Introduction of capacitive differential pressure transmitter :
HT3351 capacitive differential pressure sensor transmitter, the
pressure difference or pressure difference to change the
capacitance value of the sensor, the resulting analog signal
through AD conversion, into a digital signal sent to the
microprocessor.After the microprocessor calculation and processing,
the output digital signal is sent to the current control circuit
after digital-to-analog conversion, and converted into 4 ~ 20mA
analog current signal output. For small range liquid, 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.
Applications of capacitive differential pressure transmitter:
1. Suitable for the differential pressure measurement of various
gases or liquids in pipelines in petroleum, chemical, electric
power, hydrology and other industries.
2. Pipe and chamber pressure measurement.
Range:
| 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 shown in the working principle, the external pressure or
pressure difference will cause a certain change in the sensor
capacitance value. Through the digital signal conversion, it is
converted into a frequency signal and sent to the
microprocessor.After the microprocessor calculation, the current
control signal is output to the current control circuit and
converted into 4-20mA analog currentOutput.At the same time, the
microprocessor is responsible for interaction and other actions
(display and setting). The communication port for digital
communication needs our company's special port.The HART module will
implement 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:
Q1:Areyou manufactrade company?
A1:We are manufactrader with more than 29 years of experience.
Q2:Customized Product
A2:We provide OEM and Custom-Design services.
Q3:Quality Quarantee
A3:Our products have a limited 12 to 18 months warranty from
shipment date to the original purchaser.Hengtong will replace or
repair defective products free of charge.This warranty does not
apply to any units have been modified,misused,neglected.
Q4:Shipment&packing
A4:Products are generally shipped by international Express
including UPS,FedEx,DHL and INT for freight prepaid,also can use
your shipment account to collect,Standard export packing,including
inspection certification.
Q5:Contact US
A5:We have an active and experienced sales team to serve you on
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