Compact Pressure Transmitter With Local Display
紧凑型压力变送器本地显示器
Advantages General Description High precision pressure transmitter with local display for industrial applications Measuring ranges from 250mmH2O to 350kgf/cm2 Advanced piezoresistive silicon or capacitive ceramic measuring cell Excellent accuracy and long term stability Extremely high proofed pressure LED 31/2 digit display with 4~20mA 2-wire current output signal Explosion protected terminal head rated Ex d IIC T6 Applications The P7XS series pressure transmitter is ideal for measurements which require a local display and a need to communicate with remote data acquisition equipment in industrial applications. The 2-wire 4 to 20mA signal can be transmitted over great distance with negligible loss of accuracy. Standard hydraulic and pneumatic equipments Regulation system of transmission line of LPG and LNG Machine tools and automatic machinery Flow control and water treatment Oil and off-shore industry Equipments for chemical and petrochemical industry Automation system and plant engineering Liquid level measurement
P7XS series pressure transmitter with local display is a signal conditioned, media-isolated pressure transmitter that can be used for a wide variety of applications. The transmitter offers the convenience and easy installation of a LED display with the full capabilities of a highly accurate 4~20mA 2-wire system design. The 2-wire 4 to 20mA output signal can be transmitted over great distances with negligible loss of accuracy. The stainless steel surfaces make it compatible with a wide variety of gases and liquids and can be protected from harsh environment. It is extremely versatile and suitable for measuring dynamic or static pressure. The transmitters are available as absolute and relative pressure types with either 2-wire current or 3-wire voltage output. The pressure to be measured acts through thin corrosion resistant stainless steel 316L diaphragm on a silicon measuring element. The pressure transmitting medium is silicon oil. The measuring element contains diffused piezoresistive resistors which are connected into a Wheatstone bridge. The output signal of this bridge is temperature compensated and converted into a standardized current or voltage output signal.
Model P72S P74S Technology Piezoresistive silicon pressure sensor Capacitive ceramic pressure sensor Pressure ranges 0~0.1 to 350kgf/cm2 relative pressure 0~250mmH20 to 70kgf/cm2 relative 0~1 to 350kgf/cm2 absolute pressure 0~1 to 70kgf/cm2 absolute Pressure reference Gauge, absolute, vacuum and compound Overload 3×full scale without damage 6×full scale without damage Current output signal 4~20mA DC 2-wire technique Voltage output signal 1~5V DC 3-wire technique Other output signal available on request Local display LED 31/2 digit Excitation voltage 12~36V DC Load resistance max@24V 500Ω at 24V Influence of excitation 0.01% FSO/V Power ripple ≤500mV P-P Reverse polarity Protected Shock resistance No change in performance after 10Gs for 11ms Vibration 0.1G (1 m/s/s) maximum Response time(10~90%) ≤2 milliseconds 1 milliseconds Adjustment ±10% FSO/zero and span ±20% FSO/zero and span Accuracy ≤±0.25% FSO ≤±0.2% FSO Non-linearity ±0.100% FSO typical ±0.15% FSO Repeatability ±0.015% FSO typical ±0.10% FSO Pressure hysteresis ±0.010% FSO typical ±0.10% FSO Long term stability ±0.3% FSO over 6 month Max. annual error ±0.10% FSO Cutoff frequency(-3 d B) ≤2kHz Reference temperature 35°C 25°C Operating temperature range -40~125°C -40~125°C Compensated temperature range 0~82°C -20~80°C Thermal sensitivity shift ≤±0.2%FSO in reference to 35°C typical ≤±0.05%FSO Thermal zero shift ≤±0.2% FSO in reference to 35°C typical ≤±0.1%FSO Thermal hysteresis ≤±0.1% FSO in reference to 35°C typical ≤±0.1%FSO Process connection PT1/4″, PT3/8″, PT1/2″male thread PF1/4″, PF3/8″, PF1/2″male thread Other connections available on request Process media Compatible with stainless steel 316 Ceramic Al2 O3, 96% Materials wetted by process Diaphragm : Stainless steel 316L Ceramic Al2 O3, 96% Housing : Aluminum Die-casting Gasket O-ring : Viton (HNBR, CSM, etc.) Enclosure rating IP65 Explosion protection Ex d IIC T6 Influence of mounting position Under 0.5kgf/cm2, mounted vertically Not critical Weight Approx.(802g) Options Sealed diaphragm with thread connection Sealed diaphragm with flange mounting Siphon tube Sealed diaphragm with capillary Note : ① For high pressure measurement, this model is available up to 2000kgf/cm2 with thin film pressure sensor. ② If it is installed in explosive atomosphere, the covers should be kept tight when circuit alive.
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