Glass Rotameter is a kind of instantaneous flow measuring instrument which is easy to use, easy to read and widely used. It is extremely important to select and use this instrument. Regarding how the flowmeter sees the float reading, the following is an easy-to-use method for your reference:
The eyes are flush. Read the scale on the upper plane of the rotor. Start from the 0-scale direction. The data read on the rotameter is instantaneous flow. It is either volume flow or mass flow. If it is mass flow, you first convert it to The volumetric flow rate can then be estimated by dividing the volumetric flow rate by the cross-sectional area based on the bore diameter of the rotameter.
The selection of glass rotor flow meter can be considered from the following aspects:
1. The object of measurement. That is, measuring the type of medium, pressure, chemical properties. Such as liquid medium, gas medium, corrosive media should be selected anti-corrosion flowmeter.
2. According to the price of choice. In general, the high accuracy and high price. According to the purpose of measurement, the instrument accuracy grade should be selected. For example, only the measurement medium throughput must be controlled. After trial operation adjustment, the throughput must be stabilized at a later time, then the accuracy is secondary.
3. The performance of the flowmeter itself, after the above conditions are determined, generally speaking, if the price does not change significantly, the needle valve may be preferentially placed on the upper part of the flowmeter; if there is a large flow hole, it is a direct flow rate scale; the structure is simple; Smaller outside size and so on. If it is a small flow range, ball floater type can be used, because it is stable when measured, it is not easy to accumulate dust, has high precision and good interchangeability.
With the development of the instrumentation industry, the breakthrough in the technology of the instrumentation industry is inseparable from the support and efforts of the instrument manufacturers. Changzhou Chengfeng Flow Meter Company As a flow meter manufacturer, we strive to learn from others' new technologies, introduce advanced equipment, develop more technologies, and meet more customer needs. Chengfeng Flowmeter has also gradually sold its products abroad, and is widely favored by customers.
Gamma lab Nitrogen Generator is suitable for lab use, it makes use of pressure swing adsorption technology, separating and collecting nitrogen from air. It is easy to operate, plug and play, one simple push on starting button, nitrogen generator begin to work.
Laboratory Nitrogen Generator is one kind of Cabinet Nitrogen Generator. Its size is within 850 x 920 x 1100 mm, weight within 155 kg. Its details are as below:
2 Detailed technical specification
2.1 Compressed air consumption
The generator consumes a maximum of 115 slpm of compressed air to generate the required N2 flow. Air source is not included in this product.
2.2. Air supply pressure
Minimum air supply pressure shall be externally regulated to 600 kPa.
2.3. Air quality
This Generator is provided with one full set of FESTO filters, the air supplied to the Generator still need to be dry and oil-free.
2.4. N2 output
2.4.1. Quantity of N2 generate: the generator is capable of deliver 25 slpm nitrogen.
2.4.2. Delivery pressure: the generator delivers N2 at a pressure greater than 450 kPa.
2.4.3. O2 contamination level: O2 level in the N2 stream is not exceed 0.5%, and does not vary from peak to trough by more than 5% of the absolute concentration.
2.5 Dimensions
With package, the Generator size: 850 mm (Length)x 920 mm (width)x 1100 mm(height).
2.6 Weight
With package, the Generator weight is not more than 155 kg.
2.7 Wheels
The Generator is fitted with 2 fixed wheels at the rear and 2 swivel wheels with brakes at the front
2.8 Connection to power supply
The Generator has a panel mounted connector on the rear panel
• Current capacity at maximum temperature 2.5A<Imax<3.5A ( the power supply is capable of supplying 2.5A nominal)
• Jack plug, 5.5 x 2.5 x 9.5 mm, positive on the centre pin
• Maximum operating voltage at maximum temperature 30VDC.
• Minimum number of insertions/extractions while maintaining contact resistance specification AND without mechanical failure: > 5000
• Maximum contact resistance after specified minimum insertions: 30milliohms maximum
• Insulation resistance: min 100MegaOhms after environmental and durability tests
• Dielectric withstand Voltage : Min 500V for 60s
• Operating temperature range: -20 deg C to +70 deg C
2.9 Indicator
The Generator has a pushbutton illuminated switch on the front panel
• Button to be flush mounting or recessed into a bezel to avoid damage
• High corrosion resistance, either plastic or stainless steel body
• No symbol on button
• Size of button and bezel to be ~ 22mm to 30mm
• Mechanical Endurance : > 1000000 activations without mechanical failure
• Electrical Endurance : > 100000 cycles at maximum current and maintaining maximum specified contact resistance• Action mechanism : push on – push off
• Current handling capability : 4A DC min break, 4A DC min Make, inductive load (double the maximum expected current demand to give good lifetime)
• Maximum DC Working voltage : at least 40V DC
• Illumination type and color : LED, green
• Illumination Operating voltage: 24VDC
• Operating Temperature Range: -20deg C to +70 degC
• Terminal type : either screw terminal or 6.5mm spade type terminals
2.10. Solenoids
The solenoids on the gas control valves is 24 VDC.
2.11. Operation
2.11.1. Operating cycle
A typical operating cycle for the Generator is 1 start per day and then run for 8 hours per day, which is equivalent to 2000 hours of operation per year. Depending upon the particular site, operating time could be anywhere between 0 and 24 hours per day.
2.11.2. Operation at shutdown
When the power is turned off, the pressure vessels is maintained in the pressurized state by closing the two exhaust valves.
2.12. Start up
2.12.1. Start up time
Start up times means the time from start up to producing qualified nitrogen.
The time to complete start up is less than 15 minutes.
2.13. Gas connections
The two external gas connections on the Generator, Air In and N2 Out, are constructed from brass and are to suit ¼" (6.35 mm) OD tubing. There are labeling in English next to these connections, [Air In" and [N2 Out", as part of the rating label.
2.14. Environmental requirements
2.14.1. Operating temperatures
The Generator is normally operated within performance specification over the temperature range:
10ºC - 35ºC from 0 – 3000 m, and 10ºC - 25ºC from 3000 – 4500 m
The Generator can operate safely over the temperature range:
5ºC - 35ºC from 0 – 3000 m, and 5ºC - 25ºC from 3000 – 4500 m
2.14.2. Noise level requirements
Noise level from the Generator is less than 72dBa at 1m distance. This is achieved by fitting silencers on the exhaust vents.
2.15. Life Requirements
The Generator can operate with a mean time between failure of 5 years minimum.
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Shandong Gamma Gas Engineering Co. Ltd. , https://www.gammagas.com