85BSD Digital Output
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Weldable or threaded process fittings
Pressure/temperature read-out
Digital output
ASIC calibrated
Absolute, gage
Cable/connector option
Low power option
13mm diaphragm diameter
DESCRIPTION
The 85BSD is a small profile, media compatible, piezoresistive silicon pressure sensor packaged in a 316L
stainless steel housing. This 14-bit digital output pressure sensor supports I2C and SPI interface protocols in
either a 3.3 or 5.0Vdc supply voltage, and is designed to be weldable or threaded with process fittings. The
sensing package utilizes silicone oil to transfer pressure from the 316L stainless steel diaphragm to the sensing
element.
The 85BSD is designed for high performance, low pressure applications. A custom ASIC is used for
temperature compensation, offset correction, and provides a digital output of 10~90% or 5~95%.
For a similar sensor with o-ring mounting, refer to the 86BSD digital output pressure sensor.
FEATURES APPLICATIONS
Weldable or threaded process fittings
Level controls
±0.25% Accuracy
Tank level measurement
±1.0 Total Error Band
Corrosive fluids and gas measurement systems
Cable/connector option
Sealed systems
Low power option
Manifold pressure measurement
I2C or SPI Interface protocols
Barometric pressure measurement
Submersible depth monitoring
STANDARD RANGES
Range
psiG
psiA
Range
BarG
BarA
0 to 005
0 to .35
0 to 015
0 to 001
0 to 030
0 to 002
0 to 050
0 to 005
0 to 100
0 to 007
0 to 150
0 to 010
0 to 200
0 to 014
0 to 300
0 to 020
Intermediate pressure ranges available, contact factory
85BSD Digital Output
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PERFORMANCE SPECIFICATIONS
Supply Voltage: 3.3Vdc
Ambient Temperature: 25°C (unless otherwise specified)
PARAMETERS
MIN
TYP
MAX
UNITS
NOTES
Zero Pressure Output (10% ~ 90%)
666
Count Hex
1
Zero Pressure Output (5% ~ 95%)
333
Count Hex
1
Full Scale Pressure Output (10% ~ 90%)
399A
Count Hex
1
Full Scale Pressure Output (5% ~ 95%)
3CCB
Count Hex
1
Accuracy
-0.25
0.25
%Span
2
Total Error Band
-1
1
%Span
3
Pressure Resolution
0.008
%Span
Temperature Accuracy
-1.5
1.5
°C
4
Temperature Resolution
0.1
°C
Input Voltage Range
2.7
3.3
5.5
V
1
Supply Current
3
mA
Insulation Resistance (50Vdc)
50
MΩ
5
Overpressure
2X
Rated
6
Burst Pressure
3X
Rated
7
Load Resistance (RL)
10
KΩ
Long Term Stability (Offset & Span)
±0.5
%Span/Year
Compensated Temperature (≤5psi)
0
50
°C
Compensated Temperature (≥15psi)
-20
+85
°C
Operating Temperature
-40
+125
°C
8
Storage Temperature
-40
+125
°C
8
Output Pressure Resolution
14
Bits
Output Temperature Resolution
8
11
Bits
Start Time to Data Ready
8.4
ms
9
Output Type
10% to 90% or 5% to 95%
Interface Type
I2C (ADDR, 0x28H)
I2C (ADDR, 0X36H)
I2C (ADDR, 0x46H)
SPI
Media – Pressure
Liquids and gases compatible with 316/316L Stainless Steel
Notes
1. Measured at vacuum for absolute(A), ambient for gage(G) and sealed gage(S). Output is not ratiometric to supply voltage.
2. Accuracy: combined linearity, hysteresis and repeatability.
3. Total Error Band: includes calibration errors and temperature effects over the compensated range. See Figure 3.
4. The deviation from a best fit straight line (BFSL) fitted to the output measured over the compensated temperature range. For errors
beyond the compensated temperature range, See Figure 2.
5. Between case and sensing element.
6. 2X or 400psi, whichever is less. The maximum pressure that can be applied to a transducer without changing the transducer’s
performance or accuracy.
7. 3X or 600psi, whichever is less. The maximum pressure that can be applied to a transducer without rupture of either the sensing
element or transducer.
8. Maximum temperature range for product with standard cable and connector is -20°C to +105°C.
9. Start time to data ready is the time to get valid data after POR (Power on Reset). The time to get subsequent valid data is then
specified by the response time specification.
Additional Notes
Sharp edge strongly recommended for welding applications. Optimum weld parameters will reduce the effect of weld heat on sensor
performance. Devices with lower pressure ranges have greater susceptibility to heat generated during the weld process.
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DIMENSIONS
85BSD Digital Output
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BLOCK DIAGRAM
85BSD Digital Output
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TEMPERATURE ACCURACY / TOTAL ERROR BAND
85BSD Digital Output
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PRESSURE TRANSFER FUNCTIONS
85BSD Digital Output
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TEMPERATURE TRANSFER FUNCTIONS
85BSD Digital Output
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85B S D 015P A 4 - 3 A I C L
Supply Voltage (3 = 3.3Vdc, 5 = 5.0Vdc)
Pressure Range
Stainless Steel
Digital Output
Model
Type (A = Absolute, G = Gage)
Interface (I = I2C (ADDR. 0X28H, J = I2C (ADDR. 0X36H),
Output (A = 10~90%, B = 5~95%)
K = I2C (ADDR. 0X46H, S = SPI)
Connection (P = Pads, R = Ribbon Cable, C = Cable w/ Connector)
Low Power (Blank = None, L = Low Power)
Fitting (See Fitting Table)
ORDERING INFORMATION
NORTH AMERICA
EUROPE
ASIA
Measurement Specialties
45738 Northport Loop West
Fremont, CA 94538
Tel: 1-800-767-1888
Fax: 1-510-498-1578
Sales: pfg.cs.amer@meas-spec.com
Measurement Specialties
(Europe), Ltd.
26 Rue des Dames
78340 Les Clayes-sous-Bois, France
Tel: +33 (0) 130 79 33 00
Fax: +33 (0) 134 81 03 59
Sales: pfg.cs.emea@meas-spec.com
Measurement Specialties
(China), Ltd.
No. 26 Langshan Road
Shenzhen High-Tech Park (North)
Nanshan District, Shenzhen 518057
China
Tel: +86 755 3330 5088
Fax: +86 755 3330 5099
Sales: pfg.cs.asia@meas-spec.com
The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for
inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the
manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to any product herein. Measurement
Specialties, Inc. makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does
Measurement Specialties, Inc. assume any liability arising out of the application or use of any product or circuit and specifically disclaims
any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different
applications. All operating parameters must be validated for each customer application by customer’s technical experts. Measurement
Specialties, Inc. does not convey any license under its patent rights nor the rights of others.
