Specifications and Product Details:

Introduction of Oval Gear Flometer:

Basic Technical Information:

1.Accuracy class class 0.5,class 0.2
(normal operating temperature -10+60)
2. Measured media temp. (environment
temperature -41+50)
LC-ABC: -20+60; 60200(with high temp. radiator installed) LC-QL: -20+60;
3. Explosion-proof mark: ExiaCT5, dBT4
4.Flowmeter of large viscosity
Type: LC-NRLC-NA for cast iron, LC-NE for cast steel
Nominal pressure (MPa):1.6 for cast iron; 6.3 for cast steel
under DN100;2.5 for cast steel above DN100
Measured liquid viscosity(mPa.s):2003000
Measured liquid temp.: -20+200
Accuracy class: 0.5

Installation and Operation

1. A strainer should be installed in front of the meter, and be sure that the arrows on the casting of the meter and the strainer pointing the same direction of the liquid flow.

2. If the metered media contains gas, a gas separator should be installed in front of the meter.

3.Whether the pipe line is vertically or horizontally installed, the wheels shaft of the meter must be fixed horizontal, that is, the dial is vertical to the surface.

4.While the meter is installed properly, the counter may be turned 180°or 90°for easy reading.

5.Prior to the installation of the new meter, first push the oval wheels from the outlet for several times with a bamboo rod, if the wheels dont move, they can be immersed in the petrol to prevent from deposits in the meter after the factorys inspection.

6. A throttle valve must be fixed at the inlet of the meter, an on-off valve at the outlet, which must be slowly activated to prevent from a sudden impact, reverse flow, and water hammer.

7. t is forbidden to clean the meter with steam.

8. For the continuous operated departments, a by-pass should be mounted.

9. Prior to the installation of the meter, the pipe line must be thoroughly cleaned, and at the time of cleaning use a straight pipeline in stead of the meter, to prevent impuritywelding residue from entering the meter.

10. It is forbidden to inspect the meter made of cast iron and cast steel using water.

11. During the operated of the meter the flow rate cant exceed the flow marked on the mamelon plate. It is preferable to operate the meter at 5080% of the max flow.

12. If the metered media is causticity, stainless steel shall be selected.

13. Following is the installation figure.

Error Calculation and Adjustment

1. Flowmeters basic error is calculated by every measuring value of each tested flow dot, as formulas followed: (Cubage method)

E=(VmV)/ V×100%

E: flowmeter error (generally total error), two effective numbers.

Vm: flowmeters measuring value (displaying value).

V: after adjusted, flowmeter standard set measuring value (actual value).

It is known by basic error calculation that when Vm is larger than V, meter basic error is + value ,which means that meter is fast, when Vm is smaller than V , meter basic error is value ,which means that meter is slow.

Flowmeter error may need to be adjusted and stay in basic error by replacing a standard gear set of the counter. That is to change mechanic transmitting ratio, which can make displaying value adjusted. Adjusting error cant change flowmeters flow characters, but it can make the error curve stay in the new coordinates system.

Generally, in actual flow range, basic error of Max. and Min. tested dots is not able to surpass definitive basic error. Flowmeter used generally is tested by adjusting intrinsic gear wheel set and then adjust error again according to idiographic condition.

2. Error adjustment steps

a. When designed, the standard gear set is 38/35. If the tested meter is found to be running faster, and causes a plus(+) error, for instance, if the error is +1.02~+0.3,replace the gear set by set 41/38(see table 1), so the error curve stays in the new coordinate system, then the error is adjusted within the error range of +0.39~-0.33.

b. During the operation of the flowmeter, the error range will be changed or over-ranged due to the wearing of the gear set etc. If the error range doesnt exceed 1%, it can be adjusted within the error range, for instance, the meter error drops to -0.7+0.2, when the gear set is needed to be replaced, first check the tooth number of it, if it is 41/38, error +0.63 corresponding to it will be regarded as zero pointer (coordinate origin), then the set 41/38 will be replaced by the set 40/37. The coordinate origin of the curve shifts from zero pointer for the set 41/38 down to the +0.43 pointer for the set 40/37, so the error curve stays in the new coordinate system,

Others

1. The stainless steel flow meters are specially made for the chemical liquid measurement 98% sulphidic acid, 60% nitric acid, 50% caustic acid.

2. NINGBO JIANGDONG SCIENTIFIC INSTRUMENTS FACTORY also produces Series OI, OM, OK Oval meters with the technology transferred from Bopp & Renther GmbH, Germany.

3. Prior to the delivery of the meter, it has been calibrated with the light diesel oil in the factory, and water calibration is not allowable in order to prevent the oval wheels from rusting. For the detail, see the national inspecting procedures standard JJG 235-99 Verification Regulation of Oval Wheel Flow meters.

4. The strainer is separate product with separate price (complete sets are also provided).

Notice for Order

1. Name, type, specification, material;

2. Media temperature, operating pressure, flow range;

3. Media Viscosity or the name of the media;

4. Special requirements (for instance explosion-proof mark, etc);

5. Name of work units of ordering and receiving products;

6. detailed address, telephone number and post code;

7. Work unit for settling accounts, bank and the account code;

8. The arriving station and the linkman;

9. Means for transportation;

10. Please contact us if you need more details about the related products;