capsu-photohelic® pressure switch/gage
Contents
1. A 47 DIA FLANGE 7 3 Pr _ J 50 HOUSING T eo a so H N 4 Series 43000 CAPSU Photohelic Switch Gage The CAPSU Photohelic Switch Gage is a most versa tile precise pressure switch combined with the CAP SUHELIC pressure gage Available with one or two photo transistor actuated relays Gage reading is unaffected by switch operation Easy to adjust set points with knob con trols Applied pressure and switch set points are fully visible at all times Dead band is one pointer width less than 1 of full scale Double pole double throw relays can be easily interlocked to provide variable deadband control For posi tive negative or differential pressures as low as 0 to 5 water column and as high as 0 to 6000 psig full scale set points as low as 01 WC on 5 scale unit PHOTOHELIC SENSING HOW IT WORKS In a typical control application the CAPSU PHOTOHELIC Switch gage controls between high and low pressure set points When pressure changes reaching either set point pressure the beam from an LED to the limiting phototran sistor will be cut off by the helix driven light shield The resulting signal change Is electronically amplified to actuate its DPDT slave relay and switching occurs Dead band between make and break 1 of full scale or less just enough to assure positive chatter free operation Patent Nos 4 011 759 4 030 365 DWYER INSTRUMENTS INC P O Box 373 Michi2. Position The CAPSU PHOTOHELIC may be mounted as an integral package or the amplifier load relay assembly and housing may be mounted remotely from the indicating gage phototransistor unit Extension cords with 7 pin plugs and receptacles are available from Dwyer for interconnec tion of the two units All standard units are calibrated for use with the diaphragm and scale in a vertical position Special factory calibration is available for applications requiring inclined or horizontal positions The exceptions are ranges under 5 inches W C which are only available for vertical installation 3 Mounting The CAPSU PHOTOHELIC is normally mounted before making electrical connections as the elec trical enclosure is independent of the mounting means and may be removed at any time A Panel Mounting Normal mounting is flush or through panel as shown in Fig 2 Be sure to allow 4 3 8 extra space behind the unit for electrical enclosure removal Make a sin gle 4 13 16 diameter hole in the panel Insert the entire CAPSU PHOTOHELIC unit from the front then slip on the mounting ring and snap ring from the rear Seat the snap ring in its groove back up the mounting ring against snap ring and tighten the four 4 1 1 4 No 6 32 clamp screws provided If behind panel space is critical the amplifier relay unit can be mounted remotely See the Remote Relay Mounting Instructions for details For convenience this hole can be made with Model
3. GAGE MODELS AND RANGES Range Zero Minor Minor Model Center Minor Model Div Model Range Div Number Div Number MM Number Pascals Pascals Inches of 43000 20 MM 43000 25 MM 43000 50 MM 43000 80 MM 43000 100 MM Range Zero Minor Model Center Div Number Pascals Pascals 43300 500 Pa 250 0 250 Minor Model Range Div Number PSIG PSIG Model 43201 Minor Number Kilopascals Kilopascals Model Div 43202 Number 43203 43204 43000 15 CM 43205 43000 20 CM 43210 43000 25 CM 43215 43000 40 CM 43220 43000 50 CM 4323058 43000 80 CM 43240S 43000 100 CM 43260S 43000 150 CM 432805 43000 200 CM 43210S 43000 250 CM 432205 43000 300 CM 4323058 43600S 43600S Minor 436015 Model Div Model 436025 Number CM Number 436045 43606S 43300 4 CM 02 43300 10 CM 10 43300 30 CM Note The CAPSU Photohelic pressure switch gage may be used in an Underwriters Laboratories approved indus trial control panel if the usage conforms to U L specifica tions for the acceptance of unlisted components CAPSU Photohelic Switch Gage SERIES NO 43000 EXPLODED VIEW S Figure 10 1 Capsu Photohelic Gage Body amp Sensor Assembly 10 Flange Plate and Bracket Assembly for Circuit Board 2 Cover Knob and Zero Adjust Assembly with Mounting Screws 3 O Ring Seal for Cover 11 Lock Washer 4 Bezel with Groove for Snap Ring 12 1 8 NPT Mounting Nut 5 Mounting Ring 13 Amplif
4. loss of that pressure would allow the black pointer to return to the center and thus cause the low set point relay to energize If the LED should fail only the left low relay will de energize The right high relay will react as if pressure were above its set point and will remain energized even though pressure might be below that setting In this situation only termination only termination of electrical power will allow the right high relay to de energize MAINTENANCE AND SERVICE Dwyer CAPSU PHOTOHELIC Switch Gages are precision instruments expertly assembled and calibrated at the fac tory They require no lubrication or periodic servicing If the interior is protected from dust dirt corrosive gases and flu ids years of trouble free service may be expected Zero adjustment should be checked and reset occasionally to maintain accuracy Any repairs necessary to either the Dwyer Capsuhelic pressure gage or the electronic compo nents should be performed by a trained instrument mechanic In most cases this is best accomplished by returning the complete CAPSU PHOTOHELIC Switch Gage to the Dwyer factory Model Number 43000 0 43001 43002 43003 43004 43005 43006 43008 43010 43015 43020 43025 43030 43040 43050 43060 43080 43100 43150 43200 43300 43400 43500 Range Inches of Water Minor Div SERIES 43000 CAPSU PHOTOHELIC PRESSURE SWITCH
5. must be made with both high and low taps vented to atmosphere Make pressure connections to the 1 4 NPT female taps using adapters appropriate for the type of tubing being used 1 4 0 D or larger copper or stainless steel is recom mended Either of the duplicate sets may be used but nor mally the upper set is preferred for air or gases and the lower for liquids This allows condensate to be periodically drained out the bottom on gas service and trapped air to be purged out the top on liquid service Optional A 314 Bleed Fittings simplify either operation It is especially important that all air be bled from the gage on liquid service to assure accurate readings For differential pressures use both high and low taps and plug the unused pair For positive pressure use either high tap plug the other and leave the high side vented to atmos phere Two 1 4 NPT pipe plugs are furnished with each Statement NOTE If the Photohelic switch gage is over pressured pointer may jump from full scale back to zero and remain there until the excess pressure condition is relieved Users should be aware of possible false zero pressure indications under this conditions ELECTRICAL CONNECTIONS 1 Cover The amplifier relay unit has an easy to remove housing Remove the three 3 screws as shown in Fig 5 and slide the housing off Make all the electrical connections before reinstalling and refastening the housing 2 Conduit Electrical a
6. push button to the circuit as described in paragraph 6 above 11 Single Set Point Special Manual reset after actuation on falling pressure can be obtained by using Circuit Style SRL Consult the factory for special units and detailed instructions regarding their use 12 Placing in Service In normal operation each relay is de energized when the pressure applied to the instrument IS below its set point Special low latching units will ordinar ily have to be reset before placing on the line in normal oper ation Reset Jumpers 1 6 HP 117 Volt Load 117 Volt Line Note For larger motors use the CAPSU Photohelic in a maintained contact 117 Volt Control or Push Button Circuit of the motor starter Figure 9 High Low Limit Control Circuit HH 13 Failure Mode The CAPSU PHOTOHELIC circuit design provides certain protection in the event of a loss of pressure or electrical power In either case both relays will de energize returning to their normal zero pressure state The exceptions to this are models with center zero ranges Because the relays on all standard models are always ener gized when the indicating black pointer is to the right of their respective set points the relay action on loss of pres sure will depend on set point position since either of them could be located to the left of zero As an example if the left pointer were set at 2 in w c and negative pressure was 3 in w c a
7. signal con nections are made to the appropriate terminals in Sections A and D as in paragraph 5 above Connect terminals in Sections B and C through normally closed switches or push buttons as shown in Fig 8 Use of dry circuit type switch es such as Dwyer Part No A 601 with palladium gold etc or rotary wiping action type contacts it recommended Make external ground connections as required and connect power to Section E for the control unit Circuit style LL is used for manual reset applications which require that contact be maintained following pressure decrease below the set point Load connections are made to the appropriate terminals in Sections A and D A normal ly open type manual reset switch such as Dwyer Part No A 601 is connected to the terminals in sections B and C The circuit must be armed by momentarily closing the Switch while the black pointer is to the right of the set point From that point on the circuit will latch on pressure decrease below the set point and remain latched on pres Sure increase until manually reset with the optional switch CAUTION Do not apply electrical current to terminals in sections B and C Figure 8 Manual Reset with Circuit HH 7 Dual Set Point Automatic and Manual Reset Combinations Circuit style HH may be used with either set point wired and operating as in paragraph 5 above and other set point wired and operating as in paragraph 6 8 High Low Limit Control Dua
8. 59 4 030 365 Figure 7 Circuit Label The letter L denotes a circuit in which the relay can be made to latch or remain de energized after pressure decrease to its set point Two letters are required to fully identify a dual set point unit Thus circuit style HH which is standard is a dual set point circuit which has provisions for latching on pressure increase to either set point Single relay units are identified by the letters SR followed by H for the standard unit or L for the special low latch unit Units for use with other than standard 117 VAC will be so indicated on the label 5 Dual Set Point Automatic Reset Circuit Style HH is used for simple on off switching applications To place in service connect load circuits to the appropriate terminals in Section A Fig 6 for the right set point and Section D for the left set point Note that the N O contacts are open when the gage pressure pointer is to the left of the set point pointers No connections are necessary in Sections B and C Make external ground connections as required and con nect power to Section E for the control unit To use circuit style LL for automatic reset a jumper wire must be installed between the upper and lower terminals in sections B and or Gi 6 Dual Set Point Manual Reset Circuit Style HH may also be used for manual reset applications where it is desired to have maintained contact on either relay following pressure increase above its set point Load or
9. 730E 120 MM chassis punch manufactured by Greenlee Tool Co Contact your machine tool distributer Not available from Dwyer Instruments B Gage Mounting with Relay Package Remote Where it is preferred to install the amplifier relay unit separate from the gage usually due to space limitations the gage may either be panel mounted as in figure 3A For surface mount ing use the hole layout in figure 3B CAUTION When the gage is surface mounted two 1 4 dia holes must be locat ed as shown for blow out protection This assures that if the gage is overpressured thus causing a failure pressure will be safely vented out the back Failure to keep these holes clear could result in personal injury and or property damage since the excessive pressure could be forced into the front cover which would then blow off surface Mounting i id A HOLES FOR BLOC Par l Hole Layout Front Figure 3 C Remote Relays Mounting The amplifier relay unit may be mounted remotely as shown in Fig 4A Use the hole layout as shown in Fig 4B for this option Additional mount ing information for special requirements is available from the factory Remote Av ier Aelay Lint Hole Layoui Figure 4 4 Pressure Connections amp Zeroing After installation but before making pressure connections set the indicating pointer exactly on the zero mark by using the zero adjust screw located near the bottom of the front cover This adjustment
10. AUTION Do not apply electrical current to terminals in sections B and C Figure 6 Mounting Details Section E contains the power connections for the control unit transformer primary The transformer in turn supplies reduced voltage power for the LED phototransistor ampli fier unit and load relay pull in and holding coils Connections must always be made to this section in order to put the unit in operation Standard units are designed to 117 V A C input to the transformer Special units are also available for other voltages Separate Ground Wire attachment is provided for by a No 6 32 screw on the mounting bracket near the conduit opening An additional ground wire connection Is located on the side of the gage body for use when the amplifier relay unit is mounted remotely Single Set Point instruments are furnished with the right or high set point components and circuitry in place These are connected to Sections A and B of the terminal board The left or low set point components are omitted 4 Circuit Style The CAPSU PHOTOHELIC is available with several factory installed optional internal circuits They are identified as to style by a label shown in Fig 7 This label is mounted prominently on the terminal board of each instrument The letter H denotes a circuit in which the relay can be made to latch or remain energized after pressure increase to its set point CAPSU PHOTOHELIC CIRCUIT HH 117 VAC E PATENT 4 011 7
11. ccess to the connection box portion of the relay housing is by bottom opening for 3 4 conduit Use of flexible conduit is recommended It should be sup ported from the panel or other suitable surface to prevent the wiring system from exerting undue strain on the instru ment See Fig 5 Cover Mounting Screws Flexible Condult Support Conduit From Panel Figure 5 Terminal Board 3 Terminal or Connection Board Layout In Fig 6 Terminal Board Section A contains the connections for th load or slave relay acutated by the high or right set point ohototransistor This relay is a double pole double throw type The two top connections are normally closed the two middle connections are normally open and the bottom connections are the common pair The relay is in its normal or De Energized position when pressure is below the right hand set point Section D is exactly the same as Section A except that its load or slave relay is controlled by the low or left set point The De Energized position is below the left hand pointer Set point Section B contains the external connections to the holding coil circuit for the high or right set point relay and Section C contains similar connections for the low or left set point relay The function and use of these connections varies somewhat depending on the circuit style of the instrument See paragraphs 5 and 6 for details Section B Section C Section A Section D Section E C
12. gan City IN 46361 0373 U S A CAPSU PHOTOHELIC PRESSURE SWITCH GAGE Specifications Installation and Operating Instructions _ a s n r _ rs conpun OPENING L V H HOUSING REMOVAL Bulletin B 34 LOW PRESSURE HIGH PRESSURE CONNECTION AIR OR GAS AIR OR GAS i ai a A N p DAA HOLE IN MOUNTING PANEL optional 120me IH f f A tif f i 4 6 M rowhornbn vO X i c a So a N Ye i f if N ii I N D 4 DIA FACE LOW PRESSURE HIGH PRESSURE s i CONNECTION CONNECTION TTi LIQUID seer al UQUID Figure 1 SPECIFICATIONS 1 Dimensions 5 Diameter x 9 3 16 Length 2 Weight 6 Lbs 4 oz 10 Lbs 6 oz Brass Case 3 Bezel Size 5 0 D x 4 I D across gage face 4 Panel Mounting 4 13 16 Dia Hole required Maximum panel thickness 5 8 5 Pressure Connections 1 4 NPT female duplicate sets on top and bottom 436000S Models single 1 8 NPT female on top 6 Gage Finish Baked Gray Epoxy Hammerloid 7 Pressure Rating 20 Hg vacuum To 500 PSIG 436000S models 1 2 x full scale pressure 8 Ambient Temperature Range 20 F To 120 F 9 Standard Accessories Two 2 1 4 NPT pipe plugs snap ring mounting ring Four 4 6 32 x 1 1 4 mounting SCrews 10 Load Relays DPDT for each set point Rated for 10 Amps resis
13. ier Relay Circuit Assembly 6 Snap Ring Mounting 14 Gasket for Housing 7 Screws for Mounting Ring 6 32 x 1 1 4 RHMS 4 15 Housing for Amplifier Relay Unit with 3 6 32 x 5 16 Required RH Machine Screws 8 Optional A 314 Bleed Fitting 1 4 NPT 16 1 4 NPT Pipe Plugs Not Shown 9 1 8 NPT Mounting Stud When corresponding with the factory regarding CAPSU Photohelic switch gage problems refer to the call out numbers in this view Be sure to include range single or double circuit style letters where required Field repair is not recommended contact the factory for service information Printed in U S A 6 93 FR 16 440405 00 DWYER INSTRUMENTS INC Phone 219 879 8000 www dwyer inst com P O Box 373 Michigan City IN 46361 0373 U S A Fax 219 872 9057 e mail info dwyer inst com
14. l Set Point Circuit Style HH may be used to control fans dampers pumps etc between the set points of a CAPSU PHOTOHELIC To accomplish this use one set point relay to reset the other as shown in the wiring diagram Fig 9 In this typical appli cation the load for instance a fan would be connected to the N C contacts of the right set point relay Section A Fig 6 On pressure rise to the right set point its relay would pull in and hold even though pressure might then fall below that set point If the pressure continued to fall to the left set point its relay would automatically be DE ENERGIZED return to its normal position and in so doing open the hold ing coil circuit from Section B Fig 6 The right set point relay would thus be reset and the cycle could repeat 9 Dual Set Point Special Purpose Circuits Circuit Style LL may be used where manual reset following maintained contact on pressure decrease to either set point is desired Circuit Styles HL and LH are combination units For special combinations of features special units and detailed instructions regarding their use consult the factory 10 Single Set Point PHOTOHELIC The single set point CAPSU PHOTOHELIC is furnished with the right set point only Terminals in Section A and B Fig 6 are connected to this relay Circuit Style SRH is wired for automatic reset as in paragraph 5 above Manual reset is accomplished by adding a normally closed reset switch or
15. tive at 117 V A C 50 60 Hz 11 Power Required 117 V A C 50 60 Hz 5 Watts aver age Optional 220 V or 240 V units available 12 Conduit Opening 3 4 13 Accuracy 3 of full scale except 2 on 43000S amp 436000S Models 4 on 43215 43220 amp 43500 14 Service Compatible gases or liquids For water or water based liquids use only series 43000B models with brass case DO NOT use with hydrogen gas due to adverse reac tion with rare earth magnet Phone 219 879 8000 Fax 219 872 9057 www dwyer inst com e mail info dwyer inst com Figure 2 Through Panel Mounting INSTALLATION 1 Location All parts of the Dwyer CAPSU PHOTOHELIC pressure switch gage are ruggedly constructed and will stand a moderate amount of vibration physical shock and handling Normal care in handling and installation is all that Is required In cases where instrument panel vibration is severe the panel should be spring mounted or the amplifi er relay unit mounted remotely on a more stable surface Select a location where the ambient temperature will not exceed 120 F Pneumatic pressure sensing lines may be run any necessary distance For example 250 foot sensing lines will not affect accuracy but will damp the reading Slightly Do not restrict lines If pulsating pressure or vibra tion causes excessive pointer oscillation or relay chatter consult factory for additional damping means See acces sory Bulletin S 101 for fittings 2
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