Grundfos DMH 28 Series Installation And Operating Instructions Manual
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Grundfos DMH 28 Series Installation And Operating Instructions Manual

Grundfos DMH 28 Series Installation And Operating Instructions Manual

Dosing pump
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DMH 28X
Dosing pump
Installation and operating instructions
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GRUNDFOS INSTRUCTIONS

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  • Page 1 GRUNDFOS INSTRUCTIONS DMH 28X Dosing pump Installation and operating instructions Further languages http://net.grundfos.com/qr/i/99558950...

  • Page 2: Table Of Contents

    Diaphragm controller (optional) approved, are considered improper and are not Connecting the power supply cable permitted. Grundfos accepts no liability for any Start-up/shutdown damage resulting from incorrect use. Initial start-up/subsequent start-up Start-up/subsequent start-up of DMH 280...

  • Page 3: Safety

    If the safety instructions are not observed, all rights to claims for Grundfos! damages may be lost. Repairs must only be carried out by authorised and...

  • Page 4: Unauthorised Modification And Manufacture Of Spare Parts

    Using other parts can result in liability for any resulting consequences. 2.8 Improper operating methods Grundfos Water Treatment GmbH - Reetzstr. 85 - D - 76327 Pfinztal XXX XX-XX X-XXX/X/X-X-XXXXXXXXXXX The operational safety of the supplied pump is only ensured if it is...
  • Page 5 DMH 55-100D B-SS/V/SS-X-E2A1A1XEMAG Valve type (inlet/outlet) Aluminium Grey cast iron DMH 55-100D B-SS/V/SS-X-E2A1A1XEMAG Standard valves, not spring-loaded Pump design Spring-loaded inlet and outlet valve (0.05 bar) DMH 55-100D B-SS/V/SS-X-E2A1A1XEMAG Spring-loaded inlet valve (0.05 bar) and outlet valve (0.8 bar) Grundfos Neutral...

  • Page 6: Pump Models And Pump Types

    3.2 Pump models and pump types The DMH 28X dosing pump is available for a variety of performance ranges in various sizes. The pump nameplate shows various data of the pump like the type designation and the pump model. For an explanation of the nameplate see section 3.1.1 Nameplate.

  • Page 7: Sound Pressure Level

    3.3.2 Accuracy 3.3.6 Maximum suction lift (continuous operation) for media with maximum permissible viscosity • Dosing flow fluctuation: smaller than ± 1 % within the control range 10-100 % Maximum suction lift • Linearity deviation: ± 1 % of the full scale value. Pump model [m WC] Applies to:...

  • Page 8: Ar Control Unit

    Permissible deviation from rated head deaeration Rated voltage value • memory function (stores a maximum of 65,000 pulses) • two-stage tank-empty signal (e.g. via Grundfos tank empty 230/400 V ± 10 % sensor) 240/415 V ± 10 % • stroke signal/pre-empty signal (adjustable), e.g. as a feedback 115 V ±...

  • Page 9: Dosing Medium

    DMH 285 as contaminated. DMH 286 If Grundfos Water Treatment is requested to service the pump, it DMH 287 must be ensured that the pump is free from substances that can be injurious to health or toxic. If the pump has been used for such DMH 288 substances, the pump must be cleaned before it is returned.

  • Page 10: Product Description And Accessories

    5. Product description and accessories 5.1 General description The hydraulic-driven movement of the PTFE diaphragm (Q) displaces an equivalent volume of dosing medium from the The DMH 28X are positive-displacement pumps with hydraulic dosing head (2) into the dosing line. With the suction stroke, the diaphragm control.
  • Page 11 Fig. 4 DMH 283 Fig. 5 DMH 285, 286, 287...
  • Page 12 Fig. 6 DMH 288 Pos. Components Motor Worm gear Eccentric Return spring (not with drive size 3) Sliding sleeve Piston Crank Combined overpressure and degassing valve Degassing valve Diaphragm protection system (AMS) Dosing diaphragm Dosing head Dosing head deaeration screw Suction valve Discharge valve Stroke-length adjustment knob...
  • Page 13 5.1.1 Combined overpressure and degassing valve Functional principle of diaphragm leakage detection The non-return valve and the gap between the diaphragms are The combined overpressure and degassing valve (M) opens if factory-filled with a separating agent (paraffin oil). They are set in there is an excessive pressure build-up in the dosing system and such a way during start-up on the test stand that there is always a provokes the constant degassing of the hydraulic medium.

  • Page 14: Dimensions

    5.2 Dimensions 5.2.1 Dimensions of single-head pumps All dimensions are in mm, except for the thread designations. Pump model DMH 280 97.5 G 3/8 85.5 117.5 14.5 DMH 281 97.5 G 5/8 85.5 117.5 DMH 283 G1 1/4 20.5 DMH 285 145.5 24.5 G1 1/4...

  • Page 15: Weight

    5.3 Weight 5.6 Data of contact pressure gauge for diaphragm leakage detection (optional) Weight [kg] Following data is not valid for contact pressure Pump Dosing head Note Single-head Double-head gauges in explosion-proof version. model material pump pump The contact pressure gauge has a reed switch with electrically isolated contact output, maximum switching power 10 W for DC Stainless steel current or 10 VA for AC current.

  • Page 16: Installation Location

    6.2 Installation location Maximum length Pump model / Nominal width of 6.2.1 Space required for operation and maintenance of suction line pump type suction line The pump must be installed in a position where it is Note easily accessible during operation and maintenance DMH 280 work.

  • Page 17: Optimum Installation

    6.5 Optimum installation Max. 1 m max. 1m Fig. 8 Example of optimum installation 6.6 Installation tips Pos. Components • For easy deaeration of the dosing head, install a ball valve Dosing tank (11i) with bypass line (back to the dosing tank) immediately after the discharge valve.
  • Page 18 • For non-degassing media with a viscosity similar to water, the Risk of damage to the system! pump can be mounted on the tank (observe the maximum It is always recommended to use pulsation dampers suction lift). for large high-speed pumps! Caution •...

  • Page 19: Pipe Lines

    6.7 Pipe lines 6.8.1 Connecting the dosing head deaeration The dosing head is equipped with a deaeration screw (V) and 6.7.1 General hose nipple (I). During deaeration, dosing medium leaks from the hose nipple. This may also happen during normal operation. The Warning dosing medium should either be collected directly or via a To protect the dosing system against excessive...

  • Page 20: Electrical Connections

    Observe the local safety regulations! The pump housing must only be opened by personnel authorised by Grundfos! Protect the cable connections and plugs against corrosion and humidity. Only remove the protective caps from the sockets that are being used.

  • Page 21: Start-Up/Shutdown

    The pump housing must only be opened by Fill the dosing head for start-up/subsequent start-up, see personnel authorised by Grundfos! section Filling the dosing head . If the pump does not start,...
  • Page 22 Check the oil level at least every two weeks and add Oil-filling screw with dipstick oil, if necessary. Stroke-length adjustment knob Only use original Grundfos gear oil! Note Cover for stroke-length adjustment knob For product numbers, see "Service kit catalogue" on www.grundfos.com...

  • Page 23: Start-Up/Subsequent Start-Up Of Dmh 281-288

    Immersion depth to marking: approx. 5 mm. Check the oil level at least every two weeks and add Fig. 26 Start-up of DMH 281-288 oil, if necessary. Only use original Grundfos gear oil! Note Pos. Components For product numbers, see "Service kit catalogue" on www.grundfos.com...

  • Page 24: Setting The Pressure Relief Valve

    8.4 Setting the pressure relief valve Risk of damage to the pump or system! The pressure relief valve is set to the pressure given by the When blocked, the pressure relief valve does not customer, or to the rated pressure (maximum counter-pressure). work properly and can produce pressures of several Caution The opening pressure can be set to a lower value by the...

  • Page 25: Operating The Pump

    8.5.3 Adjusting the zero point 8.6 Operating the pump When operating the pump, see sections 9. Operation Note 10. Maintenance and, if necessary, section 11. Fault finding chart 8.7 Shutdown Warning Wear protective clothing (gloves and goggles) when working on the dosing head, connections or lines! Do not allow any chemicals to leak from the pump.

  • Page 26: Operation

    9. Operation 9.3 Deaeration Manual deaeration of the dosing head (while the pump is 9.1 Switching on/off running) Before switching on the pump, check that it is Warning Caution installed correctly. See sections 6. Installation When dosing dangerous media, observe the 8.

  • Page 27: Electric Servomotor (Optional)

    Pos. Components The pump housing must only be opened by Connection for deaeration line personnel authorised by Grundfos! Contact pressure gauge Repairs must only be carried out by authorised and qualified personnel! Ball non-return valve...

  • Page 28: Checking The Oil Level

    10.4 Checking the oil level Check the oil level at least every two weeks and add Caution oil, if necessary. Rod length of oil dipstick: DMH 280-281: 27 mm. Note DMH 283-288: 35 mm. Immersion depth to marking: approx. 5 mm. 10.5 Cleaning the suction and discharge valves Warning Wear protective clothing (gloves and goggles) when...

  • Page 29: Replacing The Diaphragm And Gear Oil For Dosing Head With Single Diaphragm (No Diaphragm Leakage Detection)

    Before removing the dosing head, valves and lines, empty any remaining medium in the dosing head into a drip tray by carefully unscrewing the suction valve. Only use original Grundfos gear oil! Note For product numbers, see "Service kit catalogue" on www.grundfos.com...

  • Page 30: Replacing The Diaphragm For Dosing Head With Double Diaphragm

    4. Fit both new diaphragms (Q1 and Q2) and the parts (3q - 5q) a drip tray by carefully unscrewing the suction valve. in the correct order, as is shown in the diagrams (the clamping Only use original Grundfos gear oil! sleeves (6q) are used for centring purposes). Note For product numbers, see "Service kit catalogue"...
  • Page 31 "Service kit catalogue" on Note Note start-up! www.grundfos.com 10.7.4 Filling the double diaphragm with separating agent 10.7.5 Filling with gear oil After a diaphragm has broken, the ball non-return Risk of leaking oil and damage caused by oil loss!
  • Page 32 10.7.7 Cleaning the ball non-return valve Cleaning the ball non-return valve Only clean the ball non-return valve after a Note diaphragm breakage! Fig. 43 Contact pressure gauge Fig. 44 Ball non-return valve Pos. Components Contact pressure gauge Pos. Components Union nut O-ring Contact output Ball non-return valve body...

  • Page 33: Fault Finding Chart

    11. Fault finding chart Warning Actions that are taken to correct faults on the pump and that are not described in this manual, must only be carried out by personnel authorised by Grundfos! Fault Diagnosis Cause Remedy No motor sound or vibrations.

  • Page 34: Dosing Curves

    They apply to: 1. Use the public or private waste collection service. • performance of single pump (the flow rate is doubled for the 2. If this is not possible, contact the nearest Grundfos company double pump) or service workshop. •...
  • Page 35 Appendix 1. Dosing curves DMH 280 Q [l/h] 100 bar 10bar 200 bar 100bar Q [l/h] 200bar 10 bar 100 bar 10bar 200 bar 100bar 200bar 10 bar 10 20 30 40 50 60 70 80 90 100 h [%] 90 100 h [%] Fig.
  • Page 36 DMH 281 Q [l/h] 100 bar 10bar 100bar 60 bar 200 bar Q [l/h] 200bar 80 bar 100 bar 10 bar 100 bar 60 bar 80 bar 10 20 30 40 50 60 70 80 90 100 h [%] 10 20 40 50 70 80 90 100...
  • Page 37 Q [l/h] 75 bar Q [l/h] 75 bar 75 bar 100 bar 75bar 100 bar 100 bar 100bar 10 20 30 40 50 60 70 80 90 100 h [%] 10 20 30 40 50 60 70 80 90 100 h [%] Fig.
  • Page 38 DMH 283 Q [l/h] 50 bar 50bar Q [l/h] 100 bar 75 bar 100 bar 100bar 100 bar 50 bar 75 bar 50 bar 10 20 30 40 50 60 70 80 90 100 90 100 h [%] h [%] Fig. 23 DMH 27-100 (50 Hz), Q = 75 bar Fig.
  • Page 39 DMH 285 Q [l/h] 75 bar 100bar 100 bar 50bar 75 bar Q [l/h] 100bar 50 bar 75bar 100 bar 50bar 75bar 50 bar 10 20 30 40 50 60 70 80 90 100 h [%] 10 20 30 40 50 60 70 80 90 100 h [%] Fig.
  • Page 40 Q [l/h] 75 bar Q [l/h] 75 bar 100bar 100bar 100 bar 50bar 100 bar 50bar 75bar 50 bar 75bar 50 bar 10 20 30 40 50 60 70 80 90 100 h [%] 10 20 30 40 50 60 70 80 90 100 h [%] Fig.
  • Page 41 DMH 286 Q [l/h] 25 bar Q [l/h] 50bar 50 bar 25 bar 25bar 50 bar 50 bar 25 bar 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 h [%] h [%] Fig.
  • Page 42 DMH 287 Q [l/h] 180 bar 200bar Q [l/h] 200 bar 150bar 180 bar 200bar 180bar 150 bar 200 bar 150bar 180bar 150 bar 10 20 30 40 50 60 70 80 90 100 h [%] 10 20 30 40 50 60 70 80 90 100 h [%] Fig.
  • Page 43 Q [l/h] 160 bar 200bar 200 bar 100bar 160bar 100 bar 10 20 30 40 50 60 70 80 90 100 h [%] Fig. 54 DMH 50-200 (50 Hz), Q = 160 bar...
  • Page 44 DMH 288 Q [l/h] 100 bar Q [l/h] 100bar 100 bar 200 bar 100bar 200bar 200 bar 200bar 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 h [%] h [%] Fig.
  • Page 45 Q [l/h] 100 bar 100bar 200 bar 200bar 10 20 30 40 50 60 70 80 90 100 h [%] Fig. 63 DMH 15-200 (50 Hz), Q = 100 bar Q [l/h] 100 bar 100bar 200 bar 200bar 10 20 30 40 50 60 70 80 90 100 h [%] Fig.
  • Page 46 Appendix Safety declaration Please copy, fill in and sign this sheet and attach it to the pump returned for service. Fill in this document using English or German Note language. We hereby declare that this product is free from hazardous chemicals, biological and radioactive substances: Product type: ________________________________ Model number: _____________________________...
  • Page 47 Phone: +55-11 4393 5533 20th km. Athinon-Markopoulou Av. Telefax: +64-9-415 3250 Turkey Telefax: +55-11 4343 5015 P.O. Box 71 GRUNDFOS POMPA San. ve Tic. Ltd. Sti. Norway Bulgaria GR-19002 Peania Gebze Organize Sanayi Bölgesi GRUNDFOS Pumper A/S Grundfos Bulgaria EOOD...
  • Page 48 99558950 0819 ECM: 1250494 www.grundfos.com...

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