1/8 DIN Vertical Temperature and Process Limit Controller

he CN2508 Series is part of a range of new generation series of limit controllers that incorporate numerous product specification, communication, display interface and software improvements that surpass competitive limit device offerings in ease of use and programming. By adding more versatile features and user-friendly functionality like digital inputs, an easy-to-use HMI, jumperless and auto-hardware configuration, 24 Vdc transmitter power supply and MODBUS® communication across the range, the CN2508 limit controller transform the complicated into the simple while saving you time (as much as 50% on product set-up), reducing inventory stock and virtually eliminating the likelihood of operator errors. The CN2508 limit controllers are affordable, wellfeatured, easy to use and adaptable with performance features that work for you to make limit control simple. The CN2508 is a fail-safe protection device to prevent damage to equipment or products. It will shut down a process when a preset temperature is reached and cannot be reset by the operator until the process has returned to a safe condition.

SPECIFICATIONS
Environmental Characteristics
Operating Temperature: 32 to 131°F (0 to 55°C)
Storage Temperature: -4 to 176°F (-20 to 80°C)
Humidity: 20 to 95% non-condensing RH Electrical
Supply Voltage: 100 to 240V, 50/60 Hz, optional 20 to 48 Vac 50/60 Hz or 22 to 65 Vdc
Power Consumption: 5 W/7.5 VA maximum Inputs
Thermocouples: J, T, K, L, N, B, R, S, C; Pt Rh 20% vs. Pt 40% Rh
RTD: 3-wire, PT100 DC linear (scalable -1999 to +9999)
Volts: 0 to 5V, 1 to 5V, 0 to 10V, 2 to 10V
DC Milliamps: 0 to 20 mA or 4 to 20 mA
DC Millivolts: 0 to 50 mV, 10 to 50 mV OUTPUTS
Output 1: (Limit relay) fixed
Outputs 2 and 3: (Alarm relay) are user-selectable and customized based on desired application
Choose From the Following Output Types Max # of Outputs: 3 for alarm, 24 Vdc transmitter power supply or retransmit of process value/limit trip setpoint
    Limit Relay: SPDT; 240 Vac, 5 A resistive; lifetime >100,000 operations at rated voltage/current
    Alarm Relay: Optional SPDT; 240 Vac, 2 A resistive; lifetime >500,000 operations at rated     voltage/current
    SSR Drive (Optional Drive Capability): >10 Vdc nominal into 500 Ω minimum
    DC Linear: Optional 0 to 20 mA, 4 to 20 mA     into 500 Ω max; 0 to 10V, 1 to 5V, 2 to 10V, 0 to 5V into 500 Ω min; outputs have 2% over/under drive applied; accuracy ±0.25% (mA into 250 Ω load, V into 2k Ω load); degrading linearity to ±0.5% for increasing burden to specified limits
    Triac: Optional 0.01 to 1A AC, 20 to 280 Vrms, 47 to 63 Hz (limit 2)
Transmitter Power Supply: Optional 24 Vdc (limit 1)
Output Functions
Process Alarm: Reverse or direct
Modes (Alarm 1 and 2): High/low, band, deviation, logical OR/AND
Retransmit: Process value or limit setpoint
Electrical Performance
Accuracy: ±0.1% of input range ±1 LSD (thermocouple CJC better than 1°C)
Input Sample Rate: 4 per second, 14-bit resolution
Impedance: >10M Ω for the thermocouple and mV ranges, 47 kΩ for V ranges and 5 Ω for mA ranges
Sensor Break Detection: <2 seconds (except zero based DC ranges), limit output opens, low alarms activate for RTD, mA or V ranges
Communications Interface
User-Selectable: 2-wire, RS485 serial communications option with choice of MODBUS RTU or ASCII protocol; 1200 to 19200 baud
PC Configuration: Offline configuration from serial port to dedicated configuration socket (comms option not required)
Protection
IEC IP66 (NEMA 4X): Front panel
IEC IP20: Behind the panel protection
Dimensions
Panel Cutout: 45 W x 92 mm H (1.77 x 3.62")
Height: 96 mm (3.77")
Width: 48 mm (1.89")
Depth: 100 mm (3.94")
Weight: 0.21 kg (0.46 lb)
Mounting: Plug in panel with fixing strap