Glass tube Rotameter Flow Meter

Specifications : 

G/R/F10, 20, 30 glass tube flow meter has three types of connection,they are threaded type(G10, 20, 30 types),hose type(R10, 20,30 types),flange type(F10,20,30 types).It’s divided into conventional type (Measuring general noncorrosive fluid) and corrosion resistant type(Measuring corrosive fluid.).The meter is featured with compactness,light structure, nice figure,convenient maintenance,safe and reliability, easy installation.The flange of F10, 20, 30 types can rotate to be aligned with the pipe holes on site. G/R/F10, 20, 30 glass tube flowmeter can substitute the glass tube flowmeter installed on the complete production lines imported, are widely used in chemical industry,light industry, pharmacy, food industry, papermaking,environment protection,measuring, testing and scientific research institutes etc. to measure the flow rate of single phase non pulse fluid(liquid or gas).

Main technical datasheet :

DN (mm)	Normal type	Anti-corrosion type	Flow range		Pressure loss(Pa)	Allowed measuring fluid condition		Accuracy degree
			Water (20℃)L/h	Air (20℃/101325Pa)m3/h		Pressure(MPa)	Temp.(℃)
15	G10/20/30-15 R10/20/30-15 F10/20/30-15	G10/20/30-15F R10/20/30-15F F10/20/30-15F	10~100 16~160 25~250 40~400 63~630	0.3~3 0.5~5 0.8~8	1000 1100 1200 1700 2000 2500 3000	≤1.0	-20~+120	2.5
25	G10/20/30-25 R10/20/30-25 F10/20/30-25	G10/20/30-25F R10/20/30-25F F10/20/30-25F	63~630 100~1000 160~1600 250~2500	2~20 3~30	2800 4000 5000 6000
40	G10/20/30-40 R10/20/30-40 F10/20/30-40	G10/20/30-40F R10/20/30-40F F10/20/30-40F	160~1600 250~2500 400~4000	5~50 8~80	3400 4000 5000	≤0.9
50	G10/20/30-50 R10/20/30-50 F10/20/30-50	G10/20/30-50F R10/20/30-50F F10/20/30-50F	400~4000 630~6300 1000~10000	12~120 20~200	4800 6500 8500	≤0.7

Installation Guidance : 

1. Before installation, please check float measuring sharp edge (reading edge) is damaged or not. During transportation, stuffing which prevents float from run-out should be taken out of flowmeter with guide rod. To check the float can slide freely or not in the guide rod.

2. The flowmeter should be installed in vertical position. (Angle of flowmeter’s center line and plumb line should not exceed 5°). And it has reliable supporting, and should not bear any tension and preesure from pipe. The new installed pipe should be washed clear, after that, flowmeter can be installed. The measured fluid’s inlet is at the lower end and the outlet is at the upper end. Note: No flowmeter can be used in hand!

3. The lower end (inlet) should has five or ten times of bore of straight length. We recommend to install the flowmeter according to Fig.2. It is strongly recommended to install bypass pipe next to the flowmeter.

4.The measured fluid can not be mixed with a large dirt particles, otherwise float would be stuck or flow path would be blocked. Install filter in the upstream of flowmeter as required.

5.The measured fluid’s pressure must be stable, unstable fluid’s pressure will cause float fluctuation and inaccurate measurement. Buffer or valuator should be set in the upstream of flowmeter.

6.Backflow consists in pipeline, especially water hammering, in order to prevent flowmeter from damage, install one way stop return valve after downstream valve.

7.If the measured liquid contains bubbles, exhaust port should be set in the upstream of flowmeter

Operating : 

1.Open flowmeter’s upstream valve slowly in order to prevent float from a sudden impulse to damage glass, then regulate flow rate with downstream flow control valve. When stopping working, turn off upstream valve firstly, then turn off downstream valve. Proposed to wrap up one wire mesh outside the flowmeter in oder to enhance security.

2.Avoid abrupt changes in the measured fluid temperature.

3.If flowmeter leakage is found in use, generally sealing rings are invalid, that should be replaced.

4.When taper tube and float are contaminated, they should be cleaned.

5.Periodically check flowmeter’s errors, once beyond prescribed error, float and taper tube should be replaced or recalibrated.

6.When measured fluid & state (temperature, pressure) are different with scale & state in the flowmeter, indication should be corrected according to measured fluid and state (including density, temperature, pressure, etc.) to get the right flow rate.

7.Measuring corrosive fluid should choose anti-corrosive series flowmeter.