Overview
The Kobold KAL-4340S thermal flow switch is a compact, solid-state flow monitoring device engineered for sanitary process applications requiring precise liquid flow detection. This microprocessor-controlled flow switch is designed for use in monitoring and control applications involving moderate flow rates of non-viscous or dirty liquids. The KAL-4340S integrates switching electronics directly into the probe assembly, eliminating the need for external control modules and simplifying installation in confined spaces.
Key Features
- Uses thermal dispersion principle with an internally heated probe; flow rate is determined by the measured rate at which heat is removed from the probe
- Solid-state design with no mechanical components, eliminating wear-related failures common in paddle or flap style flow switches
- Incorporates an 8-segment bar-graph LED flow trend indicator and one flow alarm setpoint
- Temperature-compensated design maintains accurate flow detection from 32°F to 250°F, with CIP compatibility up to 280°F without operating cleaning cycles
- Sanitary version with 316L stainless steel construction and 1-1/2 inch Tri-Clamp fitting
- Compact probe creates extremely low pressure loss in the system while remaining insensitive to dirt and particulate matter
Technical Specifications
- Measurement Principle: Thermal dispersion with internally heated probe
- Switching Range: 0.05–2 m/s
- Fluid Media: Water-based liquids, 60 cSt max viscosity
- Response Time: 5.6 seconds typical; 1.2 seconds optional with “F”
- Operating Temperature: 32°F to 250°F; CIP 280°F max
- Maximum Pressure: 1450 PSIG
- Connection: 1-1/2 inch Tri-Clamp sanitary fitting
- Housing: NEMA 4 Nylon enclosure
- Wetted Materials: 316L stainless steel for sanitary Tri-Clamp version
- Power Supply: 24 VDC ±10%, 300 mA
- Switch Type: Normally-open (N/O) PNP or NPN open collector for 24 VDC units; rated 400 mA @ 24V DC
- Flow Indicator: 8 Red LED trend display; bi-colored status LED
- Adjustment: Potentiometer-based field calibration
Typical Applications
The KAL-4340S is ideal for continuous monitoring in industrial water systems, cooling circuits, and many other process applications. Common uses include:
- Pharmaceutical and beverage manufacturing flow verification
- Chilled water loop monitoring in HVAC systems
- Cooling jacket flow detection in heat exchangers
- Process water supply continuity checks
- Sterile/CIP-compatible circuit monitoring
Compatibility & Replacements
Compatible With
- 24 VDC control systems and PLC inputs (discrete DC logic)
- Process automation platforms requiring flow alarm inputs
- Sanitary-rated piping systems with Tri-Clamp connections
- Industrial water treatment and cooling systems
- CIP (Clean-in-Place) systems up to 280°F
Replaces / Drop-In Replacement For
- Other KAL-4000 Series models (KAL-4215, KAL-4315, KAL-4320) where sanitary Tri-Clamp construction is specifically required
- Verify compatibility with your system integrator before ordering.
Works With
- 24 VDC logic circuits and discrete PLC inputs
- Relay modules activated by open-collector output
- AC relay switching for loads exceeding DC transistor rating (up to 5A @ 240 VAC with external relay)
- SCADA systems and HMI platforms supporting discrete flow alarm inputs
- Building management systems (BMS) for facility automation
