View ASL1600_37310.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

www..com
PRELIMINARY DATA
ASL1600
Media Isolated Liquid Mass Flow Meter
- - - - - Totally non-invasive Maximum flows up to 4 ml/min Resolutions down to 100 nl/min Response time 30 ms RS-232 digital interface
May 07 V0.7
ASL1600 Product Summary
The ASL1600 Liquid Mass Flow Meter enables extremely fast and accurate measurements of ultra low liquid mass flows. This particularly small and light device operates with total media isolation, hardly any dead volume and no moving parts. The unique perform ance of this Swiss made device is based on Sensirion's unsurpassed CMOSens(R) sensor technology which combines a high precision thermal sensor element with the amplification and A/D converter circuit and digital signal processing on one single CMOS chip. This results in superior resolution, fast response time and large dynamic range at low power consumption. All measurement data is fully calibrated and temperature compensated by means of an internal microcontroller. Excellent chemical resistance and bio-compatibility are ensured. The medium only gets in contact with the straight sensor capillary made of Duran(R)- (borosolicate glass 3.3), with the PEEKTM-fittings and with Teflon(R) used as sealing material. Typical applications for this sensor include precise liquid mass flow and volume measurement for analytical instruments, medical devices, process control. The ASL1600 requires a supply voltage of 7...18 VDC and provides an RS-232 compliant digital interface.
CMOSens(R) Technology
CMOSens(R) is the base technology for all Sensirion microsensor products. The unification of CMOS and sensor technology serves as a platform for highly integrated system solutions with excellent sensor precision and reliability. Inside the ASL1600 the on-chip sensor element forms an integrated whole with a highend amplification A/D converter circuit. Due to this compact single-chip design, CMOSens(R) based sensors are very resistant to electromagnetic disturbances (EMC), another important technical advantage of this state of the art sensor technology. As a result, CMOSens(R) based sensor modules offer excellent sensor precision, fast response time and a very large dynamic measurement range. In addition, the digital intelligence of the CMOSens(R) sensor technology enables digital interfaces that permit an easy link with the system of the customer, a real advantage and benefit that results in ready-to-use problem solutions. The core element of CMOSens(R) liquid mass flow sensors is formed by mounting the highly sensitive microchip on the outside of a straight glass capillary (US Patent 6,813,944 B2). The liquid mass flow in the capillary is measured through the tubing material guaranteeing a total media isolation.
Enlarged View
Digital Signals from Chip CMOS Sensor Chip
Calorimetric Sensing Principle
Measure through tubing material
Sensor Capillary
www.sensirion.com
May 2007 V0.7
1/8
www..com
ASL1600 Liquid Mass Flow Meter
1
Liquid Mass Flow Sensor Performance
Parameter Liquid Flow Sensor Maximum Flow (bi-directional) Calibrated Minimum Flow Accuracy d Best Resolution b Pressure Drop Repeatability Overpressure related Offset Overpressure Resistance e Flow Detection Response Time Digital Sampling Time (Data Readout) Operating Temperature Temperature Coefficient Mounting Orientation Sensitivityf Temperature Sensor Dynamic Range Resolution Accuracy
Flow Calibrated Minimum Flow Flow Calibrated Minimum Flow
Table 1: Overview ASL1600 Liquid Flow Sensor Performance (all data for 23C, 1 barabs unless otherwise noted).
Condition ASL1600-10 1000 40 3.0 a,d 0.15 a,d 0.1 1.5 <100 <0.8 0 5 30 5 +0...+60 <0.2 <0.4 <1.5 ASL1600-20 4000 200 3.0 a,d 0.15 a,d 0.3 d 5.0 <100 <0.8 0 3 30 5 +0...+60 <0.2 <0.4 <3 Units l/min l/min % of measured value % of full scale l/min l/min Pa c % of measured value % FS / bar bar b ms ms C % MV / K % MV / K % of full scale
at calibrated min. flow at maximum flow at maximum flow reference conditions d
depends on resolution setting (see Table 2) avoid freezing
25%...75% of max. flow <25% or >75% of max flow
Measures temperature inside the sensor chip, but not of the surrounding air g +10...50 +10...50 C 0.1 0.1 C 3 3 C
Table 2: Resolution at Different Flow Levels and Integration Times C Sensor Resolution
Readout Frequency 200 Hz Readout Frequency 50 Hz Readout Frequency 12.5 Hz Readout Frequency 1.56 Hz
Best Resolution to be multiplied by ... Mass Flow Integration Time
64 5 ms
16 20 ms
4 80 ms
1 640 ms
Better available on request. For best results allow the sensor to warm up. See Table 2 c 1 bar = 100 000 Pa = 0.9869 atm = 401.9 inch H2O = 14.5 psi d Reference conditions: 1 barabs, T= 20C, medium H2O, vertical mounting (electrical connector up) e Overpressure in operation; High overpressure resistance for OEM-solutions on request f For low flow measurements with high accuracy vertical mounting position (connector up) is recommended g The chip warms up by about 4K (depending on supply voltage and ventilation)
a b
www.sensirion.com
May 2007 V0.7
2/8
www..com
ASL1600 Liquid Mass Flow Meter
1.1 Sensor Principle and Liquid Media
The ASL1600 device detects liquid mass flow by measuring heat transfer through the tubing material of a glass capillary. On a microchip outside the capillary, a heating resistor on a thermally optimized membrane is kept above ambient temperature. In the presence of liquid flow inside the capillary, the temperature distribution up- and downstream is disturbed. This asymmetry is then measured. Due to the minimal thermal mass of the system, symmetrical arrangement, and accurate temperature measurement, the revolutionary specifications of the ASL1600 devices are achieved while providing total media isolation. The above-mentioned thermal principle depends on the physical properties of the liquid used. The ASL1600 is calibrated for water only but the use of other liquids is also possible. The sensor guarantees an outstanding repeatability for a wide range of different media though offset, sensitivity and measurement range may change. It is recommended to characterize the sensor output separately when starting to perform such measurements. Units calibrated directly for other liquid types are available on request when high volumes are needed.
1.3 Raw Data Mode
For applications where high repeatability is most important and different types of media are used, the sensor can be switcheda to raw data mode. By doing this non-linear effects can be monitored without influence of the internal calibration data. Figure 2 shows the applied liquid flow vs. the digital output of the ASL1600 in raw data mode.
30000
25000
20000
ticks [-]
15000
10000
5000
0 -20
-15
-10
-5
0
5
10
15
20
flow
Figure 2: Qualitative transfer characteristics of ASL1600 in raw data mode.
1.2 ASL1600 Transfer Characteristics
Figure 1 shows the applied liquid flow vs. the digital output of the ASL1600-20. The characteristics is linear for the medium water. Beyond the limits of the output (ca. calibrated maximum flow + 10%), the signal remains constant.
5000
1.4 Offset
After exposing the sensor to extreme conditions or when using other media than water a slight offset on the sensor output may occur. In this case an offset correctiona may be useful if best accuracy is needed.
ASL1600-20 output [l/min]
4000 3000 2000 1000 0 -1000 -2000 -3000 -4000 -5000 -4800 -2800 -800 1200 3200
Mass Flow [l/min]
Figure 1: ASL1600 transfer characteristics for H2O calibrated output
a
Ask for support for this operation 3/8
www.sensirion.com
May 2007 V0.7
www..com
ASL1600 Liquid Mass Flow Meter +1234 (dec) corresponds either to 58.76 l/min in flow mode or 12.34 C in temperature mode. Always use the `info' command to determine individual values of your sensor. (see Table 5)
2
Digital Interface and Power Supply
For communication and power supply the ASL1600 is equipped with a 4-pin M8 connector IEC 60947-5-2 (e.g. Hirschmann E Series M8). (Pigtail cables for this connector are available at Sensirion. Refer to article number 1-100136-01)
o 5,8 o 0,7 notches
1,95
RS-232 Interface
All configurations (see also Section 3) for the ASL1600 can be set using its RS-232 interface. The following pins are required to communicate with the ASL1600 via RS-232: RxD TxD GND (Receiving Data Line) (Transmitting Data Line) (Ground)
Pinout
2,15
2 1
3,4
2,8
2,2
4 3
0,5
Figure 3: Connector for RS232 and power supply with pinout view from outside Pin 1 2 3 4 Description VDD TxD (Sensor Transmitting Data) RxD (Sensor Receiving Data) GND (Ground)
The RS-232 protocol of the ASL1600 is configured as follows:
Baud Rate Data Bits Stop Bits Parity Protocol Echo 19200 8 1 none none the sensor generates an echo
GND and VDD (Power Supply) The ASL1600 requires a voltage supply of between 7V and 18 V. Since this voltage is internally regulated, there are no stringent requirements as far as ripple and stability are concerned.
With these settings, the ASL1600 device can be connected to any PC or device with an RS-232. The commands have to be sent in ASCII format, the measurement values are provided as a 16 bit integer in binary format with 2 bytes synchronization preceding.
sync 0x7F sync 0x7F high Byte low Byte
2.1 Digital Interface Dataformat
The ASL1600 has a bi-directional RS-232 interface to set configuration and to get flow or temperature values. The received value is a 16 bit integer in the two's complement representation.
received received value (hex) value (dec) 0x7EFF 32511 flow [ l/min] +1548.140 temperature [C] +320.00*
1. byte 2. byte 3. byte 4. byte Figure 4: Byte sequence of one value Because of the maximum range of 0x7EFF, the high byte will never contain 0x7F. So, the worst case is, if the lower byte contains 0x7F. In this special case, 0x7F appears three times in a row. Example (val=7C 7F): received string: 7F 7F 7C 7F 7F 7F 7C 7F right sync: 7F 7F 7C 7F 7F 7F 7C 7F wrong sync: 7F 7F 7F 7C The best approach to find the sync in pseudo code:
if (buffer[ i ]=7F and buffer[i+1]=7F and buffer[i+2] <> 7F) then buffer[i] and buffer[i+1] are sync bytes.
0x0001 0x0000 0xFFFF
1 0 -1
+0.0476 0.0000 -0.0476
0.01 0.00 -0.01
0x8101
-32511 -1548.140 -320.00* *not possible value, just to show the principle
Table 3: Interpretation of integer values The calibrated data is multiplied by a constant factor and then rounded to the next smaller integer in order to transfer also fractions of a unit through the integer protocol. Example: with factor=21 a received value of
www.sensirion.com
May 2007 V0.7
4/8
www..com
ASL1600 Liquid Mass Flow Meter
3
Configuration and Commands
The ASL1600 device accepts a set of commands through its RS-232 interface (see Table 5 for valid commands; for correct settings of the RS-232 refer to Section 2.1). This allows the user to configure the ASL1600 device. Since the configuration is stored in the internal EEPROM, it is maintained after power interruptions. With the exception of the stop s command, all commands have to be sent in the ASCII-format and terminated by the return key (, ASCII #10 or #13; never #10 and #13). After completion of a command, the ASL1600 returns ok and is ready to accept a new instruction. Before entering a command, it might be necessary to clear the buffer by means of using . There is a trade-off between resolution and measurement time. Possible settings are listed in Table 4. Choosing 12 bit results for example in a
measurement interval of 80 ms. With the max resolution of 15 bit, a new measurement is provided every 640 ms. Table 4: Resolution settings using the res=value command and corresponding response times Internal signal Data rate Resolution res= integration time [Hz] [bit] [ms] 200 0 8 5 100 1 9 10 50 2 10 20 25 3 11 40 12.5 4 12 80 6.25 5 13 160 3.125 6 14 320 1.56 7 15 640
Table 5: RS-232 interface commands Command Output Description help commands Lists all available commands ver version Provides type of sensor, firmware version and article number info calibration Unit / Factor Flow / Overflow / Sensitivity / Factor Temperature data serial ID Sensor serial number go Starts series of measurements s stop Stops series of measurements defspi=x SPI-Mode: P=push, G=get (defspi? = Status) get Start single measurement (lifetime limitation: 1 Mio cycles) mod=F | T mode Selects flow- (F) or temperature mode (T), (mod? = Status) res=0..7 resolution Sets resolution: 0 -> 8 bits; 7 -> 15 bits, see Table 4, (res? = Status) x=number of 5 ms intervals between automatic internal temperature measurements for int=x an update of the temperature compensation (duration: 45 ms). 0=never, {1..2*109}. (INT? = Status). Flow is NOT measured during this internal temperature update! Manual command for an internal temperature measurement for internal update of the updatetemp temperature compensation. Used with int=0 rdatax Reads 4 user defined bytes at the address x={0,...,9} wdatax=yyyy Writes a maximum of 4 user defined bytes at the address x={0,...,9} test Sensor selftest reset Resets ASL1600 device pw=expand Switch security mode off. Allows selecting raw data mode. raw= 1 | 0 Selects data mode: 1=raw data, 0 = linearized, temp. compensated data Notes: * Due to the limited write cycles allowed (lifetime limitation: 1 Mio cycles) for the EEPROM, excessive configuration modifications should be avoided. Even the get-command underlies this limitation. * The commands are not case sensitive.
www.sensirion.com
May 2007 V0.7
5/8
www..com
ASL1600 Liquid Mass Flow Meter * In order to send a new command to the ASL1600, make sure the ASL1600 is not in measurement mode. Issue therefore a stop command s first. After this, any instruction can be given to the ASL1600 and a new series of measurements can be started by go.
RS232 Communication Error Codes
ERROR 01 ERROR 02 ERROR 03 ERROR 04 ERROR 50 ERROR 99 Invalid command Wrong syntax Value out of range Not allowed mode Invalid EEPROM Internal error
4
Electrical and Mechanical Specifications ASL1600
10C to 50C 10C to 50C 5.0 bar
4.1 Absolute Maximum Ratings
Ambient storage temperature Ambient operating temperature Overpressure resistance
4.2 Electrical Specifications
Table 6: ASL1600 DC Characteristics. Parameter Conditions Power Supply DC DC, abs. maximum rating VDD = 9 V, no load Operating Current VDD = 9 V, 3k at RS232 output Power Dissipation VDD = 9 V, no load
Min. 7
Typ. 9 20 27 180
Max. 18
Units V mA mA mW
Table 7: ASL1600 RS-232 Characteristics. Parameter Conditions RS232 Output Transmitter output loaded Output Voltage Swing with 3k Power-Off Output Resistance Output Short Circuit Current RS-232 Input Voltage Range abs. maximum rating Voltage Threshold Low High Hysteresis Resistance
Min. 5 300
Typ. 9
Max.
Units V mA
18 -15 0.8 0.2 3 1.2 1.7 0.5 5 15
V V V V k
2.4 1.0 7
www.sensirion.com
May 2007 V0.7
6/8
www..com
ASL1600 Liquid Mass Flow Meter
4.3 Mechanical Specifications
Wetted Materials The medium only gets in contact with the straight sensor capillary made of Duran(R)- (borosolicate glass 3.3), with the PEEKTM-fittings and with Teflon(R) used as sealing material. Table 8: Mechanical Specifications Parameter Fluid Connectors Connected Fluid Capillary, Inner Diameter Connected Fluid Capillary, Outer Diameter Internal Sensor Capillary, Inner Diameter Total Mass
Conditions See Remark Below
ASL1600-10
ASL1600-20
Units mm mm Inch mm g
UNF 10-32 2B 0.5 0.8 1.6 1.6 1/16 1/16 1.0 2.0 36
Remark The inner diameter of the connected fluid capillary at the inlet of the ASL1600 must not be smaller than the specified value above. A smaller inner diameter may cause turbulences which influence the accuracy of the measurement. Make sure the capillary has been cut in the right way without squeezing.
!
5
Physical Dimensions
The ASL1600 housing is made of chemically inert PBT. For physical dimensions see Figure 5: Figure 5: ASL1600-10 ASL1600-20
Positive Flow Direction
6
Ordering Information
For OEM applications the sensor can be purchased in larger quantities without any additional parts. Product LabKit ASL1600-20 ASL1600-20 LabKit ASL1600-10 ASL1600-10 Article Number 1-100421-01 1-100423-01 1-100422-01 1-100420-01
For laboratory use and technology evaluation, the LabKit ASL1600 can be ordered. This laboratory-package contains - Liquid Flow Sensor ASL1600-10/20 - UNF10-32 Fitting Material - PC Software (Viewer & Data Export Tool) - Data Cable RS232 - A/C Adaptor (110...230 V, 50..60Hz)
www.sensirion.com
May 2007 V0.7
7/8
www..com
ASL1600 Liquid Mass Flow Meter
7
Important Notices
such defects shall be found, to SENSIRION's reasonable satisfaction, to have arisen from SENSIRION's faulty design, material, or workmanship; the defective product shall be returned to SENSIRION's factory at the Buyer's expense; and the warranty period for any repaired or replaced product shall be limited to the unexpired portion of the original period. This warranty does not apply to any equipment which has not been installed and used within the specifications recommended by SENSIRION for the intended and proper use of the equipment. EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH HEREIN, SENSIRION MAKES NO WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH RESPECT TO THE PRODUCT. ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED. SENSIRION is only liable for defects of this product arising under the conditions of operation provided for in the data sheet and proper use of the goods. SENSIRION explicitly disclaims all warranties, express or implied, for any period during which the goods are operated or stored not in accordance with the technical specifications. SENSIRION does not assume any liability arising out of any application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. All operating parameters, including without limitation recommended parameters, must be validated for each customer's applications by customer's technical experts. Recommended parameters can and do vary in different applications. SENSIRION reserves the right, without further notice, (i) to change the product specifications and/or the information in this document and (ii) to improve reliability, functions and design of this product. Copyright(c) 2007, Sensirion AG; All rights reserved. CMOSens(R) is a trademark of Sensirion AG, Switzerland. PEEKTM is a trademark of Victrex PLC Teflon(R) is a registered trademark of DuPont Corporation Duran(R) is a trademark of the SCHOTT-Group
7.1 Warning, personal injury
Do not use this product as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. Do not use this product for applications other than its intended and authorized use. Before installing, handling, using or servicing this product, please consult the data sheet and application notes. Failure to comply with these instructions could result in death or serious injury. If the Buyer shall purchase or use SENSIRION products for any unintended or unauthorized application, Buyer shall defend, indemnify and hold harmless SENSIRION and its officers, employees, subsidiaries, affiliates and distributors against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if SENSIRION shall be allegedly negligent with respect to the design or the manufacture of the product.
7.2 ESD Precautions
The inherent design of this component causes it to be sensitive to electrostatic discharge (ESD). To prevent ESD-induced damage and/or degradation, take customary and statutory ESD precautions when handling this product. See application note "ESD, Latchup and EMC" for more information.
7.3 Warranty
SENSIRION warrants solely to the original purchaser of this product for a period of 12 months (one year) from the date of delivery that this product shall be of the quality, material and workmanship defined in SENSIRION's published specifications of the product. Within such period, if proven to be defective, SENSIRION shall repair and/or replace this product, in SENSIRION's discretion, free of charge to the Buyer, provided that: notice in writing describing the defects shall be given to SENSIRION within fourteen (14) days after their appearance;
FCC and CE Statement
This product has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules (FCC CFR 47). These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of more of the following measures:
* * * *
Reorient or relocate the receiving antenna. Increase the separation between the equipment and the receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult a dealer or an experienced radio/TV technician for help.
The devices fully comply with norm EN 50081-2 (Emission Test Series) as well as EN 50082-2 (Immunity Test Series) .
Headquarters and Sales Office
SENSIRION AG Laubisrutistrasse 50 CH-8712 Stafa/Zurich Switzerland Phone: + 41 44 306 40 00 Fax: + 41 44 306 40 30 e-mail: info@sensirion.com http://www.sensirion.com/ SENSIRION Inc Westlake Pl. Ctr. I, suite 240 2801 Townsgate Road Westlake Village, CA 91361 USA Phone: 805-409 4900 Fax: 805-435 0467 e-mail: michael.karst@sensirion.com http://www.sensirion.com/
www.sensirion.com
May 2007 V0.7
8/8

▲Up To Search▲

Price & Availability of ASL1600

	To Download ASL1600 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .