Rs 941.231 Order Of The Fdjp On March 19, 2006 On Thermal Energy Measuring Instruments

Original Language Title: RS 941.231 Ordonnance du DFJP du 19 mars 2006 sur les instruments de mesure de l’énergie thermique

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941.231 order of the FDJP on the measuring instruments of the thermal energy of March 19, 2006 (Status January 1, 2013) the federal Department of justice and police (FDJP), view the art. 5, al. 2, 8, al. 2, 11, al. 2, 16, al. 2: 17, al. 2: 24, al. 3, and 33 of the Ordinance of 15 February 2006 on measuring instruments (Ordinance on measuring instruments), stop: Section 1 provisions general art. 1 purpose this fixed order: a. requirements for hot water, ener-gie thermal counters and the counters of cold; b. the procedures for placing on the market of these measuring instruments; c. the procedures to maintain the stability of these measuring instruments measure.

Art. 2 scope of application are subject to the provisions of the Ordinance: a. hot water meter designed to measure volumes of hot water that are used in households, arts and crafts or light industry; b. the thermal energy meters and meters of cold which are intended to determine energy costs and which are used in households arts and crafts or light industry.

Art. 3 definitions for the purposes of this order, means: a. hot water meter: a measuring instrument which determines the amount of running water, heating or sanitary water whose temperature exceeds 30 ° C; b. thermal energy meter: an instrument to measure heat energy released in a circuit of heat exchange with a coolant (water or overheated steam); c. cold counter : an instrument to measure the thermal energy removed from the water in a cooling circuit water.

Section 2 hot water meters art. 4 essential requirements hot water meter must meet the essential requirements laid down in Schedule 1 of the Ordinance on measuring instruments and in annex 1 of this order.

Art. 5 procedures for placing on the market the compliance of meters of hot water with the essential requirements referred to in art. 4 can be evaluated and certified at the choice of the manufacturer according to one of the following procedures set out in annex 2 of the Ordinance on measuring instruments: a. type examination (module B) supplemented by the declaration of conformity to type based on the quality of the manufacturing process (module D) insurance; b. type examination (module B) supplemented by the declaration of conformity to type based on product (module F); c. statement of compliance based on insurance full quality and control of design (module H1).

Art. 6 procedures of maintaining stability of measurement for hot water, the user can choose one of the following two procedures intended to ensure the maintenance of the stability of measurement: a. check later according to annex 7, point 1, of the Ordinance on measuring instruments, carried out every five years by a verification laboratory authorized; b. monitoring of measures in service according to annex 7 , point 3, of the Ordinance on the measuring instruments and in accordance with the requirements in annex 2, ch. 1 of this order.

Hot water meters used to determine the apportionment of energy costs are subject to no procedure for maintaining the stability of measurement.

Section 3 thermal energy meters art. 7 essential requirements for liquids thermal energy meter must meet the essential requirements laid down in Schedule 1 of the Ordinance on measuring instruments and in annex 3 of this order.
For superheated steam thermal energy meter must meet the essential requirements laid down in Schedule 1 of the Ordinance on measuring instruments and in annex 4 of this order.

Art. 8 procedures for placing on the market the compliance of meters of thermal energy for liquid with the essential requirements referred to in art. 7, al. 1, can be evaluated and certified at the choice of the manufacturer according to one of the following procedures set out in annex 2 of the Ordinance on measuring instruments: a. type examination (module B) supplemented by the declaration of conformity to type based on the quality of the manufacturing process (module D) insurance; b. type examination (module B) supplemented by the declaration of conformity to type based on product (module F); c. statement of compliance based on insurance full quality and control of design (module H1).

For superheated steam thermal energy meters are subject to individual approval and initial verification according to annex 5 of the Ordinance on measuring instruments.

Art. 9 procedures for maintaining stability of measurement for the counters of heat for liquids, the user can choose from the following procedures designed to ensure the maintenance of the stability of measurement: a. check later according to annex 7, point 1, of the Ordinance on measuring instruments, carried out every five years by a verification laboratory authorized; b. monitoring of measures in service according to annex 7 , point 3, of the Ordinance on the measuring instruments and in accordance with the requirements laid down in annex 2, section 1 of this order; c. calibration according to annex 7, ch. 6, of the Ordinance on the measuring instruments and in accordance with the requirements in annex 2, ch. 2, of this order.

For superheated steam heat energy meter, the user can choose one of the following two procedures intended to ensure the maintenance of the stability of measurement: a. audit later according to annex 7, point 1, of the Ordinance on measuring instruments, performed every five years by a verification laboratory authorized; b. calibration according to annex 7, Chapter 6, of the Ordinance on the measuring instruments and in accordance with the requirements laid down in annex 2 , no. 2 of this order.

The thermal energy meter used to determine the apportionment of energy costs are subject to no procedure for maintaining the stability of measurement.

Section 4 meters of cold art. 10 essential requirements cold counters must meet the essential requirements laid down in the annex year 1 of the Ordinance on the measuring instruments and in Appendix 5 of this order.

Art. 11 procedures for placing on the market the cold counters are subject to regular approval and initial verification according to annex 5 of the Ordinance on measuring instruments.

Art. 12 procedures for maintaining measurement stability cold counters must undergo every five years a subsequent audit according to annex 7, point 1, of the Ordinance on measures, carried out by a verification laboratory authorized.

Section 5 Obligations of the user art. 13 mounting, commissioning and maintenance of the measuring instrument the user assumes the responsibility specified in art. 21, al. 1, of the Ordinance on measuring instruments, but also: a. to respect the instructions of the manufacturer for the installation and commissioning of the measuring instrument; (b) to keep the measuring instrument in good condition and to review periodically the parts subject to wear and tear, aging, or fouling.

Art. 14 control registers the user maintains a register of control of the measurement tools used in its field of activity.
The register must state for each measuring instrument: a. when and what procedure it has been on the market; (b) which maintain the stability of measurement procedure is prescribed; c. when maintaining stability of measurement procedure has been applied for the last time; d. where it is in service.

Energy consumers concerned and the bodies responsible for the implementation of this order may consult the register at any time.
In case of disagreement, the federal Institute of Metrology (METAS) decides if the records meet the requirements.

The name of the administrative unit has been adapted to 1 Jan. 2013 in application of art. 16 al. 3 o from 17 nov. 2004 on official publications (RS 170.512.1). This mod has been taken throughout the text.

Section 6 maximum errors allowed the checks of art. 15. the tolerated maximum errors applicable during the contestation of results of measures within the meaning of art. 29, al. 1, of the Ordinance on the instruments of measurement or during official controls of a measuring instrument outside the audit are twice the maximum errors allowed for complete instruments attached to annexes 1, 3, 4 and 5 of this order.

Section 7 provisions final art. 16 repeal of the law in force the order of 21 May 1986 on the thermal energy meter devices is repealed.

[RO 1986 1121, 1997 2761 ch. II let. e]

Art. 17 transitional provisions hot water meters and meters of thermal energy for fluids checked before the entry into force of this order may continue to be checked. During the subsequent audit counters must respect the maximum errors permitted in accordance with the previous provisions.

Hot water meters and meters of thermal energy for liquid approved according to the earlier right can be implemented and verified initially according to annex 5, section 2, of the Ordinance on measuring instruments for ten years from the entry into force of this order. After the expiry of those ten years, they can be checked later.
For superheated steam thermal energy meters and meters of cold put on the market before the entry into force of this order can be used without verification for five years after their commissioning or their revision.
The counters mentioned in para. 3 can be checked at a later date if they meet the requirements of this order.
Thermal energy meters and hot water meters used to determine the proportional distribution of the energy costs can be placed on the market in accordance with the previous provisions for five years from the entry into force of this order.

Art. 18 entry into force this order comes into force on October 30, 2006.

Annex 1 (art. 4) specific requirements for water meter hot A Definitions minimum flow (Q1) the lowest rate for which the hot water meter displays results that meet the requirements of maximum permissible errors.
Transitional flow (Q2) including flow between the stable and minimum rates of flow which delineates two areas of the flowrate range, namely the areas upper and lower load which apply different maximum permissible errors.
Stable flow rate (Q3) maximum flow for which the hot water meter works satisfactorily under normal conditions of use, i.e. under steady or variable flow conditions.
Flow of overload (Q4) maximum flow for which the meter is running satisfactorily, without disruption, for a brief moment.

B metrological requirements 1 nominal operating Conditions 1.1 the manufacturer shall specify the rated operating conditions for the scope of hot water flow. The flowrate range values must meet the following conditions: - Q3/Q1³ 10; - Q2/Q1 = 1,6; - Q4/Q3 = 1,25.

During the five years following the entry into force of this order, the Q2/Q1 report can have the values 1.5; 2.5; 4 or 6,3.
1.2 the manufacturer shall specify the rated operating conditions for the scope of hot water temperature. The extent of temperature should range from 30 ° C to at least 90 ° C.
1.3 the manufacturer shall specify the rated operating conditions for the relative hot water pressure range. The relative pressure range must be 0.3 bar to at least 10 bars for Q3.
1.4 the manufacturer shall specify the rated operating conditions for power supply: AC power supply nominal values and/or values limits supply current continuous.

2 maximum tolerated errors 2.1 the maximum errors tolerated, positive or negative, are 3% on the volumes supplied output between transitional flow (Q2) (included) and the overload (Q4).2.2 flow maximum errors tolerated, positive or negative, are 5% of the volumes provided for flow rates between the minimum flow (Q1) and the transitional flow (Q2) (excluded).

3 electromagnetic immunity 3.1 an electromagnetic disturbance can influence the hot water meter that:-If the change in the result of the measurement is not the limit in point 3.3 value, or if the indication of the result of the measurement is such that it can not be considered as valid, as is the case during a brief fluctuation, which cannot be nor interpreted , recorded or transmitted as a result of the measure.

3.2 after undergoing an electromagnetic disturbance, the hot water meter shall: - resume operation within the maximum errors allowed; - have all its insured measurement functions, and - to recover all available measurement data just before the disturbance.

3.3 the limit value is the smaller of the following two values: - the volume which corresponds to half of the maximum error tolerated on the volume measured to the upper extent of charge; - the volume which corresponds to the maximum error tolerated for the volume who transited in a minute to flow Q3.

4 sustainability 4.1 has the outcome of a review of appropriate control carried out taking into account the deadlines proposed by the manufacturer, the following criteria must be filled: 4.2 at the end of the durability test, the variation of the measurement compared with the initial measurement result shall not exceed the following values: - ± 3% of the volume measured between (inclusive) Q1 and Q2 (excluded); - ± 1.5% of the volume measured between (inclusive) Q2 and Q4 (included).

4.3 the deviation of measurement for the volume measured after the durability test may not exceed the following values: - ± 6% of the volume measured between (inclusive) Q1 and Q2 (excluded); - ± 3,5% of the volume measured between (inclusive) Q2 and Q4 (included).

5 matching 5.1 unless otherwise stated, the meter must be able to be used in all the positions.5.2 the manufacturer shall specify whether the meter is designed to measure reverse flow. If this is the case, the reverse flow volume should be either subtract the accumulated volume or seized separately. The maximum permissible error is the same for normal flow and inverse.5.3 flow hot water meters which are not designed to measure reverse flow shall either stop them or withstand an accidental reverse flow without damage or modification of their metrological characteristics.

6 units of measurement the display of the measured volume must be in m.

State on January 1, 2013 Appendix 2 (arts. 6 and 9) Procedures for maintaining the stability of measurement for hot water meter and thermal energy meter 1 monitoring of measures in service if the user makes use of at least 150 meters of hot water and thermal energy meters, it can apply to METAS procedure allowing to extend the period of verification under the following conditions : - the procedure should ensure by appropriate measures to correct measurements; - all hot water meters and in-service thermal energy meter must have been placed on the market pursuant to art. 5 or 8 of this order, and none of these counters, at any time, can be in service for more than ten years without having undergone a subsequent audit according to annex 7, point 1, of the Ordinance on measuring instruments - defective meters need to be replaced by compliant counters - all meters in service must be operated under comparable conditions; - the user informs METAS once a year of the results of the procedure.

2 calibration if the rated power of the installation of measurement of thermal energy is less than 10 MW, the user can choose the calibration according to annex 7, ch. 6, of the Ordinance on measuring instruments for the maintenance of the stability of measurement if the following conditions are met:-the exchange of heat takes place via fixed lines between two permanent partners the amount supplied being determined in a measuring station on the basis of the data provided by one or more meters of thermal energy with the sum of the ratings of at least 10 MW;-installation of heat energy measure is implemented between two trading partners who are both able to judge the results measures; - installation of thermal energy is subject to regular operating qualified; personnel metrological surveillance - if parts installation of measure cannot be calibrated in the company, the calibration of the measuring instruments is performed by a laboratory recognized by METAS, by a laboratory authorized audit or by METAS. Installation of thermal energy is leaded in identifiable way after calibration; - installation of heat energy measurement is calibrated according to the needs, but as a general rule every 12 months. The validity of the calibration of each of the parts of the installation of measurement may not exceed two years; - all the work (maintenance, adjustment, calibration) on the installation of measurement of thermal energy are recorded in a minutes. The data collected must identify what work was done, when and by whom. If challenged, the minutes must be submitted to the competent body.

State on January 1, 2013 Appendix 3 (art. 7, para. 1) specific requirements for meters of thermal energy for liquid A Definitions a liquid thermal energy meter is either a complete meter or a combined counter composed of subsets 'flow sensor', 'pair of temperature sensors' and 'unit' or a combination of these.

q = temperature of the liquid coolant.

Qin = value of q at the entrance of the heat exchanger;

taste = q value for the return of the heat exchanger;

∆q = difference in temperature qin - taste with ∆q³ 0;

Qmax =


upper limit of q for a correct operation of the meter of thermal energy within the limits of the maximum permissible errors;

Qmin = lower limit of q for a correct operation of the meter of thermal energy within the limits of the maximum permissible errors;

∆Qmax = upper limit of ∆q for proper operation of the meter of thermal energy within the limits of the maximum permissible errors;

∆Qmin = lower limit of ∆q for proper operation of the meter of thermal energy within the limits of the maximum permissible errors;

q = flow of the coolant.

QS = upper value of q briefly eligible when the thermal energy meter working properly;

PS = maximum value of q admitted steady when the thermal energy meter working properly;

Qi = minimum value of q admitted when the thermal energy meter is working properly.

P = power exchanged.

PS = upper limit of P admitted when the thermal energy meter is working properly.

B metrological requirements 1 nominal operating Conditions 1.1 the manufacturer shall specify the rated operating conditions for the temperature of the liquid: qmax, qmin.1.2 the manufacturer shall indicate the nominal operating conditions for the difference in temperature of the liquid: ∆qmax, ∆qmin, the following limitations are imposed: ∆qmax/∆qmin³ 10; ∆Qmin = 3 K or 5 K or 10 K.1.3 the manufacturer shall indicate the nominal operating conditions for the flow of the liquid: qs, qp, qi, the following limitation being imposed on the values of qp and qi: qp/qi³ 10.1.4 the manufacturer shall specify the rated operating conditions for the heat output: Ps.

2 classes of accuracy the following accuracy classes are set for thermal energy meters: 1-2-3.

3 maximum errors allowed for complete thermal energy meters errors maximum tolerated for comprehensive thermal energy meter expressed in percent of the true value for each accuracy class include:-E = Ef + and + Ec.
EF, and Ec are defined in points 7.1 to 7.3.

4 4.1 electromagnetic immunity the measuring instrument must not be influenced by static magnetic field or by an electromagnetic field to the reseau.4.2 frequency electromagnetic disturbance can influence the thermal energy meter only:-If the change in the measurement result does not exceed the limit in point 4.3 value, or if the indication of the result of the measurement is such that it cannot be considered valid.

4.3 the value limits for counters full thermal energy is equal to the absolute value of the maximum permissible error fixed for this ener-gie heat meter (see ch. 3).

5 sustainability 5.1 has a review of appropriate control carried out taking into account the deadlines proposed by the manufacturer, the following criteria must be filled: 5.2 flow sensors: at the end of the durability test, the variation of the measurement compared with the initial measurement result must not exceed limite.5.3 temperature sensors: at the end of the durability test the values measured must not differ from the initial values of more than 0.1 ° C.

6 entries on the thermal energy meter - class accuracy;
-limits of flow - temperature limit values; - limits of temperature difference; - the flow sensor installation location: entry or return; - indication of the direction of flow.

7 subsets subsets provisions may apply to sub-assemblies manufactured by one or by several manufacturers. The essential requirements for thermal energy meters if necessary also apply to subsets. The following additional requirements are applicable: 7.1 maximum permissible error relative to the flow sensor expressed in % in accuracy classes:-class 1: Ef = (1 + 0,01 qp/q), but not more than 5%; - class 2: Ef = (2 + 0.02 qp/q), but not more than 5%; - class 3: Ef = (3 + 0,05 qp/q), but not more than 5%.

EF corresponds to the difference between the value and the true value of the relationship between flow sensor output signal and the mass or volume.
7.2 maximum permissible error relative to the pair of sensors of temperature, expressed in %:- and = (0,5 + 3 · ∆qmin/∆q).
And corresponds to the difference between the value and the true value of the relationship between the output signal of the pair of temperature sensors and temperature difference.
7.3 maximum permissible error relative to the calculating unit expressed in %:-Ec = (0,5 + ∆qmin/∆q).
EC is the difference between the value of the specified thermal energy and the true value.
7.4 the limit value for a subset of a heat meter is equal to the absolute value of the maximum error tolerated for the subset (see Chapter 7.1, 7.2 or 7.3).7.5 Inscriptions on the sub-assemblies flow sensor:-accuracy class;

-limits of flow rate;

-limits of temperature;

-Pulse value (e.g. litres/pulse) or corresponding output signal;

-indication of the direction of flow;

Pair of temperature sensors:-type of sensor (e.g. Pt 100);

-limits of temperature;

-limits of temperature difference;

Arithmetic unit:-type of temperature sensors;

-limits of temperature;

-limits of temperature difference;

-Pulse value (e.g. litres/pulse) or corresponding input signal emitted by the flow sensor;

-mode of the flow sensor installation: Enter or return.

State on January 1, 2013 Appendix 4 (art. 7, para. 2) specific requirements for counters of heat energy for superheated steam A Definitions a for superheated steam thermal energy meter is a full meter of subsets 'flow sensor', "pair of temperature sensors" and "unit of calculation".

q = temperature of the coolant.

Qin = value of q at the entrance of the heat exchanger;

taste = q value for the return of the heat exchanger;

∆q = difference in temperature qin - taste with ∆q³ 0;

Qmax = upper limit of q for a correct operation of the meter of thermal energy within the limits of the maximum permissible errors;

Qmin = lower limit of q for a correct operation of the meter of thermal energy within the limits of the maximum permissible errors;

∆Qmax = upper limit of ∆q for proper operation of the meter of thermal energy within the limits of the maximum permissible errors;

∆Qmin = lower limit of ∆q for proper operation of the meter of thermal energy within the limits of the maximum permissible errors;

q = flow of the coolant.

QS = maximum value of q briefly eligible when the thermal energy meter working properly;

PS = maximum value of q admitted steady when the thermal energy meter working properly;

Qi = minimum value of q admitted when the thermal energy meter is working properly.

P = power exchanged.

PS = upper limit of P admitted when the thermal energy meter is working properly.

B metrological requirements 1 nominal operating Conditions 1.1 the manufacturer shall specify the rated operating conditions for the temperature of the coolant: qmax, qmin.1.2 the manufacturer shall indicate the nominal operating conditions for the difference in temperature of the coolant: ∆qmax, ∆qmin.1.3 the manufacturer shall indicate the nominal operating conditions for the flow of superheated steam: qs, qp, qi.1.4 the manufacturer shall indicate the nominal operating conditions for the heat : Ps.

2 maximum errors allowed for complete thermal energy meter errors maximum tolerated for comprehensive thermal energy meter expressed in percent of the true value are the following:-E = 4 + 4 · ∆Qmin/∆q + 0.05 qp/q, but at least E = 6 + 4 · ∆Qmin/∆q.

3 electromagnetic immunity 3.1 the measuring instrument must not be influenced by static magnetic field or by an electromagnetic field to the reseau.3.2 frequency electromagnetic disturbance can influence the thermal energy meter only:-If the change in the measurement result does not exceed the limit in point 3.3 value, or if the indication of the result of the measurement is such that it cannot be considered valid.

3.3 the value limits for counters full thermal energy is equal to the absolute value of the maximum permissible error fixed for this thermal energy meter (see ch. 2).

4 sustainability as A result of a review of appropriate control carried out taking into account the deadlines proposed by the manufacturer, the variation of the measurement result compared with the initial measurement result must not exceed the maximum permissible errors (see ch. 2).

5 entries on the thermal energy meter - limits of flow;
-limits of temperature; - limits of temperature difference; - the flow sensor installation location: entry or return; - indication of the direction of flow.

State on January 1, 2013 Appendix 5 (art. 10)


Specific requirements for cold counters A Definitions a cold meter is either a complete meter or a combined counter composed of subsets 'flow sensor', 'pair of temperature sensors' and 'unit' or a combination of these.

q = temperature of the liquid coolant.

Qin = value of q at the entrance of the cooling circuit.

taste = q value for the return of the cooling circuit.

∆q = difference in temperature qin - taste with ∆q ≤0.

Qmax = upper limit of q for a correct operation of the meter of cold within the limits of the maximum permissible errors;

Qmin = lower limit of q for a correct operation of the meter of cold within the limits of the maximum permissible errors;

∆Qmax = upper limit of ∆q for proper operation of the meter of cold within the limits of the maximum permissible errors;

∆Qmin = lower limit of ∆q for proper operation of the meter of cold within the limits of the maximum permissible errors;

q = flow of the liquid coolant.

QS = maximum value of q briefly eligible when the cold counter works properly;

PS = maximum value of q admitted steady when the cold counter works properly;

Qi = minimum value of q admitted when the cold counter works correctly.

P = exchanged cooling power;

PS = upper limit of P admitted when the cold counter works correctly.

B metrological requirements 1 nominal operating Conditions 1.1 the manufacturer shall specify the rated operating conditions for the temperature of the coolant liquid: qmax, qmin.1.2 the manufacturer shall indicate the nominal operating conditions for the difference in temperature of the liquid coolant: ∆qmax, ∆qmin.1.3 the manufacturer shall indicate the nominal operating conditions for the flow of the liquid: qs, qp , IQ, the values of qp and qi are limited as follows: qp/qi ³ 10.1.4 the manufacturer shall specify the rated operating conditions for the cooling power: Ps.

2 classes of accuracy the following accuracy classes are set for cold counters: 2 3.

3 maximum errors allowed for complete cold counters errors maximum tolerated for complete cold counters expressed in percent of the true value are the following for each class of accuracy:-E = Ef + and + Ec.
EF, and Ec are defined in points 7.1 to 7.3.

4 4.1 electromagnetic immunity the measuring instrument must not be influenced by static magnetic field or by an electromagnetic field to the reseau.4.2 frequency electromagnetic disturbance can influence the cold counter only:-If the change in the measurement result does not exceed the limit in point 4.3 value, or if the indication of the result of the measurement is such that it cannot be considered valid.

4.3 the limit value for the complete cold counters is equal to the absolute value of the maximum permissible error fixed for this cold counter (see Chapter 3).

5 sustainability 5.1 has a review of appropriate control carried out taking into account the deadlines proposed by the manufacturer, the following criteria must be filled: 5.2 flow sensors: at the end of the durability test, the variation of the measurement result compared with the initial measurement result must not exceed limite.5.3 temperature sensors : at the end of the durability test, the variation of the measurement result compared with the initial measurement result must not exceed 0.1 ° C.

6 entries on the cold counter - class accuracy;
-limits of flow - temperature limit values; - limits of temperature difference; - the flow sensor installation location: entry or return; - indication of the direction of flow.

7 subsets subsets provisions may apply to sub-assemblies manufactured by one or by several manufacturers. The essential requirements for cold counters if necessary also apply to subsets of cold counters. The following additional requirements shall apply: 7.1 maximum permissible error relative to the flow sensor expressed in % in accuracy classes:-class 2: Ef = (2 + 0.02 qp/q), but not more than 5%; - class 3: Ef = (3 + 0,05 qp/q), but not more than 5%.

EF corresponds to the difference between the value and the true value of the relationship between flow sensor output signal and the mass or volume.
7.2 maximum permissible error relative to the pair of sensors of temperature, expressed in %:- and = (0,5 + 3 · ∆qmin/∆q).
And corresponds to the difference between the value and the true value of the relationship between the output signal of the pair of temperature sensors and temperature difference.
7.3 maximum permissible error relative to the calculating unit expressed in %:-Ec = (0,5 + ∆qmin/∆q).
EC is the difference between the value of the thermal energy and the true value.
7.4 the limit value for a subset of a cold counter is equal to the absolute value of the maximum error tolerated for the subset (see Chapter 7.1, 7.2 or 7.3).7.5 Inscriptions on the sub-assemblies flow sensor:-accuracy class;

-limits of flow rate;

-limits of temperature;

-Pulse value (e.g. litres/pulse) or corresponding output signal;

-indication of the direction of flow;

Pair of temperature sensors:-type of sensor (e.g. Pt 100);

-limits of temperature;

-limits of temperature difference;

Arithmetic unit:-type of temperature sensors;

-limits of temperature;

-limits of temperature difference;

-Pulse value (e.g. litres/pulse) or corresponding input signal emitted by the flow sensor;

-mode of the flow sensor installation: Enter or return.

8 normative documents requirements on construction and metrological characteristics of cold counters are deemed observed if the meter meets the requirements contained in the normative documents Swiss and European listed below:-SN in 1434 - 1:2002, thermal energy meters - part 1: General requirements; - SN in 1434 - 4:2002, counters of heat energy - part 4: examination for approval of model.

State on January 1, 2013

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