Combined meter
Meitwin with GWFcoder® MP
Product categories
Combined meter with GWFcoder® MP counter for cold water up to 50 °C
Water
Drinking Water
Mechanical
Smart City
Your benefits
- Revolutionary multiprotocol interface (IEC and M-Bus in one meter):
Investment protection through meter interoperability - Transmission of the actual meter reading:
No data loss, ensuring reliable consumption billing - Battery-free operation:
Maintenance-free - Measurement from the lowest to the highest flow rates:
Improved cost efficiency - Removable measuring insert consisting of the main meter, bypass meter and changeover valve:
Ensures retrofit capability and easy replacement - One measuring insert for all housing sizes:
Reduced inventory costs
Applications
- Measurement of high, highly fluctuating flow rates, for example:
- Commercial and industrial facilities
- Schools and sports complexes
- Apartment buildings
- Hotels - Designed for pipeline dimensions specified for fire protection water demand
- Automated mobile or fixed-network reading of billing-relevant data
- Wired or wireless remote reading of difficult-to-access metering points, e.g. underground chambers
Options
- High-resolution HRI Pulse Transmitter
Documentation: HRI - RCM®-H200 Split Radio Modul
Documentation: RCM®-H200
Properties
- One of the widest measuring ranges available with defined low error limits.
Example: DN 80, Q₁ = 16 l/h, Q₃ = 120,000 l/h, measuring range 1:7500 - Universal installation position
- No upstream straight pipe section required
- Maximum operating pressure: PN 16
- Temperature up to 50 °C
- Hydrodynamically balanced main meter impeller
- Available in the standard installation lengths for Woltman (WS) meters
- Optimum corrosion protection by powder coating
- Starting flow rate approx. 2 l/h
- Common protective cover for the main and bypass meters
- Spring-loaded changeover valve with low pressure loss
- Minimum upstream pressure of 0.5 bar required
- SVGW certified
Complies with the European Measuring Instruments Directive (MID)- IP68 flood-proof main and bypass register with multiprotocol interface (MP), 5 m cable and one mounting position for an HRI pulse transmitter
- M-Bus standard load: 2 unit loads (3 mA)
Product information
Technical Data
| Manufacturer Specifications | ||||||
|---|---|---|---|---|---|---|
| Nominal diameter | DN | mm | 50 | 65 | 80 | 100 |
| Nominal pressure | PN | bar | 16 | 16 | 16 | 16 |
| Permanent flow rate | Q3 | m3/h | 50 | 70 | 120 | 180 |
| Overload flow rate (1 × 24 h) | Q4 | m3/h | 90 | 120 | 200 | 280 |
| Transition flow rate (±2%) | Q2 | m3/h | 0,012 | 0,012 | 0,012 | 0,012 |
| Minimum flow rate (±5%) | Q1 | m3/h | 0,006 | 0,006 | 0,006 | 0,006 |
| Changeover point (increasing flow rate) | m3/h | 2,0-2,6 | 2,0-2,6 | 2,0-2,6 | 2,0-2,6 | |
| Changeover point (decreasing flow rate) | m3/h | 1,1-1,7 | 1,1-1,7 | 1,1-1,7 | 1,1-1,7 | |
| Maximum temperature | max.°C | 50 | 50 | 50 | 50 | |
| Dimensions and weights | ||||||
|---|---|---|---|---|---|---|
| Installation length | L | mm | 270 | 300 | 300 | 360 |
| Height | H | mm | 287 | 287 | 287 | 287 |
| Height | h | mm | 80 | 92,5 | 100 | 100 |
| Measuring insert height | g | mm | 542 | 542 | 542 | 542 |
| Width | B | mm | 185 | 185 | 210 | 220 |
| Meter weight | approx. kg | 23 | 24,6 | 26,1 | 31 | |
| Measuring insert weight | approx. kg | 7 | 7 | 7 | 7 | |
| MID Approval | ||||||
|---|---|---|---|---|---|---|
| Permanent flow rate | Q3 | m3/h | 25 | 40 | 63 | 100 |
| Maximum temperature | max.°C | 30 | 30 | 30 | 30 | |
| Measuring range | R1600 | R2500 | R4000 | R6300 | ||
Dimensions
Materials
| Main meter housing | Cast iron |
| Bypass meter housing | Brass |
| Measuring insert | Plastic |
| Impeller | Plastic |
| Spring-loaded changeover valve | Plastic / Stainless steel |
Accuracy Curve
Pressure Loss Curve
Installation Positions
| Pipeline: | Horizontal |  |
| Vertical |  | |
| Meter register: | Facing upwards |  |
| Facing sideways |  |
Commissioning Note
When commissioning the meter, always fill the pipeline slowly with water to ensure gradual venting of the system.
Flow Direction
Pulse Value – HRI-Mei Pulse Transmitter
| DN 50...100 1 pulse = ... litres |
|
|---|---|
| Meitwin main meter | 100 1000 |
| Meitwin bypass meter | 1 10 |
GWFcoder®-Technology
In the GWFcoder®system, the individual rollers of the mechanical register are read out optoelectronically. The position of the various long asymmetrically arranged slits in the roller counters is scanned using five light barriers (lightpipe transmitter and receiver). The light barriers are implemented with phototransistors. LEDs and light conductors, which are all consecutively scanned and evaluated. The precisely defined position of each individual roller counter is encoded as an absolute roller counter reading and read out as a part of the protocol via the GWFcoder® interface. This functioning principle is patented by GWF. The GWFcoder® interface, compared to a meter with a pulse output, has an incomparably higher level of information content and readout accuracy. A GWFcoder® register does not require a battery, which, in turn, does not compromise existing revision cycles. The readout device supplies the power for the readout.
Moreover, all products with multiprotocol functionality provide the flexibility to switch between wall readout (inductive or CL), Wired M-Bus or radio readout which leads to an easy and fast «Plug & Play» installation on site.
GWFcoder®-Data package
| Medium | Water |
| Absolute meter reading | 123654 m3 |
| Serial number | 43215678 |
| Meter size | DN 50 |
M-Bus: EN 13757 --> Cable colors black / red, polarity independent
ECO: EN 13757-3 --> Cable colors black / green / red, note polarity
Example of use
Wireless read-out
Meter with GWFcoder® register is read out automatically by radio using a mobile infrastructure (for example radio module RCM®-H200 and MEx).
