Characteristics

Value

1

2

Heat-transfer medium

water

Working pressure, MPa, not more than

1.6 or 2.5

Heat-transfer medium flow measurement range, m³/h

0.015 - 200.0

Heat-transfer medium temperature measurement range, °C

from 0 to 150

Heat-transfer medium temperature difference measurement range, °C

from 2 to 150

Measurement range of input analog signals proportional to excess pressure, mA

from 4 to 20

Accuracy class according to ST RK 2.105 (ST RK GOST R EN 1434-1)

B (2) C(1)

Limits of permissible relative error of the heat quantity measuring channel according to ST RK 2.105, %

- class B

- class C

±(3 + 4Δtₕ/Δt + 0.02Gᵦ/G)
±(2 + 4Δtₕ/Δt + 0.01Gᵦ/G)

where G and Gₑ are the flow rate values of the heat-transfer medium and its maximum value in the supply pipeline, m³/h;

Δtₕ/Δt is the temperature difference in the supply and return pipelines of the heat-exchange circuit, °C.

Limits of permissible relative error when measuring mass and volume flow rate, mass, and volume of the heat-transfer medium according to ST RK GOST R EN 1434-1-2010, %

- for class (2)

- for class (1)¹⁾

±(2.0 + 0.02qₚ/q), but not more than ±5.0;
±(1.0 + 0.01qₚ/q), but not more than ±5.0

qₚ – constant flow rate (maximum flow rate at which the heat meter operates continuously without exceeding the maximum permissible error), m³/h;
q – flow rate value, m³/h.

Limits of permissible absolute error of the calculator when converting signals from resistance temperature detectors, °C

±(0.1 + 0.00014)

Limits of permissible absolute error in temperature measurement, °C: – with Class A resistance temperature detectors according to GOST 6651-2009 – with Class B resistance temperature detectors according to GOST 6651-2009

±(0.25+0.00214) ±(0.4 + 0.00514)

Maximum permissible temperature sensor error (ST RK GOST R EN 1434-1-2010), %

± (0.5 + Δtₘᵢₙ/Δt)

Δtₘᵢₙ – minimum temperature difference, °C;
Δt – temperature difference, °C.

Maximum permissible calculator error (ST RK GOST R EN 1434-1-2010), %

± (0.5 + Δtₘᵢₙ/Δt)

Δtₘᵢₙ – minimum temperature difference, °C;
Δt – temperature difference, °C.

Limits of permissible reduced error of the calculator when converting excess pressure sensor signals, %

±0.15

Limits of permissible reduced error of excess pressure sensors, %

±1.85

Limits of permissible relative error of the heat meter when measuring excess pressure, %

±2.0

Limits of permissible relative error when measuring time intervals, %

±0.01

Power supply from AC mains: - voltage, V - frequency, Hz

from 187 to 253; from 49 to 51

Operating conditions:

- ambient temperature, °C

- relative air humidity at temperatures up to 30 °C, %

- atmospheric pressure, kPa

from +5 to +55; up to 95; from 84 to 106.7

Power consumption, VA, not more than

30

Dimensions of the measuring and calculating unit, mm, not more than  

205x182x95

Weight of the measuring and calculating unit, kg, not more than

2.0

Degree of protection provided by the enclosure, according to GOST 14254-2015

IP54

Mean time between failures, hours, not less than

80,000

Average service life, years, not less than

15