Ashcroft km46 Installatie-instructies

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KM46 PRESSURE

TRANSMITTER INSTALLATION

INSTRUCTIONS

m WARNING! READ m

BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or dam-

age may be caused by excessive

overpressure, excessive vibration

or pressure pulsation, excessive

instrument temperature, corrosion

of the pressure containing parts,

or other misuse. Consult Ashcroft

Inc., Stratford, Connecticut, USA

before installing if there are any

questions or concerns.

2. OVERPRESSURE:

Pressure spikes in excess of the

rated overpressure capability of the

transducer may cause irreversible

electrical and/or mechanical dam-

age to the pressure measuring and

containing elements.

Fluid hammer and surges can

destroy any pressure transducer and

must always be avoided. A pressure

snubber should be installed to elim-

inate the damaging hammer effects.

Fluid hammer occurs when a liquid

flow is suddenly stopped, as with

quick closing solenoid valves. Surges

occur when flow is suddenly begun,

as when a pump is turned on at full

power or a valve is quickly opened.

Liquid surges are particularly dam-

aging to pressure transducers if the

pipe is originally empty. To avoid

damaging surges, fluid lines should

remain full (if possible), pumps should

be brought up to power slowly, and

valves opened slowly. To avoid

damage from both fluid hammer and

surges, a surge chamber should be

installed.

Symptoms of fluid hammer and surge's

damaging effects:

• Pressure transducer exhibits an

output at zero pressure (large zero

offset).

• Pressure transducer output remains

constant regardless of pressure

• In severe cases, there will be no

output.

©Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA, Tel: 203-378-8281, Fax 203-385-0402 www.ashcroft.com

FREEZING:

Prohibit freezing of media in pres-

sure port. Unit should be drained

(mount in vertical position with elec-

trical termination upward) to prevent

possible overpressure damage from

frozen media.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be sus-

ceptible to damage when exposed

to static electrical charges. To avoid

damage to the transducer observe

the following:

• Ground the body of the transducer

BEFORE making any electrical

connections.

• When disconnecting, remove the

ground LAST!

Note: The shield and drain wire in the

cable (if supplied) is not connected

to the transducer body, and is not a

suitable ground.

DESCRIPTION

The Ashcroft Model KM46 pressure

transducer is a high performance

instrument intended for use in applica-

tions where the process media is com-

patible with Titanium sensor material

and process connection.

MECHANICAL INSTALLATION

Environmental

The KM46 transducer can be stored

within a temperature limit of -40°C to

125°C (-40°F to 257°F) and operated

within a temperature limits of -40°C to

105°C (-40°F to 221°F). IP65 or IP67

(ingress protection) rating applies for

most configurations depending on elec-

trical connection, install accordingly..

Mounting

The KM46 transmitter requires no spe-

cial mounting hardware and can be

mounted in any orientation with negligi-

ble position error. Although the units can

withstand considerable vibration without

damage or significant output effects, it

is always good practice to mount the

transducer where there is minimum

vibration. For units with NPT type pres-

sure fittings apply sealing tape or an

equivalent sealant to the threads before

installing. When installing or removing

the unit apply a wrench to the hex wrench

flats, located above the pressure fitting.

DO NOT tighten by using a pipe wrench

⁄

˝) wrench can

on the housing. A 22mm (

be used on the wrench flats of the hex (as

per DIN 894 or similar) with a tightening

torque of ~25Nm (20 ft lbs). For KM46

models with detachable electrical con-

nectors a 6 point deep socket can also be

used to install the unit.

Electro-Magnetic Interference

The circuitry of the KM46 transmitter

is designed to minimize the effect of

electromagnetic and radio frequency

interference. To minimize susceptibility

to noise, avoid running the termination

wiring in a conduit which contains high

current AC power cables. Where possi-

ble avoid running the termination wiring

near inductive equipment.

Field Adjustments

The KM46 transmitter is precisely cali-

brated and temperature compensated

at the factory to ensure long and stable

performance. There are no field accessi-

ble adjustments on the KM46 transmitter.

ELECTRICAL INSTALLATION

Please refer to the reverse of this page

for power supply requirements and for

appropriate wiring protocol based on

the particular output signal and electri-

cal termination features of the unit being

installed.