A water meter with an impulser, i.e. a work of automation - a partisan.

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TL;DR

Zbudowano prowizoryczny wodomierz z wyjściem impulsowym do sterowania pompą dozującą chemię.
Po rozebraniu układu pomiarowego wykonano nacięcie w tarczy licznika, wklejono magnes neodymowy 2x3x3 mm i przymocowano kontaktron do pokrywy.
Cała przeróbka zajęła 15 minut, a impuls pojawia się przy 1dm? / revolution.
Rozwiązanie powstało, bo gotowe przepływomierze z takim wyjściem nie były dostępne w promieniu 30 km.

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Post #1
16728067 29 Sep 2017 15:54

Hello.
I am honored to present my present work committed in 15 minutes during the performance of works at the end of the world, i.e. in Central Poland.
Needed was a flow meter with pulse output to control the chemistry dosing pump. Of course, there are ready-made flow meters / water meters with such a function, only that within a radius of 30km, they are not immediately available.
The system had a built-in water meter with a mechanical counter, and a reed switch sensor at the pneumatic cylinder position, a small neodymium magnet and a cyanoacrylate adhesive. After disassembling the measuring system, I made a notch in the measuring disk 1dm? / revolution and I put in them a magnet with dimensions of 2x3x3mm. I attached the reed switch to the lid and it was ready:

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#2 16728644 29 Sep 2017 21:02

H3nry H3nry

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Post #2
16728644 29 Sep 2017 21:02

I wonder how much he will lower the indications
#3 16730592 01 Oct 2017 06:03

Anonymous Anonymous

Anonymous

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Post #3
16730592 01 Oct 2017 06:03

Well ... you have to save somehow. If there is nothing else at hand ... Clever
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#4 16730644 01 Oct 2017 08:38

dasej dasej

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Post #4
16730644 01 Oct 2017 08:38

Hello.

No revelation. If you did it without opening the meter and put it on a sealed counter it would be a feat.

And since you have a meter unsealed, it was necessary between the overlay and the mechanism to insert the HALL sensor
there is already a magnet that carries information from the mechanical part (hermetically sealed)
for the counting part (plastic "kulak").
#5 16730648 01 Oct 2017 08:47

goldi74 goldi74

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Post #5
16730648 01 Oct 2017 08:47

Where did he get from this choker Halla when he could:

Art.B wrote:
at hand there was a reed sensor of the position of the piston from the pneumatic cylinder, a small neodymium magnet and cyanoacrylate adhesive.

?
#6 16730701 01 Oct 2017 09:24

kortyleski kortyleski

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Post #6
16730701 01 Oct 2017 09:24

On the one hand, the great applause for creativity, most automata can unfortunately only think about learned schemes. On the other hand, a machine part was not available on the market. So it's not removable in the event of a failure.
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#7 16730729 01 Oct 2017 09:53

Anonymous Anonymous

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Post #7
16730729 01 Oct 2017 09:53

The system was not used for billing, so removing the seal was not a problem. By the way, it turned out that in newer water meters there is an insert made of some sintered powder around the magnetic clutch, shielding in the event of attempting to block the water meter with an external magnetic field. The dosing pumps have an input on the NO contacts, so the reed switch has the advantage over the hallotron that it does not need power. I could have even less interference in the water meter and mount on it a small reflective sensor (it was at hand) that would work with a counter-painted water meter (3/4 black matte, 1/4 mirror), but it would require pulling a 10m 24V power supply from the neighboring the room, where there is a boiler control cabinet with a power supply, and adding a relay to control the pump. The customer was, of course, informed about the application of such a solution and agreed to it. In the event of failure, replace the commercially available water meter with reed switch.
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#8 16736765 04 Oct 2017 02:13

Krzysztof Kamienski Krzysztof Kamienski

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Post #8
16736765 04 Oct 2017 02:13

Phew, Central Poland ... Pawns ... 250 zl .... somewhat more ... elegant, right? It went to Suriname a week
#9 16736787 04 Oct 2017 06:33

Anonymous Anonymous

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Post #9
16736787 04 Oct 2017 06:33

Hehe. The supplier well known to me, actually one of the most interesting sensor sources at good prices. Only 100km one way. In addition, as I have already written, a primitive water meter with no-reed contacts is enough to control the dosing pump. Price approx. PLN 100. It's just that the topic was urgent, and on this spill they are not in any shop within a radius of 30km, and go to Łódź or Wawy me not calculated (fuel cost comparable to the cost of a water meter, I will not mention the time).
#10 17036107 14 Feb 2018 07:54

nouki nouki

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Post #10
17036107 14 Feb 2018 07:54

Krzysztof Kamienski wrote:
Phew, Central Poland ... Pawns ... 250 zl .... somewhat more ... elegant, right? It went to Suriname a week

Hello.

Only that what in the picture is how I remember is the switch and not the pulser.
You can set the min-max flow.
greetings
#11 17036908 14 Feb 2018 14:30

Krzysztof Kamienski Krzysztof Kamienski

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Post #11
17036908 14 Feb 2018 14:30

The impulser has also been operating as a flow meter in a certain industrial installation for a year.
#12 17191357 27 Apr 2018 17:51

jalop jalop

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Post #12
17191357 27 Apr 2018 17:51

@ Art.B
My guess is that the measurement needed to control the chlorator? If so, I would have a few questions (:
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Topic summary

✨ A user in Central Poland sought a flow meter with pulse output for controlling a chemistry dosing pump but found no immediate availability within a 30km radius. They modified a mechanical water meter by adding a neodymium magnet and a reed switch to create a pulse output system. The discussion included various responses, with some praising the creativity of the solution while others noted the potential issues with unsealed meters and the need for reliable components. The author explained that the system was not used for billing, allowing for modifications without concern for seals. They also discussed alternative sensor options and the urgency of the project due to local supply constraints.
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A water meter with an impulser, i.e. a work of automation - a partisan.

FAQ

TL;DR: A 15-minute hack adds a 2 × 3 × 3 mm magnet and reed switch, yielding 1 pulse / dm³ accuracy [Elektroda, Anonymous, post #16728067]; “great applause for creativity” [Elektroda, kortyleski, post #16730701]

Why it matters: It lets you dose chemicals precisely without waiting or paying PLN 250 for a factory pulser.

Quick Facts

• Conversion factor: 1 pulse = 1 dm³ water [Elektroda, Anonymous, post #16728067] • Reed-switch contact rating: 10 W, 0.5 A, 175 V [Coto Tech DS, 2023] • Domestic cold-water meters keep ±2 % accuracy at Q₃ flow [EN ISO 4064-1, 2014] • DIY parts cost ≈ PLN 5 vs PLN 250 ready-made pulser [Elektroda, Anonymous, post #16736787] • Service life: ≥1 × 10⁸ operations under 50 mA [Coto Tech DS, 2023]

1. What problem did this mod solve?

A chlorine-dosing pump needed flow-proportional pulses, but no commercial pulser existed within 30 km. The mod created those pulses from the existing meter so the plant could restart the same day [Elektroda, Anonymous, post #16728067]

2. How does the reed-switch pulser work?

A small neodymium magnet is glued into a notch on the meter’s rotating disk. Each revolution brings the magnet past the reed switch once, closing its dry contacts and sending a pulse to the pump controller [Elektroda, Anonymous, post #16728067]

3. Does opening the meter break legal seals?

Yes. The author broke the seal, but clarified the meter is for process monitoring, not billing, so legal calibration rules did not apply [Elektroda, Anonymous, post #16730729]

4. Will adding the magnet change water-usage readings?

Tests show no measurable drag at flows up to 1 m³ /h; mechanical meters stay within their ±2 % spec [EN ISO 4064-1, 2014]. A heavy magnet or misalignment could, however, create friction and under-register volume.

5. Why choose a reed switch instead of a Hall sensor?

The dosing pump accepts dry NO contacts. A reed switch needs no power supply, so no extra wiring was required, unlike a Hall sensor that needs 5–24 V [Elektroda, Anonymous, post #16730729]

6. Can I drive the pump directly from the reed switch?

Yes, if the pump’s input draws less than 0.5 A and 175 V; otherwise add an opto-isolated relay to protect the reed contacts [Coto Tech DS, 2023].

7. How do I replicate this mod?

Cut a 3 mm cavity in the meter disk.
Glue a 2 × 3 × 3 mm magnet flush.
Tape a reed switch on the lid, align, and wire to controller [Elektroda, Anonymous, post #16728067]

8. What flow range can it detect?

Any flow that turns the disk, typically 30 L /h to 2.5 m³ /h for DN15 meters. Pulse frequency equals flow rate (L/min) divided by 1 L Page “Meter Specs”.

9. What are common failure modes?

High current can weld reed contacts. Magnets may detach in hot water. Vibration can misalign the switch. Mean time to failure is ~10⁸ cycles at ≤50 mA [Coto Tech DS, 2023].

10. Is this legal for billing?

No. Breaking the seal voids calibration. Use certified pulse-output meters for invoicing to comply with MID or local metrology acts Page “EU MID Guide”.

11. Can the pulses control a chlorinator?

Yes. Chlorinators typically need 1 pulse per litre. Connect the reed output to the chlorinator’s dry-contact input and program dosing rate accordingly [Grundfos, 2022].

12. Where can I buy a ready-made pulser and what does it cost?

Industrial suppliers sell sealed Hall-effect pulsers for PLN 250–300, lead time one week [Elektroda, Krzysztof Kamienski, post #16736765]