Overview:
EJA differential pressure transmitterUsing microelectronic processing technology (MEMS), two H-shaped resonant beams with consistent shape, size, and material are fabricated at the center and edges of a single crystal silicon chip surface. The resonant beams oscillate at high frequencies in a self-excited oscillation circuit. When the upper and lower surfaces of a single crystal silicon wafer are subjected to unequal pressure, deformation will occur, resulting in a decrease in the frequency of the central resonant beam due to compressive force and an increase in the frequency of the edge resonant beam due to tensile force.
feature
● World * - Monocrystalline Silicon Resonant Sensor
Adopting advanced micro electro mechanical processing technology (MEMS)
The sensor directly outputs frequency signals, simplifying the interface with digital systems
High precision, generally ± 0.075%
● High stability and reliability
The impact after 100000 consecutive overvoltage tests is ≤ 0.03%/16MPa
Continuous work for five years does not require zero point adjustment
● Three communication protocols are available for selection in the BRAIN/HART/FF fieldbus
● Comprehensive self diagnosis and remote communication settings
Can be installed and used directly without the need for a three valve group
The material of the liquid receiving membrane for the basic product is Hastelloy C-276 (small standard is 3.9kg)
● External zero/range calibration
Verification method:
1. When installing the eja pressure transmitter, looseness often occurs. The transmitter is connected to the three valve group, and the bolts should be tightened diagonally. Generally, they cannot be locked at once. When installing the three valve group, the sealing coil should be encrypted.
2. Correctly connect the receiver operator, set the transmitter content according to requirements, and adjust the zero position.
3. Set the function items of the calibrator. First, reset the calibrator to zero, connect the pressure pipeline, and pay attention to the positive and negative pole connections. Connect the standard resistor. Check the circuit current.
4. Accuracy verification of eja pressure transmitter: Place the fine adjustment valve in the middle position, close the shut-off valve and the check valve, set the output pressure of the electric pressure test bench, calibrate the basic error (5 points up and 5 points down), and record the data in a timely manner.
5. For the operation of the three valve group: first open the balance valve and correctly open the high-pressure valve.
6. Equipment reset and organization: deactivate the three valve group, power off, remove circuit connections and related equipment, start and close the pressure control console, open the shut-off valve and check valve.
7. Accurately calculate errors and backlash, provide correct verification conclusions, and provide correct verification conclusions.