AM7000 Series METAL TUBE VARIABLE AREA FLOWMETER

TG-F2026-E21

24

TOKYO KEISO CO., LTD.

b. Viscosity limit

In case the Viscosity of fluid is more than 1mPa·s, confirm the suitability shown in the fiigure below. Trace viscosity and flow rate and

confirm the crossing point is below the curve. If the crossing point is above the curve, consult factory for detailed calculation by com

puter.

●

Viscosity curve

Flow rate [L/h]

Viscosity

[mPa·s]

c. Slurry application

Consult factory if contaminations, sand, dirt and other solid particles are expected in fluid. AM7

□□□/SL series slurry flowmeter is avail-

able.

2. Gas application

Generally, flowmeters with damper (Model AM71

□□/DU, AM72□□/DU, AM73□□/DU, AM73□□DL, AM76□□/DL, AM77□□/DL) are rec-

ommended for gas application to prevent float vibration.

Selection of meter size

Maximum possible flow rate for each meter size is shown in dimension tables of AM71

□□/DU, AM72□□/DU, AM73□□/DU, AM73□□/

DL, AM76

□□/DL, and AM77□□/DL flowmeters.

If actual fluid condition is different from such figures, a conversion calculation is to be performed by the following formula:

QA = Q

×0.0169×

× (273+t) / (0.1013+p)

QA : Converted ow rate in air 0°C, 1atm [m3/h(nor)]

: Density of gas to be measured [kg/m3(nor)]

p : Pressure of gas to be measured (MPa)

t : Operating temperature (°C)

Example Gas to be measured

: Nitrogen (N2)

Specic weight (

ρ ) : 1.251kgf/m3(nor)

Operating pressure ( p ) : 0.6MPa

Operating temperature ( t ) : 20°C

Flowmeter to be used : AM73

/DU

QA = 300

×0.0169× 1.251× (273+20) / (0.1013+0.6)

= 300

×0.0169×22.86

= 115.9 [m3/h (nor)]

ρ

ρ

SELECTION OF FLOWMETER

1. Liquid application

a. Selection of meter size

Maximum possible flow rate each meter size is shown in dimension tables from Page 15 to 22. These figures are based on water flow (Den-

sity 1.0g/cm3 and Viscosity 1.0MPa·s). If actual fluid condition is different from such figures, a conversion calculation is required as follow-

ing formula:

Qw = Q

×2.59 / (7.7/ ) -1

Qw : Water converted ow rate (m3/h)

Q : Flow rate of actual uid (m3/h)

: Density of actual uid (g/cm3)

Example Fluid: Alcohol

Density: 0.8g/cm3

Flow rate: 50m3/h

Flowmeter to be used: AM71

ρ

ρ

Qw = 50

×2.59 / (7.7/0.8) -1

= 50

×0.882

= 44.1(m3/h)

Referring to table 1 on Page 15, the required meter size is 100. For possible connection flange sizes, refer to Table 45.

Referring to table 15 on Page 17, the suitable meter size is 25. For possible connection flange sizes, refer to Table 45.