Description         Features         Applications         Specifications         Typical Connections

The module uses an electronic circuit to detect when an electrically conductive object comes in direct or near contact with the module's "cap" input.  A human, touching a metal button or approaching a metal sensing plate connected to the cap input, increases the capacitance between the module and a nearby earth ground.

When the capacitance exceeds a specific level, the module circuit activates a transistor switch. Every 30 seconds the module automatically calibrates itself for maximum sensitivity.  The typical capacitance sensitivity change is about 5 picofarads.  A three position jumper sets the installed capacitance for 100pF, 200pF or 300pF of total capacitance.

• QTFS3X is powered by an external supply ranging from 3v to 24v  

• 100% solid-state circuitry 

• True capacitance sensing, not “Hum”

• High capacitance sensitivity

• 5pF capacitance change detection

• Transistor switch output, 1 amp, 30v

• Excess of 10 million operations

• Screw type terminals for easy wiring

• Adhesive pad mounting (standard)

• Cases with mounting feet (optional)

Also available with LED indicator light. 
Ask for model QTFS3X-L

• Replacement for pushbuttons.

• Finger touch activated.

• Hand, arm or foot proximity

• Hidden behind walls or floors

• Vandal-proof and weatherproof

• Interactive museum displays

• Automotive touch activated.

• Jail light or intercom controls

• Liquid level monitors

• Animal detection

• Robotics PLC interface sensors

• Material handling monitors

Enclosure = 1.0”W x 1.0”L x 0.75”H

Electrical Connections = 5 screw barrier type terminal block

Supply voltage range = 3v24v

Typical Supply Current = 30uA, 100uA for the QTFS3X-L model containing a LED indicator light

Minimum Momentary Output Switch Pulse Length = 100mS

Minimum Capacitance change duration for switch detection = 50mS

Minimum Capacitance change needed to activate switch = 5pF, self-calibration every 30 sec

Maximum Installed Capacitance  = 350pF

Output Switch = normally open, sink current

Maximum Switch Current = 1 amp

Maximum Switch Voltage (sinking output) – 30v

Operating Temperature = -40C+60C

Switch Life = excess of 10 million operations