The PRECISE-LOG PL-T is an 8-channel, battery-powered, standalone thermocouple data logger designed for industrial, laboratory, research, testing, and long-term temperature-monitoring applications.

The logger provides:

• 8 external thermocouple input channels
• 1 onboard thermistor temperature channel
• Built-in cold-junction compensation
• USB communication
• 8 MB non-volatile flash memory
• Long-term standalone operation

Each external channel can be independently configured for the required thermocouple type and input range.

The onboard thermistor measures ambient temperature and provides cold-junction compensation for accurate thermocouple measurement.

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

Multi-Channel Thermocouple Measurement

The PL-T provides eight external thermocouple channels for multi-point temperature monitoring.

Two programmable voltage ranges are available:

• −8 mV to +73 mV
• −2 mV to +18 mV

Depending on the selected range, the logger supports thermocouple types:

• B
• C
• E
• J
• K
• N
• R
• S
• T

Each channel can be independently enabled and configured through SiteView.

This allows different thermocouple types or temperature ranges to be used within the same data-logging system. 

Cold-Junction Compensation

The PL-T includes an onboard thermistor that measures ambient temperature from:

−40°C to +70°C (−40°F to +158°F)

The onboard temperature channel is used for cold-junction compensation, allowing the logger to compensate thermocouple measurements for the temperature at the logger terminals.

The onboard thermistor accuracy is:

±0.2°C from 0°C to 70°C. 

High-Resolution Data Logging

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

0.0018%

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

Sampling intervals are programmable from:

1 second to 12 hours. 

Standalone Operation and Long-Term Recording

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

SiteView software provides tools for:

• Configuring thermocouple channels
• Selecting thermocouple types
• Selecting input ranges
• Configuring logging sessions
• Downloading recorded data
• Viewing real-time temperatures
• Displaying graphs and tables
• Configuring alarm thresholds
• Applying custom calibration
• Applying custom equations
• Exporting and analyzing recorded data

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

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

Alarm Functions

The PL-T provides configurable alarm functions for temperature-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-T 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-T temperature data to be integrated with third-party software, PLCs, HMIs, SCADA systems, and other industrial monitoring platforms.

Unlike the PL-TW, the PL-T does not contain a built-in WiFi interface and does not operate directly as a Modbus TCP server. Network and Modbus TCP access for the PL-T is provided through Smart-Hub.

Rugged Industrial Design

The PL-T 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 Thermocouple Channels
  Provides multi-point temperature measurement using independently configurable thermocouple inputs.

• Onboard Temperature Channel
  Built-in thermistor monitors ambient temperature and provides cold-junction compensation.

• Multiple Thermocouple Types
  Supports B, C, E, J, K, N, R, S, and T thermocouples depending on the selected input range.

• Two Programmable Input Ranges
  Supports −8 to +73 mV and −2 to +18 mV ranges.

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

• 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, alarm configuration, 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-T data can be accessed by compatible third-party software.

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

• Rugged Aluminum Enclosure

  
  

TYPICAL APPLICATIONS

The PL-T is suitable for:

• Multi-point temperature monitoring
• Industrial process temperature monitoring
• Laboratory testing
• Research
• Product validation
• Environmental chambers
• Equipment testing
• Oven and furnace monitoring
• HVAC temperature monitoring
• Manufacturing processes
• Thermal testing
• Temperature profiling
• Long-term unattended temperature logging
• Remote temperature monitoring through Smart-Hub
• PLC / SCADA temperature monitoring through Smart-Hub

DOCUMENTS

• PRECISE-LOG Thermocouple Data Logger Specifications
• SiteView Specifications