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User Guide

2. Determination of

measurement errors of

the meter

2.1. Volume measuring

errors determination test

2.2. Energy measurement

errors determination test

6 | BC389148615526en-010101

SonoMeter 40

The determination of volume measurement errors shall be carried out in the hydrodynamic test

bench in the following order:

1) The test mode is activated in accordance with section 1.1, 1.2, or 1.3 of this instruction.

2) The volume measuring errors should be evaluated at control flow rates specified in EN1434-5.

3) The volume of water, passing through the meter can be read directly from the indicating device

(with resolution 1 ml);

- Via meter optical output, using the optical reading head according to 62056-21;

- Or trough wired volume pulse 2nd output (for a complete meter with a connected pulse input /

output cable and for a meter activated in test mode according to p.1.2 of this instruction);

4) Volume pulse values in test mode are presented in table 1p:

Table 1p

Permanent flow-rate qp of the heat meter, m³/h

0,6 and 1,0

1,5

2,5

3,5 and 6

10; 15 and 25

40 and 60

The energy measurement error of a calculator with temperature sensors pair shall be evaluated by

immersing the temperature sensors in a temperature regulated baths. The test shall be performed in

the following order:

1) The test mode is activated in accordance with section 1.2 of this instruction;

2) The meter temperature sensors are immersed in thermostatic baths, which form the supply and

return line temperature and temperature difference values specified in EN 1434-5.

NOTE: energy measurement error determination may be performed separately for a calculator with

a flow sensor. In this case, the temperature and temperature differences of the supply and return line

specified in EN 1434-5 are simulated by connecting the reference resistors to the calculator terminals

No.5;6;7;8.

3) Long press the button (for more than 5 seconds) activates the simulation of the volume pulses (the

meter display periodically shows "SF" with the nominal flow rate of the meter, m³/h):

4) After 2,5 min. the volume simulation is completed, the sign „SF" turns off. To calculate the energy

measurement error, the simulated volume and energy readings shall be visually read from the

meter display;

5) The amount of volume or energy can be read through the wired pulse output (if it is equipped in

the meter);

6) The amount of volume or energy can be read through the meter's optical interface output using an

optical scan head that complies with EN 62056-21;

7) Energy pulse values in test mode are presented in table 2p:

Table 2p

Permanent flow-rate qp

of the heat meter, m³/h

0,6 and 1,0

1,5

2,5

3,5 and 6

10; 15 and 25

40 and 60

0,6 and 1,0

Volume pulse value in test mode, litre/pulse

Energy pulse value based on displayed energy units:

„kWh", „MWh"

0,1 Wh/pulse

0,5 kJ/ pulse

0,2 Wh/ pulse

1 kJ/ pulse

0,5 Wh/ pulse

2 kJ/ pulse

1 Wh/ pulse

5 kJ/ pulse

2 Wh/ pulse

10 kJ/ pulse

5 Wh/ pulse

20 kJ/ pulse

10 Wh/ pulse

50 kJ/ pulse

0,002

0,004

0,005

0,02

0,05

0,2

„GJ"

„Gcal"

0,1 kcal/ pulse

0,2 kcal/ pulse

0,5 kcal/ pulse

1 kcal/ pulse

2 kcal/ pulse

5 kcal/ pulse

10 kcal/ pulse