Operating Instructions Model 276 Barometric Pressure
Contents
1. Q POOT qe a an mt i lll A 7 Certified Operating Instructions Model 276 Barometric Pressure Sensor General Information Your Setra transducer has been carefully calibrated before shipment to you and it should be handled with the same care given any precision instrument Accuracy and dimensions are reported on the specifica tions bulletin for the transducer The label on the unit specifies the calibrated output voltages at the low end and the high end of its pres sure ranges Ambient Conditions Do not use in ambient conditions corrosive to the stainless steel housing or PVC jacketed cable sub merge in liquids or subject to spray or vibration environment Electrical Connections Belden Cable Lead Function 8723 Grey Cable positive excitation Red positive output Green negative output White negative excitation Black case Shield Electrical The electrical circuit is a 3 terminal circuit Separate leads for negative output and negative excitation are provided for convenience in wiring but are internally commoned Use of these leads also avoids errors in voltage readings caused by ground loops which can occur on 3 wire devices The pressure transducer should be operated with the shield connected either to the negative excitation wire or to the negative output wire Failure to do this may result in unsatisfactory operation of the unit NOTE The circuit is not protected against mis wiri2. SETRA transportation prepaid Unless otherwise specified in a manual or warranty card or agreed to in a writing signed by a SETRAofficer SETRA pressure and acceleration products shall be warranted for one year from date of sale 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 repaired or replaced to a refund of the purchase price SETRAs liability for all other breaches 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 or to assume for SETRA any other liability in connection with the sale of its products 159 Swanson Road Boxborough MA 01719 1304 800 257 3872 il 978 263 1400 Fax 978 264 0292 WEB www setra com all inl el ll E mail transducer sales setra com uD W i
3. ng Use extreme care in wiring the positive excitation voltage only to the red wire and to ensure all four leads are correctly connected before applying power REVERSED OR MIS WIRED EXCITATION MAY CAUSE PERMANENT DAMAGE TO THE TRANSDUCER In some instances use of long cables several hundred feet long may introduce enough cable capaci tance into the output circuit to cause output oscillation If encountered this oscillation may be eliminated by connecting a 100 ohm resistor 1 8 watt or larger in series to each of the output leads at the end of the 2 foot transducer cable These series resistors add to the output resistance Calibration This unit has been precision calibrated at the factory It has been designed to be inherently stable recalibration adjustments are not normally field accessible If you do wish to perform a recalibration and have access to a high accuracy primary pressure standard call the factory for instructions on field access to the calibration adjustments RETURNING PRODUCTS FOR REPAIR Please contact Setra 1 800 257 3872 978 263 1400 before returning unit for repair to review informa tion relative to your application When returning a product to Setra the material should be carefully packaged and shipped prepaid to Setra Systems Inc 159 Swanson Road Boxborough MA 01719 Attn Repair Department To assure prompt handling please supply the following information and include it inside the package of returned ma
4. terial Name and phone number of person to contact Shipping and billing instructions Full description of the malfunction Identify any hazardous material used with product Poy gt Notes Please remove any pressure fittings and plumbing that you have installed and enclose any required mating electrical connectors and wiring diagrams Allow approximately 3 weeks after receipt at Setra for the repair and return of the unit Non warranty repairs will not be made without customer approval and a purchase order to cover repair charges LIMITED WARRANTY AND LIMITATION OF LIABILITY SETRA warrants its products to be free from defects in materials and workmanship subject to the following terms and conditions Without charge SETRA will repair or replace products found to be defective in materials or workmanship within the warranty period provided that a the product has not been subjected to abuse neglect accident incorrect wiring not our own improper installation or servicing or use in violation of instructions furnished by SETRA b the product has not been repaired or altered by anyone except SETRA for its authorized service agencies c the serial number or date code has not been removed defaced or otherwise changed and d examination discloses in the judgment of SETRA the defect in materials or workmanship developed under normal installation use and service e SETRA is notified in advance of and the product is returned to
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