 10 years at a 1-minute sampling interval in standalone operation.

• USB Communication
  Provides direct local communication with SiteView.

• SiteView Software Support
  Provides logger configuration, data download, real-time monitoring, plotting, calibration, custom equations, alarms, and data analysis.

• Programmable Alarm Thresholds
  Two configurable alarm thresholds are available for each channel.

• Flexible Logging Modes
  Supports immediate start, delayed start, field push-button activation, stop-on-full, and FIFO operation.

• Remote Network Access through Smart-Hub
  Smart-Hub provides Ethernet access for SiteView, SiteView-Web, SiteView SDK, and Pluto.

• RESTful Web API Integration
  Through Smart-Hub, PL-V data can be accessed by compatible third-party software.

• Modbus TCP Gateway Integration
  Smart-Hub can expose connected PL-V data through Modbus TCP for integration with PLCs, HMIs, SCADA systems, and other Modbus TCP masters.

• Custom Engineering-Unit Conversion
  SiteView custom equations can convert voltage signals into pressure, flow, level, temperature, humidity, position, and other engineering units.

• Rugged Aluminum Enclosure

  
  

TYPICAL APPLICATIONS

The PL-V is suitable for:

• Multi-channel DC voltage monitoring
• Industrial sensor monitoring
• Process transmitter monitoring
• Battery voltage monitoring
• Power-supply testing
• Laboratory testing
• Research
• Product validation
• Equipment monitoring
• Environmental sensor monitoring
• Pressure sensor monitoring
• Flow and level transmitter monitoring
• Long-term unattended voltage logging
• Remote voltage monitoring through Smart-Hub
• PLC / SCADA voltage monitoring through Smart-Hub

DOCUMENTS

• PRECISE-LOG PL-V Voltage Data Logger Specifications
• SiteView Specifications