CN2508 Series
1/8 DIN Temperature/Process Limit Controllers
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Dual Display
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Universal Input
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High/Low Limit
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Limit Relay Output (Fixed)
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Additional Modular Outputs (Optional)
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RS485 (Optional)
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Digital Input Remote reset (Optional)
Description
This product series is no longer available. For potential replacements please see
CN-4000-Series
Please consult an application engineer for a more specific recommendation.
The 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
† All amounts shown in EUR, GBP, or USD
Note: Comes complete with mounting bracket and operator’s manual.
Ordering Example: (1) CN2508-R1 Single output, relay, £755.86
Product Manuals:
Download
CN2504-CN2508-CN2516 - Limit Controllers
Download
CN2516-CN2508-CN2504 - Temperature Controllers
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