Flow Switch

• No Moving Parts
• Switching Range 0.15 to 6.6 Ft/Sec.
• Max. Pressure 580 PSIG
• Max. Operating Temperature 210°F
• Clean-In-Place to 250°F
• ¼ or ½ NPT or BSP connection
• PNP Normally Open or Normally closed
• LCD Trend Indication
• Adjustable Set Point
• Small Footprint (less than 2” diameter)

The KAL-D series combines the features of our legendary KAL-K thermal flow switch with a compact size. The KAL-D uses the calorimetric principle to monitor the flowrate of non-viscous water-based liquids. The sensor tip is heated to a few degrees above the liquid temperature. As the liquid flows across the tip, it is cooled by the liquid.

The amount of cooling is proportional to liquid velocity. The liquid velocity is compared to the setpoint which is field-adjustable by the user. A transistor switch is activated when the flow setpoint is reached. The KAL-D series has a smooth measuring probe with no moving parts making it exceptionally reliable and insensitive to dirt and solids. The insertion type probe allows for flow monitoring with minimal system pressure loss.

Microprocessor-Based Temperature Compensation
The KAL-D series achieves superior compensation for changes in liquid temperature during the measuring cycle by use of a microcontroller. This method of temperature compensation allows for very precise correction of flow measurement when liquid temperature changes occur.

•  Mass flow Switch for the detection of the mass flow rate of liquids and gases 
• Range of 0.01 to 5 sfps (.003 to 1.524 smps) in liquids and 0.1 to 500 sfps (.03 to 152.4 smps) gases.
• Fast response time of 0.5 to 10 seconds (media dependent) 
• Wide operating temperature range of -100F to +390F (-70C to 200C)
• Operating Pressure: to 3000 psia (207 bar)
• CE, CENELEC and CSA approval
• Repeatability: +/- 1% of set point (Flow) or 1/32" (0.8mm) Level
• Stability:  Drift <0.5% from calibrated set point over a range of +/-50F 
• Temperature compensated through entire range
• Enclosure: Explosion Proof; NEMA 3, 4X, 7, 9. CSA, FM, UL, CENELEC and EECS approved
• Process Connection: 0.75" MNPT standard. 0.5" and larger MNPT and various other process connections such as sanitary and flanges optional
• Insertion Length: 2.0" standard. 0.5" or greater optional
• Input Power: 115 VAC, 50/60Hz standard. 230 VAC, 50/60Hz optional, 24VDC optional. 3.1 Watt maximum
• Output: 5A. 250 VAC. DPDT with fail safe capability

• Full scale flow ranges from 60cc/m to 40 GPM and 4 SCFM to 400 SCFM
• Connection sizes from 1/4-inch to 1-inch NPT or BSP
• Construction materials: Brass or Stainless Steel
• Spring loaded, mechanical design mounts in any orientation
• Calibrated scale for easy field adjustability
• Pressure ratings to 4500 PSIG
• Maintains accuracy regardless of viscosity fluctuations
• Optional field adjustable switches

Special Features:

• Compact flow-monitor for gaseous media.
• N o moving parts.
• Long life irrespective of switching frequency.
• Simple installation with mounting flange, pipe adapter optional.
• Switching point adjustable between 0,5 and 20 m/s.

Sensing Data :

• Medium : gaseous
• Switching range : adjustable from 0,5 m/s to 20 m/s*
• Adjustment characteristic : logarithmic to flow speed
• Repeatability tolerance of set-point : < 3%
• Hysteresis : < 20 %
• Switching delay : approx. 2 s with change of flow more than 2 m/s below or above set-point
• Temperature drift : < 0,3 % / K

General Description

The vent-captor type 3202.- is a solid-state flow-monitor for air or gaseous media in a wide variety of industrial applications. Being totally encapsulated in epoxy resin with no moving parts, this small, compact unit operates with high precision and high repeatability in harsh industrial environments. The construction and design of the vent-captor ensures a long, maintenance-free life

vent-captor air flow-monitors are used to monitor air flow in a wide variety of industrial applications for air or gasous medium e. g. air conditioning, ventilation, air filter monitoring, extraction fans, blowers, damper regulators and controlling air flow rates in energy conservation systems. The vent-captor is also ideal for monitoring air flow in thyristor cabinets, motor/generators and shipping containers.