Table 3 Keys of testing the circuit components

A

–

Adjustable pressure regulator

B

–

Shut-off valve

Preferably with straight flow path

C

–

Upstream flow meter

D

6.5

Upstream temperature-measuring tube

E

–

Upstream temperature-measuring instrument

Sensor located on axis of D at distance > 3d upstream of the end of D

F

6.5

Transition connector upstream side

G

–

Upstream pressure gauge or transducer

H

–

Component under test

I

–

Downstream gauge meter or transducer

J

6.5

Transition connector downstream side

K

–

Downstream temperature-measuring instrument

L

6.5

Downstream temperature-measuring tube

M

–

Downstream flow meter

N

–

Flow control valve

With a flow-rate capacity greater than the component under test

O₁

6.5

Upstream pressure-measuring tube

Apply to tube or thread connector

O₂

6.5

Downstream pressure-measuring tube

Apply to tube or thread connector