PT-104 Data Logger
PT-104 Data Logger
PT-104 Data Logger

Accuracy and Resolution

Although accurate temperature sensors are widely available, it has been difficult to take advantage of these due to errors caused by the measuring device. The 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.

  • Measures temperature, resistance and voltage
  • 4-channel temperature measuring
  • High resolution (0.001°C*) and accuracy (0.01°C)
  • 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


The 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 better accuracy – especially for longer probe cable lengths). A wide range of PT100 sensors is available for use with your PT–104.


When measuring resistance, the unit 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 accurate measurements use the 0 to 2500 mV range.


Your PT104 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.


  Temperature Resistance Voltage
Sensor: PT100*, PT1000 N/A N/A
Range: -200 to 800 °C

0 to 375Ω*
0 to 10 kΩ
0 to 115 mV
0 to 2.5 V*
Linearity: 20ppm
Accuracy@25 °C: 0.01 °C* 20 ppm* 0.2%*
Temp Coefficient: 5 ppm/°C 5 ppm/°C 100 ppm/°C
RMS Noise: 0.01 °C 10 ppm 10 ppm
Resolution: 0.001°C* 1 μΩ 0.156 μV
Number of Inputs: 4
Converter Resolution: 24 bits
Conversion Time 720 ms per channel
Connectors: 4-pin mini DIN
Input Impedence: >1 MΩ
Overload Protection: ±30 V
Output: USB and Ethernet
Software: PicoLog data acquisition s/w for Win XP/Vista Drivers and examples C, pascal, Delphi, Visual Basic, Agilent VEE and LabVIEW. A macro is also provided to collect data directly into an Excel spreadsheet.
PicoLog for Windows
Quoted accuracy is for options marked *

PT100 Probes and Sensors

These four wire Platinum Resistance Probes are top quality PT100 temperature sensors designed for high accuracy and long life. Plugs are compatible with the PT104 Logger and incorporate moulded strain relief.

Applications covered are general purpose, immersion, standard and heavy duty insertion and standard and high temperature air measurement.

The sensors in the table below comply with BS1904. The class A (DIN 43760) sensors offer an accuracy of ±0.15° at 0°C. For increased accuracy we also offer the SE012, tenth-DIN sensor (±0.03° at 0 °C). Please note that these accuracy specifications relate to the SENSOR ONLY. To determine overall measurement system accuracy, always add the sensor error to that of the PT104.

PT100 sensors
PT100 sensors
Model Probe Type Handle Temperature range: Accuracy at 0 °C Dimensions
(Diameter x Length in mm)
SE011General PurposeNo-30 ~ 200°C±0.15° 6 x 150
SE012Immersion - High Accuracy 1/10 DINNo-50 ~ 250°C±0.03° 4 x 150
SE014ImmersionYes-75 ~ 250°C±0.15° 3.30 x 120
SE015Insertion ProbeYes-75 ~ 250°C±0.15°3.30 x 120
SE016Heavy Duty Insertion ProbeYes -150 ~ 650°C±0.15°4 x 150
SE017Air Probe Fast ResponseYes-75 ~ 250°C±0.15°3.30 x 120
SE018Air Probe High TemperatureYes-150 ~ 650°C±0.15°4 x 150
SE019EconomyYes-75 ~ 260°C±0.15° 3 x 120

*15% GST applicable for sales within NZ

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