NPVA Flowmeter
Over the last twenty years many thousands of NPVA units
have been supplied to practically every industry in
the UK. All units are available on quick delivery from
our manufacturer's extensive stock.
Advantages
- 3-50,000 litres/hour liquid in 28 ranges each with
- 10:1 operating span
- 5 different overall lengths from 165-350mm
- Choice of tube materials depending upon operating
- temperature and pressure up to 100°C and 10 Bar
- Positive pipe 0-ring sealing requiring less tightening
- effort when installing
- Standard or magnetic floats (where alarms required)
- of identical mass ensure identical flow ranges when
- changing
- Optional bi-stable adjustable alarm on rear slide
- Optional 4-20 mA transmitter
- Special Scales produced for liquids and gasses
- other than water or air
Materials |
|
| Tube Material | Polyamide, PVC, Polysulphon |
| End Fittings | Rigid PVC socket connections for adhesive pipe coupling. BSP threads available. Special stainless steel inserts available. Cast iron end caps for higher temperature |
| Float | Fully encapsulated PVDF. Stabilising ring fitted to larger sizes ensuring steady flow indication without wobble |
| Float Stops | PVDF |
| 0-Rings | Standard EPDM, Special Viton, etc. available |
Technical Data |
|
| Accuracy | ±2.5% full scale |
| Max Pressure | 10 Bar operating (at 20°C – see chart for operating pressures versus temperature) |
| Temperature | PVC 60°C, PA 75°C, PSU 100°C (see chart) for operating pressures versus temperature) |
| Scaling | L/hour H20 standard plus 0-100% max flow. Special product scales available |
Pipework
PVC female BSP, metric and imperial sockets,
ABS sockets, polypropylene sockets, cast steel &
stainless steel BSP inserts.
Installation
Vertical – flow upwards. For best results ensure
pipework vertical to within 2/3°.
Valves
For liquids may be installed upstream or downstream.
For gases install valves downstream only.
Optional equipment
Up to 3 in number bi-stable or mono-stable switches,
comprising volt free contacts to handle 240V 5 amp
max current. A 4-20mA transmitter is also available.
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| Series | Dimensional mm | BSPF | P(1) | Weight | |||||
| NPVA | DN | d | DN inches | G | D | L1 | L2 | m bar | in grams (2) |
| 165 | 10 | 16 | 3/8” | 3/4” | 35 | 171 | 199 | 4.6 | 78 |
| 170 | 15 | 20 | 1/2” | 1” | 43 | 176 | 208 | 4.5 | 96 |
| 185 | 20 | 25 | 3/4” | 1 1/4” | 53 | 191 | 229 | 6.1 | 125 |
| 200 | 25 | 32 | 1” | 1 1/2” | 60 | 206 | 250 | 8.3 | 250 |
| 350 | 25 | 32 | 1” | 1 1/2” | 60 | 356 | 400 | 16.2 | 475 |
| 350 | 32 | 40 | 1 1/4” | 2” | 72 | 356 | 408 | 16.2 | 710 |
| 350 | 40 | 50 | 1 1/2” | 2 1/4” | 83 | 356 | 418 | 16.2 | 1050 |
| 350 | 50 | 63 | 2” | 2 3/4” | 103 | 356 | 432 | 27.6 | 1530 |
| 350 | 65 | 75 | 2 1/2” | 3 1/2” | 122 | 356 | 444 | 40.7 | 2100 |
| Nominal Size | Socket Bore | Air Range | Water Range | PVC Tube | Polyamide Tube | Polysulphate Tube | |||
| DN ins BSP | d' mm | NM3/hr 1 Bar Abs 20°C | l/hr 20°C | Std Float | Mag Float | Std Float | Mag Float | Std Float | Mag Float |
| Series NPVA165 | Range | Model Number | |||||||
| 3/8” | 17.1 | 0.2-1.0 | 3-22 | 47500 | 47683 | 47516 | 47699 | 47532 | 47715 |
| 3/8” | 17.1 | 0.2-2.5 | 5-50 | 47501 | 47684 | 47517 | 47700 | 47533 | 47716 |
| 3/8” | 17.1 | 0.6-3.6 | 10-90 | 47502 | 47685 | 47518 | 47701 | 47534 | 47717 |
| 3/8” | 17.1 | 0.5-9.0 | 25-250 | 47503 | 47686 | 47519 | 47702 | 47535 | 47718 |
| Series NPVA 170 | |||||||||
| 1/2” | 21.4 | 0.4-2.8 | 5-50 | 47504 | 47687 | 47520 | 47703 | 47536 | 47719 |
| 1/2” | 21.4 | 0.8-6.2 | 15-150 | 47505 | 47688 | 47521 | 47704 | 47537 | 47720 |
| 1/2” | 21.4 | 0.9-9.5 | 25-250 | 47506 | 47689 | 47522 | 47705 | 47538 | 47721 |
| 1/2” | 21.4 | 2.0-15.0 | 40-400 | 47507 | 47690 | 47523 | 47706 | 47539 | 47722 |
| Series NPVA 185 | |||||||||
| 3/4” | 26.5 | 0.5-5.0 | 15-150 | 47508 | 47691 | 47524 | 47707 | 47540 | 47723 |
| 3/4” | 26.5 | 2.0-14 | 40-400 | 47509 | 47692 | 47525 | 47708 | 47541 | 47724 |
| 3/4” | 26.5 | 2.5-22 | 60-600 | 47510 | 47693 | 47526 | 47709 | 47542 | 47725 |
| 3/4” | 26.5 | 4-34 | 100-1000 | 47511 | 47694 | 47527 | 47710 | 47543 | 47726 |
| Series NPVA 200 | |||||||||
| 1” | 33.6 | 1.0-8.0 | 25-250 | 47512 | 47695 | 47528 | 47711 | 47544 | 47727 |
| 1” | 33.6 | 2.0-14 | 40-400 | 47513 | 47696 | 47529 | 47712 | 47545 | 47728 |
| 1” | 33.6 | 4-34 | 100-1000 | 47514 | 47697 | 47530 | 47713 | 47546 | 47729 |
| 1” | 33.6 | 5-50 | 150-1500 | 47515 | 47698 | 47531 | 47714 | 47547 | 47730 |
| Series NPVA 335 | |||||||||
| 1” | 33.6 | 0.7-5.5 | 15-150 | 46271 | 47575 | 46298 | 47602 | 46325 | 47629 |
| 1” | 33.6 | 2.5-20 | 60-600 | 46272 | 47576 | 46299 | 47603 | 46326 | 47630 |
| 1” | 33.6 | 4-34 | 100-1000 | 46273 | 47577 | 46300 | 47604 | 46327 | 47631 |
| 1 1/2” | 33.6 | 8-70 | 200-2000 | 46282 | 47586 | 46309 | 47613 | 46336 | 47640 |
| 1 1/2” | 33.6 | 10-90 | 300-3000 | 46283 | 47587 | 46310 | 47614 | 46337 | 47641 |
| 2” | 33.6 | 22-190 | 600-6000 | 46287 | 47591 | 46314 | 47618 | 46341 | 47645 |
| 2” | 33.6 | 35-300 | 1000-10000 | 46288 | 47592 | 46315 | 47619 | 46342 | 47646 |
| 2 1/2” | 33.6 | 80-720 | 2500-25000 | 46293 | 47597 | 46320 | 47624 | 46347 | 47651 |
| 2 1/2” | 33.6 | 400-1500 | 10000-50000 | 46294 | 47598 | 46321 | 47625 | 46348 | 47652 |
| Series NPVA 350 | |||||||||
| 1” | 33.6 | 0.7-5.5 | 15-150 | 46274 | 47578 | 46301 | 47605 | 46328 | 47632 |
| 1” | 33.6 | 1.0-10.0 | 30-300 | 46275 | 47579 | 46302 | 47606 | 46329 | 47633 |
| 1” | 33.6 | 2.5-20 | 60-600 | 46276 | 47580 | 46303 | 47607 | 46330 | 47634 |
| 1” | 33.6 | 4-34 | 100-1000 | 46277 | 47581 | 46304 | 47608 | 46331 | 47635 |
| 1 1/4” | 42.2 | 5-50 | 150-1500 | 46279 | 47583 | 46306 | 47610 | 46333 | 47637 |
| 1 1/4” | 42.2 | 8.5-76 | 150-1500 | 46280 | 47584 | 46307 | 47611 | 46334 | 47638 |
| 1 1/2” | 48.3 | 8-70 | 200-2000 | 46284 | 47588 | 46311 | 47615 | 46338 | 47642 |
| 1 1/2” | 48.3 | 10-90 | 300-3000 | 46285 | 47589 | 46312 | 47616 | 46339 | 47643 |
| 2” | 60.3 | 14-125 | 400-4000 | 46289 | 47593 | 46316 | 47620 | 46343 | 47647 |
| 2” | 60.3 | 22-190 | 600-6000 | 46290 | 47594 | 46317 | 47621 | 46344 | 47648 |
| 2” | 60.3 | 35-300 | 1000-10000 | 46291 | 47595 | 46318 | 47622 | 46345 | 47649 |
| 2 1/2” | 75.2 | 50-500 | 1500-15000 | 46295 | 47599 | 46322 | 47626 | 46349 | 47653 |
| 2 1/2” | 75.2 | 80-720 | 2500-25000 | 46296 | 47600 | 46323 | 47627 | 46350 | 47654 |
| 2 1/2” | 75.2 | 400-1500 | 10000-50000 | 46297 | 47601 | 46324 | 47628 | 46351 | 47655 |
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