Neptune NXP-M Скачать руководство пользователя страница 22

Hydraulic installations

Hydraulic accessories

22

Stepper motor-driven diaphragm dosing pump NXP-M and NXP-P

Operating instructions

8.7.2  Contact-type water meter

The contact-type water meter measures the throughflow in a pipe and 
sends a pulse to the dosing pump, which then starts dosing. This means 
that ideal proportional dosing is also possible with large throughflow 
fluctuations.

The contact water meter is connected to connection port 2 (see chapter 
9.2.2 “Connection socket 2“ on page 25).

The ratio of throughflow to executed strokes of the dosing pump is 
determined in "Pulse input" mode (see chapter "Water meter" on page 
24).

8.7.3  Pressure-relief valve

Pressure relief valves have an important safety function for protecting the 
dosing pump and the associated pipes and fittings. The dosing pump can 
generate a pressure that is many times the rated one. A blocked pressure 
line can lead to dosing medium escaping. 

An improperly high pressure can occur if:

the shut-off valves are closed even though the dosing pump is 
running,

pipes block.

At an appropriate pressure, a pressure relief valve opens a bypass line 
and protects the system in this way from damage caused by over-pres-
sure.

Notes on assembly:

The line for returning dosing medium from the pressure relief valve 
must be routed to the dosing tank or to a collecting pan.

The pressure in the dosing tank must not be too high so that it is 
possible to accommodate the returned dosing medium.

As an alternative, the system can return dosing medium into the 
suction line in front of the dosing pump. In this case, there must not be 
a non-return valve or a foot valve in the suction line. 

You should install the pressure relief valve as close as possible to the 
dosing head.

8.7.4  Back-pressure valve

Back-pressure control valves are necessary if:

There are considerably fluctuating system pressures,

the pressure on the suction side is higher than on the discharge side 
or if you intend to carry out dosing into depressurized lines.

In cases like this, if you do not use a back-pressure valve, imprecise 
dosing results will occur or overloading will result. The back-pressure 
valve solves these problems by generating a defined, constant backpres-
sure.

In some circumstances, a back-pressure valve is unnecessary if you use 
a hose injection nozzle and if the backpressure that it generates is 
adequate.

8.7.5  Pulsation dampener

Pulsation dampeners have the following functions:

Damping pulsating delivery flows for processes that require 
low-pulsation dosing,

reducing the throughflow resistance with long pipelines.

When installed on the suction side:

Damping of acceleration mass forces and with this reduction of wear 
on the dosing pump.

Preventing cavitation (pull-off of the liquid column) due to too high 
acceleration.

However, pulsation dampeners also have important safety functions, 
since they prevent pressure peaks from arising that lead to piping 
vibrating and cause them to snap.

This problem can occur:

With the high amplitudes of the vibrations,

when using long pipes (the severity of the pulsation increases with the 
length of the pipe),

when using rigid piping instead of elastic hoses.

Notes on assembly:

You should carry out assembly in the direct vicinity of the location 
where you want to damp the pressure peaks (directly in front of the 
suction valve or directly behind the discharge valve).

Pulsation dampeners should be installed with throttle valves or 
back-pressure valves installed directly behind them. By setting the 
valves appropriately, you can further-optimise damping of the 
pulsations.

To prevent unnecessary pipe friction losses, you should lay the 
connecting line straight and in accordance with the rated width of the 
pulsation dampener.

You must separately fasten relatively large pulsation dampeners and 
ones with hose connections.

Pipelines must not transfer any mechanical tensions onto the 
pulsation dampener.

8.7.6  Priming aid

Priming aids are particularly advisable:

In the case of dosing pumps with small volumetric displacements per 
stroke or with low stroke length settings,

with high suction hights,

with highly dense dosing media,

at priming for the first time due to dry valves and air in the suction line 
and the dosing head,

in dosing systems with frequent downtimes.

Further advantages resulting from priming aids:

Preventing cavitation in the suction line,

gas removal,

optical dosing control with small amounts,

smoothing of the suction flow.

8.7.7  Level monitoring

Only for NXP-P: Level monitoring of suction-side feeding of the dosing 
medium to prevent the tank being sucked dry and to ensure that it can be 
topped up again in good time.

Содержание NXP-M

Страница 1: ...Neptune stepper motor driven diaphragm pump NXP M and NXP P Operating instructions Read the operating manual The user is responsible for installation and operation related mistakes...

Страница 2: ......

Страница 3: ...ions 15 6 1 NXP M P 68 through 285 15 6 2 NXP M P 375 540 and 810 16 7 Installing the Dosing Pump 17 7 1 Set up information 17 7 2 Installation examples 17 8 Hydraulic installations 18 8 1 Design of t...

Страница 4: ...Refers to a potentially hazardous situation Failure to follow this instruction may lead to death or severe injuries CAUTION Refers to a potentially hazardous situation Failure to follow this instruct...

Страница 5: ...e using are suitable for the dosing medium Make sure that the lubricants adhesives sealants etc that you use are suitable for the dosing medium WARNING Caustic burns or other burns through dosing medi...

Страница 6: ...Sheets to the dosing media find out what protective equipment you need You will require the minimum of the following personal protective equipment Personal protective equipment required Protective gog...

Страница 7: ...ves 2 5 2 Trained persons Trained persons have received training from the operator about the tasks they are to perform and about the dangers stemming from improper behaviour In the table below you can...

Страница 8: ...characteristic curves on page 40 n Comply with the information regarding the operating and environmen tal conditions see chapter 5 Technical data on page 13 n Any restrictions regarding the viscosity...

Страница 9: ...g operational disturbances n Elimination of operational disturbances by personnel without adequate qualifications n Deposits in the dosing head due to inadequate purging particularly with suspensions...

Страница 10: ...e 4 2 Scope of delivery Please compare the delivery note with the scope of delivery The following items are part of the scope of delivery n Dosing pump NXP M and NXP P n One set each of hose clamping...

Страница 11: ...his results in a pulsing flow If the dosing pump is in the suction stroke phase the diaphragm is pulled into the rear final position Due to the resulting vacuum in the dosing head the discharge valve...

Страница 12: ...stroke at different speeds For low supply rates for example the dosing pump performs the suction stroke at the maximum speed and adjusts the speed of the pressure stroke to match the desired supply r...

Страница 13: ...1 26 1 60 2 36 3 44 Average delivery pressure psig 145 116 72 44 36 22 Max stroke frequency min 1 150 Table 11 Output data with a PVC design 5 2 Operating conditions and limits Information Value NXP...

Страница 14: ...pply 110 240 V AC 10 5 50 60 Hz Power consumption W 25 Table 14 Electrical specifications 5 4 Other data Information Value NXP M and NXP P Size M68 P68 M140 P140 M285 P285 M375 P375 M540 P540 M810 P81...

Страница 15: ...ith dosing head made of PVC PP or PVDF all dimensions in inch 9 33 7 95 3 15 0 67 L L 4 72 7 08 2 32 2 76 0 25 3 94 4 57 3 15 Fig 8 Dimensioned drawing of NXP M P 68 through 285 with dosing head made...

Страница 16: ...76 0 26 3 31 3 94 4 57 9 33 7 93 Fig 9 Dimensioned drawing of NXP M P 375 540 and 810 with dosing head made of PVC PP PVDF or stainless steel 1 4571 all dimensions in mm Hose clamp connector Material...

Страница 17: ...e vibration free and stable n There must be enough free space in the area of the dosing head and the suction and discharge valves for these parts to be easily dismantled if required The entire space r...

Страница 18: ...lled dosing processes damage to the piping and to the dosing pump Ensure that the pressure on the discharge side is at least 15 psig than on the suction side NOTE Locking of threads Stainless steel an...

Страница 19: ...changed in 90 intervals The suction valve 3 must always point downwards Accordingly arrow 2 and pressure valve 1 always point upwards This is irrespective of the positioning of the dosing head to the...

Страница 20: ...iece 5 Screw the union nut onto the valve of the dosing pump Hose clip connected 8 4 2 Making the glue in connection a b Fig 15 Glue in connection Perform the following working steps 1 Cut the PVC tub...

Страница 21: ...heads made of stainless steel For the procedure when venting refer to chapter 11 1 1 Venting the dosing pump on page 30 Fig 18 Dosing head venting facility with hose connection Perform the following w...

Страница 22: ...a back pressure valve is unnecessary if you use a hose injection nozzle and if the backpressure that it generates is adequate 8 7 5 Pulsation dampener Pulsation dampeners have the following functions...

Страница 23: ...ties since the positive delivery pressure reduces Further problems that can occur n Greater wear on the dosing pump e g diaphragm rupture due to the effects of heavy forces with particularly high tank...

Страница 24: ...earth 9 1 Principles n The dosing pump has a 110 240 V AC 50 60 Hz wide range power supply unit n The electrical connection comply with local regulations n The dosing pump must be plugged into a groun...

Страница 25: ...he conductive rubber band Fig 21 Conductive rubber band in connection socket 1 Remove the conductive rubber band before inserting the cable in the connection socket After the cable has been removed th...

Страница 26: ...itoring systems of Neptune An adapter is required if using older suction lines with a 0 14 inch jack plug You can find this adapter and additional cables in the Neptune price list Pin M12x1 A coded As...

Страница 27: ...rms a pressure stroke The Alarm LED 2 is lit when a fault has occurred see chapter 13 1 1 Alarm LED illuminates NXP M on page 36 10 2 Operating elements of the control NXP P Fig 24 Operator controls o...

Страница 28: ...lteration of the password WARNING Caustic burns or other burns through dosing media If the password protection is activated operation of the dosing pump is blocked The only way to stop a dosing pump w...

Страница 29: ...e 120 seconds even if this runs out during entry 4 3 2 1 OK Fig 27 Entering the password 1 Use the and keys to set a value from 0 to 9 for the first digit of the code and then press 2 Proceed as descr...

Страница 30: ...dosing pump is functioning correctly Check first whether undesirable reactions could occur between the actual dosing medium and the water Perform the following working steps 1 Open the shut off valve...

Страница 31: ...hen close the discharge 11 2 NXP P Operating modes The NXP P dosing pump has the following operating modes n Internal Manual setting of the delivery capacity n External Controlling the stroke frequenc...

Страница 32: ...irst 4 pulses 120 100 20 and this is added to the 3 pulses 90 20 110 The third dosing stroke also only requires 3 additional pulses 90 10 100 A further 4 pulses are then required for the fourth dosing...

Страница 33: ...You must follow the safety data sheet of the dosing medium 11 6 Storage Storing the dosing pump correctly extends its service life You should avoid negative influences such as extreme temperatures hi...

Страница 34: ...ury and material damage The dosing pump can generate a pressure that is many times the rated one The dosing medium can escape in the case of material failure or wear on the dosing head the connection...

Страница 35: ...by dosing medium residues The diaphragm 3 thread was lightly greased e g Molycote Longterm W2 1 Screw the diaphragm manually in the clockwise direction until it safely contacts into the diaphragm rod...

Страница 36: ...d Open the shut off valves Inspect the dosing pump for possible damage Suction head too high Set the dosing pump to feed or reduce the suction head Install a priming aid Table 30 Type of fault Dosing...

Страница 37: ...e valve in the pressure line Pressure peaks due to acceleration with long suction lines Install a suction pressure regulator Table 32 Type of fault Delivery rate varies Possible cause Remedy Imprecise...

Страница 38: ...ressure regulator The materials are not suitable for the dosing medium being used Check the resistance of the materials Diaphragm not screwed up to the end stop on the dia phragm rod Screw a new diaph...

Страница 39: ...ntaining n 1 Diaphragm item 1 n 1 set of dosing head screws item 3 n 1 set washers item 4 only NXP M P 375 540 810 Diaphragm kit Size Part No 68 NSP002 140 285 NSP003 375 540 810 NSP004 14 2 Dosing he...

Страница 40: ...es were determined on the manufacturer s test stands They apply at 68 F for water at 100 stroke frequency The delivery capacity depends on the medium density and viscosity and temperature Since these...

Страница 41: ...misuse 8 Function description 11 G General warnings 5 Glue in connection 20 H Handling instructions Marking 4 Hazards due to non compliance with the safety instructions 6 Hydraulic accessories 21 Hydr...

Страница 42: ...art up 30 Storage 33 Structure of the dosing pump 10 Suction pressure regulator 23 Suspensions 23 System piping 19 T Technical data 13 Temperatures Approved ambient temperature 13 Approved media tempe...

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