Product Short Description
Product Name: Watlow CAS200 with CLS216 Option
Product Introduction: The Watlow CAS200 is a compact DIN rail temperature controller. The CLS216 variant is a specific configuration with a 1/16 DIN (96×48 mm) front panel, dual relay output, and universal input (thermocouple/RTD/mA/V), used for precision temperature control in industrial ovens, furnaces, and process heating.
Description
Model Series: Watlow CAS Series (Compact Advanced Controller)
Technical Specifications:
- Input Type: Universal (Type J, K, T, E, S, R, B thermocouples; Pt100, Pt1000, Cu50, Cu100 RTDs; 0–50 mA, 4–20 mA, 0–10 V)
- Control Output: Dual relay (SPDT), 5 A @ 250 VAC resistive
- Power Supply: 85–264 VAC / 90–300 VDC (universal)
- Accuracy: ±0.1% of reading + 1°C (typical)
- Sampling Rate: 250 ms
- Dimensions: 96 mm × 48 mm × 90 mm (1/16 DIN)
Functional Features:
- Auto-tuning PID: Relay method and step response auto-tune
- Alarm outputs: 2 programmable alarm relays (high/low)
- Retransmission: Isolated 4–20 mA retransmit output (optional on CLS216)
- Communication: RS-485 Modbus RTU (optional)
- Security: Password-protected parameter lock
Performance Parameters:
- Control resolution: 0.1°C (thermocouple), 0.01°C (RTD)
- Operating temperature: 0°C to +50°C (controller); -20°C to +80°C (with external sensor)
- IP Rating: IP65 (front panel with gasket)
- Electrical isolation: 500 VAC between input, output, and power
Material Composition: ABS/PC front bezel, polycarbonate rear housing, nickel-plated copper terminals, silicone keypad membrane
Structural Features: 1/16 DIN front panel with 4-digit LED display and 4 membrane buttons; screw terminals on rear for all connections; DIN rail clip included; IP65 gasket for panel cutout
Working Principle: The controller reads the temperature sensor input, compares it to the setpoint using a PID algorithm, and drives the dual relay outputs to control the heater (ON/OFF or time-proportional). The auto-tune function injects a relay oscillation to calculate optimal P, I, D values automatically.
Advantages:
- Universal input accepts any common sensor without hardware change
- Auto-tune eliminates manual PID tuning
- IP65 front panel suitable for washdown environments
Applicable Industries: Food processing, plastic molding, heat treating, laboratory ovens, pharmaceutical drying
Installation Requirements:
- Cut 92 mm × 45 mm panel hole for 1/16 DIN mounting
- Use thermocouple extension wire (matching type) from sensor to controller
- Configure input type and sensor range via front panel before first use
Usage Notes:
- Perform sensor calibration check annually
- Set alarm deadband to at least 2°C to prevent relay chattering
- Use shielded cable for RTD inputs (3-wire or 4-wire)
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