DatasheetDynisco PT450FA / PT450TA Series
The Dynisco PT450FA / PT450TA Series includes flange-mounted and threaded melt pressure sensors for processing low-viscosity materials. The sensors are designed for pressure ranges from 0…250 psi to 0…10,000 psi and achieve accuracy down to ±0.25 % FSO depending on the pressure range. Their design makes them especially suitable as replacements for traditional “button-seal” units.
The PT450 Series is available in two versions: the PT450FA flanged version with flexible stem and the PT450TA threaded version. Both models are ideal for processing low-viscosity materials and for applications such as fibre spinning and polymer transport lines. The sensors withstand process temperatures up to 700 °F and are designed for reliable melt pressure measurement in demanding industrial applications.
The wetted parts are made of DyMax™ coated 17-4 PH stainless steel. The sensors feature a four active arm bonded Wheatstone bridge strain gauge, a 3.33 mV/V output signal and internal 80 % shunt calibration. Zero balance is specified in the vertical position, and the design takes into account the effect of elevation of the strain gauge housing above the diaphragm.
| Type | Flange-mounted or threaded melt pressure sensor |
|---|---|
| Series | Dynisco PT450FA / PT450TA Series |
| Models | PT450FA and PT450TA |
| Application | Melt pressure measurement with low-viscosity materials, fibre spinning applications and polymer transport lines |
| Versions | PT450FA: flange-mounted version with flexible stem | PT450TA: threaded version |
| Pressure ranges | 0…250 psi, 0…500 psi, 0…750 psi, 0…1,000 psi, 0…1,500 psi, 0…3,000 psi, 0…5,000 psi, 0…7,500 psi, 0…10,000 psi |
| Accuracy | ±0.25 % FSO; ±0.75 % FSO for 250 psi range |
| Repeatability | ±0.1 % FSO |
| Mounting torque PT450FA | 100…125 inch-lbs for adequate seal |
| Mounting torque PT450TA | 100 inch-lbs for adequate seal; 500 inch-lbs maximum with no zero shift or performance change |
| Maximum pressure | 3 × full range |
| Material in contact with pressure media | 17-4 PH stainless steel, DyMax™ coated |
| Effect of elevation of strain gauge housing above diaphragm | 5 psi/ft |
| Weight | 3.5 lbs |
| Maximum diaphragm temperature | 750 °F / 400 °C |
| Zero shift due to diaphragm temperature change | 0.5 % psi / 100 °F from 75 °F to 450 °F; 2 psi / 100 °F from 450 °F to 600 °F change |
| Maximum electronics housing temperature | 250 °F / 121 °C |
| Zero shift due to electronics housing temperature change | 0.5 psi / 100 °F from 75 °F to 450 °F; 2 psi / 100 °F from 450 °F to 600 °F change |
| Sensitivity shift due to temperature change | 0.005 % full scale / °F maximum or 0.01 % full scale / °C |
| Configuration | Four active arm bonded Wheatstone bridge strain gauge |
| Bridge resistance input | 345 Ω minimum |
| Bridge resistance output | 350 Ω ±10 % |
| Full scale output | 3.33 mV/V ±2.0 % |
| Zero balance | ±5 % FSO in vertical position |
| Excitation | 10 VDC recommended, 12 VDC maximum |
| Internal shunt calibration | 80 % FSO ±0.5 % |
| Insulation resistance | 1000 MΩ at 50 VDC |
| Key features | Choice of flanged or threaded configuration, suitable for low-viscosity materials, internal 80 % shunt calibration, replacement for traditional “button-seal” units |
