Interface Specifications > I/O Cards

Thermocouple, mV

The DeltaV system supports the Thermocouple, mV card and the Series 2 Thermocouple, mV card in Simplex mode.

Installation Notes

Specifications

Table: Thermocouple, mV Specifications
Item Specification
Number of channels Eight
Sensor Types: mV Thermocouple Low level voltage source

B, E, J, K, N, R, S, T, uncharacterized

Isolation Each channel is optically isolated from the system and factory tested to 1500 VDC. Channels 1, 2, 3, and 4 are isolated from channels 5, 6, 7, and 8 (verified by 1500 VDC factory test). Thermocouples attached to channels 1, 2, 3,and 4 are not electrically isolated and should be within ±0.7 VDC of each other. Thermocouples attached to channels 5, 6, 7,and 8 are not electrically isolated and should be within ±0.7 VDC of each other.
Full scale signal range Selectable based on sensor type. Refer to Table: Thermocouple Sensor Type Specifications .
LocalBus Power Rating 12 VDC, 350 mA

Series 2 12 VDC, 210 mA

Ambient Temperature 0 to 60°C

Series 2 -40 to 70°C

Accuracy over temperature range (linearized) Thermocouple: Refer to Table: Thermocouple Sensor Type Specifications .

mV: Refer to Table: mV Sensor Type Specifications .

Cold Junction Compensation ±1°C
Resolution (Varies with sensor type. Refer to Table C-40 ). 16 bits
Repeatability 0.05% of span
DC/50/60Hz Common Mode Rejection 120 dB
Calibration None required
Mounting Assigned slot of I/O carrier

The following table shows specifications for the Thermocouple sensor types.

Note

In the 25° C Reference Accuracy column in the following table, total error is made up of reading accuracy, CJC accuracy, and sensor accuracy.

Table: Thermocouple Sensor Type Specifications

Sensor Type

Full Scale

Operating Range

25° C Reference Accuracy

Temperature Drift

Resolution

Uncharacterized (No linearization, no cold junction compensation.)

-100 to 100 mV

-100 to 100 mV

0.1 mV

±0.002 mV/°C

~ 0.003mV

B

250 to 1810°C

500 to 1810°C

±2.4°C

±0.056°C/°C

~ 0.18°C

E

-200 to 1000°C

-200 to 1000°C

±0.6°C

±0.008°C/°C

~ 0.07°C

J

-210 to 1200°C

-190 to 1200°C

±0.8°C

±0.011°C/°C

~ 0.05°C

K

-270 to 1372°C

-200 to 1372°C

±0.5°C

±0.016°C/°C

~ 0.18°C

N

-270 to 1300°C

-190 to 1300°C

±1.0°C

±0.007°C/°C

~ 0.10°C

R

-50 to 1768°C

-50 to 1768°C

±2.1°C

±0.013°C/°C

~ 0.14°C

S

-50 to 1768°C

-40 to 1768°C

±2.2°C

±0.067°C/°C

~ 0.24°C

T

-270 to 400°C

-200 to 400°C

±0.7°C

±0.001°C/°C

~ 0.04°C

The following table shows specifications for the mV sensor types

Table: mV Sensor Type Specifications
Sensor Type Full Scale Operating Range 25 ° Reference Accuracy Temperature Drift Resolution
Low Level Voltage Source -100 to 100 mV -100 to 100 mV 0.1 mV 0.002 mV/°C ~ 0.003 mV

Wiring Diagram

Figure: Wiring Diagram for Thermocouple, mV


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