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Thermal Flow Sensor - TFS-35

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• Supply voltage: 12 - 34 V DC
• Flow rate range: 1 to 150 cm/s (for water)
• Temperature gradient: < 250 K/min
• Response time: 2 to 15s
• Ambient working temperature range: -20 ~ +80°C
• Settings made by magnetic pen
• Stainless steel case

Model Number: TFS-35
Data Sheet:

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Product Specification

TFS-35 Thermal Flow Sensor

For sensing limit flow rates of fluid media and for monitoring their temperature.
• These sensors are intended for installation in pipes, in which the actual monitoring of the flow rate and temperature occurs
• Flow rate measurement is shown in a bar graph by five green LED diodes and in the same graduation it is possible to select the limit for output switching (unswitching)
• Optical indication of the flow rate and temperature status via two LEDs
• Settings made by magnetic pen
• Stainless steel case

Thermal flow sensor - TFS-35 is a compact measuring device intended for industrial use for sensing limit flow rates of fluid media and for monitoring their temperature when installed in the pipe. The sensor may be installed in plastic and metal pipes. Suitable for monitoring filling, cooling or lubricating media and their temperatures. Flow rate is indicated by means of a bar graph (5 green LEDs). Output (flow rate and temperature) switching indicator by means of LED (orange and yellow). Simple configuration using a magnetic pen. Sensor is made in a stainless steel design. Quick and simple installation thanks to simple construction.

Thermal flow sensor TFS-35 Dimensional drawings

Thermal flow sensor TFS-35 Basic technical data

Work environment ( ČSN EN 60079-10-1)		no explosive hazard area
Supply voltage		12 ... 34 V DC
Power consumption	for power voltage 12 V DC 15 V DC 18 V DC 24 V DC	max. 100 mA DC max. 80 mA DC max. 70 mA DC max. 60 mA DC
Output	flow rate temperatures	PNP PNP
Maximum switching current		300 mA
Maximum residual voltage in ON state		1.5 V
Temperature output - switching points		15°C; 30°C; 45°C; 60°C; 75°C;
Flow rate range		1 to 150 cm/s (for water)
Temperature gradient		< 250 K/min
Isolating capacity (housing - inputs) / dialectric strength		4 nF / 500 V AC
Protection		IP67 (design C) IP68 (design A, B, V, H)
Ambient working temperature range (ta)		-20 ... +80°C

Power cord	PVC 4x 0.5 mm²
Heat up time after start	10s
Response time	2 to 15s
Pressure strength	10 MPa ( 100 bar ) over full temperature range
Weight of sensor (without cable)	150 g

Thermal flow sensor TFS-35 Used materials

part of the sensor	type	standard material
Housing	all	stainless steel W.Nr. 1.4404 (AISI 316L)
End of sensor	all	stainless steel W.Nr. 1.4301 (AISI 304)
Cable terminal	TFS-35_-_ _- _- _ _ _ _- A- L_ _ TFS-35_-_ _- _- _ _ _ _- B- L_ _ TFS-35_-_ _- _- _ _ _ _- V- L_ _ TFS-35_-_ _- _- _ _ _ _- H-L _ _	stainless steel W.Nr. 1.4571 / NBR plastic PA / NBR plastic PA / NBR plastic PA / NBR
Connector M12	TFS-35_-_ _- _- _ _ _ _- C-L _ _	nickel-plated brass /

Thermal flow sensor TFS-35 Process connection

name	dimensions	marking
pipe thread	G 1/2''	G 1/2

Thermal flow sensor TFS-35 Part number

Thermal flow sensor TFS-35 Correct specification examples

TFS-35N-10-G1/2-PFPT-A-L20 cable 2 m (N) configuration for normal areas; (10) non-insulated cylindrical, (G1/2) process connection with thread G1/2", (PFPT) PNP type flow rate and temperature sensing terminals, (A) stainless steel cable terminal, (L20) length of stem 20mm. cable 2 m)
TFS-35N-10-G1/2-PFPT-C-L20 (N) configuration for normal areas; (10) non-insulated cylindrical, (G1/2) process connection with thread G1/2", (PFPT) PNP type flow rate and temperature sensing terminals, (C) M12 connector), (L20) length of stem 20mm.
TFS-35N-10-G1/2-PFPT-B-L20 cable 12 m (N) configuration for normal areas; (10) non-insulated cylindrical, (G1/2) process connection with thread G1/2", (PFPT) PNP type flow rate and temperature sensing terminals, (A) plastic cable terminal, (L20) length of stem 20mm. cable 2 m)