Drainage flowmeterProduct Features
. Drainage flowmeterThere are no movable parts or flow blocking components inside the pipeline, and there is almost no additional pressure loss during measurement.
The measurement results are related to physical parameters such as flow velocity distribution, fluid pressure, temperature, density, viscosity, etc.
On site, the range can be modified online according to the actual needs of the user.
Using SMD devices and surface mount technology, the circuit has high reliability.
. Drainage flowmeterAdopting a 16 bit embedded microprocessor, it has fast computing speed, high accuracy, programmable low-frequency rectangular wave excitation, improved stability of flow measurement, and low power consumption.
Full digital processing, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to 150: 1.Drainage flowmeterUltra low EMI switching power supply, suitable for a wide range of power supply voltage changes, with good EMI resistance performance.
There are three integrators inside that can display the forward cumulative amount and the differential cumulative amount respectively. There is also a non power down clock inside that can record 16 power down times. (Optional)
Equipped with RS485 Output digital communication signals such as RS232, Hart, and Modbus. (Optional)
It has self checking and self judging functions.



Drainage flowmeterMain technical parameters
. Nominal diameter series DN (mm)
Pipeline type 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. Repetitive error: ± 0 of the measured value. 1% accuracy level: 0.5 level, 1.0 level (pipeline type) measured medium temperature: 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 。
Drainage flowmeterFlow 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), and most media composed of water have a conductivity in the range of 200-800 μ s/cm. Acidic 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 conducting, the maximum collector current is 250mA.
. Drainage flowmeterPower supply: 85 ～ 265V ， 45-63Hz.
Length of straight pipe section: 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% ～ 95%
Total power consumption: less than 20 watts.
Drainage flowmeterRequirements for Liquid Conductivity
Using an integrated electromagnetic flowmeter^[5]The premise is that the tested liquid must be conductive and cannot be lower than the threshold (i.e. lower limit). Conductivity below the threshold will result in measurement errors that make it unusable. Even if it changes beyond the threshold, it can still be measured with little change in indication error. The threshold of a universal integrated electromagnetic flowmeter is between 10-4 and (5 × 10-6) S/CM, depending on the model. When used, it also depends on the length of the flow signal line and its distributed capacitance between the sensor and the converter. The manufacturer's instruction manual usually specifies the length of the signal line corresponding to the conductivity. A non-contact capacitive coupled large-area electrode instrument can measure liquids with conductivity as low as (5 × 10-8) S/CM.
The conductivity of industrial water and its aqueous solutions is greater than 10-4 s/cm, and there is no problem with the conductivity of acid, alkali, and salt solutions ranging from 10-4 to 10-1 s/cm. There is also no problem with the conductivity of low distilled water ranging from 10-5 s/cm. Petroleum products and organic solvents cannot be used if their electrical conductivity is too low. According to the information, some pure liquids or liquids with low conductivity are considered unusable. However, in practical work, there may be instances where impurities can be used due to their presence, which are beneficial for increasing conductivity. For aqueous solutions, the conductivity in the data was measured in the laboratory using a pure water ratio. The actual aqueous solution used may be mixed with industrial water, and the conductivity will be higher than the measured value, which is also beneficial for flow measurement.
There is also a type of liquid that cannot be measured by an integrated electromagnetic flowmeter installed on a pipeline in the absence of readily available conductivity data. Samples are taken offline from the on-site pipeline to the laboratory to measure its conductivity using a conductivity meter, but it is considered usable. This is because the liquid measured during the offline sampling process has already differed from that in the pipeline, for example, the liquid has absorbed CO2 or NOx from the atmosphere to generate trace amounts of carbonic acid or nitric acid, which has changed the conductivity.
Drainage flowmeterConverter technology data

power supply	exchange	85～265V，45～400Hz
	direct-current	11～40V
	lithium battery
Operation keys and display	Touch-tone	Four thin film buttons can be used to set and select all parameters, and the converter can also be programmed using a PC (RS232); 3-line LCD with wide viewing angle, wide temperature, and backlit display; The first line displays the traffic value; The second line displays the flow unit; The third line displays the percentage of traffic, total forward, total reverse, total difference, alarm, and flow rate.
	Magnetic key type	Two magnetic keys are used for selecting and resetting display parameters, and the converter is programmed using a PC (RS232); 2-line LCD with wide viewing angle, wide temperature, and backlit display: Line 1: Magnetic key selection: Display flow percentage, forward total amount, reverse total amount, difference total amount, alarm, flow rate. Line 2: Display traffic.
Internal integrator	Positive total, negative total, and differential total.
output signal	Unidirectional analog output	Fully isolated, load ≤ 600D. (at 20mA); Upper limit: 0-21mA optional, 1mA per level; Lower limit: 0-21mA optional, 1mA per level; Programming for forward and reverse flow output modes.
	Bidirectional analog output	The lower limit is. Or 4mA, other same unidirectional analog outputs.
	Bidirectional pulse output	Two outputs correspond to forward and reverse flow rates, with a frequency range of 0-800Hz and an optional upper limit of 1-800Hz. Each level is 1Hz; Square wave or selected pulse width, with an upper limit of 2.5S and 1ms per level; Passive isolation transistor switch output, capable of absorbing 250mA current and withstanding 35V voltage.
	Dual channel alarm output	Programmable alarm for high/low flow rate, air traffic control, fault status, forward and reverse flow rate, analog over range, pulse over range, pulse small signal cutoff, with optional output polarity; Transistor switch output with isolation protection, capable of absorbing 250mA current and withstanding 35V voltage (Not isolated from pulse output)
digital communication		RS232，RS485，HART

Drainage flowmeter
Selection of lining

Lining material	Performance	Maximum medium temperature		scope of application
		All-In-One	separated
Polytetrafluoroethylene (F4)	It is the most chemically stable plastic and can withstand boiling.	70℃	100 ℃ 150 ℃ (special order required)	1. Strong corrosive media such as concentrated acid and alkali. 2. Sanitary media.
Perfluoroethylene propylene (F46)	Same as F4, its wear resistance and negative pressure resistance are higher than F4.		ditto
Polyfluoroethylene (Fs)	The upper limit of applicable temperature is lower than that of polytetrafluoroethylene, but the cost is also lower.		80℃
neoprene	1. Has excellent elasticity, high tensile strength, and good wear resistance. 2. Resistant to corrosion in general low concentration acid, alkali, and salt media, but not resistant to corrosion in oxidizing media.		80 ℃ 120 ℃ (special order required)	Water, sewage, and weakly abrasive slurry.
polyurethane	1. Extremely strong wear resistance. 2. Poor corrosion resistance.		80℃	Neutral strong abrasion slurry, coal slurry, mud

If there are any problems during the installation process, the technical service personnel of Jiangsu Jinhu Kaiming Instrument Co., Ltd. will conduct on-site positioning and solve them.
After the installation and debugging of the product are completed, and after a period of trial operation, if the normal operation of the user's business can be ensured, the product acceptance can be carried out jointly by the user and service personnel. During the acceptance process, service personnel from Jiangsu Jinhu Kaiming Instrument Co., Ltd. should provide users with documents such as product acceptance checklist, product configuration, daily maintenance manual, and solutions to common problems. After the user signs and approves, the installation service ends. The subsequent product work will enter the after-sales service period of the product.