NovaSensor NPI-19 Series

NovaSensor NPI-19 Series

Low Pressure Sensors

NovaSensor NPI-19 Series of Low Pressure Sensors consists of media-isolated pressure sensors that are designed to operate in hostile environments while still providing the outstanding sensitivity, linearity and hysteresis of a silicon sensor.The piezoresistive sensor chip is housed in a fluid-filled cylindrical cavity and isolated from measured media by a stainless steel diaphragm and body. As with all NovaSensor silicon sensors, the NPI Series employs SenStable® processing technology, providing excellent output stability. It is available in either a constant current or constant voltage version.The modular design allows for a variety of pressure port modules, which are hermetically welded to the sensor header module. There are other standard port styles available as well.

Application
  • Process control systems
  • Hydraulic systems and valves
  • Biomedical instruments
  • Refrigeration and HVAC controls
  • Appliances and consumer electronics
  • Ship and marine systems
  • Aircraft and avionic systems

Features
  • Solid state, high reliability
  • 316L stainless steel, ISO sensor design
  • ±0.5% static accuracy
  • Temperature compensated 32°F to 158°F (0°C to 70°C)
  • High sensitivity, 100 mV FSO with 1.0 mA excitation
  • Linearity 0.1% FSO typical
  • Four standard ranges: 0 to 15 psig (0 to 1 bar), 0 to 250 psig (0 to 17 bar) available in gauge or absolute
  • Voltage driven ranges: 15, 30, 50, 100, 200 and 300 psi (1, 2, 3, 7, 14 and 20 bar) gauge and absolute
  • Standard configurations include:
    • 1/2 in-20 UNF threaded male port with 1.0 in (25 mm) flange
    • 0.74 in (18.8 mm) diameter x 0.28 in (7 mm) long cylinder with o-ring seals
    • 1/4 in-18 NPT male port with 7/8 in (22 mm) flange
    • 1/8 in-27 NPT male port with 7/8 in (22 mm) flange
  • Custom configurations and other pressure ranges available.

Specifications

Pressure Ranges Value
Gauge and Differential 5, 15, 30, 50 and 100 psi (0.34, 1, 2, 3.4 and 7 bar)
Absolute 15, 30, 50 and 100 psi (1.03, 2.06, 6.89 bar)

Electrical Specifications @ 77°F (25°C) Constant Current (1.5 mA) Notes Constant Voltage (10V) Notes
Input Excitation 1.5 mA max 2 mA max 10 VDC 12 VDC
Insulation Resistance 108 Ω @ 50 VDC 108 Ω @ 50 VDC
Input Impedance 4000 Ω typical 10,000 Ω typical
Output Impedance 5000 Ω ±20% 5000 Ω ±20%
Bridge Impedance 5000 Ω ±20% 5000 Ω ±20%

Environmental Specifications Constant Current (1.5 mA) Notes Constant Voltage (10V) Notes
Compensated Temperature 32°F to 158°F (0°C to 70°C) 32°F to 158°F (0°C to 70°C)
Operating Temperature 14°F to 176°F (-10°C to 80°C) 14°F to 176°F (-10°C to 80°C)
Storage Temperature -40°F to 257°F (-40°C to 125°C) -40°F to 257°F (-40°C to 125°C)

Mechanical Value Notes
Weight 0.02 lb (10 g)
0.1 lb (45 g)		 NPI-19A-XXX
NPI-19B/H/J-XXX
Media Compatibility All corrosive media compatible with 316 L stainless steel
Case and Diaphragm Material 316 L stainless steel
Recommended O-Ring – Type A 0.66 in x 0.039 (16.76 mm x 1 mm) diameter
Recommended O-Ring – Type B 2-013 per ISO 3601/1

Performance Parameters(5) Compensated(1) Units Min. Typical Max. Notes
Offset mV -2 1 2 mV
FSO Output
NPI-19 mV 70 100 130 2
NPI-19VC mV 99 100 101 2
Linearity %FSO -0.25 0.1 0.25 3
Hysteresis and Repeatability %FSO -0.05 0.01 0.05
Thermal Accuracy of Offset
NPI-19 %FSO -0.75 0.2 0.75 4
NPI-19VC %FSO -1.0 0.2 1.0 4
Thermal Accuracy %FSO -0.75 0.2 0.75 4
Thermal Hysteresis %FSO -0.2 0.1 0.2 5
Short-Term Stability of Offset µV/V 6
Short-Term Stability of FSO µV/V 5 6
Long-Term Stability of Offset %FSO 0.1 7
Long-Term Stability of FSO %FSO 0.1 7
  1. Performance with offset, thermal accuracy of offset, and thermal accuracy of FSO compensation resistors.
  2. FSO with 1.0 mA input excitation, 10 VDC for NPI-19VC.
  3. Linearity by best fit straight line.
  4. 2°F to 158°F (0°C to 70°C) with reference to 77°F (25°C).
  5. 32°F to 158°F (0 to 70°C), by design.
  6. Normalized offset/bridge voltage—100 hours, typical value, not tested in production.
  7. 1 year, typical value, not tested in production.
  8. Consult factory for vacuum applications.

Product Documents

Part Numbers
Part Number Description
NPI-19-A-021-G-H No port, 2.5psi, 1.5mA, constant current supply (1.5mA)
NPI-19-A-021-G-V No port, 2.5psi, 1.5mA, constant voltage supply (10VDC)
NPI-19-A-002-G-H No port, 2.5psi, 10 V, constant current supply (1.5mA)
NPI-19-A-002-G-V No port, 2.5psi, 10 V, constant voltage supply (10VDC)
NPI-19-A-031-G-H No port, 5psi, 1.5mA, constant current supply (1.5mA)
NPI-19-A-031-G-V No port, 5psi, 1.5mA, constant voltage supply (10VDC)
NPI-19-A-005-G-H No port, 5psi, 10 V, constant current supply (1.5mA)
NPI-19-A-005-G-V No port, 5psi, 10 V, constant voltage supply (10VDC)
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