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Фрагмент инструкции
B. Principle of Operation Fluid flows through the meter, first passing through a helical nozzle, which causes flow to spiral, rotating in a helical pattern. The spiraling fluid then impacts on the flat blade rotor causing the rotor to spin. The rotor is designed to immediately develop a rotation-induced friction free fluid bearing, thus eliminating any potential bearing wear. An infrared electro-optical transmitter and receiver is molded into the body of the meter along with a pair of miniature circuit boards, providing voltage stabilizers.* This design inherently bleeds off entrained gas, improving the accuracy of the meter. * Clear, transparent & translucent fluids; must transmit infrared light. FTB600B Series Installation 1 C. Material Characteristics of PVDF (Polyvinylidene Fluoride) 1. Material of construction Trade name - Kynar All wetted parts of the FTB600B Series are PVDF, excluding the O-ring. Wetted parts include any part of the meter that will or could come in contact with the fluid. List of wetted parts: 1. Barbed fittings 5. End caps 2. Flow meter body 6. Strainer 3. Rotor 7. Bearings 4. Helical nozzle (Viton O-ring seal) 2. Chemical Composition Polyvinylidene Fluoride is a fluorpolymer consisting of three basic materials (carbon, hydrogen and fluorine) 3. Effects of Various Fluids a . Weak acids - no effects b. Strong acids - attacked by fuming sulfuric & nitric acids at high temperature. c. Weak alkalis - no effects d. Strong alkalis - no effects e. Organic solvents - Resistant to most. Slight attack by some. Imbrittled by some amines, keystone and esters. FTB600B Series Operating Parameters 2 Section 2. - Operating Parameters A. Temperature Since the FTB600B Series has printed circuit boards molded into the body of the meter it is strongly recommended that 180°F not be exceeded. Exceeding 180°F can cause irreparable damage to the circuit boards. B. Flow Ranges The FTB600B Series is available in six different sizes, which cover a flow range from 0.1 to 120 lpm. Specific flow ranges FTB601B 0.1 to 2 lpm (0.03 to 0.53 gpm) FTB602B 0.3 to 9 lpm (0.08 to 2.38 gpm) FTB603B 0.5 to 15 lpm (0.13 to 3.96 gpm) FTB604B 1.0 to 30 lpm (0.26 to 7.93 gpm) FTB605B 2.5 to 75 lpm (0.66 to 19.8 gpm) FTB606B 4.0 to 120 lpm (1.32 to 32 gpm) WARNING Over range may permanently damage the flow meter. FTB600B Series Operation Parameters 2 FTB600B Series Operating Parameters 2 C. Recommended Viscosity Range 1-5 cSt (w/o correction) The effects of changing viscosity on the FTB600B Series are the same as any other turbine flow meter. It is important to remember that a turbine meter is a viscosity dependent device, where as the viscosity increases the linearity of the flow meter will decrease. (Water like viscosities are ideally suited for use with the FTB600B Series) The FTB600B Series is factory calibrated with water. Correction procedure for higher viscosity For viscosities greater than 5 cSt consult the factory. The FTB600B Series can be used on fluids greater than 5 cSt. however, the K-factor (linearity) will change. This requires a recalibration of the FTB600B Series at the known viscosity to determine the new KFactor. D. Filter Recommendations Meter Micron Mesh FTB601B 35 400 FTB602B 50 300 FTB603B 100 80 FTB604B 100 80 FTB605B 100 80 FTB606B 100 80 FTB600B Series Silicone Treatment 3 Section 3 - Silicone Treatment Silicone treatment is standard for all types of the FTB600B Series series electronics. FTB600B Series Infrared Sensors 4 Section 4 - Infrared Sensor A. Supply Voltage 24 Vdc. Do not exceed 24 Vdc. Doing so can cause overheating and eventual failure of all PC boards. Printed circuit boards are non- repairable. B. Frequency Output 1. Square wave pulse, unscaled (See Figure 4-1) 2. Output impedance 75 ohms 3. Directly proportional to flow rate 4. Output - dc frequency 5. Offset 0.64 volts 6. Peak voltage = Supply voltage - 1.2 volts 7. Peak to peak voltage Supply voltage - 1.2 volts - 0.64 volts 8. Output signal cycle 66.7% (i.e. at 100 Hz there is a 6 millisecond “on” time and a 4 millisecond “off” time) 9. TTL/CMOS circuit compatibility. The FTB600B Series has an operational amplifier output, which has a high input impedance and a low output impedance. FTB600B Series Infrared Sensors 4 C. Frequency Ranges for (non-cartridge models) pulses/l Model Frequency (Hz) K-Factor FTB601B 60 to 1200 36,000 FTB602B 40 to 1200 8,000 FTB603B 27 to 800 3,200 FTB604B 20 to 600 1,200 FTB605B 18.75 to 562 450 FTB606B 15 to 450 225 D. Cable Requirements 1. 20 to 22 AWG (American Wire Gauge) 2. 4 conductor-shielded cable. NOTE Avoid influences of strong electromagnetic forces as they can damage components on the PC boards. FTB600B Series Infrared Sensors 4 Figure 4-1. Output Frequency Waveforms FTB600B Series Installation 5 Section 5 - Installing the FTB600B Series in the fluid line. A. Make sure the fluid is compatible with PVDF (polyvinylidene fluoride) and meets viscosity, pressure and temperature parameters of the FTB6...