ETC 37-250G

Models 36, 37 UltraStable™
þ
Medical Instrumentation
PC Board Mountable Pressure Sensor
þ
Calibration
0-100 mV Output
þ
Process Control
Gage Pressure
þ
Factory Automation
Wide Temperature Range
þ
Air Flow Management
þ
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
additional information.
þ
TO-8 Package
þ
-20°C to +85°C Compensated
Temperature Range
þ
±0.1% Non-linearity
þ
±0.5% Temperature Performance
þ
1.0% Interchangeable Span
(provided by gain set resistor)
þ
Solid State Reliability
þ
Low Power
DIMENSIONS
STANDARD RANGES
Range
1-42
psid
0 to 15
●
0 to 30
●
0 to 50
●
0 to 100
●
0 to 250
●
TO-8 – Wide Temperature Range
Models 36, 37 UltraStable™
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)
MIN
TYP
MAX
UNITS
NOTES
75
100
150
mV
1
2
±mV
3
0.1
±% Span
2
±% Span
Zero Pressure Output
Pressure Non-linearity
0.05
Pressure Hysteresis
0.01
0.1
3500
4500
Ω
Temperature Error – Span
0.3
0.5
±% Span
3, 4
Temperature Error – Zero
0.1
0.5
±% Span
3, 4
4
Input Resistance
2500
Temperature Coefficient - Resistance
0.145
%/°C
Thermal Hysteresis – Zero
0.05
±% Span
4
Short Term Stability of Offset
0.05
±% Span
11
11
Short Term Stability of Span
0.05
±% Span
Long Term Stability of Offset
0.1
±% Span
12
Long Term Stability of span
0.1
±% Span
12
Supply Current
0.5
1.5
Response Time (10% to 90%)
Output Noise
Output Load Resistance
mA
5
1.0
msec
6
1.0
µV p-p
7
MΩ
8
MΩ
13
Rated
9
5
Insulation Resistance (50 VDC)
50
Pressure Overload
Operating Temperature
2.0
3X
–40°C to +125°C
Storage Temperature
–50°C to +150°C
Media
Non-corrosive Gases Compatible with Wetted Materials
Weight
3 Grams
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.
CONNECTIONS
Model 36
7.
8.
9.
10.
11.
12.
13.
10
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.
APPLICATION SCHEMATIC
Model 37
ORDERING INFORMATION
April 2000
TO-8 – Wide Temperature Range
1-43