Models 36, 37 UltraStable™
Medical Instrumentation
PC Board Mountable Pressure Sensor
0-100 mV Output
Gage Pressure
Wide Temperature Range
Calibration
Process Control
Factory Automation
Air Flow Management
Leak Detection
DESCRIPTION
The Models 36 and 37 are high performance, temperature
compensated, piezoresistive silicon pressure sensors packaged in
a differential TO-8 configuration. They provide excellent
performance and long-term stability.
Differential pressure ranges from 0-15 PSI to 0-250 PSI are
available. 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 in the Model 37 to
normalize pressure sensitivity variations by programming the
gain of an external differential amplifier. This provides
sensitivity interchangeability of ±1%.
Please refer to the low pressure section for information on
products with operating pressures less than 0-2 PSI. For an
uncompensated sensor (Model 35) please contact the factory for
FEATURES
TO-8 Package
-20°C to +85°C Compensated
Temperature Range
±0.1% Non-linearity
±0.5% Temperature Performance
1.0% Interchangeable Span
(provided by gain set resistor)
Solid State Reliability
Low Power
additional information.
DIMENSIONS
STANDARD RANGES
Range
0 to 15
0 to 30
0 to 50
0 to 100
0 to 250
psid
●
●
●
●
●
1-42
TO-8 – Wide Temperature Range
PC Board Mountable Pressure Sensor
PERFORMANCE SPECIFICATIONS
Supply Current:
1.5mA
Ambient Temperature:
25°C (Unless otherwise specified)
PARAMETERS
Full Scale Output Span, (without gain set resistor)
Zero Pressure Output
Pressure Non-linearity
Pressure Hysteresis
Input Resistance
Temperature Error – Span
Temperature Error – Zero
Temperature Coefficient - Resistance
Thermal Hysteresis – Zero
Short Term Stability of Offset
Short Term Stability of Span
Long Term Stability of Offset
Long Term Stability of span
Supply Current
Response Time (10% to 90%)
Output Noise
Output Load Resistance
Insulation Resistance (50 VDC)
Pressure Overload
Operating Temperature
Storage Temperature
Media
Weight
–40°C to +125°C
–50°C to +150°C
5
50
0.5
2500
0.05
0.01
3500
0.3
0.1
0.145
0.05
0.05
0.05
0.1
0.1
1.5
1.0
1.0
MIN
75
TYP
100
Models 36, 37 UltraStable™
MAX
150
2
0.1
0.1
4500
0.5
0.5
UNITS
mV
±mV
±% Span
±% Span
Ω
±% Span
±% Span
%/°C
±% Span
±% Span
±% Span
±% Span
±% Span
NOTES
1
3
2
3, 4
3, 4
4
4
11
11
12
12
5
6
7
8
13
9
2.0
mA
msec
µV p-p
MΩ
MΩ
3X
Rated
Non-corrosive Gases Compatible with Wetted Materials
3 Grams
10
Notes
1. Output span of unamplified sensor.
2. Best Fit Straight Line.
3. For Models 36, 37, compensation resistors are an integral part of the
sensor package; no additional external resistors are required. Pins 11
and 12 must be kept open. Model 37 is interchangeable only when used
with a gain stage as shown in the Gain Set Circuit.
4. Temperature range: -20°C to +85°C in reference to 25°C.
5. Guarantees input/output ratiometricity.
6. For a zero-to-full scale pressure step change.
7.
8.
9.
10.
11.
12.
13.
10 Hz to 1 kHz.
Prevents increase of TC-Span due to output loading.
3X or 500 psi maximum, whichever is less. 20 psi for 2 psi and 5 psi
versions.
Wetted materials are glass, ceramic, silicon, RTV, nickel, and aluminum.
Normalized offset bridge voltage: 7 days.
1 year.
Between case and sensing element.
CONNECTIONS
Model 36
Model 37
APPLICATION SCHEMATIC
ORDERING INFORMATION
April 2000
TO-8 – Wide Temperature Range
1-43
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