FLLQ Gas ROOTS FLOW METER

       
 

2 Application
Measurable gas: natural gas, city gas, propane, nitrogen, industrial inert gases and so on.
Sphere of application: settle up a bill of the gas usage of restaurants, hotels; metering the gas of transmission and distribution network, industrial and civil boiler , also used as standard flow meter.

 
       
 
       
 

2 Features:(Functions and applications)
FLLQ gas roots flow meter is a volumetric one which can measure how much air through put in the sealed duct. The volume of gas is showed by monitor directly.
Specified as follows:
a) Small width range; small flow tumor-initiating.
b) No need of straight pipe; small space usage
c) Low power dissipation: one 2# 3.6V DC Lithium battery can continue to use more than two years.
d) Multiple functional; full and accurate parameter
e) Used with IC card payment system
f) Connected with users by remote set copy system to collect and manage data.
g) Setting password; power-off protective function


2 The usage of environment conditions:
Environmental temperature: -30鈩冿綖+55鈩
Relative humidity: 5%锝95%
Atmospheric pressure: 86kPa锝106kPa
Working conditions:
Medium temperature: -25鈩冿綖+55鈩
Nominal pressure: 1.6MPa
Power source: conventional type a. internal power supply: 3.6VDC Lithium battery, average current锛80渭A
b. external power supply: 24VDC (two-wire system), electric current:4锝20mA
c. external power supply: 24VDC (three-wire system), electric current:<100mA
Intelligent type a. internal power supply: 3.6VDC Lithium battery, average current锛200渭A
b. external power supply: 24VDC (two-wire system), electric current:4锝20mA
c. external power supply: 24VDC (three-wire system), electric current:<100mA


2 The form and attended mode of products:
Component elements: It is made up of sensor, converter or mechanical head of form.
Functional form:
a. Intelligent type: regarded microprocessor, flow sensor, temperature and pressure sensor as one part. To survey the flow, temperature and pressure of gas, compensate flow automatically, revise compressibility factor. Reflecting the integrated flux and the temperature and pressure of gas.
b. Conventional type: showing the integrated flux and instantaneous delivery.
Attended mode: connected with process pipe by flange; the standard of flange GB/T9113.1-2000
Shape and dimension: as the form 1


2 Working Principle:
FLLQ gas roots flow meter is a volumetric meter. The differential pressure, which is produced by the working of entrance and exit when the gas through the flow meter, will be link to super accuracy gear to drive the roots wheel rotating. During this period, it forms a confined space between the inside shell and cover plate. This space can charge and exhaust. The revolution of roots is proportional to the passing gas volume of flow meter. The rotation of roots transferred to flow integrating instrument by pulse signal to deal with, meanwhile to show the gross of gas.


2 Technical performance:
Operative norm:
GB 3836.1-2000 in accordance with detonating gas consumption of the first part: general requirements
GB 3836.2-2000 in accordance with detonating gas consumption of the second part: Flame-proof type 鈥渄鈥
GB 3836.2-2000 in accordance with detonating gas consumption of the forth part: Intrinsic safety 鈥渋鈥
JB/T7385-94 gas roots flow meter; Q/FM05-2005 FLLQ gas roots flow meter
Technical parameters and performance index: see the parameters in form 2

2 Electrical performance index
a) Frequency signal: frequency range 0.2Hz锝700Hz
Extent: low level<0.5V, high level VD-1V (VD is the power supply voltage)
b) Analog output: a set of two-wire system 4锝20mA , two sets of three-wire system 4锝20mA
Current output can match along with among pressure, temperature, operating mode flow or standard flow.
c) communication interface: RS485 interface signal
Enclosure protection grade: IP65
Explosive-proof grade:
Intrinsic safety: Exia鈥朇T4锝濼6; Flame-proof type: Exd鈥朆T4

Installation
Installation requirements: According to the rules, some safety requirements that users must obey to design, install, supply power or operate the flow meter to ensure the safety. Before installation, the flow meter, especially the new pipeline or repaired one, needs to be pipeline purging to eliminate welding slag and rust and so on.
a) The intensified external magnetic filed disturbance and strong mechanical vibration should not be existed around flow meter. Before installation, we should use it according to the usage of environment conditions.
b) Installing the flow meter correctly; the hoisting equipments鈥 load and protection should be fit to rule. To hoist meter by rope is not allowed.
c) Ways of installation
Vertical installation: The gas entrance is above, that is, the airflow is entering from above and exit from bottom. Our factory suggests that use this way to help it improve the ability of self-cleaning.
Horizontal installation: the entrance and exit rope should not below pipelines鈥 axis to defend the impurity. And we can connect flow meter flange and filter flange.
d) It is necessary to install a regular filter on the upstream flow meter. When it owns a straight pipe and elbow at very beginning, it needs to be connected with filter mantle. It has been found that to install a regular filter is an effective way to reduce error and prolong life. And in order to maintain, the filter is accompanied by differential manometer.
e) Being given it coverings is to protect one from weathering if we install it outside. Leave enough space to check and repair.
f) Installing a bypass pipeline is to ensure the normal deliver. To close the bypass pipeline is a must under the normal condition.
g) The flow meter should install with pipe coaxial to avoid the gasket seal and butter entering the lumen.
h) The flow meter has to meet the ground reliably when installed in the explosion place. However, it can not use the same grounding line with high voltage system.
It is not allowed to catch the electric welding system. Users should not change the type, standard, attended mode and interface in any conditions. And it must operate follow the GB3836.1銆丟B3836.2 or GB3836.4 direction for use strictly.
After cutting the external electric supply, you can open the preoperculum of converter.
i) When operating flow meter, we should open the valve slowly to increase flow rate gradually to avoid the intensified momentary airflow damaging the rotor of converter.

 
       
銆Form 1:

Nominal size

Flow specifications

Header type

L(mm)

L1(mm)

H(mm)

H1(mm)

D(mm)

n-d(n-M)

Weight(kg)

Filter dimension(mm)

25

A

Electronic type

256

179

171

312

85

4-桅
14

6.5

240

B

282

192

6.7

A

Mechanical

269

191

 

5.5

B

295

204

 

5.7

40

A

Electronic type

306

208

171

312

110

4-M16

7.2

270

B

342

226

8.1

A

Mechanical

308

210

 

6.2

B

345

228

 

7.1

50

A

Electronic type

322

216

171

312

125

4-M16

11.5

300

B

376

243

14.0

A

Mechanical

330

221

 

10.5

B

385

248

 

13.0

80

A

Electronic type

371

234

210

332

160

8-M16

20.0

380

B

431

264

22.4

A

Mechanical

378

237

 

19.0

B

438

268

 

21.4

100

A

Electronic type

426

261

274

364

180

8-M16

33.0

440

B

496

296

36.5

A

Mechanical

442

275

 

32.0

B

512

310

 

35.5

銆FORM 2

Nominal size(mm)

flow specification

flow range(m3/h)

flow tumor-initiating(m3/h)

Maximum crushing(kPa)

Nominal pressure (MPa)

Medium temperature(鈩)

25

A

0.6锝10

0.09

0.11

1.6

-25锝+55

B

0.8锝16

0.10

0.13

40

A

1.0锝25

0.11

0.14

B

1.2锝40

0.13

0.16

50

A

1.3锝65

0.15

0.17

B

1.5锝100

0.16

0.18

80

A

2.4锝160

0.22

0.20

B

4.5锝220

0.40

0.25

100

A

7.0锝280

0.60

0.30

B

9.0锝400

0.70

0.35

 
 
BACK
 
Home        Product        About Us        Our city        Site Map
Tell:86-755-25887166    Email:ywh1995@126.com    Company:SHENZHEN YAWEIHUA INDUSTRY CO.,LTD.
Copyright© 1995 - 2009 Egypt.com Inc. All rights reserved