Operating principle:

With a developed turbulent flow in pipes, the local flow velocity measured at a distance of 0.242 R from the inner surface of the pipeline wall (R is the inner radius of the pipeline) is average speed cross-section and, therefore, proportional to the volumetric flow.

The local flow rate is measured by primary velocity converters (PS), the principle of which is based on the phenomenon of electromagnetic induction. When the magnetic field created by the excitation coil interacts with a moving electrically conductive liquid, an EMF of electromagnetic induction is induced, which is proportional to the local flow velocity. EMF is removed by electrodes located at the end of the flow transducer. The signal is fed to the electronic unit (EB), where the flow rate and volume of the liquid passed through the cross-section of the pipeline are calculated. The electronic unit archives the measuring information and performs diagnostics of the device state.

Heat meter modifications:

• KM-5-B1, RM-5-B1- with one primary speed converter.
• KM-5-B3, RM-5-B3- with three primary speed converters installed in one plane of the pipe cross-section along the perimeter every 120 °.

Thermal converters and pressure transducers are connected to the electronic unit of the speed converter to determine the amount of heat, mass flow rate and mass of the measured medium.

The main specifications

• Diameters of pipelines DN, mm: from 300 to 5000.
• Dynamic Range (G max / G min): 50.
• Relative error in measuring flow, volume and mass:
  for KM-5-B1, RM-5-B1:
  • in the range 1 ≤ G max / G ≤ 25: 2.0%;
  • in the range of 25< G max /G ≤ 50: 3,0%;
  for KM-5-B3, RM-5-B3:
  • in the range 1 ≤ G max / G ≤ 25: 1.5%;
  • in the range of 25< G max /G ≤ 50: 2,5%.
• Measured liquid parameters:
  • temperature, ° C: up to 150;
  • pressure, MPa: up to 1.6 (2.5 *).
• Lengths of straight pipeline sections before / after the measuring section, DN:
  • for KM-5-B1, RM-5-B1: according to GOST 836175;
  • for KM-5-B3, RM-5-B3: 10 / 5.
• Power consumption: 10 W, 30 W.
• Calibration interval: 4 years.
• Service life: 12 years.

* With special execution to order.

Distinctive features:

• high measurement accuracy;
• wide dynamic range;
• automatic recognition of the absence of liquid in the pipe;
• short lengths of straight pipe sections (when installing 3 primary converters);
• the ability to transfer data to a computer via the RS-485 interface at a distance of up to 1 km;
• possibility of assembly / disassembly without stopping the flow in the pipeline;
• simplicity and ease of installation and operation;
• low power consumption.

Heat meters and flow meters are equipped with an RS-485 interface for outputting information to a printer, modem, personal computer.

Devices can be equipped additionally or instead of another type of RS-485 interface.

Heat meters and flow meters, if necessary, are combined into information networks via the RS-485 interface.

On request, they are completed with converters providing an output electrical signal: direct current, frequency.

• Wide dynamic range of measurement G max / G min = 1000;
• Small length of straight sections of pipelines (3Du-1Du);
• Standard sizes of primary flow converters from DN = 15 mm to DN = 300 mm;
• The KM-5 heat meter has an empty pipe sensor, due to which, in the absence of a coolant in the pipeline, the current flow measurement result is reset to zero;
• Measurement of reverse flows in automatic mode;
• Outside air temperature control;
• In the software of heat meters and flow meters, an auto-calibration procedure is established, which allows maintaining metrological characteristics during an intertesting interval equal to 4 years;
• The devices, regardless of the accuracy class, meet the requirements of the best classes: 1st according to the recommendation of the International Organization of Legal Metrology (MP75) and class C according to GOST 51649-2000. Heat meters KM-5 meet the requirements of Russian and international standards in terms of flow measurement error.
• Heat meters and flow meters are equipped with RS-232, RS-485 interfaces for outputting information to a printer, modem, personal computer or other devices;
• The depth of archiving of average hourly parameters is 42 days, and average daily parameters - 12 months, which allows in case of disputes between a supplier and a consumer of energy resources to have objective information about the characteristics of the heat and water supply system.

The electronic unit (heat calculator) of the KM-5 heat meter is an industrial controller with resident software. ЭБ КМ-5 is structurally made in a dust-and-moisture-proof case, placed directly on the primary flow transducer. 1 PRE, 2 thermal converters, 1 thermal converter for measuring the ambient temperature and up to 2 pressure sensors are connected to the ЭБ КМ. The electronic unit measures, digitizes and further processes the output signals of the flow sensors, temperature and pressure of the coolant.
The calculated parameters of the coolant can be transferred in units of measurement (t / h, kPa, ° С ...) to a PC, or to an information network via the RS-485 interface. ЭБ КМ-5 is also designed to form the supply voltage of the excitation coils of the electromagnetic flow transducer, the stabilized current for the DC and the supply voltage of the pressure sensors.
An indicator and four control buttons are located on the front panel of the electronic unit (see photo above).
To organize the flow metering for the second pipeline and heat metering in open heat supply systems at the consumer and at the heat source, a modification of the electronic unit is provided that works in conjunction with the EC KM in the mode of the primary signal converter (PPS). PPS performs measurement, digitization and preprocessing of flow sensor signals, up to 2 pressure sensors and 2 coolant temperature sensors. Calculated values ​​and service messages (information about errors, failures, emergency situations etc.) are transferred to the EC KM via the RS-485 interface.
In heat meters KM-5-2, KM-5-3, KM-5-4, KM-5-5 and KM-5-6, one of the electronic units is made in the PPS modification.

The heat meter does not require any special maintenance.
The heat meter (TC) put into operation requires periodic inspection in order to:

• compliance with the vehicle operating conditions;
• absence of external damage to the vehicle components;
• checking the reliability of electrical and mechanical connections;
• checking the presence of seals on the components of the vehicle;
• checking the presence of supply voltage;
• checking the vehicle's performance.

Periodically (the period depends on the temperature in the pipeline and is determined experimentally) it is necessary to check the presence of oil in the thermowells of the thermal converters and to compensate for its losses from drying out.

If the vehicle is used in the conditions of heat transfer fluids that have a physicochemical composition that differs from the requirements of regulatory documents, it is necessary to periodically flush the flow path of the PRE without the use of abrasive materials.
Perform flushing regularly in the service mode, avoiding metrological failure. The frequency of flushing the flow path of the PRE depends on the specific operating conditions.

To reduce the influence of ferromagnetic inclusions contained in the coolant, it is recommended to use magnetic-mechanical filters.

During the operation and maintenance of the heat meter, it is necessary to observe the "Rules for the operation of electrical installations by the consumer" and "Interindustry rules for labor protection (safety rules) during the operation of electrical installations".

IT IS FORBIDDEN to eliminate defects of the primary converter without making sure that there is no pressure in the line.

The heat meter is subject to mandatory primary verification, as well as periodic verification at least once every three years or in the case when its readings raise doubts about the proper operation of the heat meter itself.

Calibration of heat meters is carried out according to the method of MP 42968951-2001.

Downloads

Features of the KM-5 heat meter:

• Wide dynamic range of measurement G max / G min = 1000;
• Small length of straight sections of pipelines (3Du-1Du);
• Standard sizes of primary flow converters from DN = 15 mm to DN = 300 mm;
• The KM-5 heat meter has an empty pipe sensor, due to which, in the absence of a coolant in the pipeline, the current flow measurement result is reset to zero;
• Measurement of reverse flows in automatic mode;
• Outside air temperature control;
• In the software of heat meters and flow meters installed auto-calibration procedure, which allows you to maintain metrological characteristics throughout the calibration interval equal to 4 years;
• The devices, regardless of the accuracy class, meet the requirements of the best classes: 1st according to the recommendation of the International Organization of Legal Metrology (MP75) and class C according to GOST 51649-2000. Heat meters KM-5 meet the requirements of Russian and international standards in terms of flow measurement error.
• Heat meters and flow meters are equipped with RS-232, RS-485 interfaces for outputting information to a printer, modem, personal computer or other devices;
• The depth of archiving of average hourly parameters is 42 days, and average daily parameters - 12 months, which allows in case of disputes between a supplier and a consumer of energy resources to have objective information about the characteristics of the heat and water supply system.

Limits of measurement of flow transducers of the heat meter KM-5:

Description of the electronic computing unit of the KM-5 heat meter:

The electronic unit (heat calculator) of the KM-5 heat meter is an industrial controller with resident software. ЭБ КМ-5 is structurally made in a dust-and-moisture-proof case, placed directly on the primary flow transducer. 1 PRE, 2 thermal converters, 1 thermal converter for measuring the ambient temperature and up to 2 pressure sensors are connected to the ЭБ КМ. The electronic unit measures, digitizes and further processes the output signals of the flow sensors, temperature and pressure of the coolant.
The calculated parameters of the coolant can be transferred in units of measurement (t / h, kPa, ° С ...) to a PC, or to an information network via the RS-485 interface. ЭБ КМ-5 is also designed to form the supply voltage of the excitation coils of the electromagnetic flow transducer, the stabilized current for the DC and the supply voltage of the pressure sensors.
An indicator and four control buttons are located on the front panel of the electronic unit (see photo above).
To organize the flow metering for the second pipeline and heat metering in open heat supply systems at the consumer and at the heat source, a modification of the electronic unit is provided that works in conjunction with the EC KM in the mode of the primary signal converter (PPS). PPS performs measurement, digitization and preprocessing of flow sensor signals, up to 2 pressure sensors and 2 coolant temperature sensors. The calculated values ​​and service messages (information about errors, failures, abnormal situations, etc.) are transmitted to the EC KM via the RS-485 interface.
In heat meters KM-5-2, KM-5-3, KM-5-4, KM-5-5 and KM-5-6, one of the electronic units is made in the PPS modification.

Maintenance of the KM-5 heat meter.

Periodically (the period depends on the temperature in the pipeline and is determined experimentally) it is necessary to check the presence of oil in the thermowells of the thermal converters and to compensate for its losses from drying out.

If the vehicle is used in the conditions of heat transfer fluids that have a physicochemical composition that differs from the requirements of regulatory documents, it is necessary to periodically flush the flow path of the PRE without the use of abrasive materials.
Perform flushing regularly in the service mode, avoiding metrological failure. The frequency of flushing the flow path of the PRE depends on the specific operating conditions.

To reduce the influence of ferromagnetic inclusions contained in the coolant, it is recommended to use magnetic-mechanical filters.

During the operation and maintenance of the heat meter, it is necessary to observe the "Rules for the operation of electrical installations by the consumer" and "Interindustry rules for labor protection (safety rules) during the operation of electrical installations".

IT IS FORBIDDEN to eliminate defects of the primary converter without making sure that there is no pressure in the line.

The heat meter is subject to mandatory primary verification, as well as periodic verification at least once every three years or in the case when its readings raise doubts about the proper operation of the heat meter itself.

Calibration of heat meters is carried out according to the method of MP 42968951-2001.

Teplopribor Group of Companies (GC) (Teplopribor, Prompribor, Teplokontrol, etc.)- these are devices and automation for measuring, monitoring and regulating the parameters of technological processes (flow metering, heat control, heat metering, control of pressure, level, properties and concentration, etc.).

At the manufacturer's price, products are shipped from both our own production and our partners - leading factories - manufacturers of instrumentation and automation, control equipment, systems and equipment for controlling technological processes - APCS (much is available in the warehouse or can be manufactured and shipped as soon as possible) ...

KM-5 electromagnetic heat meters and flow meters

Price: from 27 380 rubles.

Availability in stock: On order *

* In a warehouse in Moscow, there are electromagnetic heat meters in the standard (basic) design and configuration; in the absence of any special versions, the planned production period will be 15-20 working days or inexpensive analogs that are available may be offered.

Delivery time: 10-15 working days. days

All prices for electromagnetic heat meters are indicated in rubles (see the general price list) excluding VAT, additional cost. options and equipment, KMCH, packaging, shipping and / or delivery costs, based on a small wholesale order (for large wholesale lots and for project orders, the price is formed individually, based on the volume of the batch, the agreements reached and the address of the object).

ATTENTION! Be careful when choosing a supplier - on the Russian heat metering market there are cheap low-quality copies of electromagnetic heat meters: analogues, fakes and illiquid assets, deprived of proper service, guarantees, with shorter or expiring verification times, not included in the base, without additional options, mounting and connecting parts ; therefore, perhaps even having a lower price.

To carry out measurements in OVST, ZVST, TVST, with pipelines with a nominal bore of not more than DN 300, seven full-bore modifications are used: KM-5-1 ... KM-5-7, made on the basis of PRE. Modification KM-5-1 is intended for measurements in closed and dead-end VST at sources and at consumers of thermal energy. Modification KM-5-2 is intended for closed VST at consumers.

Modifications KM-5-3 and KM-5-7 are intended for open VST at thermal energy sources. Modifications KM-5-4 and KM-5-5 are intended for open VST at consumers. Modification KM-5-6 is a universal (configurable) modification designed for measuring thermal energy both in closed and open VST, or in two independent VST of various kinds(i.e. one TSA can be open and the other closed).

KM-5 provide display of measuring information and parameters of its state on the display of a computing device or on the display of an auxiliary component of a peripheral device - an AP-5 peripheral adapter.

The alphanumeric display of the VU shows the following data:

• thermal energy Q, Gcal and MWh for one or two (Q, Q2) heating systems;
• volume V, m 3 and mass M, t of the coolant in the supply and / or return (make-up) pipeline;
• volume V, m 3, the current value of the volumetric flow rate Gv, m 3 / h in the hot water (cold water) pipeline, on which the software is installed.

PECULIARITIES

The above information can be transmitted via the RS-485 interface. KM-5 provide, on request, the conversion of volumetric flow (volume) values ​​into standard output signals: current (from 4 to 20 mA) and / or frequency (from 10 to 5000 Hz) using autonomous ATCHV units connected to a computing device.

KM-5 provide archiving in non-volatile memory (EEPROM) for each pipeline being serviced and in total for all pipelines of the following information:

• hourly, daily and monthly values ​​of heat energy and operating time (cumulative total), annual values ​​of thermal energy (for each year) for one or two (Q, Q2) heat supply systems and operating time (for each year);
• average hourly, daily average, monthly average and average annual values ​​of the temperature of the network water (hot or cold) in the supply and return (make-up) pipelines, temperatures in the pipelines on which an additional TP or KTP is installed (the weighted average temperature values ​​for the corresponding period are archived), and temperatures outside air;
• hourly average, daily average, monthly average and annual average pressure values ​​of the measured medium in pipelines where pressure transducers (sensors) are installed.
• hourly, daily, monthly and yearly volume values ​​(cumulative total);
• hourly, daily and monthly volume and weight (cumulative total), annual volume and weight (for each year) of the coolant that has passed through the supply and / or return (make-up) pipeline and through pipelines on which additional PRE and / or software are installed;
• hourly average, daily average, monthly average and average annual values ​​of the outside air temperature;
• information about erroneous situations during measurements and various abnormal events arising during the operation of the KM-5.

The depth of archives in KM-5 is, not less than:

• 42 days - for hourly archive;
• 12 months - for daily archive;
• 5 years - for a monthly archive;
• 32 years old - for the weather archive;
• 4096 records with information - for the archive of errors and events.

Recording to all archives is organized in a closed loop - after filling the entire depth of the archive, a new recording will be made to the place of the very first record in the archive, the next new record will be made to the place of the second record, and so on.

When the mains supply is disconnected, all KM-5 data archives are stored in non-volatile memory for at least 10 years. In the case of completing KM-5 with uninterruptible power supply units during a one-time power outage, the KM-5-1 modifications continue to work for 24 hours, and the KM-5-2, KM-5-3, KM-5-4, KM-5 modifications -5 and KM-5-6 - within 14 hours. Full charge recovery time battery- 12 hours.

Note:

1 When using BPi3V or similar.

2 Modification KM-5-1 can also be used to measure thermal energy and / or the amount of hot water in TVST or dead-end hot water supply at the source and at consumers of thermal energy, in which the set of thermal converters is replaced by a single thermal converter.

Designation when ordering

Positions 1–12 must indicate the characteristics of KM-5 and the components that make up it.

1 - modification number KM-5-1, KM-5-2 ... KM-5-7;

2 - class КМ-5, for ZVST: С, В, А according to GOST R61549; or classes 1, 2, 3 according to EN 1434-1; for modifications KM-5-1 and KM-5-2; for OVST, i.e. modifications KM-5-3 ... .KM-5-7 class KM-5 is not indicated, a dash is put;

3 - an abbreviated notation of the nominal size (without DN designation) of the primary flow transducers on the supply pipeline;

4 - nominal bore (without DN designation) of primary flow transducers for the return pipeline (or make-up for KM-5-3). For TVST, 0 is put in the middle;

5 - accuracy class of flow transducers A1, B1, etc. according to the manufacturer's classification;

6 - design number: 1 or 3 (versions 2 and 4 KM-5 for modifications KM-5-1 ... KM-5-7 are not used);

7 - connection of flow sensors to pipelines: Fl - flanged or Rz - threaded;

8 - the number of sets of thermal converters included in the KM-5 (if they are not there, set to 0);

9 - the number of single thermal converters included in the KM-5 (excluding those included in the sets), if they are not present, set to 0;

10 - number of pressure sensors; if they are absent, 0 is set;

11 - the ability to measure the flow rate and quantity in flows flowing in the opposite (reverse) direction: yes - 1, no - 0;

12 - the presence of a front panel with a display and a keyboard on the KM electronic unit: 1 - yes; 0 - no.

An example of an entry when ordering

The consumer of thermal energy must have a modification KM-5-2, which has class C according to GOST R 51649, standard flow transducers PRE must have a nominal diameter of DN 100 on the supply pipeline and DN 80 on the return pipeline, the accuracy class of the PRE must be B1 (according to manufacturer's classification), the PRE must have design 1, the connection of the PRE flow sensors to the pipeline must be flanged.

The KM-5-2 should include one set of thermal converters, one single thermal converter and three pressure transducers (sensors), measurements during the return (reverse) flow should not be carried out, there should be a front panel with a display and a keyboard on the KB KM.

The record of such an order should be as follows:

KM-5 - 2 - S - PRE * 100/80 - B1 - ISP 1 - Fl - 1 * Kt - 1 * t - 3 * R - 0 - 1