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.
Applications
- 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)
- 125 mV typical FSO on current version
- 75 ±1 mV FSO on voltage version
- Thermal errors less than 2% FSO
- Two standard ranges:
- 0 to 2.5 psig (0 to 1 bar)
- 0 to 5 psig (0 to 345 mBar)
- Standard configurations include: 0.74 in (19 mm) diameter x 0.28 in (7.1 mm) long cylinder
- Custom configurations and other pressure ranges available.
Specifications
| Constant Current (1.5 mA) | Constant Voltage (10 V) | |||
| General | Value | Notes | Value | Notes |
| Pressure Range: 2.5 PSI | 0 to 2.5 psi (0 to 172 mbar) | 17.2 kPa | 0 to 2.5 psi (0 to 172 mbar) | 17.2 kPa |
| Pressure Range: 5 PSI | 0 to 5 psi (0 to 345 mbar) | 34.5 kPa | 0 to 5 psi (0 to 345 mbar) | 34.5 kPa |
| Maximum Overpressure | 3x pressure | rated | 3x pressure | rated |
| Electrical @ 77°F (25°C) unless otherwise stated | ||||
| Input Exictation | 1.5 mA maximum | 2 mA maximum | 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 | ||||
| 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 | ||||
| Weight | 0.02 lb (10 g) | NPT-19A-XXX | 0.02 lb (10 g) | NPT-19A-XXX |
| Media Compatibility | All corrosive media compatible with 316 L stainless steel | |||
| Case and Diaphragm Material | 316 L stainless steel | |||
| Recommended O-Ring | NPI-19A; 0.66 in x 0.039 in (16.76 mm x 1 mm) | |||
| Compensated Performance | Constant Current (1.5 mA) | Constant Voltage (10 V) | |||||||
| Parameter Notes | Units | Minimum | Type | Maximum | Units | Minimum | Type | Maximum | Note |
| Offset | mV | -2 | ±1 | 2 | mV | -2 | ±1 | 2 | |
| Full Scale Output | |||||||||
| 2.5 PSI | mV | 50 | 125 | 200 | mV | 72 | 75 | 78 | |
| 5 PSI | mV | 50 | 125 | 200 | mV | 74 | 75 | 76 | |
| Static Accuracy | %FSO | -0.5 | 0.1 | 0.5 | %FSO | -0.5 | 0.1 | 0.5 | 2 |
| Thermal Accuracy of Offset | |||||||||
| 2.5 PSI | %FSO | -2 | ±0.5 | 2 | %FSO | -2 | ±0.5 | 2 | 3 |
| 5 PSI | %FSO | -1.5 | ±0.5 | 1.5 | %FSO | -1.5 | ±0.5 | 1.5 | 3 |
| Thermal Accuracy of FSO | |||||||||
| 2.5 PSI | %FSO | -2 | ±0.5 | 2 | %FSO | -2 | ±0.5 | 2 | 3 |
| 5 PSI | %FSO | -1.0 | ±0.5 | 1.0 | %FSO | -1.0 | ±0.5 | 1.0 | 3 |
| Thermal Repeatability | |||||||||
| 2.5 PSI | %FSO | -0.3 | 0.1 | 0.3 | %FSO | -0.2 | 0.1 | 0.2 | 3 |
| 5 PSI | %FSO | -0.2 | 0.1 | 0.2 | %FSO | -0.2 | 0.1 | 0.2 | 3 |
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Part Nos.
| 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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