Flow Meters
Paddle Wheel Flow Meter
The Accumax Paddle Wheel Flow Meter measures volumetric total flow and flow rate from the rotation of a paddle wheel, whose revolutions are proportional to the flow. It is offered from 25 NB line size with a 4-20 mA output and RS485 Modbus communication, and supports six operating modes including totalizing, batching, flow comparison, rate switching, pulsing and a second independent totalizer.
Key specifications
- Accuracy
- +2% FS
- Output
- 4-20mA and RS485
- Power supply
- 230VAC / 24VDC - As per requirement
- Process pressure
- Max. 5 Kg/cm2
Key figures transcribed from the datasheet and pending engineering sign-off. Full specifications below.
Features
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High accuracy at low cost
Positioned by Accumax as delivering high accuracy in a low-cost meter (no numeric accuracy figure is given on the page).
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Robust design
Robust mechanical design.
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Easy installation
Easy to install.
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Line size from 25 NB
Available from 25 NB line size.
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4-20 mA output
Analog 4-20 mA output.
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RS485 Modbus
RS485 Modbus digital communication.
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Six operating modes
Indicator & Totalizer, Batcher, Flow Comparator, Rate Switch Mode, Pulser and Dual Totalizer.
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Batcher with halt and reject
Relay energizes on start and remains energized until a fixed quantity of liquid passes the sensor; halt and reject batch functions are included.
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Flow comparator mode
Two sensors on permeate and reject lines; displays both flow rates, calculates percentage recovery and alarms when recovery drops.
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Rate switch mode
Relay energizes whenever actual flow falls below or rises above the set value, displaying LOW/HIGH FLOW RATE - suited to flow interlock and chemical dosing.
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Pulser mode
Triggers a task on completion of a preset volume; configurable to any metering or dosing pump.
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Dual totalizer
A second totalizer that can be used regardless of the totalizer 1 settings.
Technical specifications
24 values · 7 groups
These values are transcribed from the manufacturer's datasheet and are pending engineering sign-off. Confirm critical figures with Accumax before specifying.
| Measurement | |
|---|---|
| Accuracy | +2% FS |
| Line size from | 25NB |
| Pipe sizes listed in Flow Range table | 25, 40, 50, 65, 80, 100NB |
| Flow range table units | Flow Range in m3/H |
| Calibration marking | Each fitting individually calibrated and marked with K factor (ml/pulse) |
| Modes (specification table) | Batcher, Flow Comparator, Rate Switch & Pulsar |
| Models | |
| Full bore turbine type | 25NB & 50NB Full Bore Turbine Type |
| Insertion type | Insertion Type available for 40NB, 50NB, 65NB, 80NB & 100NB line sizes |
| Insertion type option | Insertion type sensor also available with solvent cementable adaptors for PVC tees at extra cost |
| Electrical | |
| Display | 2 Line LCD |
| Output | 4-20mA and RS485 |
| Power Supply | 230VAC / 24VDC - As per requirement |
| High level signal | High level (5VDC) signal can be sets up to 100ft. without transmitter |
| Communication | |
| Serial | RS485 Modbus |
| GSM interface | GSM Interface compatible (marked with * = Optional) |
| Mechanical | |
| Housing | GF Nylon |
| Impeller | Poly Propylene |
| Bearing | Ceramic |
| Bearing note | Ceramic ball bearing for superior low flow performance |
| Pin / Shaft | Carbide / Ceramic |
| Environmental | |
| Pressure | Max. 5 Kg/cm2 |
| Temperature | Upto 50 deg. Celsius |
| Installation | |
| Straight run | For best results it is recommended to provide a straight run of 10 and 5D on the upstream and downstream respectively |
| Probe fitting | Fitting automatically sent probe at correct depth and orientation |
Source: Paddle_Wheel_FM_Brochure
3 further specification s are listed in the datasheet but not reproduced here
These labels appear in the datasheet, but the value beside them could not be read reliably from the document. Rather than print a figure we cannot stand behind, we have left them out — ask us and we will confirm them directly.
- Flow Range in m3/H - Min Flow per pipe size — the table has 6 pipe-size columns (25, 40, 50, 65, 80, 100 NB) but only 4 Min Flow cells survived the text layer (0.25, 0.5, 3.5, 14). Which columns the 4 values belong to cannot be determined, so no Min Flow figures are published.
- Flow Range in m3/H - Max Flow per pipe size — 6 pipe-size columns but only 5 Max Flow cells survived (19, 35, 50, 90, 140). Column mapping is unrecoverable, so no Max Flow figures are published.
- Protection / ingress rating — the brochure page 1 embeds an image whose filename is 'IP67-icon-2.png', but no IP rating text exists anywhere in the text layer, so no IP value is recorded.
Applications
- Volumetric total flow and flow rate measurement
- Batching
- Flow comparison and RO percentage recovery monitoring
- Flow interlock and chemical dosing
- Dosing pump control via pulse output
- Independent secondary totalizing
Frequently asked questions
What is the smallest line size available?
The meter is available from 25 NB line size.
What outputs does the paddle wheel flow meter provide?
A 4-20 mA analog output and RS485 Modbus digital communication.
How many operating modes does it have, and what are they?
Six: Indicator & Totalizer, Batcher (with halt and reject batch), Flow Comparator (two sensors, percentage recovery with low-recovery alarm), Rate Switch Mode (relay on low/high flow), Pulser (triggers on a preset volume) and Dual Totalizer (a second totalizer independent of totalizer 1).
Can it drive a dosing pump?
Yes. In Pulser mode the meter operates a specific task on completion of a preset volume and can be configured to any metering or dosing pump.
Can I totalize two different quantities at once?
Yes. The Dual Totalizer is a second totalizer that can be used regardless of the totalizer 1 settings.
Gallery
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Need help specifying the right instrument?
Tell us the fluid, line size and accuracy you need. Our engineers will recommend a configuration and quote it.