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Table of Contents Preface About this User’s Guide............................................................................................................................. 5 What you will learn from this user’s guide .............................................................................................................. 5 Conventions in this user’s guide ...............................................................................................................................
OM-USB-TEMP User's Guide Data linearization......................................................................................................................................................................20 USB connector......................................................................................................................................................... 20 LED..............................................................................................................................
Preface About this User’s Guide What you will learn from this user’s guide This user’s guide explains how to install, configure, and use the OM-USB-TEMP so that you get the most out of its USB-based temperature measurement features. This user’s guide also refers you to related documents available on our web site, and to technical support resources.
Introducing the OM-USB-TEMP Chapter 1 Overview: OM-USB-TEMP features This user's guide contains all of the information you need to connect the OM-USB-TEMP to your computer and to the signals you want to measure. The OM-USB-TEMP is a USB 2.0 full-speed, temperature measurement module that is supported under popular Microsoft® Windows® operating systems. The OM-USB-TEMP is fully compatible with both USB 1.1 and USB 2.0 ports.
OM-USB-TEMP User's Guide Introducing the OM-USB-TEMP OM-USB-TEMP block diagram OM-USB-TEMP functions are illustrated in the block diagram shown here. Figure 1. OM-USB-TEMP functional block diagram Software features For information on the features of InstaCal and the other software included with your OM-USB-TEMP, refer to the OMB-DAQ-2416 Series and OM-USB Series Software User’s Guide that shipped with your device.
OM-USB-TEMP User's Guide Introducing the OM-USB-TEMP Connecting a OM-USB-TEMP to your computer is easy Installing a data acquisition device has never been easier. The OM-USB-TEMP relies upon the Microsoft Human Interface Device (HID) class drivers. The HID class drivers ship with every copy of Windows that is designed to work with USB ports. We use the Microsoft HID because it is a standard, and its performance delivers full control and maximizes data transfer rates for your OM-USB-TEMP.
Installing the OM-USB-TEMP Chapter 2 What comes with your OM-USB-TEMP shipment? The following items are shipped with the OM-USB-TEMP. Hardware OM-USB-TEMP USB cable (2 meter length) Additional documentation In addition to this hardware user's guide, you should also receive the OMB-DAQ-2416 Series and OM-USB Series Software User’s Guide. This booklet supplies a brief description of the software you received with your OM-USB-TEMP and information regarding installation of that software.
OM-USB-TEMP User's Guide Installing the OM-USB-TEMP Installing the software Refer to the OMB-DAQ-2416 Series and OM-USB Series Software User’s Guide for instructions on installing the software on the OMB-DAQ-2416 Series and OM-USB Series Data Acquisition Software CD. This booklet is available in PDF at http://omega.com/manuals. We recommend that you download the latest Windows Update onto your computer before installing and operating the OM-USB-TEMP.
Chapter 3 Sensor Connections The OM-USB-TEMP supports the following temperature sensor types: Thermocouple – types J, K, R, S, T, N, E, and B Resistance temperature detectors (RTDs) – 2, 3, or 4-wire measurement modes of 100 _ platinum RTDs. Thermistors – 2, 3, or 4-wire measurement modes. Semiconductor temperature sensors – LM36 or equivalent Sensor selection The type of sensor you select will depend on your application needs.
OM-USB-TEMP User's Guide Sensor Connections OM-USB-TEMP screw terminal descriptions Pin 1 2 3 4 5 6 7 8 9 10 Signal Name I1+ NC C0H C0L 4W01 IC01 C1H C1L GND I1- Pin Description Pin CH0/CH1 current excitation source Not connected CH0 sensor input (+) CH0 sensor input (-) CH0/CH1 4-wire, 2 sensor common CH0/CH1 2-sensor common CH1 sensor input (+) CH1 sensor input (-) Ground CH0/CH1 current excitation return 27 28 29 30 31 32 33 34 35 36 CJC sensor 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 I2+
OM-USB-TEMP User's Guide Sensor Connections Four-wire, two sensor common terminals (4W01 to 4W67) These terminals are used as the common connection for four-wire configurations with two RTD or thermistor sensors. Two sensor common terminals (IC01 to IC67) These terminals are used as the common connection for two-wire configurations with two RTD or thermistor sensors.
OM-USB-TEMP User's Guide Sensor Connections When thermocouples are attached to conductive surfaces, the voltage differential between multiple thermocouples must remain within ±1.4 V. For best results, we recommend the use of insulated or ungrounded thermocouples when possible.
OM-USB-TEMP User's Guide Sensor Connections Figure 4. Two-wire, single RTD or thermistor sensor measurement configuration When you select a two-wire single sensor configuration with InstaCal, connections to C#H and C#L are made internally. Two-wire, two sensor A two-wire, two-sensor measurement configuration is shown in Figure 5. Figure 5.
OM-USB-TEMP User's Guide Sensor Connections Four-wire configuration With a four-wire configuration, connect two sets of sense/excitation wires at each end of the RTD or thermistor sensor. This configuration completely compensates for any lead-wire resistance and temperature change in leadwire resistance. Connect your sensor with a four-wire configuration when your application requires very high accuracy measurements.
OM-USB-TEMP User's Guide Sensor Connections thermocouples and RTDs. However, semiconductor sensors can be accurate, inexpensive and easy to interface with other electronics for display and control. The OM-USB-TEMP makes high-resolution measurements of semiconductor sensors, such as the LM36 or equivalent, and returns a 32-bit floating point value in either a voltage or temperature format. Use InstaCal to select the sensor type (TMP36 or equivalent) and the sensor input channel to connect the sensor.
Chapter 4 Functional Details Thermocouple measurements A thermocouple consists of two dissimilar metals that are joined together at one end. When the junction of the metals is heated or cooled, a voltage is produced that correlates to temperature. The OM-USB-TEMP hardware level-shifts the thermocouple’s output voltage into the A/D’s common mode input range by applying +2.5 V to the thermocouple’s low side at the C#L input. Always connect thermocouple sensors to the OM-USB-TEMP in a floating fashion.
OM-USB-TEMP User's Guide Functional Details To reduce the error, reduce the length of the thermocouple to lower its resistance, or lower the AWG of the wire by using a wire with a larger diameter. With open-thermocouple detection disabled, 30 nA (max) of input leakage current is injected into the thermocouple. RTD and thermistor measurements RTDs and thermistors are resistive devices that require an excitation current to produce a voltage drop that can be measured differentially across the sensor.
Chapter 5 Specifications All specifications are subject to change without notice. Typical for 25 °C unless otherwise specified. Specifications in italic text are guaranteed by design. Analog input Table 1.
OM-USB-TEMP User's Guide Specifications Channel configurations Table 2.
OM-USB-TEMP User's Guide Specifications Accuracy Thermocouple measurement accuracy Table 4. Thermocouple accuracy specifications, including CJC measurement error Sensor Type Maximum error J ±1.499 °C K 0 to 1200 °C ±0.691 °C ±0.345 °C 0 to 1372 °C ±1.841 °C ±0.399 °C 250 to 1768.1 °C ±1.070 °C ±0.358 °C 250 to 1768.1 °C ±0.912 °C ±0.369 °C 700 to 1820 °C ±0.639 °C ±0.245 °C 0 to 1000 °C ±0.713 °C ±0.256 °C 0 to 600 °C ±0.769 °C ±0.272 °C 0 to 1300 °C ±2.653 °C B ±1.
OM-USB-TEMP User's Guide Specifications RTD measurement accuracy Table 6. RTD measurement accuracy specifications RTD Sensor Temperature Maximum Accuracy Error (°C) Ix+ = 210 µA Typical Accuracy Error (°C) Ix+ = 210 µA PT100, DIN, US or ITS-90 -200°C to -150°C ±2.85 ±2.59 -100°C to 0°C ±0.58 ±0.31 -150°C to -100°C 0°C to 100°C 100°C to 300°C 300°C to 600°C Note 8: Note 9: ±1.24 ±0.97 ±0.38 ±0.11 ±0.39 ±0.12 ±0.40 ±0.12 Error shown does not include errors of the sensor itself.
OM-USB-TEMP User's Guide Specifications Note 12: Resistance values greater than 180 k ohms cannot be measured by the OM-USB-TEMP in the thermistor mode. The 180 k ohm resistance limit includes the total resistance across the current excitation (±Ix) pins, which is the sum of the thermistor resistance and the lead resistances. Note 13: For accurate three wire compensation, the individual lead resistances connected to the ±Ix pins must be of equal value. Throughput rate Table 9.
OM-USB-TEMP User's Guide Specifications Microcontroller Table 12. Microcontroller specifications Type Two high-performance 8-bit RISC microcontrollers USB +5V voltage Table 13. USB +5V voltage specifications Parameter Conditions Specification USB +5V (VBUS) input voltage range 4.75 V min. to 5.25 V max. Power Table 14.
OM-USB-TEMP User's Guide Specifications Current excitation outputs (Ix+) Table 16. Current excitation output specifications Parameter Conditions Specification Configuration Current excitation output ranges Tolerance 4 dedicated pairs: ±I1 - CH0/CH1 ±I2 - CH2/CH3 ±I3 - CH4/CH5 ±I4 - CH6/CH7 Thermistor 10 µA typ. RTD 210 µA typ. ±5% typ. Drift 200 ppm/°C Line regulation 2.1 ppm/V max. Load regulation 0.3 ppm/V typ. Output compliance voltage (relative to GND pins 9, 19, 28, 38) 3.90 V max.
OM-USB-TEMP User's Guide Specifications Screw terminal connector type and pin out Table 19. Screw terminal connector specifications Connector type Screw terminal Wire gauge range 16 AWG to 30 AWG Screw terminal pin out Table 20.
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation.
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