Power supply

Battery type

3 V lithium battery

Battery life

Up to 10 years ¹ + reserve

¹ Battery life up to 10 years as of commissioning. Actual battery life depending on operating state and external factors.

 

Functional data

RF:

Radio frequency

  • S-mode
  • C-mode

 

868.30 +/- 0.30 MHz

868.95 +/- 0.25 MHz

Transmitting power:

  • S-mode
  • C-mode

 

Typical 2.5 dBm, max. 14.0 dBm

Typical 7.3 dBm, max. 14.0 dBm

RF protocol

Wireless M-bus per EN 13757-4

Measuring principle:

One- or two-sensor devices

Field of application 1):

  • One-sensor WHE3x algorithm
  • One-sensor WHE4x algorithm

tmin,m = 55°C, tmax,m = 105 °C

tmin,m = 55 °C, tmax,m = 105 °C

  • Two-sensor WHE3x algorithm
    • Standard scale:
    • Scaled:
  • Two-sensor WHE4x algorithm

 

tmin,m = 48 °C, tmax,m = 105 °C

tmin,m = 35 °C, tmax,m = 105 °C

tmin,m = 35 °C, tmax,m = 105 °C

Start of metering: (tZ refers to the temperature of heating medium determined)

  • One-sensor devices

tZ ≥ 30 °C (at tL = 20 °C) unevaluated

tZ ≥ 28 °C (at tL = 20 °C) evaluated

  • Two-sensor devices

tZ - tL ≥ 5 K

1) Definitions according to DIN EN 834:

tmin,m: Lowest mean design heating medium temperature at which the heat cost allocator may be used. With single-tube heating systems this is the mean design heating medium temperature of the last radiator in the line

tmax,m: Highest mean design heating medium temperature at which the heat cost allocator may be used

tZ: Mean heating medium temperature of the radiator at which the counter of the heat cost allocator starts up

tL: Reference air temperature

tm: Mean heating medium temperature

 

Degree of protection

Protection class

III as per EN 61140

Protection degree of housing

IP43 per EN 60529

 

Ambient conditions

 

Running

Transportation

Storage

Temperature

5...70 °C

-25...+70 °C

-5...+45 °C

Humidity

<95% r.h. (non-condensing)

 

Directives and standards

Product standard

DIN EN 834

Heat cost allocator to acquire consumption data for room heating areas

EU conformity (CE)

See EU declaration of conformance *)

Environmental compatibility

The product environmental declaration *) contains data on environmentally compatible product design and assessments (RoHS compliance, material composition, packaging, environmental benefit, and disposal).

*) Documents can be downloaded at http://www.siemens.com/bt/download.

 

Material

Dimensions

40 x 102 x 31 mm (W x H x D)

Sensor cable length

2.5 m

Weight

58 g

Housing material

ABS + PC

Housing colors

RAL 9016 traffic white