KOBOLD PSR/PS FLOW SWITCH
Contents
1. N O contact q di Clamp plate top of housing Blue white Red Switch assembly Cable connection Cable The PSR PS is pre adjusted at the factory as a normally open N O switch set to switch in approximately the middle of its range To change the setpoint consult Table 2 2 Construction and do as follows Slightly loosen the clamp plate screws 5 to allow movement of the reed contact 7 Decide whether you want to retain the normally open N O or change to the normally closed N C switching function The switch functions as an N O switch when the switch assembly 7 is positioned such that the tip of the red arrow is just emerging from flow switch housing 4 The switch functions as an N C switch when the switch assembly 7 is positioned such that the tip of the white arrow is just emerging from flow switch housing 4 The switch becomes less sensitive to flow i e activates at a higher flowrate as more of the arrow point is displayed pulled out of the housing When the red arrow is almost completely pulled out from the flow switch housing the switch function will transition from N O to N C The N C switching sensitivity can then be adjusted in similar fashion as noted above Rev 3 13 7 PSR PS Note If during adjustment the switch assembly 7 is pulled too far out of the flow switch housing 4 the switch will not function when the impact plate 3 1 is deflected If this occurs simply sl2. Note that the PSR must be installed so that flow direction in the pipe is as indicated by the arrow on the T piece The flow direction arrow on the PS series is stamped on the clamp plate The reed contact is simply an open closed type of switch connect appropriately Ensure that loads on the switch do not exceed the maximum ratings as given in Table 3 2 Remember that capacitive and inductive loads such as motors exhibit much greater voltage current requirements at start up and shut down than the typical operating values 3 1 Contact Protection Maximum values of current and voltage must not be exceeded on the reed switch When driving inductive or capacitive loads we recommend the use of an isolation relay KOBOLD supplies a line of relays for such instances Table 3 2 Reed Contact Electrical Data Maximum Current 1 5A Maximum Voltage SPST 250 VAC Maximum Voltage SPDT 150 VAC Maximum Power Dissipation SPST 50 4 50 1 5 4 Maximum Power Dissipation SPDT 20VA 20W70 5 A Electrical Cable Length 5 ft Std Environmental Protection NEMA 4 IP 65 Rev 3 13 PSR PS 6 4 0 Operation As described in Section 1 0 the PSR PS uses a paddle to activate a reed contact located at the top of the instrument The reed contact is simplv a N O or N C switch and should be wired as such 4 1 Adjusting the Setpoint Diagram 4 2 Adjusting the Setpoint Direction of flow NIC contact jie Setting ranges
3. use of media other than water mineral oil air and nitrogen Install the devices in a fully supported position within your flow system This avoids excessive stresses which may damage the instrument In particular a Ensure that the plumbing leading to and from the instrument is fully supported and that the instrument does not perform the physical function of a joint b When calculating stress on the device caused by plumbing the weight of the medium in the pipes must be considered as well c Misaligned runs of rigid piping can cause large stresses when connected to the instrument Do not connect in such a fashion During installation avoid stresses on the instrument by following guidelines given below a When connecting fittings hold the instrument fittings rigid with a correctly sized wrench Do not install by twisting the instrument into the pipe fittings b Do NOT install holding the device housing to provide counter torgue to the pipe fitting C d e 11 PSR PS Use an appropiate amount of PTFE tape on male threads of fitting This reduces the twisting stresses produced by tightening the fittings into each other Do not use pliers or wrenches on the housing as this may damage it Do not overtighten as this may fracture the fittings During operation there are a number of situations to avoid a The sudden cessation of fluid flow causes what is typically referred to as water hammer Most people
4. 13 PSR PS Rev 3 13 10 KOBOLD manufactures a wide range of process sensors and technolgies While each of these technologies are designed to operate in a wide variety of applications it is the user s responsibilty to select a technology that is appropiate for the application to install it properly to perform tests of the installed system and to maintain all components The failure to do so could result in property damage or serious injury Inspect instrument for damage upon arrival Cracked fractured bent or otherwise damaged instruments must not be put into use since the device is weakened to an unknown extent The opeartions and installation guide will explain how to make a claim on damaged instruments Make sure that the model which you have selected is chemically compatible with the application liguids While the meter is liguid and spray resistant when installed properly it is not to be immersed Under NO circumstances must the maximum tolerances temperature and pressure be exceeded The maximum tolerances of the device have been determined using water air and or oil If using other media especially corrosive ones it is critically important that the user determine chemical compatibility with our instruments A list detailing material composition of our instruments is available from KOBOLD Instruments Inc upon reguest KOBOLD Instruments Inc cannot accept responsibilty for failure and conseguences resulting from
5. 5 PSR5205 197 039 315 106 148 ve 5006505200 197 039 315 1 118 am PSROUSPSR5215 197 039 315 1 118 PSRS120PSR5220 205 059 321 12 118 34 PSRS125 PSRA225 22 059 331 154 18 T PSRS132PSRS232 26 35 fer 118 Psrs1doPsR 240 26 362 236 118 Diagram 2 5 Pressure Loss vs Flow Rate TITT TT V g 1200 mbar 1000 Pressure Drop The pressure drop of the flow switch is mostly due to the size of the paddle and resulting resistance to flow The data given in the diagram is valid for units with the standard set point ranges The pressure drop is less for units with the special set point ranges in the table The set point ranges are those over which the contact can be adjusted The high grade stainless spring steel beam enables actual flow rates to be significantly higher without causing damage There would however be a higher pressure drop 500 sl Wl UI LAW TT Wr 100 200 L min 50 20 Rev 3 13 5 PSR PS 3 0 Installation Instructions CAUTION For Safety reasons please read the cautionary information located at the end of the manual before attempting installation The PSR PS is installed directly in the pipeline The PSR PS is supplied with NPT or BSP threads Use of PTFE tape is recommended to aid installation
6. KOBOLD PSR PS FLOW SWITCH User Instructions OBOLD KOBOLD Instruments Inc 1801 Parkway View Drive Pittsburgh PA 15205 Phone 412 788 2830 Fax 412 788 4890 www koboldusa com Manual PSR PS 3 13 1 0 2 0 3 0 3 1 4 0 4 1 5 0 6 0 7 0 Diagram 2 4 Diagram 2 5 Diagram 4 2 Table 2 1 Table 2 2 Table 2 3a amp b Table 3 2 Table Of Contents KOBOLD PSR PS FLOW SWITCH General Ge Gea a AU e a Specifications nw GA ddu G ka l i dydd Installation Tauseef e rnt nnn nenne Contact POLE CON aa die Operation Y Y GAGA Adjusting Setpoint 2 0 c ccceneceneenedeneeeeeseseeeneeeees Maintenance aad A dk ie Ad di Al bi Damaged A O Need Help with your PSR PS slot LIST of DIAGRAMS Diagram of Dimensions Diagram of Pressure loss vs Flow rate Diagram of Reed Contact ee cece eeeeeeeeeeteteeeeeeees LIST of TABLES Table of Technical Data Table of Construction is ii ia ko ieeoineedn Table of Switching Ranges Table Reed Contact Data ss nenennnnzznnennznzz PSR PS Rev 3 13 1 PSR PS KOBOLD PSR PS FLOW SWITCH User Instructions CAUTION For safety reasons please read the cautionary information located at the end of the manual before attempting installation 1 0 General The KOBOLD PSR PS flow switch is intended for applications in which an electrical switching function is required once a specific flow is achi
7. are famailar with this phenomenon from their home experience it is the cause behind the loud clank of water pipes which occurs when faucets are turned off too suddenly The cause behind this water hammer is guite easy to visualize Water is fairly massive The amount of water in long runs of pipe is guite substantial When the faucets are turned off suddenly especially from a full on condition the water has considerable momentum and does not want to stop flowing The situation is similar to stopping a car by running into a wall rather than by applying brakes Both are sudden rather than gradual The damage to the wall can be substantial not to mention the car The water hammer causes surges in fluid pressure which could cause the measurement instrument s pressure limit to be exceeded resulting in failure and possible personal injury Fluid surges as well as the water hammer can be particularly damaging to empty flow meters since there is no back pressure in the device The damage is caused once again by momentary excess pressure To avoid these surges fluid lines should remain full if possible and water flow should be introduced to the device slowly If the instrument is isolated with inlet and outlet valves the flow meter must be completely drained when said valves are both closed Failure to do so could result in damage to the device caused bt thermal expansion of fluid Freezing of water in the instrument m
8. eved The PSR PS can be set to operate as either a normally open N O or normally closed N C switch Switching is done with a reed contact which is electrically isolated from the flowing medium The device operates through use of a paddle spring arrangement The flowing medium exerts force on the lower part of the paddle in the T piece The paddle pivots about a point higher in the PSR PS body but is resisted by a leaf spring On the upper part of the paddle is a magnet which moves as the paddle pivots about its center A reed switch is located outside the PSR PS housing thus hermetically isolated inside a movable plastic housing As the magnet nears the reed switch the switch closes By moving the reed switch the flow reguired to close it is altered The result is a flow sensitive reed switch with adjustable switch point 2 0 Specifications Table 2 1 Technical Data Operating Principle Spring resisted paddle Dimensions See Diagram 2 4 Ranges See Diagram 2 3a amp 2 3b Maximum Pressure Most Brass SS units 1450 PSIG 100 Bar NOTE PSR 5132 amp PSR 5140 360 PSIG 25 Bar Maximum Medium Temperature 230 Degrees F 110 Degrees C Maximum Ambient Temperature 150 Degrees F 65 Degrees C Reed Switch Specifications See Table 3 2 Rev 3 13 PSR PS Rev 3 13 Table 2 2 Construction Housing Brass SS 1 4 6 Impact Plate 304 SS 304 SS 3 1 Leaf Spring 301 SS 301 SS 3 4 Leve
9. ide the switch assembly back into the housing until the contact functions as desired If switch is removed note that the arrow points face opposite to the normal flow direction 5 0 Maintenance Due to the simple construction of the PSR PS it is nearly maintenance free Should cleaning ever be required simply release pressure in your system loosen the lock nut Diagram 2 2 Item 6 on the PSR PS and pull the body straight up Clean as necessary and replace During replacement note that the pivot plate of the balance arm Item 3 2 is keyed to the T piece Item 1 The instrument must be reassembled with the keys properly aligned in order to function properly 6 0 Arrival of Damaged Equipment Your instrument was inspected prior to shipment and found to be defect free If damage is visible on the unit we advise that you carefully inspect the packing in which it was delivered If damage is visible notify your local carrier at once since the carrier is liable for a replacement under these circumstances If your claim is refused please contact KOBOLD Instruments for further advisement 7 0 Need help with your PSR PS Call one of our friendly engineers at 412 788 2830 Rev 3 13 9 PSR PS Caution PLEASE READ THE FOLLOWING GENERAL FLOW METER MONITOR WARNINGS BEFORE ATTEMPTING INSTALLATION OF YOUR NEW DEVICE FAILURE TO HEED THE INFORMATION HEREIN MAY RESULT IN EOUIPMENT FAILURE AND POSSIBLE SUBSEOUENT PERSONAL INJURY Rev 3
10. r 3 2 301 SS 301 SS Locking Plate Brass Brass 5 Housing 7 Polyamide Polyamide GFR GFR Cabling 8 PVC PVC O Ring 2 Buna N FKM Magnet 3 3 Ceramic Ceramic GFR Glass Fiber Reinforced Table 2 3a Switching Ranges PSR PSR PS Stand Stand switching ranges Flow switch model PSR Conn Increasing Decreasing NPT GPM Water GPM Water Brass SS 1 4 0 9 1 3 0 6 1 2 PSR 5105 PSR 5205 3 8 1 0 1 6 0 7 1 5 PSR 5110 PSR 5210 1 2 1 3 2 1 1 0 2 0 PSR 5115 PSR 5215 3 4 3 0 4 0 2 2 3 0 PSR 5120 PSR 5220 T 3 2 5 0 2 4 4 5 PSR 5125 PSR 5225 11 4 4 9 8 5 3 8 7 8 PSR 5132 PSR 5232 11 2 9 2 15 0 7 9 14 3 PSR5140 PSR 5240 Table 2 3b Switching Ranges PS Pi Stand switching ranges Stand Flow switch Model PS ipe Size Increasing Decreasing conn Material GPM Water GPM Water NPT Brass SS a 18 24 16 22 1 2 n ae V2 PS 5149 PS 5249 4 84 106 79 101 1 2 6 185 242 176 237 1 2 2 13 16 11 15 1 2 a ii ar Ve Ps 5152 PS 5252 A 57 70 53 66 1 2 6 147 159 137 156 1 2 4 24 30 19 27 1 2 6 53 75 44 62 1 2 PS 5114 PS 5214 8 101 141 88 123 1 2 Rev 3 13 PSR PS 4 Diagram 2 4 Dimensions PSR PS PS PSR Uimensions inches lae c o ia noe Wen PSS1ASPS5219 386 232 134 078 os vz SRS10
11. ust be avoided since the resultant expansion will damage the flow meter and make it unsafe for use Design a fail safe system a Design a fail safe system that accomodates the possibilty of switch or power failure In critical applications KOBOLD recommends the use of redundant backup systems and alarms in addition to the primary system Rev 3 13
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