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    I2C Pressure Sensor | Pa6DC

    Pressure Sensor With I2C Protocol Output, Short Lead Times, UK-Made
    Lead Time
    2 weeks
    Prices From
    1+ = £120.00
    100+ = £97.00
    (excl. VAT)
    Accelerated delivery available
    Quantity, OEM & educational discounts

    At a Glance

    • Ranges: 0-500mbar up to 0-700bar
    • Output: I2C
    • Environmental Protection: IP65 (IP67 optional)
    • Accuracy: <±0.25%/FS (<±0.1% optional)
    • Stainless Steel Construction
    • UK-Made
    • UK-Manufactured, Short Lead Times
    • I2C Protocol for Bi-Directional Data Transfer
    • Supports Multiple Masters and Multiple Slaves
    • IP65 Splash-Proof for Industrial Applications
    • 2 Week Delivery!
    • High-Volume Production Available
    • Customised & OEM Versions 

    Description

    Applied Measurements I2C pressure sensor Pa6DC uses an I2C (Inter-Integrated Circuit) protocol to communicate with the Master Controller.  The I2C output is ideal for OEM, machine feedback systems, control systems and automation applications.

    I2C Pressure Transducer Prices Start From:

    • 1+ = £120.00
    • 10+ = £115.00
    • 25+ = £108.00
    • 50+ = £102.00
    • 100+ = £97.00

    The benefit of using our I2C pressure transducer with an I2C interface is that it can be supported along with many I2C devices on the same circuit. I2C protocol allows an unlimited number of master devices to communicate with a maximum of 1008 slave devices on the bus. For example one Master with one Slave, multiple Masters with a single Slave, a single Master with multiple Slaves, or a Multi-Master with multiple Slaves. This I2C gas pressure sensor is designed to work as a Slave on an I2C protocol bus.

    As with most I2C devices, the I2C pressure sensor uses only 2 wires to transmit data between the devices on the system (2 further wires are required from the pressure sensor for the +ve and -ve supply, see I2C protocol diagram below).

    The pressure sensor’s housing is constructed from 303 stainless steel (alternative materials including 316 stainless steel and PVDF are available) and utilises a ceramic sensing diaphragm (96% aluminium oxide Al2O3), a Viton O-ring and a G¼ inch male process connection as standard, giving the sensor an IP65 splashproof protection rating.

    Thanks to its IP65 sealing, it can be used for the measurement of gas and liquid pressure in many I2C industrial applications.

    We can easily accommodate any requirement from one-off to bulk orders for many thousands of sensors, all within our in-house, UK production facility.

    Alternate casing and construction materials, O-rings and process connections can all be offered, including G¼” female and ¼” NPT male connectors.  Should you require a pressure sensor tailored to your specific pressure measurement application, we can design and manufacture fully customised sensors for you – please contact our friendly sales team to discuss your requirements in detail.

    How I2C Protocol Works

    I2C communication protocol uses 2 wires to transmit information between the Master and the Slave on an I2C bus, the SDA and the SCL. The Serial Data Line (SDA) carries the data bi-directionally between the Master and the Slave device. The Serial Clock Line carries the clock signal ensuring the Slave and the Master’s clock are synchronised. The Clock signal is always controlled by the Master.

    Each I2C device connected to the bus has a unique address. This is used by the Master to differentiate between the various Slave devices on the I2C bus. The I2C pressure sensor works as a Slave on the bus.

    I2C Bus Illustration

    Benefits of an I2C Communication Bus

    • Easy to add on, remove and modify the design by easily clipping on and clipping off the I2C devices.
    • Easy to install as the I2C communications protocol is already embedded on the chip inside the sensor.
    • Simple 2-wire data transfer.
    • Easy fault finding with the unique address of every I2C-connected device.
    • Low current consumption.

    I2C Data Transfer Sequence

    Data is transferred between the Master and the Slave in Frames making up a single Message. Each message will always begin with the START condition followed by the unique address of the I2C Slave device. Below is an example of how a Master will send data to and from an I2C Industrial Pressure Sensor.

    • The Master begins by sending a START command to the unique address ID of the Slave it wants to communicate with.
    • The Master then tells the Slave whether it wants to send data to it (WRITE) or receive data from it (READ).
    • The Slave acknowledges whether or not it has received the command. 0 = Acknowledge, 1 = Not Acknowledged.
    • Once the 0 (ACK) is received by the Master, the Master then transfers the data to the Slave in 8 bits packet.
    • The Master sends the STOP command when the data sequence has been transferred.
    I2C COMMAND PROTOCOL SEQUENCE

    Technical Specifications

    Nominal Pressure RangeBar (gauge, absolute or sealed gauge)0-0.50-10-20-50-100-200-500-1000-2500-4000-6000-700
    Compound RangesBar--1…0 *-1…+2 *-1…+5-1…+9-1...+19-1...+29-----
    Permissible OverpressureBar124102040100200400575800800
    Burst Pressure Bar245122550120250500650950950
    *<±0.1% / FS (BFSL) accuracy not possible in these ranges
    Output Signal & Supply VoltageWiring SystemOutputSupply VoltageInput Current
    Pa6DC4-wireI2C2.7-5.5Vdc<3mA
    Performance
    Accuracy (non-linearity, hysteresis, repeatability)±%/Rated Output (BFSL)<±0.25
    <±0.1 optional
    Zero Balance±% of Rated Output<1.0
    Setting Errors (offsets)Zero & Full Scale, <±0.5% / FS
    Influence EffectsSupply Effects<0.005 % FS / 1V
    Response Time (10% - 90%)ms≤10
    Warm-Up Timems500 typ.
    Permissible Temperatures & Thermal Effects
    Media Temperature
    (Note: subject to 'O' ring seal, see below)
    ˚C-40 to +135
    Ambient Temperature˚C-20 to +85
    Storage Temperature˚C-20 to +85
    Compensated Temperature Range˚C+20 to +80
    Thermal Zero Shift (TZS)% / FS / ˚C<±0.04 (standard)
    <±0.02 (option)
    <±0.01 (option)
    Thermal Span Shift (TSS)% output / ˚C<±0.015 typical
    Electrical Protection
    Reverse Polarity ProtectionNo damage but also no function
    Electromagnetic CompatibilityCE Compliant
    Insulation ResistanceMegohms Ω at 50V dc>500
    Mechanical Stability
    Shock100 g / 11 ms
    Vibration10 g RMS (20 ... 2000 Hz)
    Materials
    Housing & Process Connection303 Stainless Steel
    316L Stainless Steel (optional)
    ‘O’ Ring Seals
    (inc. Temperature Range)
    Viton (-20ºC to +135ºC)
    NBR/Nitrile (-40ºC to +100ºC) (optional)
    EPDM (-40ºC to +130ºC) (optional)
    Chemraz (-10ºC to +135ºC) (optional)
    DiaphragmCeramic Al2O3 96 %
    Media Wetted PartsHousing and process connection, ‘O’ ring seal, diaphragm
    Misc
    Weightgrams100 nominal
    Installation PositionAny
    Operational Lifepressure cycles> 100 x 106
    Environmental ProtectionCable Gland
    M12 x 1 Connector
    M12 x 1 Connector
    IP65
    Gauge Reference ≤ 50bar : IP65 /
    Absolute, Sealed Gauge or >50bar Range : IP67

    Product Dimensions

    I2C Pressure Sensor Pa6DC M12 Outline

    I2C Pressure Sensor Pa6DC M12 Outline

    I2C Pressure Transducer Pa6DC Gland Outline

    I2C industrial pressure sensor gland outline drawing

    Wiring Details

    Electrical Connection Type+ve Supply-ve SupplySCLSDA
    M12x1 ConnectorPin 1Pin 2Pin 3Pin 4
    Cable GlandRedBlueGreenYellow

    Ordering Codes & Options

    Pa6DCM-10barg-A4AV-00-000Pa6DCM-10barg-A4AV-00-000
    Product Family
    Pa6DPa6D
    Electrical Output
    C = I2CC
    Electrical Connection / ATEX Certification
    C = IP65 Cable Gland + Screened, Un-Vented PVC CableC
    M = M12x1 4-pin ConnectorM
    MM = M12x1 4-pin Connector + Mating HalfMM
    Pressure Range
    10barg = 0 to 10bar gauge10barg
    M1P1barg = -1 to +1bar gaugeM1P1barg
    5bara = 0 to 5bar absolute5bara
    2400psig = 0 to 2400psi gauge2400psig
    Accuracy (Non-Linearity & Hysteresis)
    A = <±0.25%/FS (standard)A
    B = <±0.1%/FSB
    Zero Temperature Compensation (TZS)
    4 = <±0.04%/FS/ºC4
    2 = <±0.02%/FS/ºC2
    1 = <±0.01%/FS/ºC1
    Continued on next page
    Process Connection
    A = G¼” Male DIN 3852 in 303 St/SteelA
    B = G¼” Male DIN 3852 in 316L St/SteelB
    C = ¼” NPT Male 303 St/SteelC
    D = 7/16 UNF-20 MaleD
    E = G¼” Female in 303 St/SteelE
    F = G¼” Male DIN 3852 in PVDF (Polyvinylidene Fluoride)F
    S = 9/16 UNF Internal (no bleed hole)S
    O-Ring Material
    V = Viton (FKM)V
    N = Nitrile (NBR)N
    E = EPDM (Ethylene Propylene Diene Monomer)E
    C = Chemraz (Perfluoroelastomer)C
    Cable Length (in metres)
    00 = None00
    01 = 1 metre01
    04 = 4 metres (maximum allowed)04
    Specials Code
    000 = No Special Requirements000
    010 = Cleaned for Oxygen Service010

    I2C (I²C) Communication Information

    I2C Slave Default address: 00Clock Frequency: 400 kHz
    Data is 24 bit unsigned absolute valueNOTE: Address Values in Hex
    Calibration Data Memory Locations
    16 bit Device Serial Number:
    ● NVM Address 00: bits 0 to 15 (LSB)
    ● NVM Address 01: bits 16 to 23 (MSB)
    16 bit Device Zero Pressure Range:
    ● NVM Address 2A: bits 0 to 15
    24 bit Corrected ZERO calibration reading:
    ● NVM Address 24: bits 0 to 15 (LSB)
    ● NVM Address 25: bits 16 to 23 (MSB)
    16 bit Device Full Scale Pressure Range:
    ● Address 2C: bits 0 to 15
    24 bit Corrected FULL SCALE calibration reading:
    ● NVM Address 26: bits 0 to 15 (LSB)
    ● NVM Address 27: bits 16 to 23 (MSB)
    16 bit Device Zero Decimal Place:
    ● NVM Address 2B: bits 0 to 15
    16 bit Device Full Scale Decimal Place:
    ● NVM Address 2D: bits 0 to 15
    16 bit Device Pressure Engineering Units:
    ● Address 29: bits 0 to 15
    0001 - mbar
    0002 - Bar
    0003 - Psi
    16 bit Device Pressure Datum Type:
    ● Address 2E: bits 0 to 15
    0000 - Gauge
    0001 - Absolute 0002 - Sealed Gauge
    Reading a Memory Location
    To get the data, read out 3 bytes:● Byte 1 = Status byte (If not required, ignore)
    ● Byte 2 = NVM Memory data (bits 15:8)
    ● Byte 3 = NVM Memory data (bits 7:0)
    Example:
    Serial number read: 71652
    00Hex = LSB = 17E4
    01Hex = MSB = 1
    Reading the Pressure Data
    To read a register use the memory location as the command
    To initiate a pressure reading use one of the following commands:● A single reading command: AAhex
    ● An average of 4 consecutive readings : ADhex
    ● An average of 8 consecutive readings : AEhex
    To acquire pressure data read 4 bytes:● Byte 1 = Status byte (ignore)
    ● Byte 2 = Sensor data (bits 23:16)
    ● Byte 3 = Sensor data (bits 15:8)
    ● Byte 4 = Sensor data (bits 7:0)

    Note: data is only available once per issuance of a read command.

    Below is an example of a 0 to 10 Bar absolute pressure range, the NVM would look like this:

    • 2A (Zero pressure range) = 0000
    • 2B (Zero decimal place) = 0000
    • 2C (Full scale pressure range) = 000A
    • 2D (Full scale decimal place) = 0000
    • 29 (Pressure engineering units) = 0002
    • 2E (Pressure datum type) = 0001

    An example of typical calibration figures would look something like this:

    • 24 (Zero calibration LSB) = 4563
    • 25 (Zero calibration MSB) = 0019
    • *When converted from HEX, 0019 4563 to decimal = 1656163
    • 26 (Full scale LSB) = 4C8E
    • 27 (Full scale MSB) = 00E6
    • *When converted from HEX, 00E6 4C8E to decimal = 15092878

    This, therefore, means that 0 Bar Absolute pressure = 1656163 and 10 Bar absolute pressure = 15092878 giving a span of 13436715 for 10 bar.

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