帶顯示器壓力變送器Local Display Pressure Transmitter 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 proof pressure
LED 31/2 digit display with 4~20mA
2-wire current output signal
Explosion protected terminal head Ex d
IIC T6
Applications
The P700 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 P700 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 an 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.
They are 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 resistances 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 P728 / P729 P748 / P749
Technology Piezoresistive silicon pressure sensor Capacitive ceramic pressure sensor
Pressure ranges 0~0.1 to 350kgf/cm2 relative 0~250mmH20 to 70kgf/cm2 relative
0~1 to 350kgf/cm2 absolute 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(option)
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 ±0.99% 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 Not critical but 0.1 to 0.5bar should be mounted vertically
Weight Approx. (950g)
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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