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Address: Building 4, No.195, Gaoxin Avenue, Weibin District, Baoji City, Shaanxi Province, China
Contact name:Merlin
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Introduction of capacitive differential pressure transmitter :
BPHT3351 Capacitive differential pressure transmitter sensor , the pressure or differential pressure will make the sensor capacitance value change, the generated analog signal after AD conversion, into a digital signal sent to the microprocessor, after the microprocessor calculation and processing output a digital signal, after DA conversion to the current control circuit, converted into 4 ~ 20mA analog current signal output.
Product Features of capacitive differential pressure transmitter:
1. The transmitter adopts stainless steel structure design, compact
structure and easy installation.
2. After strict temperature compensation and aging screening, to
ensure stable and reliable performance.
3. Electrical interface can be selected as plug-in or direct wiring
option.
Applications of capacitive differential pressure transmitter:
1. Suitable for measuring differential pressure of various gases or
liquids in pipelines of industries such as petroleum, chemical,
power, and hydrology.
2. Applied in industrial on-site processes such as petroleum,
chemica,metallurgy, power generation, and hydrology.
3. Pressure measurement for pipelines and furnace chambers.
Range:
| Range code | Range | Measuring range | |
| Min. | Max. | ||
| 4 | 0.374KPa | 37.4KPa | -37.4～37.4KPa |
| 5 | 1.868KPa | 186.8KPa | -186.8～186.8KPa |
| 6 | 6.9KPa | 690KPa | -690～690KPa |
| 7 | 20.68KPa | 2068KPa | -2068～2068KPa |
| Output | Analog output: two –wire 4-20mADC |
| Digital output: two –wire 4-20mADC and superimposing variable digital signal accord with HART | |
| Power supply | supply voltage 12.5-45VDC |
| Limit load | Max load resistor Rmax in loop decided by the supply voltage, see the below drawing. HART PROTOCOL require the load resistor not less than 250Ω,not more than 600Ω |
| Communication distance | Max. 1.5Km, multi-address communication can connect 15 smart transmitters Max. |
| Display | 4 digital display,5 digit LCD display, pointer type. |
| Explosion-proof | ExiaIICT5;explosion suppression type |
| Zero offset | Can positive transfer or negative transfer, but can not overstep the utmost value |
| Temperature | ambient temperature -40-85℃(When choose LCD : -20-70℃) |
| Medium temperature | -40～104℃ |
| Static pressure and single side overpressure | 3.45KPa(absolute pressure)～31.2MPa(gauge pressure) |
| Relative humidity | 5～98%RH |
| Run-up time | less than 5 sec. |
| Capability change | Less than 0.16cm3 |
| Damp adjust | 0.20～25 second |
| Malfunction alarming | If occur malfunction, automatism diagnose function will output 3.9 or 21.0mA |
| Configuration protection | To avoid the datas are modified random, can utilize software or protect switch lock the record data |
Working Principle of capacitive differential pressure transmitter:
As indicated in the working principle, the outside pressure or
differential pressure will cause some change in the sensor
capacitance value. Through the digital signal conversion, it will
change into the frequency signal, which is sent to the
microprocessor. After the
calculation by microprocessor, a current control signal will be
output to the current control circuit, converted into analogue
4-20mA current
output. Meanwhile, the microprocessor is responsible for the
interactive and other actions (display and setting). The
communication port used for digital communication needs the special
port of our company. HART module will realize the transmitter HART
communication.
Measurement Ways of capacitive differential pressure transmitter:
Fluid Level Measurement:
In the measurement of fluid flow, the pressure taps should be
breached on the side of the process conduit to avoid the sediment
of dregs. Meanwhile, the transmitter should be mounted beside or
under the pressure taps, to prevent the air bubbles from being
discharged into the process conduit.
FQA:
