JD090 Intelligent Electromagnetic Flow ConverterDetailed product description：

Detailed information
The JD090 intelligent electromagnetic flow converter is a high-precision and high reliability product that has been continuously upgraded and improved. This flowmeter has reached the domestic level in excitation technology and intelligent technology. Can be matched with various flow sensors produced by our company

characteristic
·Programmable low-frequency rectangular wave excitation improves the stability of flow measurement and reduces power loss;
·Adopting a 16 bit embedded microprocessor, the computing speed is fast. High precision;
·All digital processing, strong anti-interference ability, reliable measurement, high accuracy, and a flow measurement range of up to 1500:1;
·Ultra low EMI switching power supply, suitable for a wide range of power supply voltage changes. Good EMC resistance performance;
·Full Chinese character menu operation, easy to use, simple to operate, easy to learn and understand;
·High definition backlit LCD display;
·It has bidirectional flow measurement and bidirectional total accumulation functions, and bidirectional output functions for current and frequency;
·There are three integrators inside that can display forward cumulative quantity, reverse cumulative quantity, and differential cumulative quantity respectively;
·Capable of outputting digital communication signals such as RS485 or HART;
·Air traffic control detection function;
·The constant current excitation current has a wide range and can be used in conjunction with different companies and types of electromagnetic flow sensors;
·Equipped with self checking and self diagnostic functions;
·Adopting SMD devices and surface mount (SMT) technology, the circuit has high reliability;
·The internal design of the instrument includes a non power failure clock that can record 16 power failure times.

Technical performance indicators of JD090 intelligent electromagnetic flow converter
Execution standard: JB/T 9248-1999 Electromagnetic flowmeter.
Supporting sensor nominal longitude range: DN3~DN3000
Flow measurement range: The flow velocity at the upper limit of the flow measurement range can be selected within the range of 0.3m/s to 15m/s, and the flow velocity at the lower limit can be 1% of the upper limit. The flow accuracy under reference conditions is shown in Table 5.2.

Diameter mm	Range m/s	accuracy
3~20	Below 0.3	± 0.25%FS
	0.3～1	± 1.0R
	1~15	± 0.5%R
25~600	0.1～0.3	± 0.25%FS
	0.3～1	± 0.5%R
	1~15	± 0.3%R
700~3000	Below 0.3	± 0.25%FS
	0.3～1	± 1.0%R
	1~15	± 0.5%R
%FS: relative range; %R: Relative measurement values.

Vs: Set range (m/s) Table 5.2
Repetitive error: ± 0.1% of the measured value
current output
a) Current output signal: bidirectional two-way, fully isolated 0-10mA/4-20mA.
b) Load resistance: 0-1.5k Ω when 0-10mA; 0-750 Ω when 4-20mA.
c) Basic error: Add ± 10 μ A to the above measurement basic error.
Frequency output: forward and reverse flow output, with an upper limit of output frequency that can be set within 1-5000Hz. Open circuit bidirectional output of transistor collector (O, C) with photoelectric isolation. The external power supply should not exceed 35V, and the maximum collector current when conducting is 250mA.
Pulse output: forward and reverse flow output, with an output pulse upper limit of up to 5000cp/s. The pulse equivalent is 0.0001-1.0m3/cp. The pulse width is automatically set to 20ms or square wave. Open circuit output of transistor collector (O, C) with photoelectric isolation. The external power supply should not exceed 35V, and the maximum collector current when conducting is 250mA.
Flow direction indication output: This flowmeter can measure the fluid flow rate in both directions and determine the direction of fluid flow. When displaying forward flow, output a high level of+10V, and when displaying reverse fluid flow, output a low level of 0V.
Alarm output: Two transistor collector open circuit alarm outputs with photoelectric isolation. The external power supply is not greater than 35V, and the maximum collector current when conducting is 250mA. Alarm status: fluid empty pipe, excitation disconnection, flow rate exceeding limit.
Serial communication: Optional RS232C or RS485 serial communication interface, with lightning protection.
Damping time: selectable in stages between 0 and 100 seconds (90% time).
Electrical isolation: The insulation voltage between analog input and analog output shall not be less than 500V;
The insulation voltage between the analog input and the alarm power supply shall not be less than 500V;
The insulation voltage between the analog input and the AC power supply shall not be less than 500V;
The insulation voltage between the analog output and the AC power supply shall not be less than 500V;
The insulation voltage between the analog output and the ground shall not be less than 500V;
The insulation voltage between the pulse output and the AC power supply shall not be less than 500V;
The insulation voltage between the pulse output and the ground shall not be less than 500V;
The insulation voltage between the alarm output and the AC power supply shall not be less than 500V;
The insulation voltage between the alarm output and the earth shall not be less than 500V;