LPTM-1 SITE-LOG Thermocouple and Temperature Data Logger
The LPTM-1 SITE-LOG is a rugged 7-channel thermocouple data logger designed for multi-point temperature monitoring in industrial, laboratory, research, testing, and environmental applications.
It provides seven external thermocouple input channels plus one built-in temperature channel for ambient temperature monitoring and cold-junction compensation. Each thermocouple channel can be configured independently for the supported thermocouple type and measurement range.
The LPTM-1 is a battery-powered, standalone logger with 8 MB of non-volatile flash memory, allowing temperature data to be recorded in the field and downloaded later through USB. Its rugged aluminum enclosure and conformal-coated PCB make it suitable for long-term use in demanding environments.
Multi-Channel Thermocouple Measurement
The LPTM-1 supports a wide range of thermocouple types, including:
Type B
Type C
Type E
Type J
Type K
Type N
Type R
Type S
Type T
Two programmable input ranges are available to optimize measurement resolution for different thermocouple applications.
The built-in temperature channel measures the local ambient temperature and provides cold-junction compensation for the seven external thermocouple channels.
High-Resolution Data Logging
The LPTM-1 uses a 16-bit analog-to-digital converter for high-resolution thermocouple measurements.
Sampling intervals are programmable from:
20 milliseconds to 12 hours
This allows the same logger to be used for both fast temperature testing and long-term temperature 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 temperature 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 LPTM-1 connects directly to a computer through USB.
SiteView software provides the tools required to:
Configure logging sessions
Select thermocouple types and 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 LPTM-1 provides configurable alarm and control functions for applications that require more than simple 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 LPTM-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 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 LPTM-1 temperature data to be integrated with third-party software, PLCs, HMIs, SCADA systems, and other industrial monitoring platforms.
Smart-Hub Product Specifications
Rugged Industrial Design
The LPTM-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
with up to:
95% RH, non-condensing
Key Features
7 external thermocouple input channels
1 built-in temperature channel
Built-in cold-junction compensation
Supports multiple thermocouple types
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 LPTM-1 is suitable for applications such as:
Industrial temperature monitoring
Laboratory testing
Research and development
Equipment and process testing
Thermal profiling
Environmental monitoring
Multi-point temperature measurement
Product testing and validation
Long-term temperature recording
Documents:
SITE-LOG Thermocouple Data Logger (LPTM-1) Specifications
| General | |
|---|---|
| Product Name | SITE-LOG Thermocouple Data Logger |
| Model | LPTM-1 |
| Inputs | |
| External Input Channels | 7 thermocouple input channels |
| Built-in Temperature Channel | 1 onboard thermistor temperature channel |
| Built-in Temperature Range | -40°C to +70°C (-40°F to +158°F) |
| Input Connection | Pluggable terminal block for external channels, excitation control, and alarm outputs |
| Programmable Input Ranges | -8 mV to +73 mV; -2 mV to +18 mV |
| Input Resolution | 0.0018% |
| Thermistor Accuracy | ±0.2°C(0°C ~ 70°C, 32°F ~ 158°F) |
| Thermocouple Accuracy | ±0.1% ~ 0.2% + T/C Accuracy |
| Over-voltage Protection | ±20VDC |
| Cold-Junction Compensation | Provided by the built-in temperature channel |
| Alarm Functions | |
| Channel Alarm Thresholds | Two programmable alarm thresholds per channel |
| Alarm Outputs | ALARM1 and A2/E terminals can be configured as alarm outputs |
| Alarm Output Type | N-channel MOSFET switch |
| Alarm ON | MOSFET switch ON |
| Alarm OFF | MOSFET switch OFF |
| Maximum Alarm Output | 200mA @ 24 VDC |
| Alarm Delay | Programmable from 0 to 10 minutes in 1-minute increments |
| Alarm Indicator | Status LED flashes red during sampling when an alarm condition is active |
| On-board Memory | |
| Flash Memory | 8 MB (4MB readings) non-volatile flash memory |
| Data Retention | More than 20 years. |
| Memory-Full Options | Stop logging or FIFO mode |
| Sampling and Logging | |
| Sampling Interval | Programmable from 20 milliseconds to 12 hours |
| Fast Sampling Power Requirement | External power is required when the sampling interval is less than 1 second |
| Logging Modes | Stop when memory is full or continue in FIFO mode |
| Logging Activation | Immediate start, delayed start, or field push-button activation |
| Communications | |
| USB Interface | Mini-USB-B |
| USB Cable | USB-A to Mini-USB-B cable included |
| AUX Interface | RJ11 TTL level serial communication |
| Baud Rate | Automatically detected from 2400 to 115200 bps on USB and AUX interfaces |
| Remote Network Access | Available through Microedge Smart-Hub |
| Battery and Power | |
| Internal Battery | Built-in 3.6V Lithium Battery. |
| Battery Life | Up to 10 years at a 1-minute sampling interval, depending on usage and operating conditions |
| External Power | 5 VDC through USB |
| Software | |
| Software | SiteView (Sold separately) |
| Functions | Logger configuration, data download, graphing, real-time monitoring, custom calibration, custom equations, alarm configuration, and data analysis |
| Operating Systems | Windows 8, 10 and 11 |
| Computer Requirement | 1.0 GHz or faster processor; 1 GB RAM or higher; 10 GB available storage or higher |
| Required Interface | At least one available USB port |
| Physical Specifications | |
| Enclosure Material | Aluminum |
| PCB Protection | Conformal coating. |
| Dimension | 88 X 64.2 X 24 mm (3.46 X 2.53 X 0.95 inches) |
| Weight | 200g |
| Mounting | Integrated holes for wall or equipment mounting |
| LED Indicators | |
| The tri-color status LED can be disabled to reduce power consumption. | |
| Green Indication | Normal sampling |
| Red Indication | Alarm condition |
| Amber Indication | Low battery |
| Excitation Control | |
| The A2/E terminal can be configured as an excitation-control output for controlling power to an externally powered sensor or device. The excitation warm-up delay is programmable from: 10 to 240 seconds in 10-second increments | |
| Operating Environment | |
| Operating Temperature | -40 ~ +70 °C (-40 °F ~ 158 °F) |
| Operating Humidity | 0 ~ 95% RH, non-condensing |
| Clock Accuracy | ±1 mintue per month |
| Approval | CE, FCC |
Logger Memory Capacity
| Sampling Interval | Enabled Channel | Logging Capacity |
|---|---|---|
| 1 minute | 1 | 8 years |
| 1 minute | 2 | 4 years |
| 1 minute | 8 | 1 year |
| 10 seconds | 1 | 485 days |
| 10 seconds | 2 | 242 days |
| 10 seconds | 8 | 60 days |
| 1 second | 1 | 48 days |
| 1 second | 2 | 24 days |
| 1 second | 8 | 6 days |
| 100 milliseconds | 1 | 4 days |
| 100 milliseconds | 2 | 2 days |
| 100 milliseconds | 8 | 14.4 hours |
Programmable Channel Range Specifications:
| Range: -8mV ~ +73mV Accuracy: ±0.1% (0.08 mV)@ 25°C + Temperature Compensation Accuracy | |||
|---|---|---|---|
| Thermocouple Type | Temperature Range (°C) | Resolution (°C) | Accuracy (°C) |
| Type E | -171 to +955 | 0.02 | 0.56 |
| Type J | -205 to +1200 | 0.027 | 0.73 |
| Type K | -270 to +1372 | 0.04 | 1.07 |
| Type N | -270 to +1300 | 0.045 | 1.21 |
| Type T | -270 to +400 | 0.037 | 1.00 |
| Type C | 0 to 2320 | 0.1 | 2.5 |
| Type S | -50 to 1768 | 0.04 | 3.85 |
| Range: -2mV ~ +18mV Accuracy: ±0.15% (0.03 mV) @ 25°C + Temperature Compensation Accuracy | |||
| Type E | -35 to 260 | 0.005 | 0.45 |
| Type J | -40 to 330 | 0.0062 | 0.56 |
| Type K | -53 to 437 | 0.0082 | 0.74 |
| Type N | -81 to 532 | 0.01 | 0.92 |
| Type T | -55 to 353 | 0.008 | 0.62 |
| Type B | 0 to 1820 | 0.03 | 3.95 |
| Type R | -50 to 1539 | 0.026 | 2.62 |
| Type S | -50 to 1704 | 0.03 | 2.9 |
| Type C | 0 to 986 | 0.0164 | 1.65 |
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