The compact, single-jet impeller type meters (screw-type water meter) or multi-jet impeller meter (measuring capsule water meter) is used for drinking water (cold or hot) and consists of a flow element and a totalizer with LCD display.
In most cases, the single-pipe connection piece (EAT) is already present and embedded in the masonry.
The totalizer can be rotated 360° on the fitting.
The flow measuring section on the screw-type water meter is made of brass and includes a sieve at the input to collect larger dirt particles.
The water flows through the flow measuring section to drive the single-jet impeller. The speed is sampled inductively via coils to provide low wear and long-term stable measuring.
Incorrect direction of flow is detected and indicated by an error message on the display.
The resulting volume is added up, displayed and can be transmitted via RF to a data processing system. A long-life battery powers the processor for up to 10 years with 1 year of reserve capacity.
Dry rotor
The water meter is a dry rotor with high pressure resistance.
This prevents the totalizer from exposure to the medium and protects against dirt. The impeller has double bearings and the meter is protected against external magnetic influence to guarantee the highest accuracy and security under all installation conditions.
Infrared interface
The water meters can be read out on site via optical close-range interface. The meter is read out and configured with the WFZ.IRDA-USB optical reading head and associated configuration software.
Communications
The water meter sends parallel AMR and walk-by data telegrams in S-mode or C-mode. You can switch from S-mode to C-mode with the configuration software. RF is activated using the WFZ.PS tool, ACT50 software or automatically after consuming 50 liters.
The AMR telegrams are automatically collected and saved by a network node WTT662.. or WTT561... RF converter. The walk-by telegram can be collected during a walk by a the mobile data logger. The customer can remotely read out all plant consumption data.
Leakage detection
The meter generates an alarm if detects flow (between 4 and 5 liters per hour depending on the version) over a long period (factory setting of 24 hours).
A leak is indicated on the display by 'LEAC'. At the same time, an error message is transmitted via RF.
The threshold value can be adapted to between 1 and 24 hours using the configuration software.
Tampering
The meters are tested against electromagnetic and magnetic disturbances per EN ISO 4064-2.
Function check
The flow is acquired continuously. The volume is displayed in real time. Any errors are immediately displayed. Meters conducted the following self-tests:
- Leakage detection
- Reverse flow
- Error detection
Display
Water consumption is continuously cumulated. The current state is stored at 11:59 PM am on the next due date.
The due date is factor set to 31.12, but can be configured with the ACT50 software.
The water meter calculates a checksum when saving the annual consumption. Self-readers can notify the responsible office together with the read out on the due date to verify the correct read out of the display. The stored due date remains in place for one year.
The water meter has a display loop. The following data can be read from the water meter's displayr:
- Error code
- Error date
- Current total consumption
- Due date
- Due date value
- Checksum
- RF mode
| These segments appear only when a device fault occurs. |
They can be individually activated or deactivated with the configuration software. |
The following parameters can be read out and/or configured using the configuration software via the IrDA interface:
Read out only:
General
- Serial number
- Mounting place
- SW version
- Medium
- Commissioning date
- Battery life
- Order number
- Leakage detection
- Device date
- Error date
- Error code
Device information
- Device name/password
- Current flow rate
Meter states
- Current meter state
- Reverse volume indication
- Last due date
- Meter state on last due date
- Next due date
- Maximum flow rate
- Leakage
Statistical values
- 13 monthly values
RF settings
- RF mode
- RF system
- Walk-by readout type (S-mode only)
- Walk-by transmission delay (S-mode only)
- Walk-by transmission timeframe (S-mode only)
- Walk-by transmission-free days (S-mode only)
Configuration:
General
- Mounting place
- Display loop
- Leakage detection
Due date
- Next due date
Device information
- Device name/password
RF settings
- RF mode
- RF system
- Walk-by readout type (S-mode only)
- Walk-by transmission delay (S-mode only)
- Walk-by transmission timeframe
- Walk-by transmission-free days (S-mode only)
Error messages
Error code | Error description | Measures/notes |
|---|---|---|
LEAC | Leakage in the system | Check piping, eliminage leakage. |
0 | Flow direction negative | Check meter installation / flow direction |
2 | Operating hours expired | Replace the device during the next service appointment. |
3 | Hardware error | Replace the device! |
4 | Permanently stored errorr | Replace the device! |
b | Communicated too much in the month via OPTO | The lock is automatically lifted each month! |
d | Too much flow | Check installation conditions! |
f | The device lost powered for a short period. | Replace the device! |