Setra Systems 278 Manuel utilisateur

Model 278

Barometric PressureTransducer

1.0 GENERAL INFORMATION

Your Setra barometric pressuretransducerhas been carefully calibratedbefore

shipment to you,and it should be handled with the same care given any

precisioninstrument.

The Model 278 barometric pressure transducer senses absolute pressure and

converts this pressure to a proportional high level analog output. Your

pressuretransducerhas one of the followingexcitationsandoutput:

Excitation Output

9.5 to 28VDC 0 to 2.5VDC

9.5 to 28VDC 0 to 5VDC

Checkthe label on theunit to confirm the excitationand output.

2.0 EMC Certification

Thisproductcomplieswith EN61326 ElectricalEquipmentforMeasurement,

Control and Laboratory use – EMC Requirements for Minimum Requirements

andIndustrial Locations. Specialcaution should be taken to meet Standard

EN61000-4-5:1995 Surge Immunity if any of the following conditions apply to

theinstallation: Theproduct is installedoutside;all or anypart of the cable is

exposed to the outside;the cable is greater than 30 meters in length. In order

tomeet the Surge Immunity requirements,thefollowingconditionsmustbe

followed during installation:

1.Shielded cable must be used,and the shield must be tied to earth ground (not power

supply ground) on at least one end of the cable shield/drain wire. The shield must be

maintained all the way from sensor to the power supply.

2. If unshielded cable is used,an earth grounded metal conduit fitting can be used to

replace the shielded cable.

3.For a sensor with a metal body or enclosure,the body/enclosure must be grounded to

earth.If a protective metal housing is used,the metal housing should be grounded to

earth

4.If a protectiveplastic housing is used,the housingmust beable towithstand at least

2KV fromthe housingto earth ground,without damagingthe circuit.

3.0 MECHANICAL INSTALLATION

3.1 Media Compatibility

Model 278 transducers are designed to be

usedwith air (up to95%RH) or non-con

ducting gases. Use with liquids or corrosive

gases may damage the unit.

3.2 Environment

Theoperatingtemperaturelimits of the

Model 278 are -40°Cto +60°C

(-40°F to +140°F).

3.3 Pressure Fittings

The Model 278 is supplied with a 1/8 inch

barbed fitting forthe pressureconnection

andtypicallyinstalledwith push-ontubing.

Installation Guide

3.6

2.4

in.

Front View

4.0 ELECTRICAL INSTALLATION

External accessto the Model 278 electrical terminationsisprovidedon

theterminalstripatthebottom of the unit.

4.1 Voltage Output Units

TheModel 278 barometric pressure transducerhasfiveelectrical

terminals available for wiring. This unit can be wired as a 4 wire (Fig.1) or

3 wire (Fig.2) device. Note: Four wire connection is recommended to

avoid the voltage drop in the negative power line, which can affect

the accuracy of the pressure measurement.

4.2 Adjustment for Continuous Operation

TheModel 278 has two operating modes: normal (operatingmode) and shut-

down (sleep mode). The unit is shipped in sleep mode (shutdown). To change

tonormal operation mode,anexternal trigger voltage is neededso that the

transducer can wake up and measures pressure. For continuous operation,the

“ExternalTrigger”,terminal 1,can also be wired with a jumper (external wire,not

provided)tothesupply,terminal4,(see Figure3).

1 EXTTRIG ExternalTriggerSignal

0VDC Sleep Mode

3-28VDC Operating Mode

2 AGND* Analog Signal Ground

3 GND* SupplyGround(NegativePower)

4 SUPPLY Supply (Positive Power)

5 VOUT VoltageOutput

*Both grounds (AGND and GND) are in the same electrical potential in the

transducer.

Terminal Function

No.

Figure 1 Figure 2

12 34 5 1 23 45

FourWire Connection ThreeWire Connection

12 34 5

Figure 3

5.0. CALIBRATION

The278transduceris factorycalibratedand should require no field adjustment.

6.0 RETURNING PRODUCTS FOR REPAIR

Pleasecontact a Setraapplicationengineer (800-257-3872,978-263-1400) before

returning unit for repair to review information relative to your application. Many times

onlyminor field adjustments may be necessary.Whenreturninga product toSetra,the

materialshould be carefully packaged,accompanied bythe“Service/Repair/Calibration

OrderReturn”form”on page 4 and shippedto:

Setra Systems,Inc.

159SwansonRoad

Boxborough,MA 01719-1304

Attn: RepairDepartment

Note: ReturnorderformisalsoavailableonSetra’swebsite@www.setra.com.

To assure prompt handling,please supply the following information and include it inside

the package or returned material (Return Order Form provided on page 7):

1. Name and phone number of person to contact.

2. Shippingandbilling instructions.

3. Full description of the malfunction.

4. Identify any hazardous material used with product.

Notes: Please remove any pressure fittings and plumbing that you have installed and

encloseanyrequiredmatingelectrical connectors andwiring diagrams.Allowapproxi-

mately3 weeksafter receipt at Setra for the repair and returnof the unit.

Non-warranty repairs will not be made without customer approvalandapurchase order

tocoverrepaircharges.

CalibrationServices

Setra maintains a complete calibration facility that is traceable to the National Institute of

Standards &Technology (NIST). If you would like to recalibrate or recertify your Setra

pressure transducers or transmitters,please call our Repair Department at 800-257-3872

(978-263-1400)forscheduling.

7.0 WARRANTY AND LIMITATION OF LIABILITY

SETRA warrants itsModel 278Transducerproducts to theoriginal consumerpurchaseragainst

defects for a period of two years from the date of sale by SETRA,as shown in its shipping documents.

Without charge,SETRA will repair or replace products found to have manufacturing defects within

thewarrantyperiod.

The serial number or date code must not have been removed,defaced or otherwise changed.SETRA

must be notified in advance of any returns;any products returned to SETRA must be transportation

prepaid.The foregoing warranty is in lieu of all warranties,express,implied or statutory,including

but not limited to,any implied warranty of merchantability for a particular purpose.

SETRA’s liability for breach of warranty is limited to repair or replacement,or if the goods cannot be

repairedor replaced,to a refundof thepurchase price. SETRA’s liabilityforall otherbreaches is

limited to a refund of the purchase price. In no instance shall SETRA be liable for incidental or

consequential damages arising from a breach of warranty,or from the use or installation of its

products.No representative or person is authorized to give any warranty other than as set out above

orto assumeforSETRA anyother liability in connection with the sale of its products.

SS2123RevA05/16/04

ISO

✓

Certified

9001:

2000

159SwansonRoad,Boxborough,MA01719-1304/Tel:800-257-3872/978-263-1400/

Fax978-264-0292/Email:[email protected],Web:www.setra.com

SetraSystems,Inc.

159Swansonroad

Boxborough,MA01719

RepairDept.Fax#:978-266-2158/Phone#:978-266-2194

✮ Alllinesmustbefilledout.

✮ Thisformmustaccompanyallreturns.Returnsthatarrivewithnoinformationwillberejected.

CONTACTNAME: _______________________ EMAILADDRESS: __________________________

COMPANY: __________________________ DATE: ________________________________

PHONENUMBER:_______________________ FAXNUMBER: ___________________________

PURCHASEORDERWITH“NOTTOEXCEED”AMOUNT CREDITCARD#,EXP.DATE/CARDHOLDERNAME:

MODEL/PART#ANDQTY: SERIALNUMBER/S:

EXPEDITE,1-3days($50FEE) RUSH,5-7days STDTIME,2-3weeks

CALIBRATIONONLY CERTNEEDED FAILUREANALYSIS

REASONFORRETURN/DESCRIPTIONOFPROBLEM:

NOTES/COMMENTSORSPECIALHANDLING

AnyproductthathasbeenusedwithHazardousMaterialsmustbe100%purgedandshouldbeaccompaniedbyaMSDSsheet,

bagged,sealed,andtaggedaccordingly.Setrawillnotacceptdeliveryofanyproductexposedtochemicals,

radioactiveagents,orbiologicalprocesswithoutevidenceofdecontaminationorlaboratoryanalysis,and

proofthebiologicalprocessisnotharmful.

Hazardouschemicals: Yes No (circleone)

ListofChemicalsused:_________________________________________________________

Hasunitbeenpurged? Yes __ No __ Purgedwithwhat? ____________________

Hasunitbeenflushed? Yes __ No __ Flushedwithwhat? ____________________

Hasunitbeendecontaminated: Yes __ No __ ExplainProcess: ______________________

Allwettedsurfaceshavebeenremoved: Yes __ No __

BillingAddress: ShippingAddress

MethodofShipment:

(circleone) PPD: Yes Collect: Yes Pleaselistaccount#

SERVICE/REPAIR/CALIBRATION ORDER RETURN FORM

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