Smartec CLD18

Endress+Hauser

7

Installation factor

In confined installation conditions, the walls affect the ionic current in

the liquid. This effect is offset by what is referred to as the installation

factor. The installation factor can be entered in the transmitter for the

measurement or the cell constant is corrected by multiplying by the

installation factor.

The value of the installation factor depends on the diameter and the

conductivity of the pipe nozzle as well as the distance a between the

sensor and the wall.

The installation factor can be disregarded (f = 1.00) if the distance to the

wall is sufficient (a > 20 mm, from DN 60).

If the distance to the wall is shorter, the installation factor increases for

electrically insulating pipes (f > 1) and decreases for electrically

conductive pipes (f < 1).

It can be measured using calibration solutions, or a close approximation

can be determined from the following diagram.

A0037972

 6

CLD18 installation

a

Wall distance

1

2

a [inch]

0

10

20

30

40

a [mm]

0.95

1 00

.

1.05

f

0.39

0.79

1.18

1.57

A0020517

 7

Relationship between installation factor f and wall distance a

1

Electrically conductive pipe wall

2

Electrically insulating pipe wall

‣ Install the measuring system in such a way that the housing is not exposed to direct sunlight.

Environment

Ambient temperature

Stainless steel process connection:

–20 to 60 °C (–4 to 140 °F)

PVC process connection:

–10 to 60 °C (14 to 60 °F)

Storage temperature

Stainless steel process connection:

–25 to 80 °C (–13 to 176 °F)

PVC process connection:

–10 to 60 °C (14 to 140 °F)

Humidity

≤ 100 %, condensating

Climate class

Climate class 4K4H as per EN 60721-3-4

Degree of protection

IP 69 as per EN 40050:1993

Degree of protection NEMA TYPE 6P as per NEMA 250-2008

Shock resistance

Complies with IEC 61298-3, certified up to 50 g

Vibration resistance

Complies with IEC 61298-3, certified up to 5 g