Circuit board module
The circuit board module of the transmitter is a circuit board using application-specific integrated circuit and surface packaging technology. The circuit board receives the signal from the sensor and corrects and linearizes it. The output part of the circuit board module converts the digital signal into an analog output signal, and the HART transmitter can communicate with the HART hand operator or the upper computer software.
1.2.1 A/D conversion
The A/D conversion circuit uses a 16-bit low-power integrated circuit to convert the analog current output by the demodulator into a digital current, which is provided to the microprocessor as an input signal.
1.2.2 Microprocessor
The microprocessor of the transmitter controls the conversion of A/D and D/A, and can also complete self-diagnosis and realize digital communication. At work, a digital pressure value is processed by a microprocessor and stored as a number to ensure precise corrections and conversion of engineering units. In addition, the microprocessor can also complete the sensor linearization, range ratio, damping time and other functions.
1.2.3 EEPROM memory
EEPROM stores all configuration, characterization and digital fine-tuning parameters, the memory is non-volatile, so even if the power is off, the stored data can still be intact to achieve intelligent communication at any time.
1.2.4 D/A conversion
D/A conversion converts the corrected digital signal sent by the microprocessor into a 4-20mA analog signal and outputs it to the loop.
1.2.5 Digital communication
The transmitter is tested and configured using a communicator. Or through any host system that supports HART communication protocol to complete the communication. HART protocol uses the industry standard BELL202 frequency phase shift keying (FSK) technology, with 1200Hz or 2200Hz digital signal superimposed on the 4~20mA signal to achieve communication, communication, the frequency signal on the 4~20mA process does not produce any interference.

Functional parameter
Medium of use: liquid, gas and steam.
Measuring range: See product certificate and label.
Output signal: two-wire 4 ~ 20Ma DC or superimposed HART number on 4 ~ 20Ma DC
Word signal, by the user free choice of linear output or root output (differential pressure).
Power supply: The power supply is 12 ~ 45VDC, and the general working power supply is 24VDC.
Load: The maximum load resistance RL of the circuit board is: RL = (Vs-12V)/0.023A,
In the formula, RL: the maximum load resistance Ω, the maximum RL is 600Ω during communication; Vs: Power supply
Voltage V.

Range and zero position: The transmitter can be adjusted by in-place button or by adopting HART
The communicator is adjusted remotely.
Positive and negative transfer: Differential pressure transmitter: The maximum positive transfer is the upper limit of the measurement range (URL
The same as below) difference from the measuring range; The maximum negative migration is URL. Pressure transmitter: Max
The positive transfer value is the difference between the URL and the measured range.
Absolute pressure transmitter: the maximum positive transfer is the difference between the URL and the measured range; no-load
Migrate.
Fault alarm: The self-diagnostic program detects a fault with an analog output higher than 22mA or lower
At 3.9mA alarm, alarm high and low sign can be selected by electronic component switch.
Transmitter state write protection: Toggle a switch on an electronic component to prevent transmitter configuration
The change.
Temperature range: Electronic circuit: -30 ~ +85℃

Sensitive element (filled with silicone oil): -40 ~ +104℃ (filled with inert oil): -184 ~ +71℃
Storage temperature: -30 ~ +85℃
Starting time: maximum damping < 2s
Volume absorption: < 0.16 cm3
Damping: Electrical damping is 0 ~ 16s, can be adjusted at 0.1s interval, sensitive element (charge
Silicone oil) natural time 0.2s, range code 3 damping time is 0.4s.

Packing & Delivery


FAQ
1. Q: What information need to be provided to choose the suitable model?
A: Application field, Nominal pressure ,Medium & medium temperture , Power supply , Output,
Flow range, Accuracy, Connection and other parameters.
2. Q: Are you a trade company or a manufacturer?
A: We are an ISO approved manufacturer specialized in level and flow measuring instruments.
OEM & ODM service are available. Welcome to visit us in China.
3. Q: What is your MOQ?
A: To start our cooperation, sample order is acceptable.
4. Q: What is your delivery date for the Intelligent Mini Micro Turbine Fuel Oil Diesel Flow Meter?
A: The delivery date is about 3-15 working days after receipt of payment.
5. Q: What is your payment terms?
A: We support T/T, PayPal ,Western Union.
For mass production order, it is 30% deposit in advance and 70% balance before shipment.
6. Q: Do you have a warranty for the Flow Meter?
A: Yes, we have the warranty of 12 months.