Watlow CAS 16CLS/CAS Multi-loop temperature controller
The Watlow Anafaze CAS 16CLS/CAS is a specialized multi-loop temperature controller and data acquisition module designed for demanding industrial environments.
Often used in high-precision thermal processes, this series is known for its compact DIN-rail design and robust performance.
1. Introduction
The CAS 16CLS (CAS refers to the “Compact Anafaze System”) is an advanced PID controller capable of managing up to 16 loops of control or 32 channels of monitoring.
It was engineered by Watlow Anafaze to bridge the gap between simple single-loop controllers and complex PLC-based systems.
It is primarily used where space is at a premium but precise thermal regulation and data logging are critical.
2. Technical Parameter Table
| Feature | Specification |
| Control Loops | Up to 16 Loops (Configurable) |
| Input Channels | 16 or 32 Differential Inputs |
| Input Types | Thermocouple (J, K, T, S, R, B, E, N), RTD, 0-5VDC, 4-20mA |
| Accuracy | $\pm 0.1\%$ of Span |
| Output Types | Digital (SSR Drive), Analog (4-20mA), Relay |
| Communication | EIA/TIA-232, EIA/TIA-485 (Modbus RTU) |
| Power Supply | 12 to 24 VDC |
| Operating Temp | 0°C to 50°C (32°F to 122°F) |
| Mounting | 35mm DIN-rail or Surface Mount |
3. Product Advantages and Features
High-Density Control: Manages 16 loops in a footprint significantly smaller than traditional panel-mount controllers.
Linear Scaling: Offers built-in linear scaling for non-standard sensor inputs, allowing for high flexibility with pressure or flow sensors.
Independent Tuning: Each loop features independent PID parameters and auto-tuning capabilities.
Modular Architecture: The CAS system often pairs with TB50 or TB18 terminal boards for clean, organized wiring.
4. Application Cases
Extrusion & Plastics: Monitoring and controlling multi-zone heat profiles on extruder barrels.
Semiconductor Processing: Precise wafer heating and chemical vapor deposition (CVD) environments.
Packaging Machinery: Managing heat seal bars across large, multi-lane production lines.
Environmental Chambers: Synchronizing temperature and humidity loops for stability testing.
5. Related & Other Models in the Series
The CAS/CLS family includes several variations depending on loop count and communication needs:
CAS200 Series: The direct successor/high-performance scanner version.
8CLS / 16CLS: Standard 8 and 16 loop versions.
CLS200: High-speed processing variant with enhanced data logging.
MLS Series: Earlier multi-loop systems (legacy).
CAS 16CLS/CAS
6. Installation and Maintenance
Installation
Mounting: Ensure the unit is snapped securely onto a 35mm DIN rail. Maintain at least 2 inches of clearance for airflow.
Wiring: Use shielded twisted-pair cables for sensor inputs to minimize EMI. For current inputs (4-20mA), ensure the appropriate precision resistors (typically 250Ω) are installed on the terminal board.
Grounding: Ensure the “Earth Ground” terminal is connected to a low-impedance industrial ground.
Maintenance
Megohm Testing: Periodically check insulation resistance on the heaters controlled by the CAS to prevent ground faults.
Calibration: While the unit is factory-calibrated, annual verification of input accuracy using a precision calibrator is recommended.
Firmware: Check for EPROM updates if utilizing legacy 16CLS models to ensure compatibility with modern Modbus masters.
7. Unique Product Description
“The Watlow CAS 16CLS/CAS is the ‘brain’ of the thermal loop, condensing the power of a control cabinet into the palm of your hand.
Its unique ability to process 32 channels of high-precision analog data while maintaining 16 independent PID loops makes it an indispensable asset for engineers who refuse to compromise between space-saving design and surgical thermal precision.”