LPTH-1 SITE-LOG Thermistor and Temperature Data Logger

The LPTH-1 SITE-LOG is a rugged 7-channel thermistor data logger designed for multi-point temperature and resistance monitoring in industrial, laboratory, research, testing, and environmental applications.

It provides seven external thermistor/resistance input channels plus one built-in temperature channel for ambient temperature monitoring. The LPTH-1 is particularly well suited for 10 kΩ NTC thermistors, while SiteView equations allow the logger to support other compatible thermistor and resistance measurement applications.

The LPTH-1 is a battery-powered, standalone logger with 8 MB of non-volatile flash memory, allowing measurements to be recorded in the field and downloaded later through USB. Its rugged aluminum enclosure and conformal-coated PCB provide additional protection for long-term use in demanding environments.

Multi-Channel Thermistor and Resistance Measurement

The LPTH-1 provides seven external channels for connecting thermistors or resistive sensors.

It can be used for applications such as:

• Multi-point temperature monitoring

• 10 kΩ NTC thermistor measurement

• Resistance measurement

• Laboratory temperature testing

• Equipment and process monitoring

• Environmental temperature monitoring

For thermistor applications, SiteView converts the measured resistance into temperature using the selected thermistor equation.

Users can enter known thermistor coefficients or calculate them from temperature-resistance data points.

High-Resolution Data Logging

The LPTH-1 uses a 16-bit analog-to-digital converter for high-resolution measurements.

Sampling intervals are programmable from:

20 milliseconds to 12 hours

This allows the same logger to be used for both fast testing and long-term monitoring.

For sampling intervals below one second, external power is required.

Standalone Operation and Long-Term Recording

Recorded data is stored in 8 MB of onboard non-volatile flash memory and retained even when external power is removed.

Depending on the sampling interval and number of enabled channels, the logger can record from hours to years of data.

The logger supports:

• Stop logging when memory is full

• FIFO logging mode

• Immediate logging

• Delayed start

• Field push-button activation

With a 1-minute sampling interval, the internal battery can provide up to 10 years of operation, depending on usage and operating conditions.

USB Communication and SiteView Software

The LPTH-1 connects directly to a computer through USB.

SiteView software provides the tools required to:

• Configure logging sessions

• Configure thermistor equations

• Download recorded data

• View real-time readings

• Display data in graph and table formats

• Configure alarms

• Apply custom equations and engineering-unit conversions

• Export and analyze recorded data

SiteView is sold separately.

Alarm and Excitation Control

The LPTH-1 provides configurable alarm and control functions for applications requiring more than basic data recording.

Each channel supports two programmable alarm thresholds.

The available output terminals can be configured for:

• Alarm output

• Excitation control

The onboard status LED provides visual indication of normal sampling, alarm conditions, and low battery status.

Remote Access and Network Integration

Although the LPTH-1 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 allows the LPTH-1 to be accessed through:

• SiteView

• SiteView-Web

• SiteView SDK

• Pluto

Smart-Hub also provides:

• RESTful Web API

• Modbus TCP Gateway

This allows LPTH-1 thermistor and resistance measurements to be integrated with third-party software, PLCs, HMIs, SCADA systems, and other industrial monitoring platforms.

Smart-Hub Specifications Page

Rugged Industrial Design

The LPTH-1 is housed in a durable aluminum enclosure.

Its circuit board is protected with conformal coating to help resist:

• Moisture

• Corrosion

• Mildew

The logger is designed for operation in environments from:

-40°C to +70°C (-40°F to +158°F)

with up to:

95% RH, non-condensing

Key Features

• 7 external thermistor/resistance input channels

• 1 built-in temperature channel

• Optimized for 10 kΩ NTC thermistors

• 16-bit analog-to-digital converter

• 8 MB non-volatile flash memory

• 20 ms to 12 hr programmable sampling interval

• USB communication

• AUX TTL-level serial communication

• Programmable alarm thresholds

• Alarm output and excitation control

• Stop or FIFO logging mode

• Immediate, delayed, or push-button logging activation

• Up to 10 years of battery life at a 1-minute sampling interval

• Rugged aluminum enclosure

• Conformal-coated PCB

• SiteView software support

• Remote Ethernet access through Smart-Hub

• RESTful Web API and Modbus TCP integration through Smart-Hub

Typical Applications

The LPTH-1 is suitable for:

• Multi-point temperature monitoring

• Thermistor sensor testing

• Laboratory research

• Environmental monitoring

• Industrial equipment monitoring

• Process temperature monitoring

• Product testing and validation

• Long-term temperature recording

• Resistance measurement

  
  

Documents: 

SITE-LOG Thermistor Data Logger (LPTH-1) Specifications

SiteView Specifications