SenSym SCX01DN, SCX05DN, SCX15AN, SCX15DN, SCX30AN Technical data

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SCX - Series

Precision Compensated Pressure Sensors

FEATURES

· 0 - 1 psi to 0 - 150 psi

· Precision Temperature Compensation

· Calibrated Zero and Span

· Small Size

· Low Noise

· High Accuracy

· High Impedance for Low Power Applications

APPLICATIONS

· Medical Equipment

· Barometry

· Computer Peripherals

· Pneumatic Control

·HVAC

GENERAL DESCRIPTION

The SCX series sensors will provide a very cost effective solution for pressure applications that require high accuracy over a wide temperature range. These internally calibrated and temperature compensated sensors were specifically designed to provide an accurate and stable output over a 0°C to 70°C temperature range. This series is intended for use with non-corrosive, nonionic working fluids such as air, dry gases, and the like.

Devices are available to measure absolute, differential, and gage pressures from 1psi (SCX01) up to 150psi (SCX150). The Absolute (A) devices have an internal vacuum reference and an output voltage proportional to absolute pressure. The Differential (D) devices allow application of pressure to either side of the pressure sensing diaphragm and can be used for gage or differential pressure measurements. The SCX devices feature an integrated circuit sensor element and laser trimmed thick film ceramic housed in a compact nylon case. This package provides excellent corrosion resistance and provides isolation to external package stresses. The package has convenient mounting holes and pressure ports for ease of use with standard plastic tubing for pressure connection.

All SCX devices are calibrated for span to within ±1% and provide a very low zero pressure output of ±300 microvolts maximum. Thus, for many applications,no trimming networks are required in the signal conditioning circuitry. If the application requires extended temperature range ope-

Scale: 1c m

½ inch

ration, beyond 0 to 70°C, two pins which provide an output voltage proportional to temperature are available for use with external circuitry.

The output of the bridge is ratiometric to the supply voltage and operation from any D.C. supply voltage up to +30 V is acceptable.

Because these devices have very low noise and excellent temperature compensation, they are ideal for medical and other high performance applications. The 100 microsecond response time also makes this series an excellent choice for computer peripherals and pneumatic control applications.

EQUIVALENT CIRCUIT

March 1998/053

ELECTRICAL CONNECTION

Pin 1) Temperature Output (+) Pin 2) V Pin 3) Output (+) Pin 4) Ground Pin 5) Output (-) Pin 6) Temperature Output (-)

Note: The polarity indicated is for pressure applied to port B. (For absolute devices

pressure is applied to port A and the output polarity is reversed.)

Aubinger Weg 27, 82178 Puchheim, Germany Phone 0049 - (0) 89 80 08 30, Fax 0049 - (0) 89 8 00 83 33 http://www.sensortechnics.com

SCX - Series

Precision Compensated Pressure Sensors

PRESSURE SENSOR CHARACTERISTICS

ST ANDARD PRESSURE RANGES

PART NUMBER

SCX01DN SCX05DN SCX15AN SCX15DN SCX30AN

SCX30DN SCX100AN SCX100DN SCX150AN

SCX150DN

OPERA TING PRESSURE

0 - 1 psid

0 - 5 psid 0 - 15 psia 0 - 15 psid 0 - 30 psia 0 - 30 psid

0 - 100 psia 0 - 100 psid 0 - 150 psia 0 - 150 psid

PROOF PRESSURE*

* Maximum pressure above which causes permanent sensor failure

20 psid 20 psid 30 psia 30 psid 60 psia

60 psid 150 psia 150 psid 150 psia 150 psid

Min.

17.82 mV

59.4 mV

89.1 mV

99.0 mV

89.1 mV

FULL-SCALE SP AN

Typ.

18 mV 60 mV 90 mV 90 mV 90 mV

90 mV 100 mV 100 mV

90 mV

Max.

18.18 mV

60.6 mV

90.9 mV

101.0 mV

90.9 mV

Maximum Ratings (For All Devices) Environmental Specifications (For All Devices)

Supply Voltage V Common-mode Pressure 50 psig Compensated 0 to 70°C

+30 V

Lead Temperature Operating -40°C to +85°C

(Soldering, 4 seconds) 250°C Storage -55°C to +125°C

COMMON PERFORMANCE CHARACTERISTICS

Characteristic

Zero Pressure Offset Combined Linearity and Hysteresis Temperature Effect on Span (0-70°C) Temperature Effect on Offset (0-70°C) Repeatability Input Impedance Output Impedance Common-mode Voltage Response Time

Long Term Stability of Offset and Span

Temperature Range

Humidity Limits 0 to 100 %RH

Min.

-300

---

5.8

---

Typ.

0 ±0.1 ±0.2

±100

±0.2

4.0

6.0

100

±0.1

Max.

+300

±0.5 ±1.0

±500

±0.5

---

6.2

---

Unit

µV %FSO %FSO

µV %FSO

kΩ

µsec

%FSO

SPECIFICA TION NOTES:

1. Reference conditions: Unless otherwise noted: Supply voltage, VS = 12 V, TA = 25°C, Common-mode Line Pressure = 0 psig,

Pressure Applied to Port B. For absolute devices only, pressure is applied to Port A and the output polarity is reversed.

2. Span is the algebraic difference between the output voltage at full-scale pressure and the output at zero pressure. Span is ratiometric to the supply voltage.

3. See Definition to T erms. Hysteresis - the maximum output difference at any point within the operating pressure range

for increasing and decreasing pressure.

4. Maximum error band of the offset voltage and the error band of the span, relative to the 25°C reading.

5. Maximum difference in output at any pressure with the operating pressure range and temperature within 0°C to +50°C after:

a) 1,000 temperature cycles, 0°C to +70°C b) 1.5 million pressure cycles, 0 psi to full-scale span

6. Input impedance is the impedance between pins 2 and 4.

7. Output impedance is the impedance between pins 3 and 5.

8. This is the common-mode voltage of the output arms (Pins 3 and 5) for V

9. Response time for a 0 psi to full-scale span pressure step change, 10% to 90% rise time.

10. Long term stability over a one year period.

11. Maximum zero pressure offset for absolute devices is 0 ±500 µV.

= 12 VDC.

Aubinger Weg 27, 82178 Puchheim, Germany Phone 0049 - (0) 89 80 08 30, Fax 0049 - (0) 89 8 00 83 33 http://www.sensortechnics.com

March 1998/053

Precision Compensated Pressure Sensors

TYPICAL PERFORMANCE CHARACTERISTICS

SCX - Series

GENERAL DISCUSSION

The SCX series devices give a voltage output which is directly proportional to applied pressure. The devices will give an increasing positiv going output when increasing pressure is applied to pressure port P are reversed, the output will increase with decreases in pressure. The devices are ratiometric to the supply voltage and changes in the supply voltage will cause proportional changes in the offset voltage and full-scale span. Since for absolute devices pressure is applied to port P

User Calibration

The SCX devices are fully calibrated for offset and span and should therefore require little if any user adjustment in most applications. For precise span and offset adjustments, refer to the applications section herein.

Vacuum Reference (Absolute Device)

Absolute sensors have a hermetically sealed vacuum reference chamber. The offset voltage on these units is therefore measured at vacuum, 0 psia. Since all pressure is measured relative to a vacuum reference,all changes in barometric pressure or changes in altitude will cause changes in the device output.

Media Compatibility

SCX devices are compatible with most non-corrosive gases.

March 1998/053

of the device. If the input pressure connections

, output polarity will be reversed.

Because the circuit is coated with a protective silicon gel, many otherwise corrosive environments can be compatible with the sensors. As shown in the physi-cal construction diagram below, fluids must generally be compatible with silicon gel, plastic, aluminium, RTV , silicon, and glass for use with Port B. For questions concerning media compatibility, contact the factory.

MECHANICAL AND MOUNTING CONSIDERATIONS

The SCX nylon housing is designed for convenient pressure connection and easy PC board mounting. To mount the device horizontally to a PC Board, the leads can be bent downward and the package attached to the board using either tie wraps or mounting screws. For pressure attachment, tygon or silicon tubing is recommended. All versions of the SCX sensors have two (2) tubes available for pressure connection. For absolute devices, only port P Applying pressure through the other port will result in pressure dead ending into the backside of the silicon sensor and the device will not give an output signal with pressure. For gage applications, pressure should be applied the port P

is then the vent port which is left open to the atmosphere. For

differential pressure applications, to get proper output signal polarity, port P should be used as the low pressure port.

should be used as the high pressure port and P

Aubinger Weg 27, 82178 Puchheim, Germany Phone 0049 - (0) 89 80 08 30, Fax 0049 - (0) 89 8 00 83 33 http://www.sensortechnics.com

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