I. Product Overview: Cenci LZ500 series metal tube (also known as metal rotameter, metal tube rotameter or metal rotameter), all-metal construction, Modular design concept, the pressure loss is small, turndown ratio large (10: 1), easy installation and maintenance, can be used for complex, harsh environment conditions and a variety of media flow measurement and process control, suitable for measuring liquids, gases. According to the instructions, and the signal output in the form applicable classification: pointer type, electric remote type, corrosion-resistant type, high-pressure type, dips, explosion-proof. Dual-line large LCD, the scene shows the cumulative, instantaneous flow, support for digital communications, field-modified measurement parameters, electric remote output 0 ~ 10mA, 4 ~ 20mA standard analog signal, especially for small caliber and low velocity media flow measurement; reliable, low maintenance, long life; widely used: petroleum, chemical, power, pharmaceutical, food, water and so on. Complex, harsh environmental conditions, and flow measurement conditions during various media. Second, the principle: Cenci metal tube, is a variable area flowmeter. In a vertically upward by the expansion cone tube, the float is free to rise and fall, the float of circular cross-section is powered by a liquid subjected to gravity in the cone, with the change of flow rate, flow rate and buoyancy in the float By moving up and down, in a certain position of the float and float the force of gravity to achieve the balance. At this point the flow annulus area of ??the float and orifice (or taper pipe) between the annulus area to maintain a certain height is proportional to the rise of the float, which increases the size of the float in the measuring tube position represents the flow, changes in position of the float by the internal transmitted through the magnetic coupling to an external indicator, the indicator accurately indicates the flow rate value at this time. This makes the indicator housing is not in direct contact with the measuring tube and, therefore, even if the limit switches or transmitters, the instrument can be used under high temperature, high pressure working conditions. Third, the product advantages: 1, rugged all-metal design type rotameter 2, using an independent mnodular conceptual design of the measuring tube indicator 3, available in stainless steel, Hastelloy, Titanium, PTFE material measuring system 4, based on the module design design, remote output, switching signal output 5, short stroke, compact design, the total height of 6 meter, suitable for measuring low flow, low flow medium 7, magnetic coupling structure ensures data transmission, the signal is more stable 8, vertical horizontal, installation is more suitable for a variety of different occasions 9, available with HART protocol, all the user needs immediate installation and use 10, high temperature, high pressure design, anti-corrosion material selection suitable for all complex media environment Fourth, technical parameter measurement Range: water (20 ℃) ??1-200000 l / h of air (20 ℃, 0.1013MPa) 0.03-4000m3 / h See flow meter, flow can be ordered special turndown ratio: Standard 10: a special type 20: 1 Accuracy: Standard 1.5 1.0 special type pressure levels: Standard: DN15-DN50 4.0MPa DN80-DN200 1.6MPa special type: DN15-DN50 25MPa DN80-DN200 16MPa pressure rating for a jacket. 6MPa special type of pre-selection and ordering in pressure loss should consult with the factory: 7kPa-70kPa medium temperature: Standard: -80 ℃ - + 200 ℃: PTFE: 0 ℃ -85 ℃ high temperature: up to 400 ℃ medium viscosity: DN15: <5mPa.LZ (F15.1-F15.3) DN20 <30mPa.LZ (F15.4-F15.8) DN25: <250mPFa.LZ DN50-DN150: <300mPa.LZ Ambient temperature: -30 LCD type ℃ - + 85 ℃; pointer type -40 ℃ - + 120 ℃ Connection: Standard: DIN2501 standard flange; special type: specified by the user to any standard flanged or threaded cable interface: M20 * 1.5 Power supply: standard 24VDC wire 4-20mA (10.8VDC-36VDC); AC type: 85-265VAC 50HZ; Battery Type: 3.6V@4AH NiMH battery alarm output: upper or lower instantaneous flow alarm Standard: Open Collector output (100mA @ 30VDC maximum internal impedance of 100 ohms) Special type: relay output (maximum contact capacity 5A @ 250VAC) Pulse output: Cumulative pulse output, the minimum interval of 50 ms LCD: display instantaneous flow value range: 0-50000 cumulative flow Display Value range: 0 to 99999999 Protection class: IP65; proof mark: intrinsically safe ExiaIICT4-T6 flameproof dⅡCT6