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L829 L849微型處理器,數(shù)字水準(zhǔn)儀壓力開(kāi)關(guān)

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Micro-processorBasedDigitalLevelPressureSwitch微型處理器

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Micro-processor Based Digital Level Pressure Switch
微型處理器,數(shù)字水準(zhǔn)儀壓力開(kāi)關(guān)
Advantages General Description
􄤎High precision micro-processor based
digital level pressure switch/transmitter
for industrial applications
􄤎Adjustable switch points allow the user
to obtain various pressure settings for
each of the 2 switches and span
􄤎Measuring ranges from 250mmH2O to
35kgf/cm2
􄤎Advanced piezoresistive silicon
measuring cell or capacitive ceramic
sensor
􄤎Excellent accuracy and long term
stability
􄤎4 digit LED local display
􄤎2 switching points with analog output
and 4-digit LED display
􄤎Measuring range turn down maximum
10 : 1
Applications
The high precision micro-processor based
digital level pressure switch with analog
output signal can be used for a wide range
of applications in….
􄤎Bioengineering and process engineering
􄤎Chemical, petrochemical, food and
drug process controls
􄤎LPG and LNG transmission control and
storage tank monitoring
L800 series micro-processor based digital level pressure
switch with analog output is ideal for applications that
require for continuous level measurement of liquids and
pastes in the chemical, pharmaceutical and foodstuffs
industries as well as in water and wastewater treatment.
The L848, with its built-in capacitive ceramic pressure
measuring chip, a 4-digit digital display, 2 switching
points, 4~20mA analog output signal and a front function
keys, offers the user all the advantages of a modern
electronic pressure measurement. External adjustments
allow the user to set the measuring ranges, switch points,
deadband and zero or span calibration, etc. It has a
water resistant, stainless steel housing for complete
protection from harsh environment and its 4~20mA
current output or 2 switching points 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 almost every liquid in
industrial applications.
Technical Data
Model L829 L849
Measuring priciples Piezoresistive silicon pressure sensor Capacitive ceramic pressure sensor
Pressure ranges 0~0.1 to 35kgf/cm2 relative pressure 0~250mmH2O to 35kgf/cm2
Pressure reference Gauge pressure
Overload 3×full scale without damage 5×full scale without damage
Output Signal 2 switching points
2 switching points with analog output (4~20mA)
4~20mA 2-wire current output
Other signals available on
Local display LED 4 digit
Electrical connection type Terminal head with explosion protection(Ex d IIC T6)
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
Switching current Maximum 1.2A
Range turn down Max 10 :1
Accuracy ≤±0.25% FSO ≤±0.2% FSO
Non-linearity ±0.99% FSO typical
Repeatability ±0.015% FSO typical
Pressure hysteresis ±0.010% FSO typical
Long term stability ±0.3% FSO over 6 month Maximum annual error 0.1%
Cutoff frequency(-3 d B) ≤2kHz
Reference temperature 35°C
Operating temperature range -40~125°C -40~125°C
Compensated temperature range 0~82°C -20~80°C
Thermal sensitivity shift ≤±0.5%FSO in reference to 35°C typical Max. ±0.3%
Thermal zero shift ≤±0.5% FSO in reference to 35°C typical Max. ±0.75%
Thermal hysteresis ≤±0.1% FSO in reference to 35°C typical
Process connection Flange per JIS, ANSI, DIN
Clamp
Other connections available on request
Electrical connection PT1/2"female
Process media Gases and liquids, also aggressive and corrosive, as far as compatible with
stainless steel 316 & aluminum oxide ceramics (96%)
Materials wetted by process Diaphragm : Stainless steel 316L Ceramic Al2 O3, 96%
Housing : Aluminum die-casting terminal head
No O-Ring Gasket O-ring : Viton, Teflon
Enclosure rating IP67
Explosion protection Ex d IIC T6
Influence of mounting position Under 0.5kgf/cm2, mounted vertically Not critical
Weight Approx. 1500g
Options Remote sealed diaphragm
Note


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