AMS4712 ANALOGMICRO | Alldatasheet
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Miniaturized pressure transmitter with 4 .. 20 mA output Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz March 2015 - Rev. 4.0 Phone:+49 (0)6131/91 0730-0 Fax: +49 (0)6131/91 073-30 Internet: www.analogmicro.de E–Mail: info@analogmicro.de
FEATURES
Calibrated and temperature compensated pressure sensor with two-wire 4 .. 20 mA current loop output Differential / gage, bidirectional differential, absolute and barometric versions Wide variety of pressure ranges: 5 mbar up to 2 bar Piezoresistive sensing element High precision digital signal conditioning High accuracy at room temperature Low overall error within a temperature range of -25 .. +85°C Supply voltage range: 8 .. 36 V Current limitation Protected against reverse polarity Compact and robust package Dust- and water-tight (IP67) M5 circular sensor connector Ready to use, simple and quick installation RoHS and REACH compliant TYPICAL APPLICATIONS Static pressure sensing Dynamic pressure sensing Barometric pressure sensing Vacuum measurement Level measurement Gas flow measurement Heating, Ventilation and Air Conditioning (HVAC) GENERAL DESCRIPTION AMS 4712 is a series of miniaturized pressure transmitters suitable for industrial applications and high precision measurement s. All AMS 4712 can be powered with in a supply voltage range of VS = 8 .. 36 V and provide an industrial two-wire 4 .. 20 mA current loop output. They are calibrated and temperature compensated in a wide temperature range of -25 .. +85°C. AMS 4712 comes in a robust plasti c package and is ready to use. Pressure is applied either via two barbed side ports for differential (relative) or bidirectional differential pressure transmitter types or via a single port for absolute or barometric types. The two -wire current loop output is established using an M5 circular sensor connector. AMS 471 2’s package is dust- and water -tight conforming to IP67. The pressure transmitters in the AMS 471 2 series are available for various applications and pressure ranges: Differential (relative) devi ces in pressure ranges from 0 .. 5 mbar up to 0 .. 2 bar, absolute pressure variants for 0 .. 1 bar and 0 .. 2 bar as Bidirectional differential devices are available from -5 .. +5 mbar up to -1 .. +1 bar for measurement of positive and negative pressure differences. Other pressure ranges are available on request.
Miniaturized pressure transmitter with 4 .. 20 mA output March 2015 - Rev. 4.0 Page 2/8 www.analogmicro.de PRESSURE RANGES Pressure transmitter type (code) Pressure type Pressure range in mbar Burst pressure1) in bar Pressure range in PSI Burst pressure1) in PSI Ultra low pressure AMS 4712-0005-D differential / relative 0 .. +5 >0.35 0 .. 0.073 Low pressure AMS 4712-0020-D differential / relative 0 .. 20 >0.5 0 .. 0.290 Standard pressure AMS 4712-0200-D differential / relative 0 .. 200 0 .. 2.901 >72 Table 1: AMS 4712 standard pressure ranges (other ranges on request) Notes: 1) Burst pressure is defined as the maximum pressure , which can be applied to one pressure port relative to the other port (or while only one pressure port is connected) without causing damages / leaks. MAXIMUM RATINGS Parameter Minimum Typical Maximum Units Absolute maximum supply voltage: Vmax 40 V Operating and storage temperature: T -25 85 °C Common mode pressure: pCM 1) 5 bar Table 2: Maximum ratings Notes: 1) Common mode pressure is defined as the maximum pressure, which can be applied simultaneously on both pressure ports of a differential or bidirectional transmitter without causing damages, while no differential pressure is applied.
Miniaturized pressure transmitter with 4 .. 20 mA output March 2015 - Rev. 4.0 Page 3/8 www.analogmicro.de SPECIFICATIONS All parameters apply to VS = 24 V, Top = 25°C and RL = 100 Ω, unless otherwise stated. Parameter Minimum Typical Maximum Units Current loop output signal @ specified minimum pressure (see “pressure ranges”)1) mA @ specified maximum pressure (see “pressure ranges”)1) 20 mA Full span output (FSO)2) 16 mA without pressure (only bidirectional differential types) 12 mA Accuracy3) @ Top = 25°C Ultra low pressure types (5, 10 mbar) ±1.0 ±1.5 %FSO Low pressure types (20, 50, 100 mbar) ±0.5 ±1.0 %FSO Standard pressure types (≥ 200 mbar) ±0.3 ±0.5 %FSO Overall error4) @ Top = -25 .. 85°C Ultra low pressure types (5, 10 mbar) ±1.5 ±2.5 %FSO Low pressure types (20, 50, 100 mbar) ±1.0 ±2.0 %FSO Standard pressure types (≥ 200 mbar) ±0.5 ±1.0 %FSO Long term stability < 0.5 %FSO/a Nonlinearity5) -0.3 < 0.1 0.3 %FSO Resolution analog output signal 0.05 %FSO Supply voltage (VS to Ground) VS,min 24 36 V Transmitter power consumption (IOUT = 20 mA, RL = 0 Ω) 0.48 W Current limitation IOUT,max 22.5 mA Protection against reverse polarity 40 V Response time (10% .. 90% rise time) 2,5 4 ms Load resistor RL 600 Ω Dependency of IOUT on VS 7) < 0.1 %FSO Pressure Changes 106 Compensated operating temperature range -25 85 °C Weight without cable 20 gram Media compatibility See notes8), 9) Protection classification10) IP67 Table 3: Specifications SPECIFICATION NOTES: 1) Pressure ranges are specified in Table 1. 2) The Full Span Output (FSO) is the algebraic difference between the current loop output at the specified minimum pressure and the current loop output at the specified maximum pressure (nominal FSO = 16 mA). 3) The accuracy is defined as the maximum deviation of the measurement value from the ideal transfer function at room temperature (RT) in %FSO including the adjustment error (offset and span), nonlinearity, pressure hysteresis and repeatability. Nonlinearity is the measured deviation from the best fit straight line (BFSL) across the entire pressure range. Pressure hysteresis is the maximum deviation of the output value at any pressure within the specified range when the pressure is cycled to and from the specified minimum or maximum pressure. Repeatability is the maximum variation of the output value at any pressure within the specified range over 10 pressure cycles.
Miniaturized pressure transmitter with 4 .. 20 mA output March 2015 - Rev. 4.0 Page 4/8 www.analogmicro.de 4) The overall error is defined as the maximum deviation of the measurement value from the ideal transfer function in %FSO across the entire temperature range (-25 .. 85°C). 5) Defined as best fit straight line (BFSL). 6) The minimum supply voltage VS,min depends on the used load RL and is given by VS,min = 8 V + 20 mA ∙ RL. 7) The given value is the maximum deviation from the output voltage at VS = 24 V over the complete supply voltage range at any pressure in the specified range. It is normalized to the FSO. 8) Media compatibility of pressure port 1 (for a description of port 1, see Figure 3): fluids and gases non-corrosive to ceramics, silicon, Pyrex, RTV silicone rubber and Zytel PA66. 9) Media compatibility of pressure port 2 (for a description of port 2, see Figure 3): clean, dry gases, non-corrosive to ceramics, silicon, RTV silicone rubber, gold, tin and Zytel PA66 (alkaline or acidic liquids can destroy AMS 4712) 10) With tubes connected at port 1 and port 2 for differential and bidirectional differential pressure transmitters and with a tube connected at port 2 for absolute and barometric pressure transmitters. FUNCTIONAL DESCRIPTION AMS 4712 uses a piezoresistive silicon chip as sensing element and a mixed-signal integrated circuit (ASIC) for signal conditioning, which are assembled on a ceramic substrate and housed in a robust plastic package. The physical pressure applied to the transmitter’s pressure ports is measured at AMS 4712’s piezores istive pressure sensing element, where the pressure is converted into a differential voltage signal, which is almost proportional to the pressure. Using the signal conditioning ASIC this differential voltage signal is converted into a standardized analog two-wire current loop output of IOUT = 4 .. 20 mA. The signal conditioning is done in the following way (see Figure 1): At first the sensing element’s differential voltage signal is pre-amplified and converted into a digital signal using a 14-bit A/D converter ( ADC). This digitized signal is processed mathematically by the ASIC’s integrated microcontroller unit. To achieve a calibrated and temperature compensated output signal the microcontroller unit uses individual correction coefficients and a mathematical correction algorithm, which are stored in the ASIC’s EEPROM during AMS 4712’s factory calibration process. The temperature value needed for the temperature compensation is measured directly at the piezoresistive sensing element, too. An 11-bit D/A converter (DAC) converts the corrected digital signal into a voltage signal, which is converted into a two-wire current loop output by the voltage-to-current converter. The standardized two-wire current loop output IOUT = 4 .. 20 mA (or 12 ± 8 mA for bidirectional di fferential types) is a linear function of the applied pressure.1 It is independent of the applied supply voltage. 1 The applied pressure is the pressure difference between port 1 and port 2 for differential and bidirectional differential pressure transmitters. For relative pressure types it is the pressure difference between port 1 and ambient pressure and for absolute and barometric pressure types it is the pressure at port 2 (for the definition of ports see Figure 3). Figure 1: AMS 4712’s block diagram
Miniaturized pressure transmitter with 4 .. 20 mA output March 2015 - Rev. 4.0 Page 6/8 www.analogmicro.de DIMENSIONS AND PINOUT Notes: 1. For absolute and barometric pressure transmitters only pressure port 2 is available. 2. Package material is Zytel PA66. 3. The electrical connection is established using an M5 sensor connector series 707 from Binder GmbH. 4. For pressure connections Analog Microelectronics recommends a silicone tubing (inner diameter ØID = 3.2 mm, outer diameter ØOD = 6.4 mm) or soft PU tubing (ØID = 4 mm, ØOD = 6 mm). 5. If silicone tubing is used it is recommended to use hose clamps to reduce the risk of leaks at high pressure. Figure 3: Dimensions and pinout of AMS 4712's package
Miniaturized pressure transmitter with 4 .. 20 mA output March 2015 - Rev. 4.0 Page 7/8 www.analogmicro.de INFORMATION FOR ORDERING Ordering code: Pressure range: Pressure range code mbar PSI kPa 0005 5 0.073 0.5 0010 10 0.145 1 0020 20 0.290 2 0050 50 0.725 5 0100 100 1.450 10 0200 200 2.901 20 0350 350 5.076 35 0500 500 7.251 50 1000 1000 14.50 100 1200 1200 17.40 120 2000 2000 29.01 200 Table 4: Pressure ranges Pressure type: Pressure type code Available pressure ranges D differential / relative (gage) 0 .. 5 mbar to 0 .. 2000 mbar D-B bidirectional differential -5 .. +5 mbar to -1000 .. +1000 mbar A absolute 0 .. 1000 mbar and 0 .. 2000 mbar B barometric (absolute) 700 .. 1200 mbar Table 5: Pressure types ADDITIONAL EQUIPMENT ORDER NUMBER DELIVERY FORM AMS4712-CABLE 3-wire cable with mating M5 sensor connector (2 m long) wiring: brown – V+, blue – NC, black – V- AMS4712-PU-TUBING matching soft PU-Tubing (please order in meters)
Miniaturized pressure transmitter with 4 .. 20 mA output March 2015 - Rev. 4.0 Page 8/8 www.analogmicro.de NOTES Analog Microelectronics GmbH reserves the right to amend any dimensions, technical data or other information contained herein wi thout prior notification.