The SITE-LOG LPMB-1 is a 7-channel, battery-powered, standalone high-accuracy voltage and current data logger designed for industrial, laboratory, research, testing, and process-monitoring applications.

The logger provides:

• 4 voltage input channels
• 3 current input channels
• 1 onboard temperature channel

The voltage channels support programmable ranges of:

• 0 to 20 VDC
• −5 to +5 VDC

The current channels support:

• 4–20 mA
• 0–50 mA

Input signals can come from sensors, transducers, transmitters, process instruments, batteries, power supplies, and other compatible voltage or current sources. 

The onboard temperature channel monitors ambient temperature and provides temperature compensation for improved measurement performance.

Recorded data is stored in 8 MB of non-volatile flash memory, providing long-term standalone data recording without requiring a continuously connected computer.

High-Accuracy Voltage and Current Measurement

The LPMB-1 is designed for applications where both voltage and current signals must be recorded by the same instrument.

Channels 1 through 4 are dedicated to voltage measurement, while channels 5 through 7 are dedicated to current measurement.

The logger uses a 16-bit analog-to-digital converter, providing a resolution of 0.0018%.

Onboard Temperature Monitoring and Compensation

The built-in thermistor measures ambient temperature from:

−40°C to +70°C (−40°F to +158°F)

with an accuracy of:

±0.2°C from 0°C to 70°C

The onboard temperature measurement can be recorded along with the external channels and is also used for temperature compensation.

High-Resolution Data Logging

The LPMB-1 uses a 16-bit ADC for high-resolution voltage and current measurements.

Sampling intervals are programmable from:

20 milliseconds to 12 hours

An external power supply is required when the sampling interval is less than 5 seconds. 

This wide sampling range allows the same logger to support both relatively fast testing and long-term monitoring.

Standalone Operation and Long-Term Recording

The LPMB-1 operates independently after configuration and stores measurements in 8 MB of onboard non-volatile flash memory.

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

Logging can be started by:

• Immediate start
• Programmable delayed start
• Field push-button activation

When memory becomes full, the logger can be configured to:

• Stop recording, or
• Continue recording in FIFO mode

The internal lithium battery provides up to approximately 10 years of operation at a 1-minute sampling interval, depending on operating conditions and configuration. 

USB Communication and SiteView Software

The LPMB-1 connects directly to a Windows PC through its Plug & Play USB interface.

SiteView software provides tools for:

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

The LPMB-1 also provides an AUX TTL-level serial communication interface with automatic baud-rate detection from 2400 to 115200 bps. 

Alarm and Excitation Control

The LPMB-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

The LPMB-1 can be connected to a Microedge Smart-Hub for remote access over an Ethernet network.

Smart-Hub functions as a USB Device Server, allowing the LPMB-1 to be accessed remotely by:

• SiteView
• SiteView-Web
• SiteView SDK
• Pluto

Smart-Hub can also provide:

• RESTful Web API
• Modbus TCP Gateway

This allows LPMB-1 measurements to be incorporated into remote monitoring systems and third-party industrial applications.

Rugged Industrial Design

The LPMB-1 uses a durable aluminum enclosure and a conformal-coated circuit board for additional protection against:

• Moisture
• Corrosion
• Mildew

The logger is designed for operation from:

−40°C to +70°C (−40°F to +158°F)

at:

0–95% RH, non-condensing. 

KEY FEATURES

• 7 External Measurement Channels
  Four voltage channels and three current channels allow voltage and current signals to be monitored by the same logger.

• Onboard Temperature Channel
  Built-in thermistor provides ambient-temperature monitoring and temperature compensation.

• Programmable Voltage Ranges
  Voltage channels support 0–20 VDC and −5 to +5 VDC ranges.

• Programmable Current Ranges
  Current channels support 4–20 mA and 0–50 mA signals.

• 16-Bit Data Resolution
  High-resolution ADC provides 0.0018% measurement resolution.

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

• Wide Sampling Interval Selection
  Programmable from 20 milliseconds to 12 hours.

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

• USB Communication
  Plug & Play USB provides direct communication with SiteView.

• TTL-Level Serial Communication
  AUX interface supports automatic baud-rate detection from 2400 to 115200 bps.

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

• Alarm and Excitation Control
  Supports programmable alarm thresholds, MOSFET alarm outputs, and excitation control.

• Programmable Warm-Up Delay
  Excitation warm-up delay can be configured from 10 to 240 seconds.

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

• Remote Network Access
  Connect to Smart-Hub for remote access through SiteView, SiteView-Web, SiteView SDK, and Pluto.

• RESTful API and Modbus TCP Integration
  Smart-Hub provides interfaces for integration with compatible third-party software and industrial systems.

• Rugged Aluminum Enclosure

• Conformal-Coated PCB

TYPICAL APPLICATIONS

The LPMB-1 is suitable for:

• 4–20 mA transmitter monitoring
• 0–50 mA current measurement
• Voltage signal recording
• Process instrumentation
• Pressure transmitters
• Flow transmitters
• Level transmitters
• Environmental sensors
• Industrial sensor monitoring
• Battery and power-supply monitoring
• Laboratory testing
• Product validation
• Research
• Equipment monitoring
• Long-term process data acquisition

DOCUMENTS

• SITE-LOG High Accuracy Voltage and Current Data Logger (LPMB-1) Specifications
• SiteView Specifications