There are a number of ways in which sensing devices may be classified:
A range of proximity detectors with built in amplifiers and solid state output stages making them extremely versatile electronic switches These sense the presence of non-conducting materials such as wood, PVC, glass etc. as well as ferrous and non-ferrous metals. All types have built in potentiometers for sensitivity adjustment and LED indicators. Applications include batch counting alarm systems limit switching etc.
A miniature inductive proximity detector housed in a threaded anodised aluminium cylindrical case with integral 3-core PVC sheathed cable. Environmental protection to IP 67. The device incorporates electrical protection against reverse polarity, supply line and load transients and has a current limiting PTC resistor in the load output.
A high quality proximity switch operating on the principle of the emission detection of modulated infra-red light. This mechanically and electrically rugged unit is housed in a threaded aluminium case with a glass end-window and has many applications where any material is required to be detected at a range far exceeding that associated with conventional proximity devices.
A platinum wire (pellistor) flammable gas sensor that is designed to sense such gases as propane, butane, methane, isobutane, liquefied petroleum gas, natural gas, and town gas. The performance of the sensor is stable against change of ambient temperature and humidity. Bridge supply voltage 3V dc ±10%.
An ultrasonic transmitter and high sensitivity receiver designed for sending and receiving continuous or modulated waves in the 40kHz region through air. Applications include remote-control systems, batch counting data transmissions etc. Typical operating distance 5m. Note: These units are not watertight.
General Purpose foil type polyester-backed strain gauges. Available with temperature compensation for steel or aluminium.
SLOTTED OPTO SWITCH
A slotted opto switch comprising an infra-red source and integrated photo-detector The i.c photo-detector consists of a photo-diode, amplifier, voltage regulator, schmitt trigger and output stage. An important feature is its' wide supply voltage range 4.5V to 16V, which allows the output to interface directly to TTL, LS/TTL, and C-MOS. The detector can sink 10 TTL loads when the infra-red beam is interrupted. The outtput rise and fall times are independant of object speed and the integrated voltage regulator ensures high noise immunity. Applications include position detection, paper sensing, counting, optical encoding and level sensing. Operating temperature range: -40 C to +100 C.
REFLECTIVE OPTO SWITCH
An infra-red emitting LED and photo-transistor sensor housed in a moulded package. The photo-transistor responds to radiation from the diode when a reflective object is placed within the field of view. The device is ideal for counting shaft revolutions, line counting on paper tapes etc.. The moulded case incorporates a dust cover and infra-red filter to prevent the ingress of dust and ambient illumination problems. A slotted mounting hole alllows for adjustment to the sensing distance.