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4-Channel RTD Input DAQ Module with USB or Ethernet Interface

4-Channel RTD Input Data Acquisition Module with USB or Ethernet Interface


Item# PT-104A

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $1,061.76
5-9 $1,008.67
10-24 $987.44
25-49 $944.97
50-99 $923.73
100+ $902.50

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Lead Time (If not in stock): 3 weeks
4-Channel RTD Input Data Acquisition Module with USB or Ethernet Interface PT-104A PT-104A
  • Measures Temperature (RTDs), Resistance and Voltage
  • High Accuracy (0.01°C) and Resolution (0.001°C)
  • Powered by USB Port or Power-Over-Ethernet (PoE)
  • For Use with 2, 3 and 4-Wire Pt100 and Pt1000 RTD Sensors

PT-104A Model Options

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Analog Input Type
Analog Input Class
Number of Analog Inputs
Input Range
Interface Protocol

The PT-104A 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 ? and 10,000 ? 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 0V 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 coefficient 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-104A, 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 coefficient 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 highlyadvanced ADC is used that can resolve to better than 1 part in 16 million.

The PT-104A 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 ? and 0 to 10,000 ?). The unit is calibrated for 0 to 375 ? 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 new USB/Ethernet interface allows the logger to be used in a variety of situations: USB-only, USBpowered with Ethernet data, and Ethernet data with Power-over- Ethernet (PoE). Using the Ethernet interface, the PT-104A can be located anywhere on a LAN or on the internet.

Power over Ethernet (PoE)
The PT-104A can obtain its power from the Ethernet port as a Powered Device (PD) according to the PoE standard. To use this feature, you must connect the unit to Power Sourcing Equipment (PSE) such as a network switch, router or power injector that also supports the PoE standard. Any standard Ethernet cable up to 100 m (about 328') in length can be used.

The PT-104A 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-104A 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 the PT-104A 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-104A modules can be used simultaneously with the logging software. Also, PT-104A modules can be mixed with TC-08 thermocouple input modules and used at the same time. Up to 20 units of any kind (PT-104A or TC-08) can be connected.Using the PT-104A 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.

PT-104A Platinum Resistance Data Logger
  Temperature Resistance Voltage
    Sensor Pt1001, Pt1000 N/A N/A
    Range -200 to 800°C
(-328 to 1472°F)
0 to 375 ?1
0 to 10 k?
0 to 115 mV
0 to 2.5V1
    Linearity 20 ppm 20 ppm 20 ppm
    Accuracy @ 25°C 0.01°C1 20 ppm1 0.2%1
5 ppm/°C 5 ppm/°C 100 ppm/°C
    RMS Noise
    (Using Filter)
0.01°C 10 ppm 10 ppm
    Resolution 0.001°C 1 µ ? 0.156 µV
    Conversion Time
    Per Channel
720 mS
    Number of Inputs 4
    Connectors 4-pin mini DIN
    Input Impedance >>1 M?
    Overvoltage Protection ±30V
    Power Powered by USB or Ethernet:
USB 1.1: 5 V ±10% @ <100 mA
USB 2.0: 5 V ±10% @ <200 mA
Ethernet: 48 V ±20% @ <40 mA (<2W)
    Environmental 20 to 30°C (68 to 86°F) for stated accuracy,
0 to 70°C (32 to 158°F) operating,
20 to 90% RH
    Software Logging Software for 32-bit or 64-bit editions of Windows XP
(SP2 or greater), Vista, 7.
Software Development Kit containing drivers and example code for C,
C++, Excel and LabView.
    Ethernet Port Conforms to IEEE 802.3 10Base-T.
Compatible with 10/100/1000Base-T networks.
Conforms to IEEE 802.3af Power-over-Ethernet (PoE).
    USB Port Conforms to USB 2.0 full-speed (12 Mbps)
    Computer Interface USB or Ethernet
    Dimensions 36 H x 135 W x 184 mm D (1.42 x 5.31 x 7.24")
    Weight 500 g (1.1 lb)
1 Quoted accuracy is for options marked

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Are 64bit drivers offered for the PT104A? I develop in 64 bit LabVIEW and cannot use the available 32bit dlls and LabVIEW code examples as a result. Changing my LabVIEW version to 32bit is not an option for me. Thanks.

Asked by: BWKH
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM
Answered by: PVENGR
Date published: 2023-12-14

Do you sell connectors for this unit? Can we get Omega sensors with this connector attached? I am interested in a sensor such as SA1-RTD-4W that could connect to this unit.

Asked by: Jacob_7
Hello Jacob We do sell the connectors separately as well, part number is HH804-CONNECTOR, which you can wire it to SA1-RTD-4W so it will work with the DAQ device.
Answered by: JA Engineer
Date published: 2021-02-09

Logging Recorder: When connected with USB and &quot;Converter type&quot; as PT104 (USB) the DAQ is displayed on device table. When connected with ethernet and &quot;Converter type&quot; as PT-104 (Ethernet) no DAQ device is shown. Connected to iCREATin 48V POE, PSE-480050US

Asked by: rodo
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM.
Answered by: Application Engineer PV
Date published: 2021-07-26
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