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OM-USB-TEMP User's Guide Specifications
Accuracy
Thermocouple measurement accuracy
Table 4. Thermocouple accuracy specifications, including CJC measurement error
Sensor Type
J
K
S
R
B
E
T
N
Note 4:
Note 5:
Note 6:
Maximum error Typical error Temperature range
±1.499 °C
±0.643 °C
±1.761 °C
±0.691 °C
±2.491°C
±1.841 °C
±2.653 °C
±1.070 °C
±1.779 °C
±0.912 °C
±1.471 °C
±0.639 °C
±1.717 °C
±0.713 °C
±1.969 °C
±0.769 °C
±0.507 °C
±0.312 °C
±0.538 °C
±0.345 °C
±0.648 °C
±0.399 °C
±0.650 °C
±0.358 °C
±0.581 °C
±0.369 °C
±0.462 °C
±0.245 °C
±0.514 °C
±0.256 °C
±0.502 °C
±0.272 °C
-210 to 0 °C
0 to 1200 °C
-210 to 0 °C
0 to 1372 °C
-50 to 250 °C
250 to 1768.1 °C
-50 to 250 °C
250 to 1768.1 °C
250 to 700 °C
700 to 1820 °C
-200 to 0 °C
0 to 1000 °C
-200 to 0 °C
0 to 600 °C
-200 to 0 °C
0 to 1300 °C
Thermocouple measurement accuracy specifications include linearization, cold-junction compensation and system noise. These specs are for one year, or 3000 operating hours, whichever comes first, and for operation of the OM-USB-TEMP between 15 °C and 35 °C. For measurements outside this range, add ±0.5 degree to the maximum error shown. There are CJC sensors on each side of the module. The accuracy listed above assumes the screw terminals are at the same temperature as the CJC sensor. Errors shown do not include inherent thermocouple error. Please contact your thermocouple supplier for details on the actual thermocouple error.
Thermocouples must be connected to the OM-USB-TEMP such that they are floating with respect to GND (pins 9, 19, 28, 38). The OM-USB-TEMP GND pins are isolated from earth ground, so connecting thermocouple sensors to voltages referenced to earth ground is permissible as long as the isolation between the GND pins and earth ground is maintained.
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.
Semiconductor sensor measurement accuracy
Table 5. Semiconductor sensor accuracy specifications
Sensor Type Temperature Range (°C) Maximum Accuracy Error
TMP36 or equivalent -40 to 150 °C
Note 7:
±0.50 °C
Error shown does not include errors of the sensor itself. These specs are for one year while operation of the OM-USB-TEMP unit is between 15 °C and 35 °C. Please contact your sensor supplier for details on the actual sensor error limitations.
22
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Table of contents
- 5 About this User’s Guide
- 5 What you will learn from this user’s guide
- 5 Conventions in this user’s guide
- 5 Where to find more information
- 6 Introducing the OM-USB-Temp
- 6 Overview: OM-USB-TEMP features
- 7 OM-USB-TEMP block diagram
- 7 Software features
- 8 Connecting a OM-USB-TEMP to your computer is easy
- 9 Installing the OM-USB-TEMP
- 9 What comes with your OM-USB-TEMP shipment?
- 9 Hardware
- 9 Additional documentation
- 9 Unpacking the OM-USB-TEMP
- 10 Installing the software
- 10 Installing the OM-USB-TEMP
- 10 Configuring the OM-USB-TEMP
- 10 Calibrating the OM-USB-TEMP
- 11 Sensor Connections
- 11 Screw terminal pin out
- 12 Sensor input terminals (C0H/C0L to C7H/C7L)
- 12 Current excitation output terminals (±I1 to ±I4)
- 13 Four-wire, two sensor common terminals (4W01 to 4W67)
- 13 Two sensor common terminals (IC01 to IC67)
- 13 Ground terminals (GND)
- 13 Power terminals (+5V)
- 13 Digital terminals (DIO0 to DIO7)
- 13 CJC sensors
- 13 Thermocouple connections
- 13 Wiring configuration
- 14 RTD and thermistor connections
- 14 Two-wire configuration
- 15 Three-wire configuration
- 16 Four-wire configuration
- 17 Semiconductor sensor measurements
- 17 Wiring configuration
- 17 Digital I/O connections
- 19 Functional Details
- 19 Thermocouple measurements
- 19 Cold junction compensation (CJC)
- 19 Data linearization
- 19 Open-thermocouple detection (OTD)
- 20 RTD and thermistor measurements
- 20 Data linearization
- 20 USB connector
- 20 Power
- 21 Specifications
- 21 Analog input
- 22 Channel configurations
- 22 Compatible sensors
- 23 Accuracy
- 23 Thermocouple measurement accuracy
- 23 Semiconductor sensor measurement accuracy
- 24 RTD measurement accuracy
- 24 Thermistor measurement accuracy
- 25 Throughput rate
- 25 Digital input/output
- 25 Memory
- 26 Microcontroller
- 26 USB +5V voltage
- 26 Power
- 26 USB specifications
- 27 Current excitation outputs (Ix+)
- 27 Environmental
- 27 Mechanical
- 28 Screw terminal connector type and pin out
- 28 Screw terminal pin out