Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 28)

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4-4

IM 01E30D01-01EN

4.4 Grounding Connection

IMPORTANT

Groundingresistanceof100Ωorlessis

necessary. When the optional code A is selected,

groundingresistanceof10Ωorlessshallbe

required.

In case of TIIS explosion proof type, grounding

resistanceof10Ωorlessisnecessaryforclass

A grounding terminal.

Groundingresistanceof100Ωorlessis

necessary for Functional grounding terminal.

For explosion proof type except TIIS, follow the

domestic electrical requirements as regulated in

each country.

Grounding terminals

F0407.ai

Figure 4.4.1 Functional Grounding Terminal

Location(General-purposeUse/

Explosion Proof Type except TIIS)

Class A grounding

Grounding

terminal

F0408.ai

Figure 4.4.2 Functional Grounding Terminal

Location (TIIS Explosion Proof Type)

IMPORTANT

Improper grounding can have an adverse effect

ontheowmeasurement.Ensurethatthe

instrument is properly grounded.

Theelectromotiveforceofthemagneticowmeter

is minute and it is easily affected by noise, and

the reference electric potential is the same as that

fthemeasuringuid.Therefore,thereference

electricpotential(terminalpotential)oftheowtube

and converter also need to be the same as that of

themeasuringuid.Moreover,thepotentialmustbe

thesameastheground.Themagneticowmeter

is equipped with a grounding ring that makes a

connectionwiththechargeofthemeasureduid

forgroundingandprotectsthelining.Theowmeter

shouldbegroundedbycertainspecications

(groundingresistanceof100Ωorless,or10Ωor

less) according to Figure 4.4.2.

Grounding is mandatory especially for insulated

piping such as PVC-sheathed pipes. If not, the

agneticowmetermeasurestheowincorrectly

becausethereferenceelectricalpotentialisoating.

Moreover, grounding is also mandatory in the

simultaneous outputs of current and pulse. If not,

theowmetercausesalargemeasurementerror

because the outputs interfere with each other.

F0409.ai

600 V vinyl-insulated cable

(2 mm

or larger)

[General - purpose Use/Explosion Proof Type

except TIIS]

• Class D requirements (ground resistance,

100 Ω or less).

Optional code A (lighting protector): Class C

requirements (ground resistance, 10 Ω or less).

• Explosion proof type except TIIS: Domestic

electrical requirements as regulated in each

country.

grounding ring

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