Series 3000MR Photohelic®Differential Pressure Switch/GageSpecifications — Installation and Operating InstructionsBulletin E-70DWYER INSTRUMENTS, INC. Phone: 219/879-8000www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057e-mail: info@dwyer-inst.com.2O.4O.60.80INCHES OF WATER1/8 FEMALE NPT HIGHPRESSURE CONNECTION1/8 FEMALE NPT HIGHPRESSURE CONNECTION2-1/61[52.39]2[50.80](4) 6-32 HOLESEQUALLY SPACED ON A5-1/8 [130.18] B.C.1-1/4[31.75]Ø4-47/64[120.25]Ø5[127.00]Ø4 [101.60]FACE5-1/2 [139.70] O.D.MOUNTING RING5/8[15.88]1/8 FEMALE NPT LOWPRESSURE CONNECTION5/8 [15.88]PANEL MAX3/16[4.76]2-1/2[63.50]ELECTRICAL CONNECTIONSCAUTION: Do not exceed specified electrical ratings. Permanent damage notcovered by warranty will result. This unit is not designed for AC line voltage operation.Electrical connections are made by means of the cable assembly supplied whichhas a multi-pin female plug installed on one end which mates with the male con-nector on the rear of the gage. Wire leads on the opposite end of the assembly areconnected in accordance with the drawing and chart to the right.Note:An R/C (resistor/capicitator) snubber is required when switching inductiveloads such as a solenoid or contactor. specify Dwyer Instruments, Inc. part numberA-600. For DC circuits, also include a 1N4005 diode.Using solid state technology, the Series 3000MR Photohelic®switch/gage com-bines the functions of a precise, highly repeatable differential pressure switch witha large easy-to-read analog pressure gage employing the durable, time-provenMagnehelic®gage design. Switch setting is easy to adjust with large externalknobs on the gage face. Gage reading is unaffected by switch operation — willindicate accurately even if power is interrupted. Solid state design now results ingreatly reduced size and weight. Units can be flush mounted in 4 13/1˝ (122 mm)hole or surface mounted with hardware supplied. 3000MR models employ versa-tile electromechanical relays with gold over silver contacts — ideal for dry circuits.All models provide both low and high limit control and include 18-inch (45 cm)cable assemblies for electrical connections.Gage accuracy is ±2% of full scale and switch repeatability is ±1%. Switch dead-band is one pointer width — less than 1% of full scale. Compatible with air andother non-combustible, non-corrosive gases, they can be used in systems withpressures to 25 psig (1.725 bar). Optional construction is available for use toeither 35 psig (2.42 bar) or 80 psig (5.51 bar). AccessoriesMounting ring, snap ring(4) 6-32 x 1-1/4˝ RH machine screws18˝ (45 cm) cable assembly(panel mounting)(2) 3/16˝ tubing to 1/8˝ NPT adapters(3) 6-32 x 5/16˝ RH machine screws (2) 1/8˝ NPT pipe plugs (surface mounting)SPECIFICATIONSGAGE SPECIFICATIONSService: Air and non-combustible, compatible gases.Wetted Materials:Consult Factory.Accuracy: ±2% of full scale (3000-0 ±3% of full scale).Pressure Limit:-20˝ Hg. to 25 psig (-0.677 bar to 1.72 bar). MP option; 35 psig(2.41 bar), HP option; 80 psig (5.52 bar).Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C).Process Connections: 1/8 female NPT (duplicated side and back).Size: 4˝ (101.6 mm) dial face, 5˝ (127mm) O.D. x 3-1/8˝ (79.38 mm); For -SSBezel: 4-3/4˝ (120.7 mm) O.D. x 2-21/32˝ (67.5mm).Weight: 1.8 Ib., (816 g).SWITCH SPECIFICATIONS 3000MRSwitch Type: Each setpoint has 1 Form C relay (SPDT).Relay Contacts: (resistive load) 1 Form C rated 1.0 amp @ 30 VDC, 0.3 amp @110 VDC or 0.5 amp @ 125 VAC. Gold over clad silver - suitable for dry circuits.Electrical Connections:18˝ (46 cm) cable assembly with 8 conductors. Optionallengths to 100´ (30.5 m).Power Requirements: 24 VDC, regulated ± 10%.Mounting Orientation: Diaphragm in vertical position. Consult factory for otherposition orientations.Set Point Adjustment: Adjustable knobs on face.LETTERAECBDHJFCOLORRedBlackBrownVioletBlueGreenWhiteOrangePowerSupplyLow Set PointHighSet Point+-COMNCNOCOMNCNOINSTALLATION1. LOCATION:Select a location where the temperature of the unit will bebetween 20°F and 120°F (-6.67 to 48.9°C). The tubing feeding pressure to theinstrument can be run practically any length required but long lengths willincrease response time slightly. Avoid surfaces with excessive vibration. 2. POSITION:All standard models are calibrated with the diaphragm vertical andshould be used in that position for maximum accuracy. If your applicationrequires mounting in other than a vertical position, be sure to specify this whenordering. 3. PRESSURE CONNECTIONS:For convenience, two sets of 1/8˝ female NPTports are available. Plug the unused set with pipe plugs provided. Attach tub-ing from positive pressure source to port marked “HI” or from negative(Vacuum) source to port marked “LOW”. In either case, opposite port must bevented to atmosphere. In dusty environments, we recommend use of an A-331Filter Vent Plug to keep interior of instrument clean. For differential pressuresthe higher source is connected to the “HI” port and lower to the “LOW” port.4. MOUNTING:The Photohelic®Switch/Gage may be either panel mounted orsurface mounted.A. PANEL MOUNTING:Cut a 4-3/4˝ or 120mm dia. hole in panel and insert thecomplete unit from the front. Slip on the mounting ring and install the splitsnap ring in the groove on the bezel. Seat the mounting ring against the snapring and thread the four screws through the tapped holes. Tighten screwsagainst rear of panel.B. SURFACE MOUNTING:Drill (3) 3/16˝ dia. holes for mounting screws and (1)7/8˝ dia. hole for wire assembly as shown in hole location drawing. Insertscrews from rear of panel and thread into tapped holes on back of Photohelic®Switch/Gage case. If rear pressure connections are to be used, make 1/2˝dia. holes located as shown in hole location drawing in left column. C. FOR -SS BEZEL INSTALLATION:Provide a 4-9/16˝ opening in panel. Insert gage and secure with supplied mounting hardware.Once Photohelic®Switch/Gage unit is securely mounted, plug wire assembly into 9pin connector on rear of unit, being careful to match pin locations. 5. ZEROING:Once the Photohelic®Switch/Gage is mounted in its final position,check to be sure pointer aligns with zero on scale, when no pressure isapplied and both low and high pressure ports are vented to atmosphere. Toadjust, turn small slotted screw at center-bottom of gage face.MAINTENANCEUpon final installation of the Dwyer®Photohelic®Switch/Gage, no routing mainte-nance is required. A periodic check of system calibration is recommended.The Series 3000MR Photohelic®Differential Pressure Switch/Gage is not field ser-viceable and should be returned if repair is needed (field repair should not beattempted and may void warranty). Be sure to include a brief description of theproblem plus any relevant application notes. Contact customer service to receivea return goods authorization number before shipping.Ø4-3/4 [120.65] HOLESNAP RINGGROOVEPNEUMATICPRESSURE TAPSØ7/8 [22.23] HOLE INPANEL FOR WIRECONNECTION1-1/8[28.58]1-1/8[28.58]11/16[17.46]Ø1/2 [12.70] HOLE FOHIGH PRESSURE CONNECTIO1-3/4[44.45]1/2[12.70](3) Ø3/16 [4.77] EQUALLY SPACED ON4-1/8 [104.78] Ø1/2 [12.70] HOLE FORLOW PRESSURE CONNECTIONDWYER INSTRUMENTS, INC. Phone: 219/879-8000www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057e-mail: info@dwyer-inst.com©Copyright 2017 Dwyer Instruments, Inc.Printed in U.S.A. 6/17FR# 440622-00 Rev. 6Next >