OPERATING INSTRUCTIONS MODEL 205
Contents
1. aired or altered by anyone except SETRA or its authorized service agencies the serial number or date code has not been removed defaced or otherwise changed and examination discloses in the judgment of SETRA the defect in materials or workmanship devel oped under normal installation use and service SETRA is notified in advance of and the product is returned to SETRA transportation prepaid Unless otherwise specified in a manual or warranty card or agreed to in writing and 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 SETRAS 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 dh Min et a 159 Swanson Road Boxborough MA 01719 1 800 257 3872 978 263 1400 UU al SSO251REV C 11 8 122. ferenced power sup ply for excitation and separate isolated not POWER ground referenced readout or differential SUPPLY input to a data acguisition system for each pressure transducer output POWER SUPPLY Option 2 Uses a separate isolated power supply for each pressure transducer s excitation and a single ground referenced readout or single ended input to a data acquisition system for POWER SUPPLY DYMDAE PS Power Supply Nominal 24 VDC PT Pressure Transducer 4 Wire Circuit POWER DVM DAS Digital Volt Meter or Data Acguisition SUPPLY Option 3 Uses a single ground referenced power supply for excitation and either a single isolated readout with a bipolar switch that breaks before makes POWER pi both the output and output of each pres SUPPLY DYMDAS do sure transducer or a single data acguisition system with a multiplexer MUX NOTE The shield is internally commoned to the 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 please call our Repair Department at 1 800 257 3872 978 263 1400 for scheduling cost and turn RETURNING PRODUCTS FOR REPAIR Please contact Setra 1 800 257 3872 or 978 263 1400 before returning unit for repair to review infor mati
3. nly Lower range units are subject to excessive thermal zero shift unless vented to atmosphere The electrical cable provides this equalization vent ELECTRICAL CONNECTIONS CABLE LEAD FUNCTION Red positive excitation Green positive output White negative output Black negative excitation Shield case ELECTRICAL The electrical circuit is equivalent to a 4 terminal network which can be grounded at only one point either at the negative excitation or the negative output lead but must not be commoned or grounded at more than one point The negative output lead is approximately 1 66 VDC above the negative excitation lead The positive output lead is at this same 1 66 VDC common mode voltage plus the output signal from applied pressure thus goes from approximately 1 66 VDC up to 6 66 VDC above the negative excitation The pressure transducer must be operated with the case connected either to the negative excitation terminal or to the negative output terminal Failure to do this may result in dam age to or unsatisfactory operation of the unit This connection Linearity Adjust may be made by connecting the shield to white or shield DoNot Touch black leads Best shielding against noise will be obtained by connecting the shield and negative excitation black leads Circuit is reversed voltage protected for at least 5 minutes Internal transient suppression network is provided for short duration transients to 150 volts Zero Adjust to Sensiti
4. on relative to your application Many times only minor field adjustments may be necessary 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 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 warranty repairs will not be made without customer approval and a purchase order to cover LIMITED WARRANTY AND LIMITATION OF LIABILITY SETRA warrants its products to be free from defects in materials and workmanship subject to the fol lowing terms and conditions Without charge SETRA will repair or replace products found to be defec tive 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 the product has not been rep
5. sebra se el OPERATING INSTRUCTIONS MODEL 205 2 PRESSURE TRANSDUCER FOUR WIRE VOLTAGE 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 polyvinyl chloride cable or stainless steel sub merged in liquids subject to spray or drip or in a high vibration environment The 205 2 Series is very slightly sensitive to acceleration in the pressure fitting axis less than 0 05 psi g typical Fac tory calibrated in the vertical position with pressure port downward this position often minimizes damage from dripping of pressure system piping Installation of pressure fitting For very high pressure use of sealant such as Loctite hydraulic sealant is suggested For other pressure ranges standard sealants such as Teflon tape generally are satisfactory For the most sensitive pressure ranges excessive high torquing of a metal pressure fitting may cause a slight zero shift which may be trimmed out using the zero adjustment Use of plastic fittings often shows no noticeable zero shift The torquing effect does not appre ciably affect linearity or sensitivity Use the wrench flats on the 205 2 when attaching to fittings ATMOSPHERIC REFERENCE Gage pressure transducers o
6. vity Adjust In some instances use of long cables sev al hundred feet length may introduce enough cable capacitance into the output circuit to cause output oscillation If encountered this oscillation may be eliminated by con necting a 100 ohm resistor 1 8 watt or larger in series in each of the output leads at the end of the 2 foot transducer cable These series resistors of course add to the output resistance CAUTION Excitation power or voltage in excess of 15 VDC inadvertently applied to the output leads may damage the electrical circuit Care must be taken when installing this transducer that the excitation voltage is not applied to the output leads by mistake Shielding or other precaution should be provided to assure that transient voltages in excess of 15 VDC are not applied to the output leads ADJUSTMENTS with cover removed CAUTION TURN OFF EXCITATION POWER DURING COVER REMOVAL OR REPLACEMENT ZERO PRESSURE OUTPUT Unit factory adjusted to within 50 mV Can be adjusted by the air trim capacitor as shown in the diagram Any adjustments will begin to change sensitivity SENSITIVITY Can be adjusted by potentiometer as shown on diagram Unit factory adjusted to order specifica tions OTHER ADJUSTMENT Adjusted at factory Touching any adjustments other than zero output or sensitivity may necessi INSTALLATION INSTRUCTIONS FOR MULTIPLE HOOK UP OF A 4 WIRE SETRA PRESSURE TRANS Option 1 Uses a single ground re
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