We suggest a flow rate of 5 to 15 litres per minute for most sensors (5 l/min max for PyroCube). Only a small amount of air is necessary – just enough to provide some positive pressure in front of the lens, keep it dry and prevent dust getting in. The air should be clean and dry (“instrument” air is recommended). This air purge collar has the same barb-type air fitting as above, with a diameter of 5 mm and an M5 thread. The air purge is attached to the face of the PyroNFC sensor using two longer mounting screws, which are supplied. If you prefer to use your own air fitting, the thread is M5. There is a barb-type fitting with diameter 5 mm. The air purge screws onto the sensing head mounting thread after the FibreMini or ExTemp sensor has been fixed into position using the mounting nuts. There is a female push-fit connection for a 4 mm air line. The air purge is screwed into a dedicated mounting thread over the lens of the PyroCube sensor. You can unscrew it and replace it with an alternative air fitting if you prefer. The air fitting has 1/8″ BSPT thread at both ends. If you are mounting the sensor through your own metalwork instead of the Calex mounting bracket, we recommend the thickness is 2 mm or less for use with the air purge. The air purge collar is screwed onto the threaded part of the sensor, after the mounting nut. Fit the air purge collar to the sensor APL, APSN, APSW: Sensors from the following ranges, with 2:1 optics: PyroCouple, PyroEpsilon, PyroBus, PyroCAN, PyroMini, PyroMiniUSB, PyroMiniBusĪll the above sensors, with all optics except 2:1Ģ. You can add the air purge collar at any time. A choice of air purge collar accessories is available to fit every Calex sensor: Air Purge Collar Model It’s OK if you already have the sensor, but not the air purge collar. The simplest way to do this is to purge the lens continuously with clean air, preventing dust and moisture from reaching it. The lens of every infrared temperature sensor must be kept clean and dry to ensure the pyrometer has a clear view of the target.
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