NPI-15VC Series High Pressure Sensors

The NovaSensor NPI-15VC Series of voltage-compensated, media-isolated High Pressure Sensors offers the performance of our current-compensated sensors with the convenience of using a voltage supply. Voltage compensation allows the sensor to be connected directly to the power supply, thereby eliminating the need for additional components to construct a constant current source. These sensors enable field interchangeability with a calibrated FSO of 100 mV ±1 %.

As with all NPI media-isolated sensors, they are designed to operate in hostile environments and yet give 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 the measured media by a stainless steel diaphragm and body. The NPI Series employs SenStable® processing technology, providing excellent output stability.

General	Value	Units	Notes
Pressure Range	0-500	psi	3447 kPA
	0-1000	psi	6894 kPA
	0-3000	psi	20,682 kPA
	0-5000	psi	34,470 kPA
Maximum Pressure	2x		rated pressure
Electrical @ 77°F (25°C) unless otherwise stated	Value	Units	Notes
Input Excitation	10	VDC	15 VDC maximum
Insulation Resistance	100M	Ω	@ 50 VDC Input
Input Impedance (min)	4,000	Ω
Output Impedance	5,000	Ω	± 20%
Bridge Impedance	5,000	Ω	± 20%
Environmental	Value	Units	Notes
Operating⁽⁹⁾ Temperature Range	–40 to 257°F (–40°C to 125°C)
Compensated Temperature Range	32 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
Mechanical⁽¹⁾	Value	Units	Notes
Weight	0.06	lb	(28 g) NPI–15A–XXX
Weight	0.10	lb	(47 g) NPI–15B/H/J–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	psi	1000	3000	35000	1, 8
Full Scale Output	mV	99	100	101	2
Linearity	%FSO	–0.35	0.1	0.35	3
Hysteresis and Repeatability	%FSO	–0.05	0.01	0.05	3
Thermal Accuracy of Offset	%FSO	–1.0	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		7

Notes

Performance with offset, thermal accuracy of offset and thermal accuracy of FSO compensation resistors.
FSO with 10 VDC.
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 10 VDC, unless otherwise noted.
Reduced performance outside compensation range, not tested in production.

NPI-15	Code	Pressure Port Type
↓	A	No port
	B	1/2-20 UNF
	H	1/4-18 NPT
	J	1/8-27 NPT
	↓	Code	Pressure Ranges (psi)
		500	500 psi (3447 kPa)
		1KØ	1000 psi (6894 kPa)
		3KØ	3000 psi (20,632 kPa) NPI-15A only
		5KØ	5000 psi (34,470 kPa) NPI-15A only
		↓	Code	Compensation
			A	Absolute
			S	Sealed Gauge
			↓	Code	Voltage
				V	Constant Voltage Excitation

NPI-15		-	-	-	(Typical Model Number)

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