The heat cost allocators are classified as follows based on type of communication:
- No communication interface
- With optical communication interface (optional)
- With RF interface
No communication interface
Heat cost allocators without communication interface WHE50.. must be read visually on site and the measuring results must be manually recorded. They are especially suited for systems that do not require complex data evaluations or particularly fast readout processes.
With optical communication interface
The heat cost allocator with optical communication interface can be read on site using an infrared adapter and a suitable computer and the data can be archived for later evaluation.
With RF interface
Wireless heat cost allocators send parallel AMR and walk-by data telegrams in S-mode or C-mode. AMR telegrams comply with OMS in C-mode.
Walk-by
The heat cost allocators are read locally via radio. They transmit consumption data at the set reading time. The reads collects the RF telegrams using a mobile readout tool ¹). The meter-reader does not have to enter the user’s residence or office.
In the case of smaller plants, the data can usually be collected from outside the building.
AMR
Heat cost allocators transmit the current consumption data in cycles to network nodes. They automatically collect the data of all integrated heat cost allocators and store them. The customer can remotely read out all plant consumption data.
Readout parameters
The heat cost allocators transmit the following parameters via RF:
- Device number (8 digits)
- Type of device/software version version
- Time of day/date
- Error status
- Error date
- Current consumption
- Due date
- Due date value
- Counter reading at end of last month
- 13 monthly values (only for walk-by)
¹) In development: Mobile readout tool WTT726-FE7300 and Readout and parameterization app ACT60
Tampering
Heat cost allocator are equipped with a factory installed lead seal.
Any unauthorized device opening is registered, shown on the display (WHE50..) and transmitted via radio (WHE5.. / WHE6..).
Function check
Heat cost allocators perform a self-test every 4 minutes. An error message "Err x" is displayed if the error lasts for 5 consecutive measuring cycles (20 minutes).
After the error has been registered and shown on the display, the device stops measuring. The date the error occurred is stored internally.
Display device type
Device states, consumption values and measuring system information are displayed in a loop.
Display loops in normal mode | ||
|---|---|---|
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Current consumption |
| 2 s |
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Display test: Everything on |
| 0.5 s |
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Display test: Everything off |
| 0.5 s |
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Due date For example, December 31 |
| 2 s |
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Due date value |
| 5 s |
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Checksum |
| 2 s |
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These displays steps are only visible if a product scale is added to the WHE5..: | ||
kQ value corresponds to the radiator rated capacity in W |
| 1 s |
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kC value Evaluation factor that considers the thermal coupling of the temperature sensor |
| 1 s |
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Variable display |
| 1 s |
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Sleep mode
Devices are factory set to sleep mode. Measuring operation inactive.
Display loop sleep mode | ||
|---|---|---|
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Sleep mode Measuring operation inactive |
| 2 s |
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Due date For example, December 31 |
| 2 s |
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Variable display |
| 2 s |
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| FS = Code for walk-by and AMR FC = Code for walk-by and AMR AL = Algorithm, no RF system available | |
| 3 = Code for WHE3x algorithm 4 = Code for WHE4x algorithm | |
| 1 = Code for one-sensor measuring system 2 = code for two-sensor measuring system | |
Special displays
Error messages |
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"Err 1" appears constantly. All other error messages are displayed in quick succession alternating with consumption values. |
| 0.5 s |
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Consumption display suppressed |
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Is displayed in the event of an error in place of invalid consumption values base on the setting. |
| 0.5 s |
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End of battery life |
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Is displayed after the end of service life, alternating with the consumption values based on the setting. |
| 0.5 s |
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Tampering or housing opening |
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Is displayed in the event of tampering either as clear text, alternating with the consumption values, or by the indicator "c" shown discretely on all displays based on the setting. |
Clear text | 0.5 s | |
Example: Display "current value" with "c". |
Discrete | 0.5 s | |
Data interface (IrDA close range interface) |
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This display indicates an active close-range interface. |
| 10 s | |
Radio system activated (AMR/walk-by) S-mode: Walk-by and AMR C-mode: Walk-by and AMR |
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The transmission of installation telegrams is indicated on this display. Display sequence: InSt8, InSt7, ... InSt1 |
| 30 s | |
Commissioning |
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This display appears after snapping the device onto the mounting plate. The display then changes to the normal mode display loop. |
| 3 s | |
Remote sensor identification |
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The meter has detected a remote sensor and adjusts its measuring behavior accordingly. |
| 3 s | |
