Sensors & Transducers


Miniature infrared temperature sensors

December 2004 Sensors & Transducers

Featuring what is believed to be the industry's smallest non-contact infrared temperature sensing head, the Raytek MID (miniature digital) sensor is suitable for any installation requirement in production and equipment monitoring applications where large sensors are impractical or where multiple sensors are required to ensure uniform temperature measurement along a production line. The MID consists of a miniature, stainless steel sensing head and separate compact electronics with a five digit backlit LCD interface for simple set-up. Advanced digital communication options provide performance available otherwise only in larger, more expensive temperature monitoring devices.

Available with either 10:1 or 2:1 optics, the Raytek MID provides 1% accuracy across a broad temperature range from -40 to 1200°C with a fast response time of 150 ms. The small infrared sensing head is housed in a rugged stainless steel enclosure to ensure long-term performance, even in harsh production environments. Signal processing features, including emissivity, peal hold, valley hold, and averaging, are easily adjustable on the LCD user interface. A 5 V alarm signal is triggered when the pre-set target temperature or sensor head ambient temperature is exceeded. Window bases DataTemp MulitDrop software allows technicians to program remote sensors, collect, organise and display temperature information on a OC, as well as to print temperature and time in practical graphs and tables.

Raytek also has an answer for a single compact thermocouple replacement unit with a temperature response time of 350 ms. These compact units can also cater for high ambient temperature environments and can work in dusty areas with the lens air purging. Similar in size to an 18 mm proximity switch, it will run off of 12 to 24 V d.c. and it will produce fast, accurate response with type 'J' or 'K' thermocouple output that may be used with an existing indication or control system. The unit has a 4:1 optical ratio and a temperature range up to 500°C, making it suitable for most machine applications.



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