Grundfos DMH 251 Installation And Operating Instructions Manual
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Grundfos DMH 251 Installation And Operating Instructions Manual

Grundfos DMH 251 Installation And Operating Instructions Manual

Dosing pump
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GRUNDFOS ALLDOS INSTRUCTIONS
DMH 25x
Dosing pump
Installation and operating instructions

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Summary of Contents for Grundfos DMH 251

  • Page 1 GRUNDFOS ALLDOS INSTRUCTIONS DMH 25x Dosing pump Installation and operating instructions...

  • Page 2: Declaration Of Conformity

    Declaration of Conformity We Grundfos Alldos declare under our sole responsibility that the products DMH 251, DMH 252, DMH 253, DMH 254, DMH 255, DMH 256 and DMH 257, to which this declaration relates, are in conformity with the Council Directives on the approximation of the laws of the EC Member States relating to —...

  • Page 3: Table Of Contents

    Grundfos Alldos company. General description Dimensional sketches 1.2 Service documentation Weight Stroke volume If you have any questions, please contact the nearest Grundfos Materials Alldos company or service workshop. Data of contact pressure gauge for diaphragm leakage detection (optional) Installation...

  • Page 4: Installation Data

    2. Installation data Please fill in the data below after commissioning. It will help you and your Grundfos Alldos service Note partner to make subsequent adjustments to the installation. Owner: Grundfos Alldos customer number: Order number: Product number: Pump serial number:...

  • Page 5: General Information

    Grundfos Alldos accepts no liability for any damage resulting from incorrect use. 5.4 Safety-conscious working The safety instructions in this manual, applicable national health 4.2 Warranty...

  • Page 6: Unauthorised Modification And Manufacture Of Spare Parts

    Do not operate the pump next to closed valves. Warning The pump housing, control unit and sensors must only be opened by personnel authorised by Grundfos Alldos! Repairs must only be carried out by authorised and qualified personnel! Wear protective clothing (gloves and goggles)

  • Page 7: Type Key

    6.2 Type key DMH 100 - 10 AR PP /E -F -G 1 B9B9 F Example: Type range Motor variant PTC motor for frequency control Maximum flow [l/h] Motor type EEx de C T3, 3 x 400 V, 50 Hz Maximum pressure [bar] Motor type EEx de C T4, 3 x 400 V, 50 Hz Control variant...

  • Page 8: Pump Types

    Single pump Double pump rate rate rate [l/h] [bar] [n/min] [l/h] [bar] [n/min] [l/h] [bar] [n/min] DMH 251 DMH 2.4-10 DMH 2.4-10/2.4-10 DMH 5-10 DMH 5-10/5-10 DMH 13-10 DMH 13-10/13-10 DMH 19-10 DMH 19-10/19-10 — — — DMH 24-10 DMH 24-10/24-10 —...
  • Page 9 2 bar (20 m WC), a pressure-loading valve must 6.4.2 Inlet pressure and counter-pressure / suction lift be installed immediately before the dosing point. Maximum inlet pressure Pump type [bar] DMH 251 DMH 252 DMH 253 DMH 254 DMH 255 DMH 257...
  • Page 10 Pump type Single pump Double pump p max. [bar] Single pump Double pump DMH 257 DMH 220-10 DMH 220-10/220-10 DMH 251 DMH 440-10 DMH 440-10/440-10 DMH 2.4-10 DMH 2.4-10/2.4-10 DMH 575-10 DMH 575-10/575-10 DMH 5-10 DMH 5-10/5-10 DMH 750-4 DMH 750-4/750-4...

  • Page 11: Sound Pressure Level

    (stores a maximum of 65,000 pulses) Caution Do not install outdoors! • two-stage tank-empty signal (e.g. via Grundfos Alldos tank Pumps with AR control unit only empty sensor) Maximum permissible mains impedance: 0.084 + j 0.084 Ω •...

  • Page 12: Transport And Storage

    Caution DIN 2.4610* classified as contaminated. If Grundfos Alldos is requested to service the pump, it must be PVDF** –10 ensured that the pump is free from substances that can be injurious to health or toxic.

  • Page 13: Product Description And Accessories

    10 % to 100 % using the stroke-length adjustment knob and stroke area. The sliding plug (5p) envelops the holes during the Nonius (L). stroke and seals the stroke area from the drive area. DMH 251, 252 Fig. 2 DMH 253 Fig. 3...
  • Page 14 DMH 254 Fig. 4 DMH 255 Fig. 5...
  • Page 15 DMH 257 Fig. 6 8.1.3 Double-diaphragm system / diaphragm leakage Pos. Components detection (optional) Motor General Worm gearing The piston diaphragm and high-tech dosing pumps with drift-free diaphragm leakage detection are equipped with the following: Eccentric • dosing head with PTFE double-diaphragm system Recuperating spring (not with drive size 3) •...
  • Page 16 Functional principle of diaphragm leakage detection The non-return valve and the gap between the diaphragms are factory-filled with a separating agent (paraffin oil). They are set in such a way during start-up on the test stand that there is always a hydraulically separated equilibrium between the valve and diaphragm gap (the pressure gauge indicates "0"...

  • Page 17: Dimensional Sketches

    8.2 Dimensional sketches 8.2.1 DMH 251, 252, 253 l / l' DMH 251, 252, 253 Fig. 8 Pos. Description For double pump, motor turned by 180 ° For electrical stroke-length adjustment l’ For pneumatic stroke-length adjustment Pump type l’ DMH 251...
  • Page 18 8.2.2 DMH 254, 255, 257 l / l' DMH 254, 255, 257 Fig. 9 Pos. Description For double pump, motor turned by 180 ° fx, mx For double pumps For electrical stroke-length adjustment l’ For pneumatic stroke-length adjustment Pump type l’...

  • Page 19: Weight

    100 V, maximum switching current 0.5 A. PVC, PP, PVDF The switching function is set up as an NC contact, i.e. if the DMH 251 Stainless steel diaphragm breaks, the current circuit is interrupted. 1.4571, 2.4610 The pressure gauge has a 2-metre cable.

  • Page 20: Approximate Values When Using Pulsation Dampers

    Pump type width of [n/min] suction line DMH 194-10 DN 20 suction line DMH 270-10 DN 20 DMH 251 DMH 332-10 DN 20 DMH 403-10 DN 20 DMH 2.4-10 DN 8 DMH 550-10 DN 20 DMH 5-10 DN 8...

  • Page 21: Optimum Installation

    9.5 Optimum installation Max. 1 m max. 1m Fig. 10 Example of optimum installation • For non-degassing media with a viscosity similar to water, the Pos. Components pump can be mounted on the tank (observe the maximum suction lift). Dosing tank •...

  • Page 22: Tube / Pipe Lines

    • To avoid the siphon effect, install a pressure-loading valve (7i) To protect the system, use pulsation dampers (8i) in the discharge line and, if necessary, a solenoid valve (14i) in for rigid piping longer than 2 metres and tubing the suction line.

  • Page 23: Electrical Connections

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

  • Page 24: Diaphragm Controller (Optional)

    Pos. Components suction valve. Contact pressure gauge The pump housing must only be opened by Union nut personnel authorised by Grundfos Alldos! Contact output Repairs must only be carried out by authorised and qualified personnel! Ball non-return valve Connection piece...

  • Page 25: Dmh 251, 252 And

    For product number, see service instructions. Note (indicated by an arrow on the valve)! Pump type Version Description 11.2 Start-up / subsequent start-up of DMH 251, 252 1.3 l white oil and 253 DMH 251 Single/double (Paraffin 55 DAB7) 1.3 l white oil...

  • Page 26: Setting The Pressure Relief Valve

    Note Immersion depth to marking: approx. 5 mm. Check the oil level at least every two weeks and add oil, if necessary. Note Only use original Grundfos Alldos gear oil! For product number, see service instructions. Pump type Version Description Fig.

  • Page 27: Zero Point Adjustments

    9. Depending on the application, tighten the locking screw (2l) so 11.5 Zero point adjustments that the stroke-length adjustment knob can still be turned/ 11.5.1 Adjusting the zero point for system pressures up to cannot be turned any more. 100 bar 10.Replace the cover (1l).
  • Page 28 The pump housing must only be opened by personnel authorised by Grundfos Alldos! Repairs must only be carried out by authorised and qualified personnel! Switch off the pump and disconnect it from the...
  • Page 29 Check the oil level at least every two weeks and Caution as an option add oil, if necessary. Rod length of oil dipstick: DMH 251-253: 27 mm. Note DMH 254-257: 35 mm. Immersion depth to marking: approx. 5 mm. 13.5 Cleaning the suction and discharge valves...
  • Page 30 13.6.3 Replacing a single diaphragm (no diaphragm leakage suction valve. detection) • Remove the diaphragm and fit a new diaphragm (Q) on the Only use original Grundfos Alldos gear oil! suction side. See fig. 38. Note For product number, see service instructions. Pump type...
  • Page 31 1. Check that the locking screw (B) is tightened. suction valve. 2. Slacken and remove the oil-filling screw (F). Only use original Grundfos Alldos gear oil! Note 3. Set the stroke-length adjustment knob (L) to "0". For product number, see service instructions.
  • Page 32 Filling quantity Pump type [ml] After a diaphragm has broken, the ball non-return valve must be cleaned before the diaphragm is DMH 251-253 Caution filled with separating agent. Only clean the ball DMH 254 non-return valve after a diaphragm breakage!
  • Page 33 After approximately 6-10 operating hours or two days, cross-tighten the dosing head screws using a torque wrench. Torques Torque Pump type [Nm] DMH 251, 10 bar 8-10 DMH 251, 16 bar 10-12 DMH 251, 25 bar 13-15 DMH 252 8-10...
  • Page 34 14. 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 Alldos! Fault Diagnosis Cause Remedy No motor sound or vibrations.
  • Page 35 Fault Diagnosis Cause Remedy Suction valve: During the discharge stroke, the dosing liquid flows back into the suction line. Discharge valve: During the suction Suction/discharge valves dirty or leaky. Clean or replace valves. stroke, the dosing liquid flows back into the dosing head. The pump takes in less.
  • Page 36 10 20 30 40 50 60 70 80 90 100 Zero point of the pump h [%] Stroke length Fig. 47 DMH 13-10 (60 Hz), Q = 3 bar DMH 251 Q [l/h] Q [l/h] 3 bar 3 bar 3bar...
  • Page 37 Q [l/h] Q [l/h] 10 bar 10 bar 3bar 16 bar 3bar 16 bar 10bar 10bar 16bar 16bar 3 bar 3 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 38 Q [l/h] Q [l/h] 20 bar 20 bar 20bar 20bar 25 bar 25 bar 25bar 25bar 10bar 10 bar 10bar 10 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 39 DMH 252 Q [l/h] Q [l/h] 3 bar 3 bar 3bar 3bar 10 bar 10bar 10 bar 10bar 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 h [%] h [%] Fig.
  • Page 40 Q [l/h] Q [l/h] 10 bar 10 bar 16bar 16bar 16 bar 16 bar 10bar 10bar 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 h [%] h [%] Fig.
  • Page 41 DMH 253 Q [l/h] Q [l/h] 3 bar 3 bar 3bar 10 bar 3bar 10 bar 10bar 10bar h [%] h [%] Fig. 86 DMH 67-10 (50 Hz), Q = 3 bar Fig. 82 DMH 21-10 (50 Hz), Q = 3 bar Q [l/h] Q [l/h] 3 bar...
  • Page 42 Q [l/h] 3 bar 3bar 10 bar 10bar 90 100 h [%] Fig. 90 DMH 100-10 (50 Hz), Q = 3 bar...
  • Page 43 DMH 254 Q [l/h] Q [l/h] 3 bar 3 bar 3bar 3bar 10 bar 10 bar 10bar 10bar 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 h [%] h [%] Fig.
  • Page 44 Q [l/h] Q [l/h] 3 bar 3bar 10 bar 10 bar 10bar 10bar 16 bar 16bar 10 20 30 40 50 60 70 80 90 100 h [%] h [%] Fig. 99 DMH 291-10 (50 Hz), Q = 3 bar Fig.
  • Page 45 Q [l/h] 10 bar 10bar 16 bar 16bar 90 100 h [%] Fig. 107 DMH 202-16 (60 Hz), Q = 10 bar Q [l/h] 10 bar 10bar 16 bar 16bar 90 100 h [%] Fig. 108 DMH 276-16 (50 Hz), Q = 10 bar...
  • Page 46 DMH 255 Q [l/h] Q [l/h] 3 bar 3 bar 3bar 3bar 10 bar 10 bar 10bar 10bar 90 100 h [%] h [%] Fig. 109 DMH 194-10 (50 Hz), Q = 3 bar Fig. 113 DMH 332-10 (50 Hz), Q = 3 bar Q [l/h] Q [l/h]...
  • Page 47 Q [l/h] 3 bar 10bar 10 bar 3bar 90 100 h [%] Fig. 117 DMH 550-10 (50 Hz), Q = 3 bar...
  • Page 48 DMH 257 Q [l/h] Q [l/h] 3 bar 10bar 3 bar 10 bar 10bar 3bar 10 bar 3bar 90 100 h [%] h [%] Fig. 122 DMH 575-10 (50 Hz), Q = 3 bar Fig. 118 DMH 220-10 (50 Hz), Q = 3 bar Q [l/h] Q [l/h]...
  • Page 49 This product or parts of it must be disposed of in an environmentally sound way: 1200 1. Use appropriate waste collection services. Q [l/h] 2. If this is not possible, contact the nearest Grundfos or 1000 Grundfos Alldos company or service workshop. 3 bar 3bar...
  • Page 50 Safety declaration Please copy, fill in and sign this sheet and attach it to the pump returned for service. We hereby declare that this product is free from hazardous chemicals, biological and radioactive substances: Product type: ________________________________ Model number: _____________________________ No media or water: _____________________________ A chemical solution, name: _________________________ (see pump nameplate)
  • Page 51 Mark GRUNDFOS Ltda. Turkey 20th km. Athinon-Markopoulou Av. 17 Beatrice Tinsley Crescent Av. Humberto de Alencar Castelo Branco, GRUNDFOS POMPA San. ve Tic. Ltd. Sti. P.O. Box 71 North Harbour Industrial Estate Gebze Organize Sanayi Bölgesi GR-19002 Peania Albany, Auckland...
  • Page 52 Being responsible is our foundation Thinking ahead makes it possible Innovation is the essence 15.720164 V1.0 96771725 0408 15.720148 V2.0 96681452 1207 15.720094 V2.0 96681439 1207 15.720033 V2.0 96681393 1207 Repl. Repl. 15.720039 V2.0 96681398 1207 15.720045 V2.0 96681403 1207 15.720051 V2.0 96681408 1207 www.grundfosalldos.com...

This manual is also suitable for:

Dmh 252Dmh 253Dmh 254Dmh 255Dmh 256Dmh 257

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