Metal Tube Rotameter

The HQLZ-250 metal tube float flowmeter adopts a variable area measurement principle and is suitable for measuring liquids and gases. It has a full-metal structure and comes in various types such as indicator type, electric remote transmission type, corrosion-resistant type, high-pressure type, jacketed type, explosion-proof type. It offers standard analog output signals of 0-10mA and 4-20mA, as well as on-site indication. It can be used for cumulative measurement, digital communication, on-site modification of measurement parameters, different power supply methods, with magnetic filters and special specifications. It is widely applied in industries such as petroleum, chemical engineering, power generation, pharmaceuticals, food, and water treatment, in complex, harsh environmental conditions, and various medium conditions during flow measurement processes. 
2. The metal tube float flowmeter is a commonly used variable-area flow measurement instrument in industrial automation process control. It features a small size, a wide detection range, and ease of use. It can be used to measure the flow of liquids, gases, and steam, and is particularly suitable for measuring the flow of low-velocity and low-flow media. 
The characteristics of the measurement part of the HQLZ-250 metal tube float flowmeter 
1. A sturdy all-metal structure design type float flowmeter
2. A measurement tube indicator with an independent concept design
3. Optional measurement systems made of stainless steel, Hastelloy alloy, titanium, or PTFE material 
4. Low-pressure loss design
5. Short stroke, small structure design, total instrument height 250
6. Magnetic coupling structure ensures more stable data transmission and signals
7. Insulation or heating jacket
8. Vertical, horizontal, various installation methods are more suitable for different usage scenarios
9. Suitable for measurement of small-diameter and low-flow rate medium flow
10. Reliable operation, low maintenance, long lifespan
11. No strict requirements for straight pipe sections
12. Wide flow ratio of 10:1
13. Dual-line large LCD display, optional on-site instantaneous/cumulative flow display, with backlight
14. Single-axis sensitive indication 
15. Non-contact magnetic coupling transmission
16. All-metal structure, suitable for high temperature, high pressure and highly corrosive media
17. Can be used in flammable and explosive hazardous environments
18. Available in two-wire, battery, and AC power supply options
19. Multi-parameter calibration function
20. Equipped with data recovery, data backup and power failure protection functions

HQLZ-250 Metal Tube Float Flowmeter Main Technical Parameters
◇ Measuring Range: Water (20℃) 1 - 200,000 liters/hour
Air (20℃, 0.1013 MPa) 0.03 - 4,000 m³/hour; Refer to the flow chart, special flow rates can be customized
◇ Scale Ratio: Standard Type 10:1
◇ Accuracy: Standard Type 1.0 grade; Special Type 0.5 grade
◇ Pressure Rating: Standard Type: DN15 - DN50 4.0 MPa; DN80 - DN200 1.6 MPa
Special Type: DN15 - DN50 25 MPa; DN80 - DN200 16 MPa
The pressure rating of the jacket is 1.6 MPa; Special Type should be negotiated with the factory before selection and ordering
◇ Pressure Loss: 7 kPa - 70 kPa
◇ Medium Temperature: Standard Type: -80℃ - +200℃; PTFE: 0℃ - 85℃
High Temperature Type: *High up to 300℃
◇ Medium Viscosity: DN15: η < 5 mPa.s (F15.1 - F15.3) / η < 30 mPa.s (F15.4 - F15.8)
DN25: η < 250 mPa.s
DN50 - DN150: η < 300 mPa.s
◇ Environmental Temperature: Pointer Type -40℃ - +120℃
◇ Connection Type: Standard Type: DIN2501 standard flange
Special Type: Any standard flange or thread specified by the user
◇ Cable Interface: M20*1.5
◇ Power Supply: Standard Type: 24VDC two-wire system 4 - 20mA (10.8VDC - 36VDC)
◇ Alarm Output: Instantaneous flow upper or lower limit alarm, open collector output (maximum 100mA @ 30VDC internal resistance 100 ohms)
Relay Output (Contact Capacity 1A @ 30VDC or 0.25A @ 250VAC or 0.5A @ 125VAC)
◇ Pulse Output: Cumulative pulse output, minimum interval 50 milliseconds
◇ LCD Display: Instantaneous Flow Display Value Range: 0 - 50,000
Cumulative Flow Display Value Range: 0 - 9,999,9999 (can have decimal point)
◇ Protection Grade: IP65
◇ Explosion-proof Mark: Flameproof Type ia II CT5; Intrinsically Safe Type d II BT6

Schematic diagram of metal tube float flowmeter

Installation structure diagram