Channel Configurations; Compatible Sensors: T0X Tot3X - Omega OM-USB-TC-AI User Manual

OM-USB-TC-AI User's Guide
Parameter
Common mode rejection ratio
ADC resolution
ADC No missing codes
Input coupling
Warm-up time
Open thermocouple detect
CJC sensor accuracy

Channel configurations

Channel Category
T0x to T3x Disabled
T0x to T3x Thermocouple
Note 1
V0x to V3x Disabled
V0x to V3x Differential
Note 2
V0x to V3x Single-ended
Internally, the OM-USB-TC-AI has four, dual-channel, fully differential A/Ds providing a total of
Note 1:
eight input channels.
Note 2: When connecting differential inputs to floating input sources, you must provide a DC return path from
each differential input to ground. To do this, connect a resistor from each of the differential inputs to
GND. A value of approximately 1Meg ohm can be used for most applications.
Note 3: Channel configuration information is stored in the EEPROM of the isolated microcontroller by the
firmware whenever any item is modified. Modification is performed by commands issued over USB
from an external application, and the configuration is made non-volatile through the use of the
EEPROM.
The factory default configuration is Disabled. The Disabled mode will disconnect the temperature and
Note 4:
voltage inputs from the terminal blocks and internally connect ground (GND) to all of the A/D inputs.

Compatible sensors: T0x toT3x

Parameter
Thermocouple
Conditions
T0x to T3x, f = 60 Hz
IN
V0x to V3x, f = 60 Hz, all
IN
input ranges
T0x to T3x
T0x to T3x, 15 °C to 35 °C
T0x to T3x, 0°C to 70 °C
Table 2. Channel configuration specifications
Conditions
All temperature input channels are disconnected from screw
terminals and internally connected to GND.
All voltage input channels are disconnected from screw
terminals and internally connected to GND.
Table 3. Compatible sensor type specifications
Conditions (°C)
J: –210 to 1200
K: –270 to 1372
R: –50 to 1768
S: –50 to 1768
T: –270 to 400
N: –270 to 1300
E: –270 to 1000
B: 0 to 1820
18
Specification
100 dB
83 dB
24 bits
24 bits
DC
30 minutes min
Automatically enabled when the channel pair is
configured for thermocouple sensor.
The max open detection time is 3 seconds.
±0.25 °C typ,±0.5 °C max
–1.0 to +0.75 °C max
Specifications
Specification
See Note 4
4 differential channels
See Note 4
4 differential channels
4 single-ended
channels