· 2 year warranty and 60 years of Dynisco industry experience
· Accuracy better than ±0.5%
· TiAlN diaphragm coating is standard
· mV/V, 0-10VDC, or mA outputs available
· Integral temperature sensor option
· Available in configurations that fit most extruder applications
· 1.5M, 3M, 5M, 7.5M & 10M psi pressure range capability
· Alternative fill model available
Operating Principle
The Dynisco EchoTM Melt Pressure Sensors are used to makepressure measurements of molten polymers up to 752°F (400°C). These modelsincorporate a 350?Ohm, bonded foil strain gage Wheatstone Bridge. This proventechnology provides an output of 0?3.33 mV/V, & 4?20mA, 05?VDC and 0?10VDCproportional to melt pressure (within the specified error band). Most modelsinclude an internal shunt calibration (\"Rcal\") function that is usedto simulate a signal of 80% of full scale. This eliminates the need for acumbersome calibrated pressure source when scaling associated instrumentation.
Installation
Do not remove protective cap until ready to install. Priorto initial installation, verify correct machining of mounting hole per Figure1. Gauge Plug, P/N 200908, is available for this purpose. Before installingmake sure that mounting hole is clear of material. Dynisco Cleaning Tool Kit,P/N 200100, should be used. To prevent galling, lightly coat transducer threadswith a high temperature anti?seize material. An adequate seal, in a properlymachined and maintained mounting well, is obtained with 100 in?lbs. mountingtorque. The maximum torque recommended is 500 in?lbs. The electronics housingshould be secured, with the optional mounting bracket (P/N 200941), in an areawhere the ambient temperature will not exceed 185°F (85°C). (Mounting bracketnot supplied with EchoTM models.)
Wiring
Use shielded cable. Attach cable shield to ground at one endonly. NOTE: DYNISCO cable assemblies are constructed with shield wired totransducer mating connector, so do not attach shield to instrument. OutputSupply Voltage mV/V 10 Vdc (12 Vdc max) mA 14?36 Vdc Vdc 16?36 Vdc
Start?Up
Bring system to operating temperature with no pressure. FormA units, remove adjustment access screw and adjust Zero Output potentiometer.For mV/V units, zero adjustment must be handled by downstream indicator. Makesure that there is sufficient \"soak time\" to assure that any materialat the tip of the transducer is molten before extruder drive is started.
Removal
Transducer should only be removed when polymer is hot andliquid. Wipe tip with a soft cloth immediately. The melt pressure transducermust be removed before using an abrasive material or wire brush to clean theextruder barrel. Clean the mounting well before attempting to reinstall thetransducer with Dynisco Mounting Well Cleaning Tool Kit, P/N 200100.
Thermocouple
Thermocouples ( Type J or K) in a rigid stem are optionallyavailable. The Type J (iron?constantan) and Type K is a T/C junction justbehind the flush diaphragm at the tip of the transducer. For the most accuratetemperature measurement of the melt stream, use a separate immersion?typethermocouple, such as Dynisco TB422 fixed depth series or (G)RMT adjustablemodels. The thermocouple assembly can be removed by loosening the set screw onthe side of hex assembly and pulling the T/C probe, carefully, straight out,without twisting. Replacement assemblies are available. When installing thethermocouple probe assembly, align the slot with the pressure capillary tubeand press into snout until top of probe shoulders flush against snout. Lock inplace with set screw.
Warranty
This Dynisco product is warranted under terms and conditionsset forth in the Dynisco Web Pages. Go to www.dynisco.com and click on“Warranty” at the bottom of any page for complete details.
Datasheet(s) [PDF]
- dynisco-echoe22611122-sensor-235691.pdf
