M-900 Series MICRO FLOWMETER

2

TOKYO KEISO CO., LTD.

TG-F2287-E03

MODEL CODE

Construction

Function

Flow direction

Additional function 1

Additional function 2

Special

IS –

M–9

MODEL CODE

Contents

0

1

5

1

2

3

4

5

–

–

–

D

DU

VU

VL

–

–

–

Dust-proof and weatherproof

Intrinsically safe *2

Local indication

Pneumatic transmission

Alarm output with reed switch

Bottom to Top

Bottom to Top side

Bottom side to Top side

Bottom side to Top

Bottom rear to Top rear (only avail-

able for local indicator type)

With liquid damper *2

With gas damper

Needle valve at outlet

Needle valve at inlet

/Z

*1 Intrinsically safe type is applied only for alarm output type IS-M-95 .

*2 Liquid damper can be provided on the owmeters with Bottom side

and Bottom rear Top rear connections only.

ADITIONAL FUNCTION

1. Liquid damper Model M-9••-D

A damper mechanism is required for gas and steam

measurement especially at low pressure service to

prevent float hunting.

The damper installed at the bottom of flowmeter

ensures the accuracy and durability of flowmeter.

The damping mechanism works to reduce the

abrupt movement of float utilizing the resistance

generated between oil in the damper and damping

element connected to float rod.

The damper is recommended also for the liquid

service having a pulsation flow.

2. Gas damper Model M-9••-DU

The gas damper which requires no damper liquid

is available for gas measurement. A mechanical

damper consists of a cylinder and a piston

connected with float rod. This type needs no space

for damping mechanism at the bottom of flowmeter.

Therefore, this damper is applied for any direction

type of flowmeters which result in the flexibility of

piping design. Furthermore unnecessary re-filling of

damper liquid improves the maintenability.

The gas damper is effective for the low pressure gas

services which cause hunting of indication and for

the services which does not permit damping liquids.

It is highly recommended to have gas damper for

the services less than 0.3MPa pressure and without

needle valve at the downstream.

However, this type is applicable only for dry

gas services and not applicable for liquids nor

condensable vapors. Neither chlorine gas which is

synthesized easily with other chemicals nor gases

containing foreign materials like rust, dust and oil

is applicable because of the ingress into the piston

and cylinder which might lead to the malfunctioning

of the flowmeter.

3. Needle valve M-9••-V•

A needle valve used for flow rate control is

recommended at the downstream of flowmeter to

avoid hunting for gas measurement.

On the other hand, for liquid measurement the

pulsation may be eased by the valve located

upstream.

4. Magnet strainer. See clause "Accessories" at the

following page.

The iron particles contained in fluids may cause the

malfunctioning of flowmeter due to the attracted

irons on the moulded magnet in the float. The

particles can be eliminated with the magnet strainer

at the inlet of the flowmeter. For this purpose

dedicated strainer with 100 mesh (optionally 200

mesh) is available.

5. Purge set. See clause "Accessories" at the

following page.

Purge set of M-900 micro flowmeter and constant

flow valve keeps constant flow rate even supply

pressure or down stream pressure is fluctuated.