# Chromalox European Product Catalog

TECHNICAL INFORMATIONS - INFORMATIONS TECHNIQUES

www.chromalox.co.uk - www.chromalox.fr

ELECTRICAL DATA RAPPELS D’ÉLECTRICITÉ Technical informations Informations techniques

Electrical data Rappels d'électricité

Power formula / Loi de Joule

OHM'S law / Loi d'Ohm

P = U = I =

U = R = I =

Puissance en Watts Tension en Volts Intensité en Ampères

Tension en Volts Valeur ohmique en ohms Intensité en Ampères

P = U = I =

U = R = I =

Power in watts Voltage Current in amperes

Voltage Resistance in ohms Current in amperes

P = U.I

U = R.I

Variations / Variations

U 2 R

2

U P

P U

P i

U R

U i

P =

R =

I =

U =

I =

R =

Element connections /

Groupement de résistances

/

(Eléments "r" de puissance unitaire "p" sous leur tension nominale "u n ")

(Heating elements "r" of unit power "p" with nominal voltage "Un")

if "U" = "u n " : si "U" = "u n " :

Parallel wiring Cablage parallèle

Series wiring Cablage série

U

U

r (p)

r (p)

r (p)

r (p)

r (p)

R (P)

r (p)

no. of elements nbre d'éléments

p

R = 2r => P =

n = 2 :

2

NOTE: Watt density (W/cm 2 ) for each element is divised by 4 NOTA: Division par 4 de la charge (W/cm 2 ) dissipée par chaque élément p 3 R = 3r => P = n = 3 : NOTE: Watt density (W/cm 2 ) for each element is divised by 9 NOTA: Division par 9 de la charge (W/cm 2 ) dissipée par chaque élément p x R = xr => P = n = x : NOTE: Watt density (W/cm 2 ) for each element is divised by x 2 NOTA: Division par x 2 de la charge (W/cm 2 ) dissipée par chaque élément

R (P)

no. of elements nbre d'éléments

r 2

R =

=> P = 2p

n = 2 :

no. of elements nbre d'éléments

no. of elements nbre d'éléments

r 3

n = 3 :

R =

=> P = 3p

no. of elements nbre d'éléments

r x

no. of elements nbre d'éléments

n = x :

R =

=> P = x.p

NOTE: Watt density (W/cm 2 ) for each element is unchanged NOTA: Conservation de la charge (W/cm 2 ) dissipée par chaque élément

Element connections /

Couplage de résistances

Delta connection Couplage triangle

Star connection Couplage étoile

Normal using Utllisation normale

U = u n

U

U = u n

U = 1,7 u n

(I)

(I)

(I)

(I)

(I)

(I)

U = u n

U = u n

U

U

r (p)

r (p)

r (p)

P = 3p

Watt density (W/cm 2 ) for each element is unchanged Conservation de la charge (W/cm 2 ) dissipée par chaque élément

Watt density (W/cm 2 ) for each element is unchanged Conservation de la charge (W/cm 2 ) dissipée par chaque élément

r (p)

r (p)

P 1,7 U

P U 3

I =

=

u n

u n

r (p)

Elements supply voltage Tension nominale des éléments

Elements supply voltage Tension nominale des éléments

Other arrangments Autres combinaisons

P = p (Watt densityW/cm 2 divided by3) (charge W/cm 2 divisée par 3) P = 3p (Watt densityW/cm 2 unchanged) (maintien de la charge) un = 230V

un = 230V

un = 400V

un = 400V

P = 9p DANGER!! (Watt densityW/cm 2 multiplied by3) (charge W/cm 2 multipliée par 3) P = 3p (Watt density W/cm 2 unchanged) (maintien de la charge W/cm 2 )

P = p (Watt densityW/cm 2 divided by3) (charge W/cm 2 divisée par 3) P = 3p (Watt density W/cm 2 unchanged) (maintien de la charge W/cm 2 )

P = p / 3 (Watt densityW/cm 2 divided by9) (charge W/cm 2 divisée par 9) P = p (Watt densityW/cm 2 divided by3) (charge W/cm 2 divisée par 3)

Supply voltage Tension d'alimentation

U = 230V / 3ph

U = 230V / 3ph

U = 400V / 3ph

U = 400V / 3ph

10 - J - 14 238

06.07.10

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