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9.
product performance and indicators
9.1
Basic Functions
Low frequency square wave excitation and high frequency excitation are optional:
50Hz power supply mode: 3.125Hz, 4.167Hz, 6.250Hz
60Hz power supply mode: 1.667Hz, 2.500Hz, 5.000Hz
• Excitation current is 125mA (must be selected for high frequency excitation), 187mA, and 250mA;
• Empty pipe measurement function without additional electrodes, continuous measurement, fixed value alarm;
• Velocity measurement range: 0.1 - 15 m/s, velocity resolution: 0.5 mm/s;
• AC high frequency switching power supply, voltage applicable range: 85VAC - 250VAC
• 24VDC switching power supply, voltage application range: 20VDC - 36VDC;
• Network function (optional): MODBUS, Current loop communication, GPRS, PROFIBUS
• English, Chinese display mode (can customize other languages)
• There are two totalizer totals which can record separately: forward total and reverse total
9.2
Special Functions
Infrared remote-control operation keyboard, long-distance non-contact operation of all functions of the converter.
9.3
Normal Working Conditions
Ambient Temperature: Split Type +14 - +140
°
F
(-10 - +60
°
C)
Humidity:
5% - 90%
Power Supply:
Single-Phase AC85 - 250VAC, 45 - 63Hz
Power Dissipation:
less than 20W (after connecting the sensor)
9.4
Connection Method with Sensor
Integrated round case: round case, the case is directly connected to the sensor flange.
9.5
Sensor Matching Requirements
Sensor signal sensitivity: at a flow rate of 1 m/s, the sensor outputs 150µV - 200µV;
For the FaraMag FM750 electromagnetic flow meter converter, four (4) 62.5mA currents are used in the excitation
circuit to form 250mA. Each 62.5mA current is controlled by a 20Ω precision resistor. Therefore, the user can choose
a different magnitude of the excitation current by changing the number of precision resistors.
The converter is set to 250mA current when it leaves the factory. Similarly, if there are three (3) precision resistors, it
corresponds to 187.5mA; and if it has two (2) precision resistors, it corresponds to 125mA.
Sensor excitation coil resistance: 250mA excitation current: 50 - 60Ω
187mA excitation current: 60 - 80Ω
125mA excitation current: 100 - 120Ω
