MODEL 1240 UltraStable
PC Board Mountable Pressure Sensor
0-50 mV Output
Absolute, Differential, and Gage
Temperature Compensated
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Medical Instrumentation
Calibration
Process Control
Factory Automation
Air Flow Management
Leak Detection
DESCRIPTION
The Model 1240 is a high performance temperature compen-
sated, piezoresistive silicon pressure sensor packaged in
a dual-in-line configuration and intended for cost sensitive
applications where excellent performance and long-term
stability are required.
Integral temperature compensation is provided over a
range of -20°C to +85°C using laser-trimmed resistors. An
additional laser-trimmed resistor is included to normalize pres-
sure sensitivity variations, for interchangeability of ±1%.
Gage and Differential pressure ranges from 0-15 PSI to
0-100 PSI are available. Absolute pressure ranges of 0-15
PSIA and 0-30 PSIA are available. Multiple lead and tube
configurations are also available for customizing the package
for specific applications.
Please refer to the low pressure section for information on
products with operating pressures less than 0-2 PSI. For a
compensated sensor using a gain set resistor as opposed to a
current set resistor, please refer to the Model 1230.
Pressure
FEATURES
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Dual-In-Line Package
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-20°C to +85°C Compensated
Temperature Range
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±0.1% Non-linearity
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±0.5% Temperature Performance
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1.0% Interchangeable Span
(provided by gain set resistor)
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Solid State Reliability
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Low Power
STANDARD RANGES
Range
0 to 15
0 to 30
0 to 50
0 to 100
psia
psid
psig
DIMENSIONS
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I n t e r n e t : w w w. m s i u s a . c o m
Te l : 1 - 7 5 7 - 7 6 6 - 1 5 0 0
N o r t h A m e r i c a To l l F r e e : 1 - 8 0 0 - 7 4 5 - 8 0 0 8
Fax: 1-757-766-4297
1-21
H I T S –
W i d e Te m p e r a t u r e R a n g e
PC Board Mountable Pressure Sensor
MODEL 1240 UltraStable
PERFORMANCE SPECIFICATIONS
Supply Voltage: See application schematic.
Ambient Temperature: 25°C (Unless otherwise specified)
PARAMETERS
MIN
TYP
MAX
UNITS
NOTES
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Full Scale Output Span
49.5
50.0
50.5
mV
1, 3
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Zero Pressure Output
2
±mV
3
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Pressure Non-linearity
0.05
0.1
±% Span
2
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Pressure Hysteresis
0.01
0.1
±% Span
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Input Resistance
2500
3500
4500
Ω
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Temperature Error - Span
0.3
0.5
±% Span
3, 4
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Temperature Error - Zero
0.1
0.5
±% Span
3, 4
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Temperature Coefficient - Resistant
0.145
%/ºC
4
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Thermal Hysteresis - Zero
0.05
±% Span
4
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Short Term Stability of Offset
0.05
±% Span
13
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Short Term Stability of Span
0.05
±% Span
13
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Long Term Stability of Offset
0.1
±% Span
14
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Long Term Stability of Span
0.1
±% Span
14
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Response Time (10% to 90%)
1.0
msec
5
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Output Noise
1.0
µV p-p
6
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Output Load Resistance
5
MΩ
7
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Insulation Resistance (50 VDC)
50
MΩ
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Pressure Overload
3X
Rated
8
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Operating Temperature
–40°C to +125°C
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Weight
3 grams
Notes
1. Output span of unamplified sensor using current set resistor.
2. Best Fit Straight Line.
3. Compensation resistors are an integral part of the sensor package; no additional
external resistors are required. Pins 7 and 8 must be kept open.
4. Temperature range: -20 to +85°C in reference to 25°C.
5. For a zero-to-full scale pressure step change.
6. 10 Hz to 1 kHz.
7. Prevents increase of TC–Span due to output loading.
8. 3X or 200 psi maximum, whichever is less.
9. Wetted materials are glass, ceramic, silicon, RTV, nickel, gold, and aluminum.
10. Soldering of lead pins: 250°C for 5 seconds maximum.
11. Tube length: L=470 ± 5 mil, S=300 ± 3 mil, N=no tube.
12. Lead pins can either be in the same or the opposite direction as the pressure
tube. See Connections/Dimensions drawing for lead configurations.
13. Normalized offset bridge voltage: 7 days.
14. 1 year.
ORDERING INFORMATION
CONNECTIONS
1240 - 015 G - 3 S
Pressure Tubes (L, S, N - see note 12)
Lead Configuration (1, 3 - see note 13)
Type (G = Gage, A = Absolute, D = Differential)
Pressure Range
Model
APPLICATION SCHEMATIC
Nov 2002
H I T S –
W i d e Te m p e r a t u r e R a n g e
1-22
Pressure
Storage Temperature
–50°C to +150°C
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Media
Non-corrosive Gases Compatible with Wetted Materials
9
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Microchip MCU
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