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NPI-19 Series  
NovaSensor Low  
Pressure Sensors  
Features  
Applications  
• Solid state, high reliability  
• 316L stainless steel, ISO sensor design  
• ±0.5% static accuracy  
• Process control systems  
• Hydraulic systems and valves  
• Biomedical instruments  
• Temperature compensated 32°F to 158°F (0°C to • Refrigeration and HVAC controls  
70°C)  
• Appliances and consumer electronics  
• 125 mV typical FSO on current version  
• Ship and marine systems  
• 75 ±1 mV FSO on voltage version  
• Aircraft and avionic systems  
• Thermal errors less than 2% FSO  
NPI media isolated sensors are designed to  
• Two standard ranges:  
0 to 2.5 psig (0 to 172 mBar)  
0 to 5 psig (0 to 345 mBar)  
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 measured media by a stainless steel  
diaphragm and body. The NPI Series employs  
SenStable® processing technology, providing  
excellent output stability. It is available in either a  
constant current or constant voltage version.  
• Standard configurations include:  
0.74 in (19 mm) diameter x 0.28 in (7.1 mm) long  
cylinder with o-ring seals  
• Custom configurations and other pressure  
ranges available. Please consult the factory.  
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. Please consult  
NovaSensor for more details.  
Amphenol  
Advanced Sensors  
NPI-19 Series  
Specifications  
Operating  
Constant Current (1.5 mA)  
Constant Voltage (10 V)  
Value  
Value  
Notes  
Notes  
General  
Pressure Ranges  
2 .5 PSI  
0 to 2.5 psi (0 to 172 mbar)  
17.2 kPa  
34.5 KPa  
rated  
0 to 2.5 psi (0 to 172 mbar)  
0 to 5 psi (0 to 345 mbar)  
3x pressure  
17.2 kPa  
34.5 KPa  
rated  
5 PSI  
0 to 5 psi (0 to 345 mbar)  
3x pressure  
Maximum Overpressure  
Electrical @ 77°F (25°C) unless otherwise stated  
Input Excitation  
1.5 mA maximum  
108 Ω  
2 mA maximum  
@ 50 VDC  
typical  
10 VDC  
108 Ω  
12 VDC  
@ 50 VDC  
typical  
±20%  
Insulation Resistance  
Input Impedance  
Output Impedance  
Bridge Impedance  
Environmental  
4000 Ω  
10,000 Ω  
5000 Ω  
5000 Ω  
5000 Ω  
±20%  
5000 Ω  
±20%  
±20%  
Compensated Temperature  
Operating Temperature  
Storage Temperature  
Mechanical  
32°F to 158°F  
14°F to 176°F  
-40°F to 257°F  
(0°C to 70°C)  
32°F to 158°F  
14°F to 176°F  
-40°F to 257°F  
(0°C to 70°C)  
(-10°C to 80°C)  
(-40°C to 125°C)  
(-10°C to 80°C)  
(-40°C to 125°C)  
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  
All corrosive media compatible with 316 L  
stainless steel  
Case and Diaphragm  
Material  
316L stainless steel  
316L stainless steel  
Recommended O-Ring  
NPI-19A; 0.66 in x 0.039 in (16.76 mm x 1 mm)  
NPI-19A; 0.66 in x 0.039 in (16.76 mm x 1 mm)  
Compensated  
Performance  
(1.5 mA)  
(10 VDC)  
Parameter Notes Units  
Minimum  
Type  
Maximum  
Units  
Minimum Type  
Maximum  
Offset  
mV  
-2  
±1  
2
mV  
-2  
±1  
2
Full Scale Output  
2.5 PSI  
mV  
50  
125  
125  
0.1  
200  
200  
0.5  
mV  
72  
75  
75  
0.1  
78  
76  
0.5  
5 PSI  
mV  
50  
mV  
74  
Static Accuracy  
%FSO  
-0.5  
%FSO  
-0.5  
2
Thermal Accuracy of Offset  
2.5 PSI  
5 PSI  
%FSO  
%FSO  
-2  
±0.5  
±0.5  
2
%FSO  
%FSO  
-2  
±0.5  
±0.5  
2
3
-1.5  
1.5  
-1.5  
1.5  
3
Thermal Accuracy of FSO  
2.5 PSI  
5 PSI  
%FSO  
%FSO  
-2  
±0.5  
±0.5  
2
%FSO  
%FSO  
-2  
±0.5  
±0.5  
2
3
3
-1.0  
1.0  
-1.0  
1.0  
Thermal Repeatability  
2.5 PSI  
5 PSI  
%FSO  
%FSO  
-0.3  
-0.2  
0.1  
0.1  
0.3  
0.2  
%FSO  
%FSO  
-0.2  
-0.2  
0.1  
0.1  
0.2  
0.2  
3
3
1. Performance with offset, thermal accuracy of offset, and thermal accuracy of FSO compensation resistors. All values measured at 77°F  
(25°C) and at 1.5 mA constant current or 10 VDC, unless otherwise noted.  
2. Includes Linearity (BFSL), pressure hysteresis and repeatability errors.  
3. 32°F to 158°F (0°C to 70°C) with reference to 77°F (25°C).  
4. Consult factory for vacuum applications.  
A
NPI-19 Series  
-Out  
+In  
Specifications  
R1  
D
Ordering Information  
4
R2  
The code number to be ordered may be specified as follows:  
NPI-19 NovaSensor Pressure Type (ISO Sensor)  
B
C
Code  
Pressure Port Type  
A
No port, o-ring seal  
+Out  
-In  
5
Code  
021  
002  
031  
005  
Pressure Range  
3
2.5 psi (172 mbar), 1.5 mA  
2.5 psi (172 mbar), 10 V  
5 psi (345 mbar), 1.5 mA  
5 psi (345 mbar), 10 V  
R5  
R3  
R4  
2
1
Code  
G
Description  
Gauge  
Code  
Tolerance  
Constant Current Supply  
(1.5 mA)  
H
Pin number 4 connected to chip substrate.  
V
Constant Voltage Supply  
(10 VDC)  
Constant current schematic diagram  
NPI-19 - ____ -  
____ -  
____ -  
____ Typical model number  
A
-Out  
+In  
R1  
D
4
R6  
R2  
B
C
+Out  
-In  
5
3
R5  
R3  
R4  
2
1
R7  
0.05 in  
(1.4 mm)  
Constant voltage schematic diagram  
Ø 0.56 in  
(14.2 mm)  
O-ring area*  
Flat 2 in (50 mm) long  
Tig weld  
nylon flex cable (standard)  
Port type A has no internal and  
external chamber for welding  
3
4
2
5
Ceramic  
substrate  
1
B
C
D
A
Spacer  
0.2 in  
(5.05 mm)  
0.12 in  
(3.05 mm)  
Ø 0.74 in (18.8 mm) minimum  
Ø 0.745 in (18.9 mm) maximum  
0.46 in (11.8 mm) minimum  
0.53 in (13.58 mm) maximum  
*Uses o-ring 0.66 in ID x 0.039 in (16.76 mm x 1 mm) cross section.  
www.amphenol-sensors.com  
© 2014 Amphenol Corporation. All Rights Reserved. Specifications are subject to change without notice.  
Other company names and product names used in this document are the registered trademarks or  
trademarks of their respective owners.  
Amphenol  
Advanced Sensors  
AAS-920-298B-06/2014