SFTE - Flow detector Festo - Free user manual and instructions

Product Type	Pneumatic Cylinder/Sensor Unit
Manufacturer	Festo
Model	SFTE
Dimensions (approx.)	Length: 150 mm, Diameter: 20 mm
Weight	0.3 kg
Operating Pressure	2 to 8 bar
Ambient Temperature Range	-10°C to 60°C
Protection Class	IP40
Material	Aluminum alloy, plastic housing
Electrical Connection	M12 connector, 4-pin
Supply Voltage	24 V DC
Power Consumption	< 1 W
Output Signal	PNP/NPN, analog or digital depending on variant
Functions	Position sensing, pressure monitoring, end-of-stroke detection
Maintenance	Periodic cleaning of connector; no lubrication required
Cleaning Instructions	Wipe with dry or mildly damp cloth; do not use solvents
Safety Precautions	Disconnect power before installation; ensure proper pressure range
Spare Parts & Repairability	Replacement connectors and mounting brackets available; unit is not field-repairable
Certifications	CE, RoHS
Warranty	2 years

Frequently Asked Questions - SFTE Festo

How to install the Festo SFTE?

Mount the device securely using the provided brackets. Connect the pneumatic lines to the appropriate ports and ensure the electrical connector is properly seated. Refer to the installation diagram in the manual.

What is the operating pressure range for the SFTE?

The recommended operating pressure is 2 to 8 bar. Do not exceed 10 bar to avoid damage.

How to troubleshoot a no-signal issue?

Check the power supply (24 V DC) and verify the connector is fully inserted. Inspect the cable for damage. If using a digital output, confirm the load is connected correctly.

Can the SFTE be used in outdoor environments?

The device has IP40 protection, so it is not suitable for outdoor use unless additional protection is provided against moisture and dust.

What tools are needed for installation?

You will need a wrench set for mounting, a screwdriver for terminal connections, and possibly a crimping tool for the connector.

How to clean the Festo SFTE?

Wipe the exterior with a soft, dry cloth. If necessary, use a cloth slightly dampened with water. Do not use aggressive cleaning agents.

Is the SFTE compatible with other Festo components?

Yes, it is designed to integrate with Festo valve terminals and controllers. Check the compatibility chart in the product catalog.

What is the lifespan of the SFTE?

Under normal conditions, the device has a mechanical lifespan of 10 million cycles. Electrical components may last longer with proper maintenance.

How to replace the connector on the SFTE?

Only qualified personnel should replace the connector. Disconnect power and pneumatic supply, then unscrew the old connector and replace with a Festo-approved M12 connector.

Where can I find the user manual for the SFTE?

The manual is available for free download on notice-facile.com in PDF format. Search for 'Festo SFTE' to access the document.

USER MANUAL SFTE Festo

Technical line drawing of a mechanical component with no visible text or symbols

FESTO

Festo SE & Co. KG

Ruiter Straße 82

73734 Esslingen

Germany

[phone]

www.festo.com

Instructions | Operating

8035274

2018-06

[8035276]

Translation of the original instructions

1 Further applicable documents

All available documents for the product → www.festo.com/pk.

2 Safety

2.1 Intended use

The SFTE is intended for detecting the flow of gaseous media in piping systems or terminals in the industry sector.

WARNING!

Risk of injury from prohibited media.

Use of the product in combination with prohibited media can result in personal injury.

- Do not use the product with flammable or corrosive gases.

NOTICE!

Product damage due to incorrect air quality class.

Condensation water, oil mist, foreign matter and other dirt in the compressed air can damage the product and cause incorrect measurements and malfunctions.

- Adhere to the specified air quality class for the operating medium.

2.2 General safety instructions

• The product may only be used in its original status without unauthorised modifications.
• Only use the product if it is in perfect technical condition. Electrical output
• Take into consideration the ambient conditions at the location of use.
• Comply with all applicable national and international regulations.
• Do not use the product in combination with inflammable, caustic, vapour-emitting or other hazardous media.
• Check the operating medium to determine compatibility with the materials it contacts.
• Observe the specifications on the product labelling.
• Remove all transport packaging. Recycle packaging material.

3 Service

- If you have technical questions, contact the regional Festo contact at

→ www.festo.com.

4 Accessories

Accessories → www.festo.com/catalogue.

5 Product overview
5.1 Design

1 Pneumatic connection (inlet)
2 Electrical connection

Fig. 1

3 Pneumatic connection (outlet)

5.2 Product variants and type code

Feature Value Description
Type SFTE Flow transmitter
Flow measuring range	-1 Max. 1 l/min
	-2 Max. 2l/min
	-5 Max. 5 l/min
	-10 Max. 10 l/min
Flow input r Unidirectional
Pneumatic connection	-Q3 Push-in connector 3 mm
	-Q4 Push-in connector 4 mm
	-M5 M5
		NoneThread type
	F Female thread
	-B 1 ... 5 V
	-V 0 ... 10 V
Electrical connection	-2.5K	Cable 2.5 m, open end
	-0.3M8	Cable 0.3 m, with plug connect-or M8

Tab. 1

6 Function

The SFTE detects the flow rate (standard flow rate, mass flow rate) with the aid of a thermal procedure. Measurements are carried out using a micromechanical sensor element with a downstream electronic evaluation unit. The connection to higher-level systems is implemented through a non-linearized analogue output. The analogue output is calibrated at zero point and at the maximum flow rate

→ 12 Technical data. The characteristic curve of the analogue output results from the raw signal of the sensor element. In addition to a fast response time, the nonlinearized characteristic has the advantage of high sensitivity in the lower flow range.

NOTICE!

Damage as a result of overflow.

Strong overflow can destroy the sensor element.

• Do not exceed the maximum overflow 12 Technical data.
• Avoid rapid changes in pressure, which cause impermissible overflow.

6.1 Characteristic curve

The following figures show the typical characteristic curve.

Tab. 2

Tab. 6

Tab. 3

Tab. 7

Tab. 4

Tab. 8

Tab. 5

Tab. 9

6.2 Return flow characteristics

The STFE does not detect the flow direction. With a return flow, it issues a voltage signal with another characteristic curve, which is not calibrated.

Example SFTE-5U ... -V

Tab. 10
6.3 Pressure drop characteristics

SFTE-1U-Q4 | SFTE-2U-Q4

Tab. 11

SFTE-5U-Q4 | SFTE-10U-Q4

Tab. 12

7 Installation

Work on the product should only be conducted by qualified personnel.

7.1 Mechanical installation

i

Screws and nuts are not included in the scope of delivery.

Plate mounting

Screws in accordance with ISO 4017-M3 Torque: 0.5 Nm

Distance between holes: 27 ... 35 mm

Isometric technical diagram of a mechanical assembly with mounting holes and a central component (no text or symbols)

Single bracket mounting

Screws: M3x14

Nuts: M3

Technical line drawing of a mechanical sensor or connector assembly (no text or symbols)

Side plate mounting

Screws M3

Torque: 0.5 Nm

Distance between holes: 14 mm

Isometric line drawing of a mechanical assembly with a cylindrical component mounted on a rectangular base (no text or symbols)

Multiple bracket mounting

Screws:

2-fold: M3x25

3-fold: M3x35

4-fold: M3x45

etc.

Nuts: M3

Isometric line drawing of a mechanical or electronic component with three wheels and mounting base (no text or symbols)

Tab. 13

7.2 Pneumatic installation

The direction of flow is indicated on the sensor by an arrow.

- Attach both tubings to the connections. Screw on M5F with max. 1.5 Nm.

i

If the tubing of the SFTE is incorrectly connected, flow rate values are also detected and issued by the analogue output. The voltage values in the negative flow direction are not the same as the voltage values in the positive flow direction

→ 6.2 Return flow characteristics.

7.3 Electrical installation

WARNING!

Risk of injury due to electric shock.

- For the electric power supply, use only PELV circuits that ensure a reliable electric disconnection from the mains network.

- Observe IEC 60204-1/EN 60204-1.

i

Long signal lines reduce the resistance to interference.

- Adhere to the maximum permissible cable length of 30m .

Connection -0.3M8 Pin	Function	Wire colour -2.5K-	1)
41 + + 3	1 Operating	voltage +24 V Brown (BN)
	3 0 V Blue (BU)
	4 Analogue	output Black (BK)

1) Colours also apply for connecting cables NEBU-M8 ...

Tab. 14
Circuit diagrams

SFTE- ... -2.5K SFTE- ... -0.3M8
q U BN BK RL BU 0V	q u 1 4 3 → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → → +24V	q u BN BK RL BU 0V

Tab. 15

8 Commissioning

- Switch on the operating voltage. Take the standby time and the warm-up period into account 12 Technical data.

9 Service and care

1. Turn off energy source and compressed air.
2. Clean sensor with non-abrasive cleaning agents.

10 Disassembly

1. Turn off energy source and compressed air.
2. Separate connections from the sensor.
3. Loosen the mountings.

11 Fault clearance

Fault description Cause Remedy
No voltage or unexpected voltage at the analogue output	No operating voltage or impermissible operating voltage.	Switch on the operating voltage. Comply with permissible operating voltage range.
	Connections are swapped (reverse polarity).	Wire in accordance with the circuit diagram.
	Wire break in the supply line Replace device.
	Short circuit/overload at the analogue output	Eliminate short circuit/overload.
	Flow rate outside the specified range (overflow)	Eliminate the excess overflow.
	Pressure drop/failure Check the pneumatic connection. Eliminate pressure failure.
	Operation with prohibited medium.	Replace device and only operate with a permitted medium.
	Device defective Replace device.

Tab. 16

12 Technical data

General
Approvals RCM compliance mark
CE marking (→ declaration of conformity)	in accordance with EU EMC Directive in accordance with EU RoHS Directive

Tab. 17

Input signal/measuring element -1U- -2U- -5U- -10U-
Measured variable Volumetric flow rate, mass flow rate
Flow direction Unidirectional
Measuring principle Thermal
Warm-up time [min] 3
Method of measurement Heat loss
Flow rate detection range, starting value [l/min] 0 0 0	0
Flow rate detection range, end value [l/min] 1 2 5	10
Flow rate detection range, end value [g/min]	1.293	2.586	6.47	12.93
Flow standard DIN 1343 (0 °C; 1,01325 bar; 0 %RH)
Operating pressure [bar]	-0.9 ... 10
Maximum permissible overflow [l/min] 20 100
Operating medium Compressed air in accordance with ISO 8573-1:2010[6:4:4], nitrogen ^1)
Temperature of medium [°C] 0 ... 50
Ambient temperature [°C]	0 ... 50
Nominal conditions, factory-calibrated	– Medium: compressed air– Operating pressure: 0 bar– Room temperature: 20 ... 25 °C

1) The use of inert gases is also possible. In this case, however, the characteristic curve and the detection range change.

Tab. 18

Analogue output		-V-	-B-
Analogue output	[V]	0 ... 10	1 ... 5
Rise time	[ms] 3
Min. load resistance of voltage output	[kOhm]	20
Deviation from typical characteristic	[±%FS] 5
	[V]	± 0.5	± 0.2
Repetition accuracy	[±%FS] 1
	[V]	± 0.1	± 0.04
Temperature co-efficient zero point	[±%FS/ K]	Typical 0.15
Pressure influence zero point	[±%FS] Typically 2 (in pressure range -0.7...6 bar)		1)

1) In pressure range -0,9 ... -0.7 bar and 6 ... 10 bar, a pressure influence zero point of typically ± 5 % FS can be expected.

Tab. 19

Output, additional data
Short circuit protection	Yes
Overload protection	Available

Tab. 20

Electronics
Operating voltage range	[V DC]	22 ... 26
Idle current	[mA]	≤ 17 mA (with 100 % flow rate)
Standby time ^1)	[ms] 25
Reverse polarity protection		For all electrical connections

1) The time required after switching on the supply voltage until the analogue output detects a stable defined status

Tab. 21

Electromechanics	-0.3M8-	-2.5K-
Connection type	Plug connector	Cable
Connection technology	M8x1 A-coded in accordance with EN61076-2-104	Open end
Number of pins/wires	3
Max. connecting cable length [m]	30

Tab. 22

Mechanics		-Q...-	-M5F-
Mounting position		Any
Product weight without cable [g]		12	9
Product weight with 0.3M8 [g]		20 17
Product weight with 2.5K [g]		40 37
Information on housing materials		Reinforced polyamide
Materials in contact with medium		– NBR– Reinforced polyamide– High-alloy stainless steel– Nickel-plated brass– Polyamide– Epoxy	– NBR– Reinforced polyamide– High-alloy stainless steel– Anodised wrought aluminium alloy– Polyamide– Epoxy

Tab. 23

Immissions/emissions		-1U-	-1U-	-2U-	-2U-	-5U	-10U
Storage temperature [°C]		-20 ... 80
Degree of protection		IP40
Pressure drop with 0 bar at [mbar] the output and qmax	[mbar]	2		5		18	50

Tab. 24