The PT-104, is a four-channel temperature measuring platinum resistance data logger. It offers the ultimate in resolution (0.001 °C) and accuracy (0.015 °C). Along with temperature it can also be used to measure resistance and voltage.


- 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 with low temperature coefficient and drift. The exact value of each resistor is stored in an EEPROM to provide the ultimate in accuracy (yearly recalibration is recommended). A high-performance 24-bit ADC is used to achieve the 0.001 °C resolution.


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


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.


When measuring resistance, the PT-104 uses a four-wire circuit to give the greatest possible accuracy. Two resistance ranges are available (0 to 375 Ω and 0 to 10,000 Ω). The unit is calibrated for 0 to 375 Ω so this range should be used for accurate measurements.

Single channel screw terminal adaptor

Interfacing third-party sensors not fitted with the 4-pin mini-DIN connector or measuring voltage or resistance is possible using the PP660 screw terminal adaptor. This inexpensive adaptor has 4 breakout terminals and occupies a single channel of the PT-104.


The PT-104 data logger is supplied with PicoLog 6 data logging software. This powerful yet flexible data acquisition software allows you to collect, manipulate, analyze, display and export data.

Designed from the ground up to be intuitive from the outset, PicoLog 6 allows you to set up the logger and start recording with just a few clicks of the mouse, whatever your level of data logging experience.

From here, starting a capture is simple: plug in the logger, add a channel, press Record, and you’re logging! PicoLog 6 also includes a number of additional features to cater for more advanced data logging needs.

Also available to download, is PicoSDK, 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 such as MATLAB, LabVIEW, C, C++, C# and Python.

But I need to measure more channels…

The PT-104 is capable of measuring up to 4 channels at once. Need more channels? No problem. Using PicoLog you can connect up to 20 PT-104s to one PC – giving you a potential 80-channel PT100 data logger. Alternatively you can use your PT-104 logger with up to 19 other Pico data loggers, such as the PicoLog 1000 multichannel data logger, to create your own custom data acquisition system.
The ultimate in portability

With both USB and Ethernet interfaces, the 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. Please note that PicoLog 6 data logging software only supports Ethernet connection in Windows.
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 6 data logging software for PT-104

PicoLog 6 is a complete data acquisition software package for the PT-104 precision temperature data logger. It provides a visual, easy-to-use interface allowing you to quickly set up simple or complex acquisitions and 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, Linux and Raspbian for Raspberry Pi
- 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
- Data can be exported as CSV, clipboard image and PDF
- Supports multiple different PicoLog data loggers and PicoScope oscilloscopes on the same PC

Model Specifications - Input/output

SensorPT100, PT1000n/an/a
Range–200 to +800 °C0 to 375 Ω; 0 to 10 kΩ0 to 115 mV; 0 to 2.5 V
Accuracy (at 23 ±2 °C)0.015 °C + 0.01% of reading50 ppm at 100 Ω0.4%
Temperature coefficient5 ppm/°C5 ppm/°C100 ppm/°C
RMS noise with filter0.01 °C10 ppm10 ppm
Resolution0.001 °C1 µΩ0.156 µV
Overload protection±30 V
Number of inputs4
Converter resolution24 bits
Conversion time720 ms per channel
Input connectors4-pin mini-DIN
Input impedance >1 MΩ
Output connectorsUSB and Ethernet

PC requirements

Minimum: Processor, Memory, Free disk space: As required by the operating system
Ports: USB 1.1
Operating system: Microsoft Windows 7, 8 or 10, 32-bit and 64-bit versions; macOS 10.9 (Mavericks) or later, 64-bit only; Linux*, 64-bit only
* PicoLog 6 for Linux is distributed as an AppImage, so you can install it without superuser permissions: see for further information. The software has been tested on Red Hat, OpenSUSE and Ubuntu.


Operating environment: 0 °C to 70 °C (20°C to 30°C for quoted accuracy); 20% to 90% RH, non-condensing
Storage environment: -20 to +80°C; 5 to 95% RH, non–condensing

Physical properties

Dimensions: 184 x 135 x 36 mm (approx 5.31 x 7.24 x 1.42 in)
Weight: 350 g (approx 12.3 oz)


Additional hardware (supplied): USB 2.0 cable, Ethernet cable, user manuals, software CD-ROM
PC interface: USB 1.1 (USB 2.0 and USB 3.0 compatible) or Ethernet
Power requirements: Powered from USB port or Ethernet
Compliance: European EMC and LVD standards, FCC Rules Part 15 Class A, RoHS compliant
Warranty: 5 years

Data Sheet

User’s Guide

Programmer Guide

Quick Start Guide


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