AD monitoring March, 2007

1.1 Applying CCD(CMOS) Measuring Methods 1. Liquid Level Detection 1.1 Applying CCD(CMOS) Measuring Methods (1) Gethering the data from CCD, (2) Image processing, including binary image processing (3) Distinguish the liquid level

Experiment: put a small sized graduate into a larger sized one, both of them are filled with water (a) outer cup with high water level, inner cup with low water level

(b) outer cup with low water level, outer cup with low water level (c) outer cup and inner cup with same water level. (b) (c)

1 ． 1 ． 2 Questions: （ 1 ） Is the infrared adopted? Because Steel Tank is fully sealed, IR CCD is used, the price is around RMB2000 （ $260 ） Wondering if an extra auxiliary source of light IR LED is used… (2) If not IR LED, thermal imager instead of IR LED, price is high 0.02 Lux ， 3920 Serise ， RMB60K （ $7 ， 700 ） 5960 Serise, RMB120K （ $15K ） (3) How many IR CCD needed? Take 3920 Series for instance, Array Format: 320×240 ， measuring range: ： 320mm ； 6400mm ； 960mm ； measuring error ： 1 － 2 mm ； 2 － 24mm ； 3 － 6 mm ；

1.2 SITRANS LC 500 Capacitance （ RF admittance ） level transmitter （ Siemens ） Measuring method immersing in the liquid, the probe is connected with outer parts via cable Characteristics: (1)Temperature: -200~ 450°C, Pressure: FV to 525 bar (2) Patented Active-Shield technology, high performance (3) 16mm probe: up to 3.5m, 24mm probe up to 5.5m. Rod version: up tp 35m. Process connections: Threaded&Flange (4)2-wire current loop, 4-20/20-4 mA measuring signal, intelligent transducer(HART protocol), remote monitoring, (5)Accuracy:< 0.1% actual measurement. (6) Price: RMB13,500($1,700) (7) at least 3 sets. Needed

1.3 Contact type ultrasonic transducer Measure elements: Buffer oil, LS ( immerged type may be used), Ga-LS(outside of it?) Measuring methods

1.3.2 Features: ( 1)measure range: 3m 5m 10m 20m 30m(1) (2) measure error: 0.1% (3 ） current output ： 4 ～ 20mA ， RS-485 ，电源： DC24V （ 4 ） price ： around RMB20K （ $2 ， 600 ） (5) shell shelter ： IP65 (6) Probe being with 500v pulse high voltage 1.4 Non-contact type ultrasonic transducer 3 sets, installed at the top of liquid, gas N2 measure error: 0.1%-0.2% price ： around RMB15K （ $1,900 ） Probe being with 500v pulse high voltage

1.4 other methods(un-optional ) (1)Radar: SITRANS LR 300 （ Siemens ） (2) Optical Fiber; Via capillary the liquid pressure is conducted into optical tranducer system outside the container. High accuracy, high price,around RMB80K per detecting point, and each unit includes 16 points. (1) (3) plunging type pressure transducer Accuracy:0.1%F.S Price: RMB2,200($280) Used in open tank Transducer,outside Sensor,in liquid

Suggestions for liquid level measurement (1)If IR CCD is acceptable, then use it. And is IR auxiliary light source acceptable? If not, considering high price CCD. (2) Consider choosing capacitance type (3) Ultrasonic type

2.Temperature Measurement Place: top, side, bottom of the steel tank Buffer oil WWZPK Serise sheathered temp meter with platinum resistance sensor curacy: < C Price: RMB200 （ $25 ） If tIf thread is cable, need extra protection Questions: How much?

3. Cover gas 3.1 N2 GE-NovaSensor NPI Serise, diffusing type silicon pressure sensor (1) Pressure range : min kPa (2)316 a stainless steel diaphragm, caustic media compatible (3)0.1%F.S (4)Price: RMB120 （ $15 ） sensor only. When required accuracy is more, it also may be supplied. Questions: Pressure range? Accuracy range?

3.2 Residue O2 measurement (1)German MESA oxygen sensor, electrochemistry sensor, 1600RMB （ sensor ）， 9000RMB （ all ） Normal lifetime>2yrs (2)GNL-L3 Oxygen transmitter, probe from German, ZrO2 Measuring range: 0.01%--21%02, optional: 0.01ppm--1000ppm02 、 0.01% %02 Measure error: ≤±0.02% Price:RMB16K Above C from Heated probe, no much effect for the surroundings. A fist size with outer layer. Normal lifetime>3yrs Hollywell High-accuracy oxygen sensors employ dynamic ZrO 2 discs which is considered reliable and cabinet. A heat element produces the 700 °C required for the ZrO 2 to operate as an O 2 pump. (3) Hollywell Oxygen Sensor Series.

Questions : (1)Necessary to use it? (2) The lifetime is limited. (3) Heating is needed when using ZrO2.