Polaris PI16 & PS Non-contact Infrared Heat Switch
To satisfy the increasing demand of our customers, the Polaris line of infrared switching units was designed to meet the requirements for a cost-efficient but accurate switching device for the recognition of hot parts. For the precise detection of bright metal parts, the near end spectral sensitivity of the unit is important because the infrared energy radiated by such surfaces grows weaker as wavelength increases. Simultaneously, the impact of emissivity deviation on accuracy is much lower in the near end infrared zone.
The units are exceptionally robust due to the fact that the measuring process is performed without mechanically moving parts and because the electronics are housed in a stainless steel cabinet. By utilising the digital signal process, the Polaris line exceeds standard analogue pyrometers in terms of precision and repeatability.
Lenses:
The infrared energy radiated by the target is centred directly on the detector by focusable lenses. Lenses are made of BK7, an optical glass. If additional windows are necessary, they should offer similar optical characteristics.
Optical Alignment:
The optical alignment of the switching device on the measured object is facilitated by precise laser marking which indicates the centre of the measured spot. The optical axis is aligned with the mechanical axis of the sensor housing.
Switching Points:
The built-in detector within the infrared Polaris device creates a signal proportional to the infrared radiation. This is converted by a microprocessor into a temperature reading, and compared with the pre-set switching points. Two switching points can be set independent of each other. The hysteresis of the two switching points is programmable in addition to the switching behaviour itself. One can configure the device such that the switch is activated/deactivated when the temperature rises or when a certain temperature is exceeded, and choose to store this procedure should the temperature fall short (temperature decline) of the same temperature value (or of a second, lower temperature value). Polaris supply voltage is available from the two output transistors. This means that there is an electrical connection between the hot side of the power supply and the individual switching points (if activated). This connection is short-circuit-proofed and capable of carrying a maximum of 30mA. In addition, the switching position is indicated by two yellow LEDs on the rear side of the housing.