The Series SC1290 & SC1490 Thermocouple Limit/Alarm Switch Modules are on-off or limit switches with selectable process signal, thermocouple, or RTD inputs. Input type, scale range, output action, and output type are all selectable by the user in the field. All selections are made through easily accessible switches without the need to open the product.

Each unit has two form C (SPDT) relays which can operate independently, or be logically connected to operate as a DPDT output. A two color LED indicator indicates the status of each output relay.

These units mount easily on a standard 35 mm DIN rail. Low Voltage (SCLXXXX) units are also available.

SPECIFICATIONS
Power Supply: (SC units) 85 to 265 VDC/VAC 50 to 400 Hz (12-24 VDC, VAC 50-400 Hz for Low Voltage Option, SCL units).
Isolation: 1500 V rms between outputs, input, and power.
Set Points: Adjustable 0 to 100% of span.
Deadband: Adjustable 0.25 to 100% of span.
Drift: ±0.02%/°C typical ±0.05%/°C maximum.
Ambient Temperature Range: (Operating) 32 to 131°F (0 to 55°C). (Storage) -40 to 176°F (-40 to 80°C).
Excitation Current: (SC1490) Cu10O = 5 mA; Plt 100O, Ni 100O,Ni 120O = 500µA; Plt 500O, NiFe 1000O = 100 µA; Plt 1000O = 50 µA.
Lead Compensation Error: (SC1490) = 0.02%/O.
Open Lead Protection: (SC 1490) Upscale only.
Input Impedance: (1290) 3 megohms.
Sensor Burnout Protection: Selectable, upscale or downscale on 1290.
Relay Output: Form C, SPDT, one per set point, 5A @ 250 VAC, resistive.
Latch Circuit Reset: Automatic at power up. Manual with reset switch on front of module.
Indicators: One dual color LED per set point. Red = relay on, green = relay off.
Wiring Terminals: Screw driven compression type.
Dimensions: 2.95" H x 0.89" W x 3.89" D (75 x 22.5 x 98.5 mm).