LS Thermocouple / mV input CHARM specifications

Installation notes

The LS Thermocouple / mV input CHARM requires the CHARM Thermocouple / mV Terminal Block.
Cold Junction Compensation for the CHARM is built into the terminal block.
Color coding for thermocouple wires varies from country to country. Refer to your local standards for the appropriate color code.
At rates of temperature change greater than 126 °C/s, the CHARM may temporarily indicate an open loop.

Specifications

Table: LS Thermocouple / mV Input CHARM specifications
Item	Specification
Channel type	Thermocouple input
Sensor types	Thermocouple: B, E, J, K, N, R, S, T, uncharacterized mV: Low level voltage source (±20 mV, ±50 mV, and ±100 mV.
Full scale signal range	Depends upon Thermocouple sensor type. Refer to Table: LS Thermocouple sensor type specifications
Accuracy over full scale temperature range	Depends upon Thermocouple sensor type. Refer to Table: LS Thermocouple sensor type specifications
Repeatability	0.05% of span
Resolution	Depends upon Thermocouple sensor type. Uses 24-bit A/D converter. Refer to Table: LS Thermocouple sensor type specifications
Calibration	None required
Cold Junction Compensation (CJC) accuracy	±1.0 °C
Cold Junction Compensation range	-40 °C to 85 °C
Open sensor detection	Yes
DC/50/60Hz common mode rejection	90 dB typical
Channel isolation	TC sensor input is galvanically isolated and factory tested to 1000 VDC.
Input power requirements	Total power requirement: +24 VDC ±10% at 18 mA maximum : Input power from CSLS Power Modules: +6.3 VDC ±3% at 20 mA maximum +24 VDC input power: ±10% at 10 mA maximum
CHARM heat dissipation	0.30 W

Note

In the 25 °C reference accuracy column in the following table, total error is made up of the 25 °C reference accuracy value, plus the CJC accuracy value, plus the sensor accuracy value.

Table: LS Thermocouple sensor type specifications
Sensor types	25°C reference accuracy	Temperature drift	Nominal resolution	Full scale	Operating range
B	±0.8 °C	±0.06 °C/°C	0.024 °C	0 to 1820 °C	250 to 1820 °C
E	±0.4 °C	±0.03 °C/°C	0.018 °C	-270 to 1000 °C	-200 to 1000 °C
J	±0.6 °C	±0.04 °C/°C	0.022 °C	-210 to 1200 °C	-210 to 1200 °C
K	±0.4 °C	±0.03 °C/°C	0.025 °C	-270 to 1372 °C	-200 to 1372 °C
N	±0.6 °C	±0.04 °C/°C	0.024 °C	-270 to 1300 °C	-200 to 1300 °C
R	±0.8 °C	±0.05 °C/°C	0.028 °C	-50 to 1768 °C	-50 to 1768 °C
S	±0.8 °C	±0.05 °C/°C	0.028 °C	-50 to 1768 °C	-50 to 1768 °C
T	±0.5 °C	±0.02 °C/°C	0.01 °C	-270 to 400 °C	-200 to 400 °C
±100 mV	±0.025 mV	0.002 mV/°C	0.0031 mV	±100 mV	±100 mV
±50 mV	±0.020 mV	0.001 mV/°C	0.0015 mV	±50 mV	±50 mV
±20 mV	±0.010 mV	0.0005 mV/°C	0.0006 mV/°C	±20 mV	±20 mV

Wiring diagram

Figure: LS Thermocouple / mV input CHARM wiring diagram

Related information

CHARM Thermocouple / mV Terminal Block specifications