Series aDpS Differential pressure SwitchSpecifications - installation and operating instructionsBulletin e-80-aDpSthe Series aDpS adjustable Differential pressure Switch is designed foroverpressure, vacuum, and differential pressure applications. The scaledadjustment knob allows changes to the switching pressure to be made without apressure gage. The ADPS is available with settings from 0.08˝ w.c. (20 Pa) to 20˝w.c. (5000 Pa). The silicone diaphragm and PA 6.6 body make the Series ADPSperfect for use with air and other noncombustible gases. The Series ADPS can beused in monitoring air filters, ventilators, and industrial cooling-air circuits alongwith controlling air and fire-protection flaps and many other applications.Use only with mediums such as air, or other noncombustible or non-aggressivegases. Otherwise operating faults or accidents may occur.Mounting SwitchFirst check the pressure switch to ascertain whether any damage is visible on thehousing. If the housing is leaky because of damage, the pressure switch must notbe used.Switching pressure specifications apply to vertical installation which is also therecommended position with pressure connections pointing downwards. Only if there is no potential for condensate forming can you mount the pressureswitch horizontally. In this case, however, the switching values are approximately0.08 in w.c. (20 Pa) higher as indicated on the scale. In the horizontal position, thepressure switch should be mounted ‘lying down’ only (that is to say with theelectrical connections pointing upwards). Do not mount the pressure switch in ahanging position (that is to say, not ‘overhead’ with the electrical connectionspointing downwards). Otherwise the device will function inaccurately. a) Mounting with screws or brackets 1. To mount the pressure switch, L-shaped A-288 and S-shaped A-289 mounting brackets can be ordered separately. To secure the device on the rear side of the housing, only use the sheet metal screws (3.5 x 8 mm) which are supplied together with the mounting brackets. Under no circumstances must you use longer screws. Otherwise, the base of the housing could be punctured resulting in the pressure switch leaking.2. You can also mount the pressure switch directly on a wall. To do this use screws with a maximum diameter of 0.315˝ (8.0 mm), if you use the outer mounting lugs to screw the device in place. Do not tighten the screws so much that the base of the device is deformed. Otherwise, the pressure switch can be shifted out of position, or leak.installing Hosesimportant:Pressure tubing cannot be kinked. Pay particular attention to this pointif you run hoses over an edge. It is better to form a loop. If the hoses are kinked,the device cannot function accurately.a)For connection to the pressure switch two fittings inherent in the housing areprovided for hoses with an internal diameter of 1/4˝ (6.0 mm).1. Connect a hose with the higher pressure to socket P1 which is located on the lower section of the housing.2. Connect a hose with the lower pressure to socket P2 which is located on the middle section of the housing.After you have installed the hoses, it is absolutely essential to check them fortightness of fit at the connection points and to make sure that they run without anykinks. DWYeR inStRUMentS, inc. phone: 219/879-8000www.dwyer-inst.comp.o. BoX 373 • MicHiGan citY, inDiana 46360, U.S.a. fax: 219/872-9057e-mail: info@dwyermail.comSpecificationSService: Air and noncombustible, compatible gases.Wetted Materials: Diaphragm material: Silicone; Housing material & switch body:POM and PA 6.6; Cover: Polystyrene.temperature Limits: Process ambient temperature from -4 to 185˚F (-20 to 85˚C). pressure Limits: Max. Operating Pressure: 40” W.C. (10 kPa) for all pressureranges.Switch type: Single-pole double-throw (SPDT).Repeatability: ±15% FS.electrical Rating: Standard: Max., 1.5A/250 VAC, max. switching rate: 6cycles/min.; Gold Contact Option: 0.1 A/ 24 VDC.electrical connections: Push-on screw terminals. M20x1.5 with cable strainrelief or optional 1/2˝ NPT connection.process connections: 5/16˝ (7.94 mm) outside diameter tubing, 1/4˝ (6.0 mm)inside diameter tubing. Mounting orientation: Vertically, with pressure connections pointing downwards.Mechanical Working Life: Over 106switching operations. Weight: 5.6 oz (160 g).enclosure Rating: IP54.agency approvals: CE, RoHS.Ø11/64[Ø4.5]21/64[8.5]2-17/64[57.5]7/8[22]2-21/64[59]19/64[7.5]51/64[18]-(P2)+(P1)Ø15/64[Ø6]2-9/16[65]1-31/32[50]electrical connectionWork on electrical installations must only be carried out by electricians who arespecifically trained for this purpose. First make sure that there is no voltage on the connecting cablewhile you are working on the electrical connections. Otherwise,a possible electric shock may result and the connected equipment may bedamaged. The connecting cable can be run to the pressure switch from threesides, according to choice. The screw cable connection has a plug-in design forthis purpose. Rotate protective cover accordingly.For cable gland models, the seal in the screw cable connection is designed forcables with alternative sheath diameters of 0.275˝ (7 mm) or 0.393˝ (10 mm). Onlyuse these sizes – otherwise the screw cable connection cannot seal adequately.1.If using a 0.275˝ (7 mm) connecting cable, you can line up the press nut, the plain washer and the sealing ring directly on the cable.2. If using a 0.393˝ (10 mm) connecting cable, you must first break the inner rubber ring out of the sealing ring directly on the cable. Then line up the press nut, the plain washer and the sealing ring on the cable.WiringThe switching device in this pressure switch is designed as a change-over contactas can be seen from the wiring diagram (Figure 1). The rest position is shown inFigure 1 (pressure below the activation switch point on dial).1. In the instance where pole 3 (COM) closes to Pole 2, the pressure is increasing (NO).2. In the instance where pole 3 (COM) closes to Pole 1, the pressure is decreasing (NC).Protect the feed line (to pole 3) by fuse, either in control system or along the line,and do so with: 1.Max. 1.5 A / 250 VAC, if you are loading the contact with an resistive load;2. Max 0.4 A / 250 VAC, if you are loading the contact with an inductive load (such as relay);3. Max. 0.1 A / 24 VDC, if you are using the pressure switch in the weak current version with gold-plated contacts.The connections are intended for crimp-type sockets, 0.25 in (6.3 mm).1. Make sure the crimp connection is perfect, and that the cable lugs fit properly on to the connections.2. If you do not have any crimp-type sockets available, you can also use the cable lugs which are supplied with mounted screw terminals. However, these are only intended for rigid copper wire.3. On flex, it is either necessary to crimp on strand end sleeves – and then you can also screw the strands on – or to crimp cable lugs on directly as previously described.©Copyright 2014 Dwyer Instruments, Inc.Printed in U.S.A. 6/14FR# R1-443602-00 Rev. 2Setting the pressure RangeMake absolutely certain that there is no voltage on the electrical connectionsbefore you carry out any setting on the pressure switch. Otherwise, it could be fatalif you accidentally touch the electrical connections or the metal adjusting screwwhile you are performing the settings.a)Use the adjustment dial to set the pressure which should trip the switch on anincrease of pressure.1. The indications on the dial are only correct for the vertical mounting position.2. When the pressure falls, the switch returns to its resting position as soon as the pressure falls below the dead band.attaching covera)Insert the screw cable connection into the recess provided for this purpose onthe housing.b)Then place the housing cover in position and screw it down evenly on to thepressure switch.testing the SettingDo not operate the system until the housing is closed. Otherwise there is thepossibility of an electric shock if you accidentally touch live parts.Check the trip and reset pressures by slowly increasing the pressure and thenallowing it to fall again.iMpoRtant:Observe the maximum permissible operating pressure of 40˝ w.c.(10 kPa) which is indicated in the data sheet. Otherwise the pressure switch maybe damaged.MaintenanceUpon final installation of the Series ADPS Adjustable Differential Pressure Switch,no routine maintenance is required. A periodic check of system operation isrecommended. The Series ADPS is not field serviceable and should be returned ifrepair is needed (field repair should not be attempted and may void warranty). Besure to include a brief description of the problem plus any relevant applicationnotes. Contact customer service to receive a return goods authorization numberbefore shipping.DWYeR inStRUMentS, inc. phone: 219/879-8000www.dwyer-inst.comp.o. BoX 373 • MicHiGan citY, inDiana 46360, U.S.a. fax: 219/872-9057e-mail: info@dwyermail.comcaUtion1232 NO1 NCP3 COMfigure 11. Break Contact2. Operating Contact3. Power Supply LineNext >