Setra Systems 278 User manual
1
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
91
2.4
61
in.
mm
Front View
2
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
VV
12 34 5
Figure 3
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.
4
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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