Model 41 Nullmatic Pressure Regulators
Contents
1. Siemens Industry Inc INSTALLATION AND SERVICE INSTRUCTION D41 Rev 13 June 2012 Supersedes Rev 12 Model 41 Nullmatic Pressure Regulators INTRODUCTION The Model 41 Nullmatic Pressure Regulator shown below uses the null balance principle which holds the output pressure constant regardless of wide changes in flow or supply pressure Each regulator is in essence a self contained pressure controller that can deliver up to a 40 scfm flow rate This instruction has five major sections Introduction Installation Principle of Operation Maintenance and Parts List Model Designation Model Series 41 A 50 41 Options A Air Loaded N Nonbleed no letter Standard Range 15 0 1 to 15 psi 30 0 15 to 30 psi 50 0 15 to 50 psi 100 0 2 to 100 psi 2550 24 5 to 50 psi General Specifications Supply Pressure eee eeeeeeeeeeeeeeeeeceseeeeensees See Table below Model No Recommended psi Maximum psi Minimum 41 15 75 150 5 psi above output 41A15 75 150 setting to be used AINI5 75 150 Note Performance 41 30 120 150 will be improved by 41A30 120 150 increasing the supply 41 50 120 150 7 psi above output ia ea ag 41A50 120 150 setting to be used i 41 2550 120 150 41 100 150 250 41A100 150 250 Maximum Capacity seseseeeeeeeeereersererrsreeresreeresen 9 scfm with 100 psi supply and 25 psi output Maximum Air Loading oo eee eee eee cseeereeeee 12. Replacing Parts Refer to the parts list s at the back of this instruction when performing maintenance on a Model 41 A parts list provides a list of replacement parts and an exploded view of the regulator Service kits containing spare and replacement parts are available from Siemens See the Customer Product Support section to contact Siemens Refer to the Parts List section for kits and recommended on hand spare parts SD41 Customer Product Support Support is available through an online Support Request service a link is provided in the table at the end of this section When contacting Siemens for support e Please provide complete product information For hardware this information is provided on the product nameplate part number or model number serial number and or version For most software this information is given in the Help gt About screen e If there is a problem with product operation Is the problem intermittent or repeatable What symptoms have been observed What steps configuration changes loop modifications etc were performed before the problem occurred What status messages error messages or LED indications are displayed What troubleshooting steps have been performed Is the installation environment e g temperature humidity within the product s specified operating parameters For software does the PC meet or exceed the minimum requirements e g processor memory operating syst
3. in PDF Instrumentation In the column to the right click Support gt Manuals In the column to the left select the product line e g Pressure or Temperature or Controllers to open navigation and search panes Note Navigation may change as the site evolves Warranty The sales contract contains the entire obligation of Siemens The warranty contained in the contract between the parties is the sole warranty of Siemens Any statements continued herein do not create new warranties or modify the existing warranty Teflon is a registered trademark of E I du Pont de Nemours and Company All product designations may be trademarks or product names of Siemens Industry Inc or other supplier companies whose use by third parties for their own purposes could violate the rights of the owners Siemens Industry Inc assumes no liability for errors or omissions in this document or for the application and use of information in this document The information herein is subject to change without notice Procedures in this document have been reviewed for compliance with applicable approval agency requirements and are considered sound practice Neither Siemens Industry Inc nor these agencies are responsible for product uses not included in the approval certification s or for repairs or modifications made by the user SD41 PARTS LIST Siemens Nullmatic Pressure Regulator Model 41 N N Vlg CHL aLe TSS t
4. service regulators with no N in the model OUTA number will exhaust approximately 0 1 scfm out of the holes in the exhaust ring MAINTENANCE Figure 2 Schematic Most problems associated with pneumatic instruments can be prevented by providing clean dry oil free instrument quality air as described in Installation Instrument Air Requirements No routine maintenance procedures are recommended if these requirements are observed Refer to the Trouble Analysis table on the next page when troubleshooting the regulator Lubricating the Adjusting Screw An occasional application of light grease to the adjusting screw threads will facilitate easy turning of the adjusting knob especially in the high pressure models Cleaning the Restriction Screw If the small orifice in the restriction becomes blocked press the cleaning plunger built into the body of the regulator The spring loading in the assembly permits it to return to its normal position SD41 Cleaning the Valve Plunger 1 Turn off supply air 2 Remove the retaining nut on the bottom forging The valve plunger and plunger spring will drop out when this nut is removed be careful not to lose them 3 Clean the valve plunger on both the ball and tapered end surfaces If necessary use a non abrasive solvent 4 Clean the supply seat and exhaust seat The exhaust seat can be reached using a tobacco pipe cleaner Here again use non abrasive solvents 5 Install removed parts
5. 00 psi air loaded models only Ambient Temperature Limits 0 cee eeeeeeseeeeeee 40 C to 82 C 40 F to 180 F SD41 INSTALLATION Refer to Figure 1 for mounting dimensions connections and mounting configurations The regulator may be mounted in any position in a reasonable vibration free location CAUTION Exceeding the ambient air temperature limits can adversely affect performance and may cause damage Pneumatic Connections All connections are 1 8 NPT Recommended piping to the regulator is 1 4 O D tubing although any scale free piping may be used 1 Blow out all piping before any connections are made to prevent dirt or chips from entering the regulator 2 Use pipe sealant sparingly and then only on the male threads A non hardening sealant is strongly recommended 3 Connect the regulator to a source of clean dry oil free instrument air See Instrument Air Requirements CAUTION Supply pressure in excess of the maximum value listed in General Specifications may cause damage Air loading pressure in excess of 100 psi may cause damage in air loaded models 174 MAX PANEL THICKNESS 1 2 DIA HOLE REQUIRED FOR PANEL MOUNTING AIR LOADING CONNECTION MODEL 41A ONLY _ PUSHBUTTON 3 3 16 RESTRICTION SUPPLY OUTPUT IN GAUGE TAP 2 1 4 DIA Figure 1 Dimensions and Mounting Instrument Air Requirements Connect the regulator to a source of clean dry oil free instrument air
6. Failure to do so will increase the possibility of a malfunction or deviation from specified performance CAUTION A Use of process fluids other than instrument air is not recommended No claim is made as to the suitability of this product for use with other process fluids such as hazardous gases except as listed on the appropriate certificate Non approved instruments are suitable for use with instrument air only Optional features and modifications such as tapped exhaust do not imply suitability for use with hazardous gases except as listed on the approval certificate CAUTION Synthetic compressor lubricants in the air stream at the regulator may cause the regulator to fail SD41 There are many types of synthetic lubricants Some may not be compatible with the materials used in construction of the regulator Wetting of these materials by such an oil mist or vapor etc may cause them to deteriorate This may ultimately result in failure of the regulator The following materials are in contact with instrument air Aluminum Brass Buna N Delrin Neoprene Stainless Steel and Teflon The requirements for a quality instrument air supply can be found in the Instrument Society of America s Quality Standard for Instrument Air ISA S7 3 Basically this standard calls for the following Particle Size The maximum particle size in the air stream at the instrument should be no larger than 3 microns Dew Point The dew point at line pres
7. e BIN eS a S BNF NEM RSMo PEN td NY INQ Z h 4 27 Drawing 6751PL 12 81 Supersedes 1 81 wawa E ZZZ oa T AIR LOADED MODELS 41 15 41 30 41 50 41 100 41 2550 41A15 41A30 41A50 41A100 41N15 IMPORTANT MODELS 41A ONLY 14965 15S2 14965 30S2 14965 50S2 14965 100S2 8678S10 6755 15S2 6755 3052 6755 100S3 10895 160S4 Service Parts Kits are available for servicing the instrument Contact Siemens for currently available kits refer to the Customer Product Support section of this instruction Some parts in this Parts List may not be available for separate purchase Recommended On Adjusting Screw Assy Adjusting Screw Assy Slotted Adjusting Screw Locknut Mounting Nut Top Housing Assy Top Housing Assy Spring Seat Leat Spring Assy Pilot Ring Assy incl Items 19 20 es w aeljj oo 4 22 amp 23 Diaphragm Spacer Differential Spring All 15 amp 30 Modets Differential Spring Except 15 amp 30 Modeis Pilot Plunger Valve Spring Retaining Nut Pilot Base Lower Diaphragm Assy Exhaust Ring incl item 18 Diaphragm Ring Assy incl Item 18 Hana Spare Parts gt team US A 128 Superseces 1 81 6750 69 10320 17 2938 16 6750 83 6750 136 10320 25 10320 10 6750 39 6750 40 6750 37 6750 38 8678 7 2938 4 10963 73 6750 137 6750 139 Screen Cleaning Plunger O Ring Upper Diaphragm Assy Except 414100 Up
8. em e A copy of the product Service Instruction User s Manual or other technical publication should be at hand The Siemens public Internet site see the table has current revisions of technical literature in Portable Document Format for downloading e To send an instrument to Siemens for warranty or non warranty service call Customer Service and Return to request a Return Material Authorization RMA see the table below IMPORTANT An instrument must be thoroughly cleaned decontaminated to remove any process materials hazardous materials or blood borne pathogens prior to return for repair Read and complete the Siemens RMA form s For support and the location of your local Siemens representative refer to the table below for the URL of the Process Instrumentation PI portion of the Siemens public Internet site Once at the site click Support in the right column and then Product Support Next select the type of support desired sales technical see the table below documentation or software SD41 Online Support Request http www siemens com automation support request Technical Support 1 800 333 7421 8 a m to 4 45 p m eastern time Monday through Friday except holidays Customer Service amp Returns 1 800 365 8766 warranty and non warranty Public Internet Site http www usa siemens com pi Technical Publications Click the above link to go to the Siemens Internet site and then click Process
9. per Diaphragm Assy 41A100 Only Plunger Stop Screw Plunger Spring Spring Blue 0 15 psi Spring Red 0 30 psi Spring Brown 0 50 psi Spring Green 0 100 psi Spring Orange 25 50 psi O Ring Mounting Bracket Opt Screen Spring Hardware 10 32 x 1 1 4 Lg Fill Hd Screw 10 Lockwasher Always Soecrty Range Serial No or Other Namepiate information When Ordering Spare Parts
10. see the parts list for part orientation Tighten the retaining nut securely Disassembling the Regulator Before disassembling back off the adjusting knob to relieve spring tension Also make a diagonal mark across all mating parts to provide easier alignment of parts during reassembly To disassemble the regulator refer to the parts list drawings for part location and remove the body screws Assembling the Regulator The exhaust diaphragm assembly and exhaust ring must be positioned so that none of the holes on the pilot base are blocked The external holes on the exhaust ring line up under the output connection Position the cleaning plunger of the pilot ring assembly in line with the input connection of the pilot base Locate the upper diaphragm and top housing in any position insert and tighten body screws Trouble Analysis Symptom Cause Remedy No output No supply air Turn on supply air Clogged restriction Press cleaning plunger Output cannot be Supply air setting too low Raise to recommended value increased to full value Valve plunger being held open on Remove valve plunger and exhaust seat by a chip e g pipe dope clean the seat Teflon tape thread shaving pipe scale Usually detected by a heavy exhaust Changing the Range The range of any Model 41 regulator may be changed by replacing the range spring differential spring the upper diaphragm assembly and other parts as noted in the parts list
11. sure should be at least 10 C 18 F below the minimum temperature to which any part of the instrument air system is exposed at any season of the year Under no circumstances should the dew point at line pressure exceed 2 C 35 6 F Oil Content The maximum total oil or hydrocarbon content exclusive of non condensables should not exceed 1 ppm under normal operating conditions PRINCIPLE OF OPERATION A fine turn precision screw is used to manually load the range spring which sets the regulated pressure When the adjusting knob is turned clockwise for example the increased spring force is exerted on the top diaphragm assembly which decreases the nozzle clearance and increases the pilot pressure The source for pilot pressure is supply air flowing to air Loanne the pilot pressure chamber through the restriction screw Serine ONL The increased pilot pressure forces the exhaust diaphragm assembly downward closing the exhaust port contacting and moving the valve plunger and thereby opening the RESTRICTION supply port This increases the regulated output which also ie feeds back to the top diaphragm assembly The regulator locks up or throttles at the new output valve when the feed back force of the top diaphragm assembly equals the range spring force 3 ATMOSPHE RIC ee VENT DWH Reg C Ea ha PLUGGED ON BA V7 Eme lt A N MODELS ae a AR AIR SUPPLY REGULATED On dead end
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