4-Channel RTD Input Data Acquisition Module
Discontinued Product


4-Channel RTD Input Data Acquisition Module | PT-104

4-Channel RTD Input Data Acquisition Module

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2 anos de garantia CE
  • High Accuracy (0.01°C) and Resolution (0.001°C)
  • No Power Supply Required
  • RS-232 or USB Interface (USB Interface via Included RS-232 to USB Interface Converter)
  • For Use with Pt100 and Pt1000 RTD Sensors


The PT-104 is no longer available please see the PT-104A as a possible alternative or contact our data aquisition department.

The PT-104 is a four-channel, high-resolution temperature data acquisition module for use with Pt100 and Pt1000 RTD sensors. It can also be used to measure resistance (375 Ω and 10,000 Ω ranges) and voltage (115 mV or 2.5 V ranges).

In Pt100/Pt1000/resistance mode, the unit uses a four-wire circuit. In voltage mode, the input connector can be treated as a differential input with ground, or two single-ended inputs. Both inputs must be 0 V or above, though it does not matter which input has the higher voltage. For the 115 mV voltage range, the accuracy may vary by 2%, and the temperature co-efficient will be 100 ppm/°C.

Although accurate temperature sensors are widely available, it has been difficult to take advantage of them due to errors caused by the measuring device. The PT-104, however, is designed to be inherently accurate. 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). To achieve the 0.001°C resolution a highly-advanced ADC is used that can resolve to better than 1 part in 16 million.

The PT-104 measures temperature using platinum resistance temperature sensors (RTDs). 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).

When measuring resistance, the unit 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.

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.

Remote Data Collection
The PT-104 is normally connected directly to a PC, but it is also possible to communicate with the
PT-104 using a modem (radio or telephone) so that you can collect data from a remote site.

The PT-104 is supplied with Windows® Logging and Player Software. The software will automatically detect which sensor is connected and will display readings in the correct units. Also supplied is a software development kit (SDK).

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. With the included Logging Software you can set the sampling interval from 1 second to several hours and set the maximum number of readings.

You can also tell PT-104 data acquisition module what do to when the temperature readings have been taken - either: stop; repeat immediately (start again); scroll (oldest recordings disappear); or repeat after delay (where the delay is set by the user). Multiple PT-104 modules can be used simultaneously with the Logging Software. Also, PT-104 modules can be mixed with TC-08 thermocouple input modules and used at the same time. Up to 20 units of any kind (PT-104 or TC-08) can be connected. Using the PT-104 Logging Software, data can be viewed in a spreadsheet and/or in a graph as it is being recorded. Data collected from previous recordings can also be viewed using the Player.

Refer to PDF for detailed specifications.
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