Operating Instructions
Contents
1. Minimum supply voltage VDC 18 0 02 x resistance of receiver plus line Maximum supply voltage VDC 32 0 004 x resistance of receiver plus line Calibrated at factory using a 250 ohm load at 24 VDC Variations in the power supply voltage cause less than 0 02 mA change in the transmitter s current output per volt change in the power supply Termination Spade terminals are provided and can be crimped onto each 16 22 AWG conductor If you prefer an optional edge card connector is available Setra P N 280202 for quick disconnect of cable from transducer A protective cover is provided for the electrical terminals The material is polyvinyl chloride PVC It fits closely over the end of the electrical cable screw terminals and first 3 4 of transducer cover It protects the electrical connection from inad vertent contact with splashing or dripping fluids Adjustments with cover removed CAUTION TURN OFF EXCITATION POWER DUR ING COVER REMOVAL OR REPLACEMENT SENSITIVITY ADJUST LINEARITY ADJUST DO NOT TOUCH Zero Pressure Output Factory adjusted to 30mV nominal and can be adjusted by the air trim capacitor as shown in diagram Changing zero may begin to change sensitivity Note This product has a 1 2 FS cover effect for zero only span is not effected Please take the cover effect into consid eration when adjusting the zero pressure output Sensitivity Can be adjusted by potentiometer as shown on diagram U2. b the product has not been repaired or altered by anyone except SETRA or its autho rized 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 work man ship developed under normal installation use and service e SETRA is notified in advance of and the product is returned to SETRA transporta tion prepaid Unless otherwise specified in a manual or warranty card or agreed to in a writing signed by a SETRA officer 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 can not be repaired or replaced to a refund of the purchase price SETRA s 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 min atl i 159 Swanson Road Boxborough MA 01719 1 800 257 3872 978 263 1400 ali i cil cel SS0337 REV E 07 25 2012 wi M lant i
3. pressure units only Lower range units are subject to excessive thermal zero shift unless vented to atmosphere The 280E Series gage pressure transducers and transmitters are vented to atmosphere at the connector end where the edge card protrudes from the case Do not seal around the edge card Electrical Connections 280E 030 5 03 VDC output For 24 VDC Excitation Nominal IN Connect to 15 30 VDC Power Supply OUT Connect to Control of Pressure Monitor COM Connect as Common Return Lead for IN and OUT Caution Care must be taken when installing this transducer that the excitation voltage is not ap plied to the output lead by mistake Excitation power or voltage in excess of 30 VDC inad vertently applied to the output lead may damage the electrical circuit Shielding or other precautions should also be provided to assure that transient voltages in excess of 30 VDC are not applied to the output lead C280E 4 20 mA output The circuit is designed to operate as a true two wire 4 to 20 milliampere pressure transmit ter and will deliver rated current into any external load between zero and 800 ohms Setra Pressure Transmitter Dc Voltage Source CAUTION The C280E Series is designed to have current flow in one direction only please observe polarity We suggest that the electrical cable shield be connected to the system s loop circuit ground thereby improving electrical noise rejection Excitation
4. ai es vil OU A A Operating Instructions Models 280E C280E Pressure Transducer and Pressure Transmitter Three Wire Voltage Output Two Wire Current Output 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 Pressure ranges and dimensions are reported on the specification bulletin for the transducer Installation Do not use in ambient conditions corrosive to stainless steel submerge in liquids subject to spray or drip or in a high vibration environment The 280 Series is slightly sensitive to accelera tion in the pressure fitting axis less than 0 05 psi g typical Factory calibrated in the vertical position with pressure port downward this position often minimizes potential damage from dripping of pressure system piping Installation of pressure fitting For very high pressure we suggest using a sealant such as Loctite hydraulic sealant For other pressure ranges standard sealants such as teflon pipe tape generally are satisfactory For the most sensitive pressure ranges excessive torquing of a metal pressure fitting may cause slight zero shift which may be trimmed out using zero adjustment Use of plastic fit tings often shows no noticeable zero shift The torquing effect does not appreciably affect linearity or sensitivity Use the wrench flats on the 280E or C280E when attaching to fittings Atmospheric Reference Gage
5. kage of returned material 1 Name and phone number of person to contact 2 Shipping and billing 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 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 war ranty repairs will not be made without approval and a purchase order to cover repair charges Calibration Services Setra maintains a complete calibration facility that is traceable to the National Institute of Standards amp Technology NIST If you would like to recalibrate or recertify your Setra pressure transducers or transmitters please call our Repair Department at 1 800 257 3872 978 263 1400 for scheduling cost and turnaround estimates Thank you Setra Systems Inc 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 fur nished by SETRA
6. nit factory adjusted to order specifications Other Adjustment Adjusted at factory Do not touch o0 y i own moa Adjustments with cover removed CAUTION TURN OFF EXCITATION POWER DUR ING COVER REMOVAL OR REPLACEMENT SENSITIVITY ADJUST LINEARITY ADJUST DO NOT TOUCH Zero Pressure Output Zero output can be adjusted 0 2 milliamperes about the nominal 4 mA The zero adjust ment is the air capacitor shown in the diagram Changing zero may begin to change sensi tivity This product has a 1 2 FS cover effect for zero only span is not effected Please take the cover effect into cancideration when adirncting the zero nrecciire o1tniit Span Adjustment Span can be adjusted approximately 0 5 mA from the nominal 16 mA full scale span The span adjustment potentiometer is located as shown in the diagram and may be adjusted without affecting linearity calibration Other Adjustment Adjusted at factory Do not touch RETURNING PRODUCTS FOR REPAIR Please contact Setra 1 800 257 3872 978 263 1400 before returning unit for repair to review information relative to your application Many times only minor field adjustments may be neces sary 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 pac
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