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PICO PT-104 Data Logger

pc oscilloscope, data acquisition and automotive diagnostics from Pico Technology



The PT-104 is a 4-channel temperature measuring data logger. It offers the ultimate in resolution (0.001 °C) and accuracy (0.01 °C). Along with temperature it can also be used to measure resistance and voltage.


PT-104 Platinum Resistance Data Logger

  • Measures temperature, resistance and voltage
  • High resolution and accuracy
  • Works with PT100 and PT1000 sensors
  • Supports 2,3 and 4-wire sensors
  • No power supply required
  • USB and Ethernet interfaces
  • Run multiple units on a single PC

Accuracy and Resolution

Although accurate temperature sensors are widely available, it has been difficult to take advantage of them due to errors caused by the measuring device. Your PT-104 however, is inherently accurate due to its innovative design. Rather than relying on voltage references (which tend to be temperature sensitive) it uses ‘reference’ resistors which are extremely stable (low temperature co-efficient and drift). The exact value of each resistor is stored in an EEPROM to provide the ultimate in accuracy (yearly re-calibration is recommended). A high-performance 24-bit ADC is used to achieve the 0.001 °C resolution. 


Your PT-104 measures temperature using platinum resistance thermometers (PRTs). Both common industry standards (PT100 and PT1000) are supported. The unit is compatible with 2, 3 and 4 wire sensors (4 wire PT100 sensors are recommended for accurate measurements). A wide range of PT100 sensors (see Accessories) are available for use with your PT-104.


When measuring resistance, your PT-104 uses a four-wire circuit to give the greatest possible accuracy.

Two resistance ranges are available (0 to 375 ohms and 0 to 10,000 ohms). The unit is calibrated for 0 to 375 ohms so this range should be used for accurate measurements.


For voltage measurements, each input connector can be treated as a differential input with ground, or two single-ended inputs. Both inputs must be zero volts or above, though it does not matter which input has the higher voltage.

Two voltage ranges are 

available (0 to 115 mV and 0 to 2500 mV). For the most accurate measurements use the 0 to 2500 mV range.


Your PT100 data logger is supplied with PicoLog data logging software. PicoLog will automatically detect which sensor is connected and will display readings in the correct units.

Also supplied is a software development kit. The SDK contains a range of software drivers and example code that you can use to write your own software or to use your PT-104 data logger with third-party software.

But I need to measure more channels…

Your PT-104 is capable of measuring up to 4 channels at once. Need more channels? No problem. Using PicoLog you can connect up to 4 Pico data loggers to one PC — giving you a potential 16-channel PT100 data logger, or the ability to use your PT-104 logger with other Pico devices such as the PicoLog 1000 multi-channel data logger.

The ultimate in portability

With both USB and Ethernet interfaces your PT-104 can be used in a variety of situations. If you need a portable solution that can be used at various locations and is fast to set up and use, simply connect your laptop to the PT-104 by USB. Need to monitor a situation over a period of hours or days, or from a remote location? Plug your PT-104 into a spare port on your network and then access it remotely either from your LAN or over the internet (using Power over Ethernet (PoE) technology means that you don’t even need a separate power supply).

When accuracy is paramount the PT-104 is what you need

The PT-104 platinum resistance data logger gives you the ultimate in resolution and accuracy. You can use it to measure temperature, voltage and resistance. Having both USB and Ethernet interfaces gives you the choice of how you connect and power your PT-104, along with the ability to access the PT-104 remotely over a LAN or the internet. When the accuracy of your temperature measurements is paramount the PT-104 is what you need.

PicoLog Software

PicoLog 6 is a complete data acquisition software package for the Pico Technology ADC-20 and 24 precision voltage input data loggers. It provides a visual, easy-to-use interface for users to quickly set up simple or complex acquisitions, record, view and analyze data.
  • Real-time data collection and display
  • Visual logger and channel setup for easy configuration and viewing
  • Available for Windows 7, 8 and 10 (32 and 64-bit), macOS and Linux
  • Virtually unlimited logging capacity to PC
  • Robust database format minimizes data loss and corruption
  • Simple and complex programmable alarms
  • Up to 4 independent graph axes
  • Channels can be scaled using lookup table or equation
  • Data can be exported as CSV, clipboard image and PDF
  • Supports multiple different PicoLog data loggers on the same PC

More information on PicoLog 6 data logging software >>





PicoLog CM3 Manuals

Resource Language Version Size Updated
Data Sheets:
PT-104 (USB/Ethernet) Data Sheet English 5 2 MB January 3 2019
User's Guides:
PT-104 (USB/Ethernet) Data Logger User’s Guide English 2 620 KB June 26 2013
PicoLog User’s Guide English 5 2 MB February 17 2014
Programmer's Guides:
PT-104 (USB/Ethernet) RTD Data Logger Programmer’s Guide English 7 525 KB May 25 2016
Quick Start Guides:
USB Data Logger Installation Guide English
中文 (简体)
7 400 KB January 17 2012
Training Guides:
PicoLog Frequently Asked Questions English 2 932 KB October 10 2016

PT-104 Accessories


All our sensors have been carefully selected to offer high performance at a low cost.


Product Price
PT104 adapter Screw terminal adaptor for PT-104

PT100 air probe, fast response, 1 m
PT100 air probe, high temperature, 1 m

PT100 probe, 1/10 DIN accuracy, 2 m

PT100 probe, general purpose, 2 m
PT100 probe, heavy duty insertion, 1 m
PT100 probe, high-temperature stainless steel braided cable, 2 m
PT100 probe, immersion, 1 m
PT100 probe, insertion, 1 m
PT100 probe, low cost, 1 m


Product Price
USB 2.0 cable, 1.8 m
  Calibration certificate for RTD loggers


PT-104 Platinum Resistance Data Logger Specifications

  Temperature Resistance Voltage
Sensor PT100, PT1000 n/a n/a
Range -200 to 800 °C 0 to 275 Ω
0 to 10 kΩ
0 to 115 mV
0 to 2.5 V
Linearity 20 ppm
Accuracy (at 25 °C) 0.01 °C 20 ppm 0.2% (2.5 V)
Temperature coefficient 5 ppm/°C 5 ppm/°C 100 ppm/°C
RMS noise with filter 0.01 °C 10 ppm 10 ppm
Resolution 0.001 °C 1 µΩ 0.156 µV
Overload protection ±30 V
Number of inputs 4
Converter resolution 24 bits
Conversion time 720 ms per channel
Input connectors 4-pin mini DIN
Input impedance >1 MΩ
Output connectors USB and Ethernet
PC Requirements
Minimum Processor: 1 GHz
Memory: 512 MiB
Free disk space: 32–bit: 600 MB, 64–bit: 1.5 GB
Operating system: 32– or 64–bit edition of Microsoft Windows XP (SP3), Vista, Windows 7, Windows 8 (not Windows RT) or Windows 10
Ports: USB 1.1 or Ethernet.
Recommended Processor: 1 GHz
Memory: 512 MiB
Free disk space: 32–bit: 850 MB, 64–bit: 2 GB
Operating system: 32– or 64–bit edition of Microsoft Windows 7, Windows 8 (not Windows RT) or Windows 10
Ports: USB 1.1 (or higher) or Ethernet
Operating environment
Temperature range
Humidity range

0 °C to 70 °C (20°C to 30°C for quoted accuracy)
20% to 90% RH, non-condensing
Storage environment
Temperature range

-20 to 80°C
5 to 95% RH, non-condensing
Physical Dimensions
Dimensions 184 x 135 x 36 mm (approx 5.31 x 7.24 x 1.42 in)
Weight 350 g (approx 12.3 oz)
PicoLog for Windows PicoLog data acqusition software can collect up to 1 million samples. Features include:
Multiple views - view data as a graph, spreadsheet or text
Parameter scaling - convert raw data into standard engineering units
Math functions - use mathematical equations to calculate additional parameters
Alarm limits - program an alert if a parameter goes out of a specified range
IP networking - transfer measurements via a LAN or over the Internet
Full details on PicoLog
Software development kit A growing collection of drivers and example code for various programming languages
Language support
Full support for English, French and German; menus only for Italian, Spanish and Swedish
User’s guide
Programmer’s guide

English, French, German, Italian, Spanish
Additional hardware (supplied) USB 2.0 cable, Ethernet cable, user manuals, software CD-ROM
PC interface USB 2.0 (USB 1.1 compatible) or Ethernet (cables supplied)
Power requirements Powered from USB port or Ethernet
Compliance FCC (EMC), CE (EMC and LVD), RoHS compliant
Total Satisfaction Guarantee In the event that this product does not fully meet your requirements you can return it for an exchange or refund. To claim, the product must be returned in good condition within 14 days.
Warranty 5 years

Order your PT-104 Logger Here [PP682]:




USA Office

Address: 1480 Gulf Road, Suite 837,
PO Box 1364
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027