Overview
The Kobold KAL-4340S thermal flow switch is a compact, microprocessor-controlled flow switch designed for use in monitoring and control applications involving moderate flow rates of non-viscous or dirty liquids. This sanitary model features 316-Ti stainless steel construction with a 1½” Tri-Clamp fitting, making it ideal for pharmaceutical, food and beverage, and sanitary process applications where corrosion resistance and easy disassembly are critical.
Key Features
- Uses the proven thermal dispersion principle with a probe heated internally to a few degrees above the temperature of the medium
- Incorporates an 8 segment bar-graph LED flow trend indicator and one flow alarm setpoint, fully configurable as NPN, PNP, normally-open or normally-closed
- Microprocessor can be field calibrated to users’ liquid properties and operating range in a simple, five minute set-up procedure
- No moving parts design eliminates wear and reduces maintenance
- N/O contact configuration with cable gland and ½” NPT connection, powered by 24 VDC
Technical Specifications
| Model | KAL-4340S |
| Measurement Principle | Thermal Dispersion |
| Wetted Materials | 316-Ti Stainless Steel (Sanitary) |
| Fitting Type | 1½” Tri-Clamp (Sanitary) |
| Connection | ½” NPT, Cable Gland |
| Switching Range | 4 – 200 cm/s |
| Operating Temperature | -20 °C to +80 °C (-4 °F to 176 °F) |
| Max. Pressure | 100 bar (1450 PSIG) |
| Response Time | Typical 5.6 seconds |
| Power Supply | 24 VDC ±10% |
| Current Draw | 300 mA maximum |
| Output | Normally-Open Contact |
| Protection Rating | IP 68 |
| Cable | 2 × 0.56 mm², length 2 m, max. line length 100 m |
| Media Compatibility | Non-viscous to moderately viscous liquids (water-based, max. 60 cSt) |
Typical Applications
The KAL-4340S is commonly used in sanitary and hygienic process environments including:
- Food and beverage processing and packaging
- Pharmaceutical manufacturing and filling operations
- Water treatment and wastewater monitoring
- Chemical processing and circulation loops
- Cooling and chilled water systems
- Clean-in-place (CIP) system monitoring
Compatibility & Replacements
Compatible With
- Standard industrial 24 VDC control systems and PLC inputs
- Normally-open relay and switching circuits
- Line voltage up to 110 VAC (optional configuration)
- Systems supporting IP 68 rated sensors
- CIP (Clean-in-Place) system architectures
Replaces / Drop-In Replacement For
The KAL-4340S specifically refers to the sanitary 316-Ti stainless steel configuration with 1½” Tri-Clamp fitting. Standard NPT versions include KAL-4340 and KAL-4315. Verify fitting and material specifications before ordering a replacement, as KAL-series models are available in multiple configurations.
Works With
- NEMA 4 rated control enclosures
- 24 VDC power supplies rated for 300 mA continuous draw
- Sanitary hygienic design systems per 3-A standards
- Industrial automation control networks
- Analog I/O modules and relay output cards
