Tank Mounted Level Pressure Transmitter壓力變送器 Advantages General Description
Capacitive ceramic measuring sensor
Highly accurate Piezoresistive silicon
measuring sensor
Measuring ranges from 250mmH2O to
35kgf/cm2
Excellent accuracy and long term
stability
Extremely high over-pressure limit
High accuracy level measurement with
temperature stability
Explosion protection Ex d IIC T6 and
weather proofed
Applications
The hydrostatic level pressure transmitters
can be used for a wide range of industrial
applications for tank level measurement.
Continuous level measurement in tanks,
vessels, sumps or pits(liquid)
Water and sewage treatment
Process control for food and beverage
industries
Chemical and petrochemical industries L700 series level pressure transmitters provide reliable
measurement and control of the process level by sensing
the hydrostatic pressure in a tank. The transmitter
incorporates a capacitive or piezoresistive diaphragm
sensor coupled to a proven design, and is 316L stainless
steel on all wetted parts and is repairable. Additional, an
optional LED display allows the user an at-a-glance
reading without the expense of additional gauges or
digital meter. A compact and mass optimized design with
a choice of corrosion resistant materials together with a
wide variety of standard process connection options,
makes it the ideal choice for simple application in many
industries.
The transmitter has a water resistant, stainless steel
housing for complete protection from harsh environments
ａnd its 4~20mA current output is ideal for remote
monitoring of both primary and secondary process
variables. It has been designed as an advanced device
for measuring level pressure of water and liquids in
industrial applications.
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 L749 L729
Technology Capacitive ceramic pressure sensor Piezoresistive silicon pressure sensor
Pressure ranges 0~250mm H2O to 35kgf/cm2 relative pressure 0~0.1 to 35kgf/cm2 relative pressure
0~0.2 to 35kgf/cm2 absolute pressure 0~1 to 35kgf/cm2 absolute
Pressure reference Relative
Overload 6 × full scale without damage 3 × full scale without damage
Electrical connection Terminal head with weather and explosion protection Ex d IIC T6
Output signal 4~20mA DC or 1~5V DC
Other signals 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%) ≤1 milliseconds ≤ milliseconds
Adjustment ±20% FSO/zero and span ±10% FSO/zero and span
Accuracy ≤±0.2% FSO ≤±0.25% FSO
Non-linearity ±0.15% FSO typical ±0.99% FSO typical
Repeatability ±0.10% FSO typical ±0.015% FSO typical
Pressure hysteresis ±0.10% FSO typical ±0.010% FSO typical
Long term stability Max. annual error ±0.3% FSO ±0.3% FSO over 6 month
Cutoff frequency(-3 d B) ≤2kHz
Reference temperature 25°C 35°C
Operating temperature range -40~125°C -40~125°C
Compensated temperature range -20~80°C 0~82°C
Thermal sensitivity shift ≤±0.05%/ FSO typical ≤±0.2%/ FSO typical
Thermal zero shift ≤±0.10% FSO typical ≤±0.2%/ FSO typical
Thermal hysteresis ≤±0.10% FSO typical ≤±0.1%/ FSO typical
Process connection Flange mounting(ANSI, DIN, JIS)
Chemical sealed with Clamp, Flange, etc.
Other process connections available on request
Process media Gases and liquids compatible with
Ceramic Al2 O3, 96% Stainless steel 316
Materials wetted by process Diaphragm : ceramic Al2 O3, 96% Stainless steel 316
Housing : Stainless steel 316 and other materials available on request
Enclosure rating IP65
Explosion protection Ex d IIC T6
Influence of mounting position Not critical Under 0.5kgf/cm2, mounted vertically
Weight Approx. 1500g
Options Remote sealed diaphragm
Note
Input
Output
Electrical Specifications
Performance Specifications
Physical Specifications |
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