NPH-8 Datasheet, PDF (2/4 Pages) Amphenol Corporation – Solid state, high reliability

NPH Series Specifications
Description
An integrated circuit silicon sensor chip is housed
in a standard TO-8 electrical package that is printed
circuit board mountable.
The latest techniques in micromachining have been
used to ion-implant piezoresistive strain gauges into
a wheatstone bridge configuration that is integrally
formed on a micromachined silicon diaphragm.
As with all NovaSensor silicon sensors, the NPH
Series employs SenStable^® processing technology,
providing excellent output stability. Constant
current excitation to the sensor produces a voltage
output that is linearly proportional to the input
pressure.
The user can provide standard signal conditioning
circuitry to amplify the 100 mV output signal. The
sensor is compatible with most non-corrosive gases
and dry air.
A laser-trimmed, thick-film resistor network on a
hybrid ceramic substrate provides temperature
compensation.
Parameter
Value
Units Notes
General
Pressure Range
0 to 10
inH2O (0 to 25 mbar) 0 to 2.5
kPa
0 to 1
psi
(0 to 7 bar) 0 to 7 kPa
0 to 5
psi
(0 to 0.34 bar) 0 to 30
kPa
Maximum Pressure
5x
rated pressure ⁽¹⁰⁾
Electrical @ 77°F (25°C) Unless Otherwise Stated
Input Excitation
1.5
mA
2 mA maximum
Insulation Resistance
100
MΩ
@ 50 VDC
Input Impedance
3200
Ω
±25%
Output Impedance
5000
Ω
±20%
Bridge Impedance
5000
Ω
±20%
Environmental
Temperature Range
Operating⁽⁹)
–40 to 257 °F
(-40°C to 125°C)
Compensated
32 to 158 °F
(0°C to 70°C)
Vibration
10
gRMS 20 to 2000Hz
Shock
100
g
11 milliseconds
Life (Dynamic Pressure
Cycle)
1 x 10⁶
cycles
Mechanical ⁽¹⁾
Weight
<0.2
oz
(<5 g)
Media Compatibility
Non-corrosive gases and clean, dry air
Wetted Materials
Top Port
Bottom Port
Nickel, gold plated Kovar, silicone gel, gold
wire, RTV, silicon and glass.
Gold plated Kovar, silicon, glass and RTV ⁽⁹⁾
NPH Series schematic diagram
Parameter
Min. Typical Max. Min. Typical
2.5
7 & 30
kPa
kPa
Performance Parameters(7), Compensated(1)
Offset
-8
2
8
-4
2
Full Scale (FS) Output
2.5 kPa
25 50
90
7 kPa
50 75
30 kPa
75 100
Linearity
–1.0 0.1
1.0 –0.25 0.05
Hysteresis &
Repeatability
-0.2 0.05 0.2 -0.2 0.05
Thermal
Accuracy of
Offset
-3
0.5
3
-2
0.5
Accuracy of FSO –3
–1
3
-1.5 -0.5
Thermal
Hysteresis
–0.75 0.5
0.75 –0.5 0.2
Short-Term
5
5
Stability of Offset
Short-Term
5
5
Stability of FSO
Max. Units Notes
4
mV
mV
2
150 mV
2
125 mV
2
0.25 %FSO 3
0.2 %FSO
2
%FSO 4
1.5 %FSO 4
0.5 %FSO 5
µV/V 6, 11
µV/V 6, 11
1. Performance with offset, thermal accuracy of offset, and thermal accuracy of FSO
compensation resistors.
2. FSO with 1.5mA input excitation.
3. Best fit straight line.
4. 32°F to 158°F (0°C to 70°C) with reference to 77°F (25°C)
5. 32°F to 158°F (0°C to 70°C), by design
6. Normalized offset/bridge voltage —100 hrs, typical value, not tested in production.
7. All values measured at 77°F (25°C) and at 1.5 mA, unless otherwise noted.
8. Reduced performance outside compensation range.
9. Backside differential tube is nickel or Kovar.
10. Top side pressure.
11. Typical specifications are for reference only; absolute values may vary.