RTDPlasticsOverview

Plastic Industry RTD Sensors - OVERVIEW
by Pyromation

(PL02) General Purpose Plastic Industry RTDs

These RTDs are those most commonly used in the plastic process industry and the  assemblies can be used in many general applications where a 1/8" NPT fitting is preferred by utilizing either a compression fitting or a bayonet adapter. These assemblies are supplied standard using 316 stainless steel sheath material and a 100 Ω platinum element with a temperature coefficient of 0.003 85 ºC-1 (IEC Class B). Elements of other materials, values, and tolerances are available upon request. 

(PL04) Spring- or Armor-Adjustable Immersion RTDs

This RTD spring-adjustable immersion sensor has a bayonet cap on an 8" spring (standard) to allow for immersion depths of 1/2" to 7". This assembly is used in a variety of applications (with a bayonet adapter) where ease of installation and quick disconnect is preferred. Standard and metric size bayonet caps and adapters are available. These assemblies are supplied standard using 316 stainless steel sheath material and a 100 Ω platinum element with a temperature coefficient of 0.003 85 ºC-1 (IEC Class B). Elements of other materials, values, and tolerances are available upon request. 

(PL06) Melt Bolt RTDs

The melt-bolt RTD sensor illustrated below is used on extruders and injection molding machines to directly measure the melt temperature of plastic as it moves down the extruder barrel. This sensor is made of 300 series stainless steel and is constructed using a 100 Ω platinum element with a temperature coefficient of 0.003 85 ºC-1 (IEC Class B). Elements of other materials, values, and tolerances are available upon request. 

(PL09) Threaded Nozzle RTDs

The threaded nozzle RTD illustrated below is generally used to measure the temperature of the nozzle of an injection molding machine. This style is not in direct contact with the molten plastic. Due to the relatively small size of this sensor, other general areas of use include mounting in bearing housings, sealing bars, heat plates, and other limited space applications. These assemblies are supplied standard using a 100 ohm platinum element with a temperature coefficient of 0.003 85 ºC-1 (IEC Class B). Elements of other materials, values, and tolerances are available upon request. 

(PL11) Ring RTDs

The ring type assembly pictured below has the RTD element embedded into a brass ring. Various ring sizes are available to measure the surface temperature of nozzles, extruder barrels, die heads, molds, and many other applicable surfaces. This assembly is supplied standard using a 100 Ω platinum element with a temperature coefficient of 0.003 85 °C-1 (IEC Class B). Elements of other materials, values, and tolerances are available upon request. 

(PL15) Flexible RTD Extensions

The flexible RTD extensions illustrated below are constructed using stranded copper wire with various insulations. They are used as extension cords to provide suitable connections between sensors, jack panels, or instrumentation.