NovaSensor NPI-15 Series

The NovaSensor NPI-15 Series of current-driven, media-isolated High Pressure Sensors are designed to operate in hostile environments, and yet give the outstanding sensitivity, linearity, and hysteresis of a silicon sensor. They incorporate state-of-the-art IsoSensor technology, which gives the OEM user the best in price and performance. The piezoresistive sensor chip is housed in a fluid-filled cylindrical cavity and isolated from the measured media by a stainless steel diaphragm and body. As with all NovaSensor silicon sensors, the NPI-15 Series employs SenStable® processing technology, providing excellent stability.

For compensation of temperature effects, a complete resistor network is supplied on a hybrid ceramic substrate. The IsoSensor design minimizes temperature errors to provide a maximum offset errors of 0.75% FSO over the 32°F to 158°F (0°C to 70°C) compensated range.

General	Value	Units	Notes
Pressure Range	3500	kPa	507 psi
	7000	kPa	1015 psi
	35,000	kPa	5076 psi
Maximum Pressure	2x		rated pressure
Electrical @ 77°F (25°C) unless otherwise stated	Value	Units	Notes
Input Excitation	1.0	mA	1.5 mA maximum
Insulation Resistance	100M	Ω	@ 50 VDC
Input Impedance (min)	4,000	Ω	± 20%
Output Impedance	5,000	Ω	± 20%
Bridge Impedance	5,000	Ω	± 20%
Environmental	Value	Units	Notes
Operating₍₉₎ Temperature Range	–40°F to 257°F (–40°C to 125°C)
Compensated Temperature Range	32°F to 158°F (0°C to 70°C)
Vibration	10	gRMS	20 to 2000Hz
Shock	100	g	11 milliseconds
Life (Dynamic Pressure Cycle)	10 x 106	cycles	500/1000 psi 34.47/68.94 (bar)
Life (Dynamic Pressure Cycle)	1 x 106	cycles	5000 psi 344.73 (bar)
Mechanical₍₁₎	Value	Units	Notes
Weight	»28	g	(28 g) NPI–15A–XXX
Weight	»47	g	(47 g) NPI–15B–XXX
Media Compatibility	All corrosive media compatible with 316 stainless steel
Case and Diaphragm Material	316L stainless steel
Recommended O-Ring	Type A: 0.472 in (12 mm) ID x 0.059 in (1.5 mm) wall
Recommended O-Ring	Type B: 2-013 per ISO 3601/1

Parameters	Units	Min	Typical	Max	Notes
Performance Parameters	kPa	3500	7000	35000	1, 8
Offset	mV	-2	1	2
Full Scale Output	mV	170	200	230	2
Linearity	%FSO	–0.25	0.1	0.25	3
Hysteresis and Repeatability	%FSO	–.05	0.01	0.05
Thermal Accuracy of Offset	%FSO	–0.75	0.2	0.75	4
Thermal Accuracy of FSO	%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		5		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

Notes

Performance with offset, thermal accuracy of offset and thermal accuracy of FSO compensation resistors.
FSO with 1.0 mA input excitation.
Linearity by best fit straight line.
32°F to 158°F (0°C to 70°C) with reference to 77°F (25°C).
32°F to 158°F (0°C to 70°C,) by design.
Normalized offset/ bridge voltage—100 hours, typical value, not tested in production.
One year, typical value, not tested in production.
All values measured at 77°F (25°C) and at 1.0 mA constant current, unless otherwise noted.
Reduced performance outside compensation range, not tested in production.

Part Number	Description
NPI-15A-352-A-H	No Port, 3500kPa, absolute pressure, constant current excitation
NPI-15A-352-S-H	No Port, 3500kPa, sealed gauge, constant current excitation
NPI-15A-702-A-H	No Port, 7000kPa, absolute pressure, constant current excitation
NPI-15A-702-S-H	No Port, 7000kPa, sealed gauge, constant current excitation
NPI-15A-353-A-H	No Port, 35000kPa, absolute pressure, constant current excitation
NPI-15A-353-S-H	No Port, 35000kPa, sealed gauge, constant current excitation
NPI-15B-352-A-H	1/2-20 UNF, 3500kPa, absolute pressure, constant current excitation
NPI-15B-352-S-H	1/2-20 UNF, 3500kPa, sealed gauge, constant current excitation
NPI-15B-702-A-H	1/2-20 UNF, 7000kPa, absolute pressure, constant current excitation
NPI-15B-702-S-H	1/2-20 UNF, 7000kPa, sealed gauge, constant current excitation
NPI-15H-352-A-H	1/4-18 NPT, 3500kPa, absolute pressure, constant current excitation
NPI-15H-352-S-H	1/4-18 NPT, 3500kPa, sealed gauge, constant current excitation
NPI-15H-702-A-H	1/4-18 NPT, 7000kPa, absolute pressure, constant current excitation
NPI-15H-702-S-H	1/4-18 NPT, 7000kPa, sealed gauge, constant current excitation
NPI-15J-352-A-H	1/8-27 NPT, 3500kPa, absolute pressure, constant current excitation
NPI-15J-352-S-H	1/8-27 NPT, 3500kPa, sealed gauge, constant current excitation
NPI-15J-702-A-H	1/8-27 NPT, 7000kPa, absolute pressure, constant current excitation
NPI-15J-702-S-H	1/8-27 NPT, 7000kPa, sealed gauge, constant current excitation

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