Key Benefits:
19 March 2006 (State 1 Er January 2013)
This Order fixes:
The following are subject to the provisions of this order:
For the purposes of this order:
Hot water meters shall meet the essential requirements set out in Schedule 1 of the Order on Measurement Devices and Schedule 1 of this Order.
The compliance of hot water meters with the essential requirements referred to in s. 4 may be evaluated and certified at the manufacturer's choice in accordance with one of the following procedures set out in Schedule 2 of the Ordinance on Measuring Instruments:
1 For hot water meters, the user may choose one of the following two procedures to ensure the maintenance of measurement stability:
2 Hot water meters used to determine the proportional distribution of energy costs are not subject to any procedures for maintaining measurement stability.
1 Thermal energy meters for liquids shall meet the essential requirements set out in Schedule 1 of the Order on Measurement Devices and Schedule 3 of this Order.
2 The superheated steam thermal energy meters shall meet the essential requirements set out in Schedule 1 of the Instrument for Measurement and Schedule 4 of this Order.
1 The conformity of thermal energy meters for liquids with the essential requirements referred to in Art. 7, para. 1, may be evaluated and certified at the selection of the manufacturer in accordance with one of the following procedures set out in Schedule 2 of the Ordinance on Measuring Instruments:
2 Thermal energy meters for superheated steam are subject to individual approval and an initial verification according to Annex 5 of the Ordinance on Measuring Instruments.
1 For thermal energy meters for liquids, the user may choose from the following procedures to ensure the maintenance of the stability of measurement:
2 For over-heated thermal energy meters, the user may choose one of the following two procedures to ensure the maintenance of measurement stability:
3 Thermal energy meters used to determine the proportional distribution of energy costs are not subject to any procedure for maintaining measurement stability.
Cold meters shall meet the essential requirements set out in 1 of the Order on Measurement Devices and Schedule 5 of this Order.
Cold meters are subject to regular approval and initial verification according to Annex 5 of the Ordinance on Measuring Instruments.
Cold meters shall be subjected to a subsequent verification every five years in accordance with Annex 7, c. 1, of the order on measuring instruments, carried out by an authorized verification laboratory.
The user assumes the responsibility specified in s. 21, para. 1, of the order on measuring instruments, but also the order:
1 The user maintains a control register of the measuring instruments used in his or her field of activity.
2 The register shall specify for each measuring instrument:
3 The energy consumers concerned and the bodies responsible for the enforcement of this order may consult the register at any time.
4 In case of disagreement, the Federal Institute of Metrology (METAS) 1 Decides whether the records meet the requirements.
The maximum permissible errors applicable in the challenge of results of measures within the meaning of Art. 29, para. 1, of the order on measuring instruments or in the official control of an instrument of measurement carried out outside the verification shall be the double of the maximum permissible errors for complete instruments fixed in Annexes 1, 3, 4 and 5 of the This order.
The Order of 21 May 1986 on Thermal Energy Meters 1 Is repealed.
1 [RO 1986 1121, 1997 2761 hp. II let.]
1 Hot water meters and thermal energy meters for liquids verified prior to the coming into force of this order may continue to be verified. At the time of the subsequent verification, meters shall comply with the maximum permissible errors in accordance with the previous provisions.
2 Hot water meters and thermal energy meters for liquids approved under the earlier right may be put into service and verified initially according to Annex 5, c. 2, of the order on instruments of measurement for ten years from the coming into force of this order. After the expiry of these ten years, they may still be verified at a later date.
3 Thermal energy meters for overheated steam and cold meters placed on the market prior to the coming into force of this order may be used without verification for five years after they are commissioned or revised.
4 Meters mentioned in para. 3 may be verified at a later date if they meet the requirements of this order.
5 Thermal energy meters and hot water meters used to determine the proportional distribution of energy costs may be placed on the market in accordance with the earlier provisions for five years from the entry In force of this Order.
This Order comes into force on October 30, 2006.
(art. 4)
Minimum Throughset (Q 1 )
The lowest flow rate for which the hot water meter displays results that meet the maximum tolerated error requirements.
Transient rate (Q 2 )
The rate between the stable flow and the minimum flow rate that is delineating two zones of the flow range, namely the upper and lower load extents to which different maximum tolerated errors apply.
Stable rate (Q 3 )
The maximum flow rate for which the hot water meter operates satisfactorily under normal conditions of use, that is, in stable or variable flow conditions.
Overload rate (Q 4 )
The maximum rate for which the meter operates satisfactorily, without disturbance, for a short time.
1 |
Nominal Operating Conditions |
2 |
Maximum Tolerable Errors |
3 |
Electromagnetic immunity |
4 |
Sustainability |
5 |
Adéquation |
6 |
Units of Measure |
(art. 6 and 9)
1 |
Monitoring of measuring instruments in service |
2 |
Calibration |
(art. 7, para. 1)
A thermal energy meter for liquids is either a complete meter or a combined meter consisting of the subsets "flow sensor", "pair of temperature sensors" and "unit of calculation" or a combination thereof.
Q |
= |
Temperature of the coolant; |
Q In |
= |
Value of Q At the inlet of the heat energy exchanger; |
Q Out |
= |
Value of Q Return of the heat energy exchanger; |
∆ Q |
= |
Temperature difference Q In - Q Out With ∆ Q ³ 0; |
Q Max |
= |
Upper limit of Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
Q Min |
= |
Lower limit of Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
∆ Q Max |
= |
Upper limit of ∆ Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
∆ Q Min |
= |
∆ lower limit Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
Q |
= |
The flow of the coolant; |
Q S |
= |
Upper value of q briefly allowable when the thermal energy meter is working properly; |
Q P |
= |
Maximum value of q allowed on a permanent basis when the thermal energy meter is working properly; |
Q I |
= |
Minimum value of q allowed when the thermal energy meter is working correctly; |
P |
= |
Heat power exchanged; |
P S |
= |
Upper limit of P allowed when the thermal energy meter is functioning properly. |
1 |
Nominal Operating Conditions |
2 |
Accuracy Classes |
3 |
Maximum Tolerable Errors for Full Thermal Energy Meters |
4 |
Electromagnetic immunity |
5 |
Sustainability |
6 |
Thermal Energy Meter Enrolment |
7 |
Subsets |
Debit sensor: |
- |
Class of accuracy; |
|
- |
Flow limit values; |
||
- |
Temperature limit values; |
||
- |
Pulse value (p. Ex. Litre/pulse) or corresponding output signal; |
||
- |
Indication of flow direction; |
||
Temperature Sensor Pair: |
- |
Sensor type (p. Ex. Pt 100); |
|
- |
Temperature limit values; |
||
- |
Temperature difference limit values; |
||
Calculation unit: |
- |
Type of temperature sensors; |
|
- |
Temperature limit values; |
||
- |
Temperature difference limit values; |
||
- |
Pulse value (p. Ex. Litre/pulse) or corresponding input signal emitted by the flow sensor; |
||
- |
Flow sensor mounting mode: input or return. |
(art. 7, para. 2)
An overheated steam thermal energy meter is a complete meter consisting of the subassemblies "flow sensor", "pair of temperature sensors" and "unit of calculation".
Q |
= |
Temperature of the coolant; |
Q In |
= |
Value of Q At the inlet of the heat energy exchanger; |
Q Out |
= |
Value of Q Return of the heat energy exchanger; |
∆ Q |
= |
Temperature difference Q In - Q Out With ∆ Q ³ 0; |
Q Max |
= |
Upper limit of Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
Q Min |
= |
Lower limit of Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
∆ Q Max |
= |
Upper limit of ∆ Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
∆ Q Min |
= |
∆ lower limit Q For the correct operation of the thermal energy meter within the limits of the maximum permissible errors; |
Q |
= |
Rate of the coolant; |
Q S |
= |
Maximum value of q briefly allowable when the thermal energy meter is functioning properly; |
Q P |
= |
Maximum value of q allowed on a permanent basis when the thermal energy meter is working properly; |
Q I |
= |
Minimum value of q allowed when the thermal energy meter is working correctly; |
P |
= |
Heat power exchanged; |
P S |
= |
Upper limit of P allowed when the thermal energy meter is functioning properly. |
1 |
Nominal Operating Conditions |
2 |
Maximum Tolerable Errors for Full Thermal Energy Meters |
3 |
Electromagnetic immunity |
4 |
Sustainability |
5 |
Thermal Energy Meter Enrolment |
(art. 10)
A cold meter is either a complete meter or a combined meter consisting of the subsets "flow sensor", "pair of temperature sensors" and "unit of calculation" or a combination thereof.
Q |
= |
Temperature of the coolant; |
Q In |
= |
Value of Q At the entrance to the cooling circuit; |
Q Out |
= |
Value of Q The return of the cooling circuit; |
∆ Q |
= |
Temperature difference Q In - Q Out With ∆ Q ≤0; |
Q Max |
= |
Upper limit of Q For the correct operation of the cold meter within the limits of the maximum permissible errors; |
Q Min |
= |
Lower limit of Q For the correct operation of the cold meter within the limits of the maximum permissible errors; |
∆ Q Max |
= |
Upper limit of ∆ Q For the correct operation of the cold meter within the limits of the maximum permissible errors; |
∆ Q Min |
= |
∆ lower limit Q For the correct operation of the cold meter within the limits of the maximum permissible errors; |
Q |
= |
Flow of the refrigerated liquid; |
Q S |
= |
Maximum value of q briefly allowable when the cold meter is working properly; |
Q P |
= |
Maximum value of q allowed on a permanent basis when the cold meter is functioning properly; |
Q I |
= |
Minimum value of q allowed when the cold meter is working correctly; |
P |
= |
Refrigerated cooling power |
P S |
= |
Upper limit of P allowed when the cold meter is working correctly. |
1 |
Nominal Operating Conditions |
2 |
Accuracy Classes |
3 |
Maximum toleration errors for complete cold meters |
4 |
Electromagnetic immunity |
5 |
Sustainability |
6 |
Enrolment on the cold meter |
7 |
Subsets |
Debit sensor: |
- |
Class of accuracy; |
|
- |
Flow limit values; |
||
- |
Temperature limit values; |
||
- |
Pulse value (p. Ex. Litre/pulse) or corresponding output signal; |
||
- |
Indication of flow direction; |
||
Temperature Sensor Pair: |
- |
Sensor type (p. Ex. Pt 100); |
|
- |
Temperature limit values; |
||
- |
Temperature difference limit values; |
||
Calculation unit: |
- |
Type of temperature sensors; |
|
- |
Temperature limit values; |
||
- |
Temperature difference limit values; |
||
- |
Pulse value (p. Ex. Litre/pulse) or corresponding input signal emitted by the flow sensor; |
||
- |
Flow sensor mounting mode: input or return. |
||
8 |
Normative documents |