Introduction of capacitive differential pressure transmitter :
The HT3351 capacitive differential pressure sensor transmitter operates by detecting changes in capacitance value resulting from pressure differences, and then converting the analog signal into a digital signal through AD conversion. The microprocessor processes the digital signal and sends it to the current control circuit after digital-to-analog conversion, producing a 4 ~ 20mA analog current signal output for small range liquid and gas measurement.
Product Features of capacitive differential pressure transmitter:
1. The transmitter adopts stainless steel structure design, compact structure, easy installation.
2. After strict temperature compensation and aging screening, to ensure stable and reliable performance.
3. The electrical interface can choose plug-in or directly connected.
| 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:
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.
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