Principle, structure

The measurement principle of FE30H electromagnetic calorimeter is based on Faraday's law of electromagnetic induction: when a conductive liquid cuts magnetic field lines in a magnetic field, an induced potential is generated in the conductor, and the induced potential is E:

E=KBVD

In the formula: K - instrument constant

In the formula: B - Magnetic induction intensity

In the formula: V - the average flow velocity within the cross-section of the measuring tube

In the formula: D - measure the inner diameter of the pipeline cross-section

When measuring flow rate, a conductive liquid flows through a magnetic field perpendicular to the flow direction at a velocity of V. The flow of the conductive liquid induces a voltage proportional to the average flow velocity, and the induced voltage signal is detected by two or more induction electrodes in direct contact with the liquid and sent to a converter through a cable for intelligent processing, achieving the display of instantaneous fluid flow rate, accumulated flow rate, and communication between flow data and control system. There are no active or obstructed components inside the measuring tube, so there is almost no pressure loss and high reliability.

The electromagnetic heat meter combines an electromagnetic flowmeter and a paired temperature sensor organically. By using the electromagnetic flowmeter to measure flow and the paired temperature sensor (PT1000), it can calculate, accumulate, store, and display the heat absorbed or released in the heat exchange circuit. The flow and energy calculation unit CPU and sampling module of the FE30H electromagnetic heat meter are all equipped with ARM microcontrollers, which have large memory capacity and high reliability. The heat calculation can truly achieve enthalpy value calculation, achieving high accuracy.

Principles of Energy Measurement

The FE30H electromagnetic heat meter calculates and displays the heat released or absorbed by the system based on the flow signal from the flow sensor, the supply and return water temperature signal detected by the paired temperature sensor, and the time of water flow. The heat is displayed in the form of a meter, with a unit of KWh, a resolution of 1KWh, and a maximum display of 9 digits. The mathematical calculation model is as follows:

In the formula: Q - The heat released or absorbed by the system, measured in KWh; QM - the mass flow rate of water flowing through the heat meter, in kg/h; Qv - the volumetric flow rate of water flowing through the heat meter, in m3/h; ρ - the density of water flowing through the heat meter, in kg/m3; Δ h - The enthalpy difference of water at the inlet and outlet temperatures of the heat exchange system. The unit is kJ/kg; τ - time, in hours

Structural appearance

Flange connection type

Threaded connection type

FE30H Electromagnetic Thermometer Features... Advantages

Electromagnetic calorimeter is an instrument for measuring volumetric flow rate, and the measurement results are independent of physical parameters such as flow velocity distribution, flow pressure, temperature, density, viscosity, etc

There are no moving parts inside the measuring tube, making it easy to maintain and manage, so the sensor has a long service life; No obstruction components, no pressure loss

The minimum conductivity of the tested liquid can reach 5 μ S/cm, and with various lining materials, it can be used to measure the flow rate of various acid and alkali media with high accuracy, usually with a flow rate accuracy of ± 0.5%

High definition backlit LCD display, Chinese English menu operation, easy to use, simple to operate, easy to learn and understand

The converter has reliable performance, high accuracy, low power consumption, stable zero point, convenient parameter setting, LCD display, and can display parameters such as cumulative flow rate, flow rate, and flow percentage

The water inlet direction can be bidirectional, and installation is not restricted. Bidirectional measurement system, capable of measuring forward flow and reverse flow

● All digital processing, strong anti-interference ability, reliable measurement, high accuracy, flow measurement range can reach 150:1

Ultra low EMI switching power supply, with a wide range of voltage variations and good EMC resistance

● Equipped with RS485 digital communication signal output

Can be applied to air conditioning, heating and circulation systems with generally poor water quality

It can display parameters such as cumulative heat, cumulative flow rate, instantaneous flow rate, flow rate, supply water temperature, and return water temperature.

● Correct with changes in water temperature to ensure accurate measurement at different water temperatures

● Multi level password setting function to prevent malicious modification of data

Technical Parameter

Nominal diameter (mm):	Pipeline type PTFE lining: DN10～DN800	Flow rate range:	0.3－12m/s
	Pipeline type rubber lining: DN40~DN800 (special specifications can be customized)	Conductivity range:	The conductivity of the measured fluid is ≥ 5 μ s/cm
Temperature difference range:	2～75℃	Current output:	load resistance	4～20mA：0～750 KΩ
Temperature measurement range:	4～95℃	Power supply:	AC220V
Temperature resolution:	0.01℃	Total power consumption:	Less than 20W
accuracy:	0.1℃	Link method:	Flanges and threaded connections can be used between flow meters and piping
Temperature of the tested medium:	High temperature rubber lining: - 20～＋90℃	ambient humidity:	<90% r.h (non condensing)
	Polytetrafluoroethylene lining: - 30～＋100℃	Protection level:	IP65
	High temperature PTFE lining: - 20～＋180℃	Environmental temperature:	-25~+60 ℃ (please consult the engineer for special working conditions)
Rated working pressure: (High pressure can be customized)	DN15－DN80：≤2.5MPa	Required length of straight pipe section:	Upstream ≥ 5DN, downstream ≥ 2DN
	DN80－DN150：≤1.6MPa	Execution standards:	DIN EN 1092-1-2002
	DN200－DN800：≤1.0MPa		Sales Usage Standard (Order Remarks)
Display unit:	m³/H、m³/M、m³/S、L/H、L/M、L/S、G/H、G/M、G/S(H=Hour M=Minute S=Second）		LVD 2006/95/EC&EMC 2004/108/EC
			EN 61326-1：: 2006 Radiation Standard (BS EN50081-1)
			EN 61326-1：: 2006 anti-interference standard (BS EN50082-1)
			EN 61010-1: 2001 Equipment Safety Requirements: General Requirements

Applicable Medium

The lowest liquid conductivity can reach 5 μ S/cm

installation drawing

Note: For liquids or slurries containing solid particles, it is recommended to install them vertically with a flow direction from bottom to top. This is because impurities are prone to precipitate at the bottom of the measuring tube. Please refer to the installation instructions for straight pipe sections for specific installation

application

Used for cold/heat metering in central air conditioning systems and heating metering in the heating market

Selection of Electromagnetic Thermometers

1. The correct selection of electromagnetic calorimeter requires a detailed understanding of the following process parameters:

Fluid name, composition, conductivity	Determine if an electromagnetic calorimeter can be used for measurement
Fluid maximum temperature, minimum temperature, corrosiveness, wear resistance, and whether there is negative pressure	Determine whether an electromagnetic calorimeter can be used, what type of lining to choose, and electrode materials to use
Pipeline inner and outer diameters (mm), common flow rate, normal flow rate, minimum flow rate	Determine which caliber of electromagnetic calorimeter to choose
Maximum operating pressure and minimum operating pressure	Determine the pressure level of the calorimeter
INSTALLATION REQUIREMENTS	Determine whether to choose a one-piece or split type structure, and the length of the split cable
Installation environment	Determine the protection level of the calorimeter

The actual maximum working pressure must be less than the rated working pressure of the electromagnetic calorimeter;

The minimum and maximum operating temperatures must comply with the temperature requirements specified in the flow measurement regulations (see the lining material table for details);

From an economic perspective, an electromagnetic thermal energy meter with a diameter corresponding to an appropriate flow rate can be selected to relatively reduce investment (see flow range table);

Reasonably select the corresponding accuracy level based on the measurement purpose and function;

Select electrode materials for electromagnetic thermometers based on the corrosiveness of the medium;

Select the lining material for the flow rate based on the corrosiveness, wear resistance, and temperature of the medium;

According to the requirements and environment of the installation site, choose whether to use an integrated electromagnetic thermal energy meter or a split type electromagnetic thermal energy meter reasonably.

2. Selection of Electromagnetic Thermometer Caliber:

Nominal diameter (mm)	Measurable flow range (m ³/h)			Nominal diameter (mm)	Measurable flow range (m ³/h)
	minimum	maximum	in common use		minimum	maximum	in common use
15	0.06	6.4	1.5	200	11.3	1130	250
20	0.11	11	2.5	250	17.66	1766	400
25	0.18	18	3.5	300	25.43	2543	600
32	0.29	29	6	350	34.62	3460	750
40	0.45	45	10	400	45.22	4522	900
50	0.71	71	15	450	57.23	5723	1200
65	1.19	119	25	500	70.65	7065	1500
80	1.81	181	40	600	101.74	10174	2500
100	2.83	283	60	700	138.47	13847	4000
125	4.42	442	100	800	180.86	18086	5000
150	6.36	636	150

3. Selection of lining:

Material type	Performance	scope of application
neoprene	Good wear resistance, excellent elasticity, high tensile strength, and resistance to corrosion from low concentration acid-base salt media, but not resistant to corrosion from oxidizing media.	<90 ° C, general water, sewage, mud, slurry
Polytetrafluoroethylene (PTFE)	The most stable material in terms of chemical properties, capable of withstanding boiling hydrochloric acid, sulfuric acid, nitric acid, aqua regia, concentrated alkali, and various organic solvents, but not resistant to chlorine trifluoride and high-temperature oxygen difluoride.	Strong corrosive media such as concentrated acid and alkali, sanitary media (PTFE lining: -30~+100 ℃; high-temperature PTFE lining: - 20～＋180℃）

4. Selection of electrode materials:

material	Corrosion Resistance
316l stainless steel	Applicable: industrial water, domestic water, sewage, with a wide range of applications.
Hastelloy HB	Resistant to all concentrations of non oxidizing acids, bases, and non chlorinated hydrochloric acids such as hydrochloric acid, sulfuric acid, hydrofluoric acid, and organic acids at boiling point. Not applicable: nitric acid
Hastelloy HC	Resistant to oxidizing acids such as nitric acid, mixed acids, or mixtures of chromic acid and sulfuric acid, as well as oxidizing salts and seawater. Not applicable: Hydrochloric acid

5. Selection of Thermal Energy Meter Types:

Split type

Split type is a common application form of electromagnetic thermal energy calculation. The sensor is separately connected to the process pipeline, and the converter is installed in other places several meters or more apart, connected by cables in between. A split type calorimeter can keep the converter away from harsh environments and facilitate observation and adjustment of set parameters.

All-In-One

One in one type refers to the assembly of a converter and a sensor into a whole, with the connecting wires inside the instrument. It is relatively easy to use, and due to the infrequent use of cables, external interference is also relatively small. Integrated flow meters are generally used for small caliber instruments. If the sensor is installed at a high place or in difficult to observe environments, such as high temperatures or large vibrations, and the electronic components of the converter are difficult to withstand, integrated electromagnetic thermometers should not be used.

6. Selection of grounding ring:

(1) The forms of grounding rings are divided into universal and protective types. Generally, universal type is used. If the tested medium is abrasive, a protective grounding ring with a neck should be used to protect the lining at the inlet and outlet ends and extend the service life. If the diameter of the electromagnetic flowmeter is below 200, when using a polytetrafluoroethylene lining, a grounding ring should be selected to ensure that the lining is not damaged during installation and connection with the pipeline.

(2) The material of the grounding ring should be compatible with the corrosiveness of the tested medium, but with lower requirements than the electrode material, as it can be replaced after corrosion. The grounding ring is usually made of stainless steel or Hc alloy.

7. Selection of Protection Level for Electromagnetic Thermometers:

IP65： Dustproof and water-resistant type	Allow the faucet to spray water onto the sensor from any direction, with a spray pressure of 30KPa and a water output of 12.5L/min. Distance is 3m
IP67： Dustproof and waterproof type	Prevent short-term water intrusion. After about 30 minutes of immersion in 1 meter of water, the amount of water intrusion into the shell should not reach a harmful level
IP68： Dustproof and anti diving type	Sensors work in water for a long time

8. Selection of Special Voltage Resistance for Electromagnetic Thermometers:

The pressure resistance of sensors is related to their inner diameter. According to the relevant national standards and regulations for product application, the maximum pressure resistance of standard steel pipes and flanges is as follows:

caliber	pressure resistance
DN-10～80	4.0MPa
DN-100～150	1.6MPa
DN-200～800	1.0MPa

Note: If the pressure of the fluid inside the sensor exceeds the maximum pressure resistance mentioned above, it belongs to the pressurized type and requires special customization

2. Except for sensors lined with polytetrafluoroethylene, sensors lined with other materials can operate under negative pressure in pipelines

Dimensional drawing (flange type)

Flange type dimension diagram

Integrated split type

FE30H external dimensions (flange type: DN15 to DN50:PN40 ; DN65 to DN200; PN16 ; DN250 to DN800 :PN10 , Other PN6)

Size (mm)			Dimensions between flange sections L (mm)				Outer diameter of flange D (mm)					Height H1 (mm)			Height H2 (mm)
			PTFE lining		rubber lining
15			–		–		95					277			214
20			–		–		105					284			221
25			156		–		115					293			230
32			156		–		140					304			241
40			196		–		150					317			254
50			196		–		165					331			268
65			200		200		185					348			285
80			200		200		200					363			300
100			250		250		220					382			319
125			250		250		250					414			351
150			300		300		285					445			382
200			350		350		340					506			443
250			400		400		395					559			496
300			500		500		445					609			546
350			500		500		505					645			582
400			600		600		565					698			635
450			600		600		615					748			685
500			600		600		670					803			740
600			600		600		780					910			847
700			700		700		895					1046			983
800			800		800		1010					1154			1091

Dimensional drawing of threaded connection type

Size (mm)	Body face size	Outer diameter D		H1(mm)		thread specification
	L(mm)
15	160	89		272		G1
20	160	89		272		G1
25	160	89		272		G1-1/4
32	160	89		272		G1-1/2
40	160	102		285		G2
50	160	108		291		G2-1/2

FE30H Installation Requirements

Requirements for upstream and downstream straight pipe sections of sensors:

In order to ensure the accuracy stated in the manual under different application conditions, a straight pipe section with a diameter five times the diameter should be installed upstream of the electrode surface and a straight pipe section with a diameter three times the diameter should be installed downstream when installing the sensor, as shown in the following figure. This installation can fully eliminate interference caused by bends, valves, or necking. When the straight pipe sections before and after the flowmeter cannot meet the requirements, there will be a certain deviation in performance indicators.

Grounding requirements for sensors:

There must be a reliable grounding path between the electromagnetic calorimeter sensor and the measured medium. There are three grounding methods to choose from: grounding electrode, grounding ring, and pipeline grounding. Please refer to the selection table for details.

Model Selection Table

FE30H-	Electromagnetic thermal energy meter (cold energy meter)
	Installation type of transmitter
		Integrated on-site display setting type
		Split remote transmission display setting type (square)
		orifice
			15 to 800mm (such as pipe diameter DN15 and expressed as 15)
			Installation method
				Threaded type (DN15 to DN50)
				Flange type (DN15 to DN800)
				Electrode material
					Electrode Material Stainless Steel 1.4435 (316L)
					Electrode material Hastelloy HC
					Electrode material Hastelloy HB
					Shell and flange material
						Main material: Carbon steel
						Main material: Stainless steel 1.4301 (304)
						Main material: Stainless steel 1.4435 (316L)
						Output
							no-output
							4 to 20mA+pulse
							Lining material
								Inner lining material PTFE (polytetrafluoroethylene)
								Lining Material PUR (Polychloroprene Rubber)
								Power supply mode
									AC 85V to 265V
									DC 24V
									accuracy class
										1%
										2%
										(Optional accessory) Grounding method
											No grounding ring
											Stainless steel 1.4435 (316L) grounding ring
											Titanium alloy grounding ring
The above selection table does not include selection codes. If you need selection codes, please contact us or fill in your information

Process connection withstand voltage level		/D6		EN 1092-1(DIN) PN6
		/D10		EN 1092-1(DIN) PN10
		/D16		EN 1092-1(DIN) PN16
		/D25		EN 1092-1(DIN) PN25
		/D40		EN 1092-1(DIN) PN40
		/D63		EN 1092-1(DIN) PN63
		/D100		EN 1092-1(DIN) PN100
		/D250		EN 1092-1(DIN) PN250
		/P		Special standards for product application areas

Alternative options: Interface standards&communication methods

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Communication: RS485