Coolguard Type 4100 - Flow Switch


  • Low Cost Flow Switch with no moving parts
  • Simple to Install in a pipe T
  • Monitors both Flow and Temperature


The safe sensing solution for industrial cooling systems. The flow-captor CooLGUARD utilizes the weber pioneered calorimetric principle and the All-In-One monitoring of flow and temperature of the coolant

CooLGUARD is especially designed, for all types of cooling systems, as a reliable alternative to failure prone mechanical flow switches.



Technical Data
Type: 4100
Medium: Water based liquid
Sensor Data
Low Flow Set Point :0.4 m/s (1.2 fps) (water related) typical
Hi Temp Set Point: 50° C (122° F) or 70° C (158° F), other settings possible on OEM demand
Medium temperature: -20° C (-4° F) to + 80° C (176° F)
Response time: <30 seconds
Repeatability: < .05 m/s
Hysteresis: <30% of setpoint value
Pressure: 10 bar (150 PSI)
Mechanical Data
Protection class: IP 67 (NEMA6)
Housing Material: Stainless Steel 1.4301 (303)
Thread: G ½ A (BSP) or ½ “ –14 NPT (NPT)
Connection: M12 male socket, 4 pin + 2m connection cable with M12 connector
Electrical Data
Operating voltage: 18 to 30 V DC
Switching current: ≤ 200 mA
Power Consumption: 4 W max.
Initial Operation: after 15 seconds
Electrical Output: PNP n.o. (switch closed with flow)



Part Number Key:
4100-X-Y-Z A
X= Temp Setpoint (°C),
Y= Flow Set Point (m/s), 
Z= Sensor Head Length, 
A= Thread code:

Example: 4100-70nc-.3no-EXT BSP 

code: 50nc or 70nc
code: .3no
code: none or EXT
code: BSP or NPT


Coolguard Type 4100 - Flow Switch


Coolguard Type 4100 - Flow Switch