Omega Products PT-104A User Manual

Four Channel RTD Input
Data Acquisition Module

with USB or Ethernet Interface

PT-104A

U Measures Temperature (RTDs),

Resistance and Voltage

U High Accuracy (0.01°C)

and Resolution (0.001°C)

U Powered by USB Port or

Power-Over-Ethernet (PoE)

U For Use with 2, 3 and 4-Wire

Pt100 and Pt1000 RTD Sensors

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 Ω and 10,000 Ω
ranges) and voltage (115 mV or

2.5V 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.

Comes complete
with 4 mating mini DIN
screw terminal
connectors, USB
cable, ethernet patch
cable, and Windows
software.

®

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 highly-advanced
ADC is used that can resolve to better
than 1 part in 16 million.

PT-104A
shown smaller
than actual size.

Temperature

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).

Resistance

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

Two resistance ranges are available
(0 to 375

The unit is calibrated for 0 to 375

Ω and 0 to 10,000 Ω).

Ω

so this range should be used for
accurate measurements.

Voltage

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.

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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-over­Ethernet (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.

Software

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.

Specifications

PT-104A Platinum Resistance Data Logger
Temperature Resistance Voltage

Sensor Pt1001, Pt1000 N/A N/A
Range -200 to 800°C 0 to 375 Ω

(-328 to 1472°F) 0 to 10 kΩ 0 to 2.5V

Linearity 20 ppm 20 ppm 20 ppm
Accuracy @ 25°C 0.01°C
Temperature 5 ppm/°C 5 ppm/°C 100 ppm/°C

Coefficient
RMS Noise 0.01°C 10 ppm 10 ppm

(Using Filter)
Resolution 0.001°C 1 µ Ω 0.156 µV
Conversion Time

Per Channel
Number of Inputs 4
Connectors 4-pin mini DIN
Input Impedance >>1 MΩ

Overvoltage Protection

Power Powered by USB or Ethernet:
USB 1.1: 5V ±10% @ <100 mA
USB 2.0: 5V ±10% @ <200 mA
Ethernet: 48V ±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

±30V

1

20 ppm1 0.2%

720 mS

1

0 to 115 mV

1

1

To Order, Call or Shop Online at omega.com

SM

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