Potassium nitrate flowmeterMain features:
1. The measurement of flow rate is not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. The sensor induced voltage signal is linearly related to the average flow rate, resulting in high measurement accuracy.
2. There is no obstruction in the measuring pipeline, so there is no additional pressure loss; There are no movable parts inside the measuring pipeline, so the sensor has an extremely long lifespan.
3. Due to the fact that the induced voltage signal is formed in the entire space filled with a magnetic field and is the average value on the surface of the pipeline, the sensor requires a shorter straight pipe section, with a length of 5 times the diameter of the pipeline.
4. The sensor part only has the inner lining and electrodes in contact with the measured liquid. As long as the electrode and inner lining materials are selected reasonably, they can be corrosion-resistant and wear-resistant.
5. The LD converter adopts internationally advanced microcontroller (MCU) and surface mount technology (SMT), with reliable performance, high accuracy, low power consumption, stable zero point, and convenient parameter setting. Click on the Chinese display LCD to show accumulated flow, instantaneous flow, flow rate, flow percentage, etc.
6. Measurement system, capable of measuring forward flow and reverse flow. Using special production processes and high-quality materials to ensure stable product performance over a long period of time.
7. Suitable for measuring the volumetric flow rate of conductive liquids and slurries in closed pipelines, such as clean water, sewage, various acid-base salt solutions, mud, slurry, pulp, and liquids related to food.

Potassium nitrate flowmeterFlow meter structure form:
1. Sensor:
The sensor mainly consists of a measuring conduit, measuring electrodes, excitation coils, iron cores, magnetic yokes, and a housing.
a、 Measurement catheter: composed of stainless steel catheter, lining, and connecting flange, it is a carrier for measuring the on-site working conditions of the measured liquid.
b、 Measurement electrode: a pair of electrodes installed on the inner wall of the measurement catheter, perpendicular to the axial flow direction, to generate signals for the measured liquid.
c、 Excitation coil: The upper and lower excitation coils that generate a magnetic field inside the measuring conduit.
d、 Iron core and magnetic yoke: Introduce the magnetic field generated by the excitation coil into the liquid and form a magnetic circuit.
e、 Shell: Instrument outer packaging.
2. Converter: It is an intelligent secondary meter that amplifies and processes flow signals. After being operated by a microcontroller, it can display flow and cumulative measurement, and output signals such as pulses and analog currents for measuring or controlling fluid flow.
3. Product assembly form: It is divided into two forms: integrated and split.
a、 Integrated: The sensor and converter are installed together.
b、 Split type: Sensors and converters are installed separately, forming a flow metering system through connecting cables.
c、 To meet the requirements of measuring different media, there are multiple choices for the lining and electrode materials of sensors.

Potassium nitrate flowmeterMain features:
1Potassium nitrate flowmeterThe transmitter has a simple structure, no movable parts, and no throttling components that hinder fluid flow, so it will not cause any additional pressure loss when the fluid passes through. At the same time, it will not cause problems such as wear and blockage, and is particularly suitable for measuring liquid-solid two-phase fluids such as slurry with solid particles, sewage, and various viscous slurries. If corrosion-resistant insulation lining is used and corrosion-resistant materials are selected to make the click, it can be used for measuring various corrosive media.
2. The sewage treatment flowmeter is a volumetric flow measurement instrument that is not affected by the temperature, viscosity, density, and conductivity (within a certain range) of the measured medium during the measurement process. Therefore, after water calibration, sewage treatment flow meters can be used to measure the flow rate of other conductive liquids without the need for additional corrections.
3. The range of the sewage treatment flowmeter is extremely wide, with a range of 100:1 for the same sewage treatment flowmeter. In addition, the sewage treatment flowmeter is only proportional to the average flow velocity of the measured medium, and is independent of the flow state under axisymmetric distribution.
4. The sewage treatment flowmeter has no mechanical inertia, sensitive response, can measure instantaneous pulsating flow rate, and has good linearity. Therefore, the measurement signal can be directly converted into a standardized signal output by a converter, which can be used for on-site indication or long-distance transmission.

Potassium nitrate flowmeterMain technical parameters
Nominal diameter series DN (mm)
Pipeline PTFE lining: 10, 15, 20, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600
Pipeline rubber lining: 40, 50, 65, 80, 100, 125, 150, 200, 300, 350, 400, 500, 600, 800, 1000, 1200
Flow direction: positive and negative net flow. Range ratio: 150:1. Repeatability error: ± 0.1% of the measured value
Accuracy level: 0.5 level, 1.0 level (pipeline type)
Temperature of the tested medium: ordinary rubber lining:- 20～＋60℃
High temperature rubber lining:- 20～＋90℃
Polytetrafluoroethylene lining:- 30～＋100℃
High temperature PTFE lining:- 30 to+180 ℃.
Rated working pressure: Pipeline type: DN6～DN80≤1.6Mpa，DN100～DN250≤1.0Mpa，DN300～DN1200≤0.6Mpa.
Flow measurement range: The flow measurement range corresponds to a flow velocity range of 0.1-15m/s
Conductivity range: The conductivity of the measured fluid is ≥ 5us/cm (integrated type). Most media composed of water have a conductivity range of 200-800 μ s/cm, and sewage treatment flow meters can be used to measure their flow rate.
Current output: When 0-10mA, the load resistance is 0-1.5k Ω; When 4-20mA, the load resistance is 0-750k Ω
Digital frequency output: The upper limit of the output frequency can be set within 1-5000Hz with a transistor collector open circuit bidirectional output with photoelectric isolation. When the external power supply is ≤ 35V and conducting, the maximum collector current is 250mA
Power supply: 85-265V, 45-63Hz
Straight pipe length: Pipeline type: upstream ≥ 5DN, downstream ≥ 2DN
Connection method: The flowmeter and piping are connected by flanges, and the flange connection size should comply with the provisions of GB11988.
Explosion proof mark: mdIIBT4.
Environmental temperature:- 25～60℃
Relative humidity: 5% to 95%
Total power consumption: less than 20 watts.

Potassium nitrate flowmeterSelection:
1. Choose the appropriate type based on the characteristics of integrated and separated sewage treatment flow meters. The installation and wiring of the integrated sewage treatment flowmeter are convenient, with moderate accuracy, and should not be installed below the ground to prevent the converter from being submerged in water. The separated sewage treatment flowmeter has high accuracy, and the converter and sensor are installed remotely, making it more suitable for situations with poor on-site environment (such as hazardous, toxic, and easily flooded places). However, the installation and wiring are strict, otherwise interference signals may be introduced.
2. Choose the appropriate electrode form. For media that do not produce crystals, scars, or contaminate electrodes, standard electrodes can be used. Otherwise, scraper type cleaning electrodes or electrodes with cleaning connection devices can be used. For sludge testing, replaceable electrodes can also be used.
3. Select electrode materials based on the corrosiveness of the tested medium.
4. Select lining materials based on the corrosiveness, wear resistance, and temperature of the tested medium.
5. Protection level of sewage treatment flowmeter. According to the national standard GB4208-1984, which is approximately equivalent to the International Electrotechnical Commission IEC standard (IEC529-7B), the standard for the protection level of the enclosure is IP65, which is a waterproof type that allows the faucet to spray water on the instrument from any direction, with a spray pressure of 30Kpa. The water output is 0.75m3/h, and the distance between the water spray outlet and the instrument is 3m; IP67 is a waterproof type, which means that the instrument can be fully immersed in water, with the highest point at least 150cm underwater and a duration of at least 30 minutes. IP68 is a submersible type that can work underwater for a long time. According to the above regulations, instruments that are prone to flooding when installed underground should be rated IP68, while instruments installed above ground should be rated IP65.
6. Select grounding based on the insulation of the connecting instrument pipeline.
7. Select the nominal pressure of the sewage treatment flowmeter based on the highest pressure of the measured medium. For flow measurement of medium pressure levels of 10MPa, 16MPa, 25MPa, and 32MPa, high-pressure sewage treatment flow meters should be selected. Its maximum diameter is 100mm.

Appendix LDG Intelligent Series Electromagnetic Flow Meter Code List

Type spectrum											Explanation
LDG	——										Intelligent electromagnetic flowmeter
Nominal Diameter	×××										3-digit number, see attached table for details
Connection method		1									flange type
		2									Flange clamping type
		3									Hygienic
		4									plug-in
nominal pressure			1	DN1200-DN2400 (reference)							0.6MPa
			2	DN300-DN1000 (reference)							1.0MPa
			3	DN100-DN250 (reference)							1.6MPa
			4	DN15-DN80 (reference)							4.0MPa
			5								other
Electrode material				L							316L
				B							Hastelloy B
				C							Hastelloy C
				T							titanium
				V							tantalum
				P							platinum-iridium alloy
Lining material					1	DN40-DN2400					chloroprene rubber
					2	DN15-DN600					polyurethane
					3	DN15-DN1000					PTFE
					4	DN15-DN350					FEP
protection grade						1					IP65
						2	Sensor IP68, converter IP65				IP67
						3	Sensor IP68, converter IP65				IP68
Usage environment							P				Common
							B				Explosion proof type
structural style								1			Integrated
								2			split type
power supply									A		220VAC
									C		On Battery
									D		24DC
output signal										1	4-20mA/pulse
										2	4-20mA/RS485
										3	HART
										4	Wireless remote transmission

Model Code Appendix:

code	100	150	200	250	320	400	500	650	800	101	125	151	201	251	301
orifice	10	15	20	25	32	40	50	65	80	100	125	150	200	250	300
code	351	401	451	501	601	701	801	901	102	122	142	162	182	202	222
orifice	350	400	450	500	600	700	800	900	1000	1200	1400	1600	1800	2000	2200