Ashcroft KM45 Instruções de instalação

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KM41 or KM45 PRESSURE

TRANSMITTER INSTALLATION

INSTRUCTIONS

WARNING! READ

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 trans-

ducer may cause irreversible elec-

trical and/or mechanical damage to

the pressure measuring and containing

elements.

Fluid hammer and surges can destroy

any pressure transducer and must

always be avoided. A pressure snub-

ber should be installed to eliminate

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 damag-

ing 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.

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

Symptoms of fluid hammer and surge's

damaging effects:

• Pressure transducer exhibits an out-

put at zero pressure (large zero offset).

• Pressure transducer output remains

constant regardless of pressure

• In severe cases, there will be no

output.

FREEZING:

Prohibit freezing of media in pressure

port. Unit should be drained (mount

in vertical position with electrical ter-

mination upward) to prevent possible

overpressure damage from frozen

media.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be suscepti-

ble 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 suit-

able ground.

DESCRIPTION

The Ashcroft Model KM41 or KM45 pres-

sure transmitter is a high performance

instrument intended for use in applica-

tions where the process media is com-

patible with the 17-4PH (KM41) or 316L

(KM45) stainless steel sensor material

and process connection.

MECHANICAL INSTALLATION

Environmental

The KM41 or KM45 transmitter can be

stored and used within the temperature

limits of -40°C to 125°C (-40°F to 257°F).

IP67 (ingress protection) rating applies for

most configurations, install accordingly.

Mounting

The KM41 or KM45 transmitter requires

no special mounting hardware and can be

mounted in any orientation with negligible

position error. Although the units can with-

stand considerable vibration without dam-

age or significant output effects, it is always

good practice to mount the transducer

where there is minimum vibration. For

units with NPT type pressure fittings apply

sealing tape or an equivalent sealant to

the threads before installing. When instal-

ling 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 on the housing. A 22mm (

wrench can 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

KM41 or KM45 models with detachable

electrical connectors a 6 point deep socket

can also be used to install the unit.

Electro-Magnetic Interference

The circuitry of the KM41 or KM45 trans-

miter 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 possible avoid

running the termination wiring near induc-

tive equipment.

Field Adjustments

The KM41 or KM45 transmiter is precisely

calibrated and temperature compensated

at the factory to ensure long and stable

performance. There are no field accessible

adjustments on the KM41 or KM45

transmiter.

ELECTRICAL INSTALLATION

Please refer to the reverse of this page for

power supply requirements and for appro-

priate wiring protocol based on the partic-

ular output signal and electrical termina-

tion features of the unit being installed.

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