Ultra Low Pressure Sensors
Description
OCTOBER 1997
SURSENSE™ Ultra Low Pressure Sensors
DCAL4 Series
Ratiometric 4-Volt Output High Accuracy Compensation Full Scale Pressure Ranges 0 to 1 in.
H2O to 0 to 30 in.
H2O ± 0 to ± 1 in.
H2O to ± 0 to ± 30 in.
H2O DESCRIPTION
The SURSENSE™ line of ultra low pressure sensors is based upon a proprietary, patent applied for technology designed to reduce all output offset or common mode errors.
These sensors utilize a silicon, micromachined sensing element which features a unique stress concentration enhanced structure to provide a highly stable linear output that is proportional to applied pressure.
Output offset errors due to changes in temperature, warm-up, long term stability and position sensitivity have all been significantly reduced when compared to conventional sensors.
The DCAL series sensors provide a precision calibrated ratiometric 4 -volt output with SURSENSE enhanced stability.
Each sensor features the precision calibration found in the DCX series with the addition of fully integrated signal conditioning in an industry standard package.
Intended to operate from a fixed 5Vdc supply, the DCAL4 gage pressure sensors provide a 0.
25v to 4.
25v output while the differential versions provide a ± 2.
0 volt output centered on a 2.
25 volt zero pressure offset.
These highly stable sensors are ideally suited for microprocessor or microcontroller based systems.
APPLICATIONS
s Medical Instrumentation s HVAC s Environmental Controls s Portable Monitors
FEATURES
s Available in Gage and Differential Pressure Ranges s Temperature Compensated over 0°C to 50°C s Position Sensitivity to ± 5mV/g s Warm-up drift < ± 5mV s Long Term Stability < ± 10mV s Combined Linearity and Hysteresis Error < ± 0.
25%FS s Custom Calibration Available
EQUIVALENT CIRCUIT
VEXCITATION (1)
PINOUT 1 VEXCITATION Common VOUTPUT VOFFSET
–
2
VOUTPUT (3)
+
3 4
VOFFSET (4) Common (2)
DCAL Series
SURSENSE™ Ultra Low Pressure Sensors
DCAL401GN
Ratiometric 4-Volt Output High Accuracy Compensati...
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