Installation Note; Installation Examples; Operating Conditions - Noding P142 Betriebsanleitung

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P142

Operating instructions level transmitter

SAFETY NOTES

The level transmitter P142 is a hydrostatic pressure sensor for measuring

the level of liquids. If used incorrectly, application related dangers may

arise, e.g. product overflow through incorrect installation or adjustment.

The transmitter must be installed, connected, commissioned, operated

and maintained by qualified and authorised personnel only, under strict

observance of these operating instructions, relevant national standards

legal requirements, and where appropriate, the product certification.

Operating pressures and overpressures are to be observed, see type label

and data sheet.

SPECIFIC CONDITIONS OF USE

1. It must be ensured that there is no damage to the membrane during

installation, operation or maintenance. Dangers caused by aggressive

media or mechanical stress must be excluded. If the membrane is

damaged, the level probe must be taken out of operation and replaced

immediately. Repairs can only be carried out by the manufacturer. With

a damaged membrane, neither the intrinsic safety of the probe nor its

measurement accuracy can be guaranteed.

2. The connection cable must be laid protected. Static charge and

mechanical stress must be excluded. The manufacturer is not liable for

damage resulting from improper use.

3. The housing of the probe must be connected to the equipotential

bonding of the system by a direct conductive connection or by connec-

ting the cable shielding.

INSTALLATION

The protective cap should remain mounted during operation because it

protects the membrane from contaminants in the medium. The function

of the transmitter is nearly independent of its orientation. A sideways

movement of the cable probe can lead to measuring errors.

Therefore, install the probe at a point free from flow and turbulence,

or use a guide tube. The cable must end in a dry room or in a proper

terminal housing with GORE-TEX® filter.

OPERATING CONDITIONS

Ui ≤ 30 V, Ii ≤ 150 mA, Pi ≤ 750 mW

The effective internal inductance of level transmitter and cable

conntection is 0 µH + cable length [m] * 1 µH/m

The effective internal capacitance of level transmitter and cable

conntection is 11,12 nF + cable length [m] * 200 pF/m

PT100 or PT1000 option only: Ui ≤ 20 V, Ii ≤ 320 mA, Pi ≤ 100 mW

The effective internal inductance of level transmitter and cable

conntection is 0 µH + cable length [m] * 1 µH/m

The effective internal capacitance of level transmitter and cable

conntection is 0 nF + cable length [m] * 200 pF/m

All electrostatic charges of cables or plastic components through friction

or flowing media must be prevented by the user.

Nöding Messtechnik GmbH • Oldenfelder Bogen 29 • D-22143 Hamburg, Germany • Tel.: +49 40 67 58 51 – 0

Fax: +49 40 67 58 51 – 49 • Internet: www.noeding-messtechnik.de • E-mail: info@noeding-messtechnik.de