Chip:
Imported brand pressure sensitive chip wafer;
Selected chip technology and fully sealed package;
Core:
Diffused silicon core, high sensitivity, large output, zero point, full range compensation, temperature compensation, suitable for small range pressure transmitter;
Strain gauge core, high-strength elastic deformation pressure sensing material, equipped with temperature compensation, has the advantages of impact resistance and fatigue resistance, suitable for general range pressure transmitter;
Ceramic core, outstanding anti-corrosion performance, with zero point, full range compensation, temperature compensation; suitable for measuring medium with strong corrosive working conditions, range less than 5MPa;
Structure:
Small overall structure, diversified process connection modes (thread M20, M16, M12, G1 / 4, G1 / 2, 1 / 2NPT, 1 / 4NPT, flange connection, quick joint, welding, etc.)
Standard electrical connection interface: Hersman din34650
Process connection material: 304 or 316;
Shell material: 304 or 316;
Standard four core shielded cable for pressure measurement
Signal processing:
24 bit ADC sampling processing chip;
DSP digital signal conditioning algorithm;
Multipoint line temperature calibration;
Voltage and current overload protection;
Standard industrial signal output: 4-20mA (two-wire system);
Four LED display integrated instrument, on-site real-time display pressure value, display range: - 1999 - 9999;
Intelligent fire control
Smart city
Oil pressure system
Air supply system
Petroleum Pipeline
Constant pressure water supply
Measurement medium: liquid and gas (compatible with product process connection materials)
Pressure form gauge pressure, absolute pressure
Range: 0-0.6-60mpa
-0.1～0～0.6～5MPa
-100KPa～10KPa～40MPa
±10KPa～±100KPa
Comprehensive accuracy ± 0.25% FS; ± 0.5% FS; ± 1% FS
Nonlinear ≤ 0.25% FS
Repeatability ≤ 0.1% FS
Output signal 4-20mA (two-wire system)
Display instrument: four digit display, display range: - 1999 - 9999
Power supply voltage: 24VDC (9-30vdc)
Insulation impedance ≥ 1000m Ω / 100VDC
Load impedance current output: ≤ 800 Ω; voltage output: ≥ 50K Ω
Medium temperature - 20-80 ℃
Ambient temperature - 20-70 ℃
Compensation temperature 0-70 ℃
Response time ≤ 5ms
Overload pressure 150% FS
5 times of range (range less than 5MPa); 3 times of range (range greater than 5MPa)
Electrical connection Hersman (din34650)
IP 65
Connecting cable: four core shielded cable, standard length: 3M
Connection material 304 / 316L
Process connection m20x1.5, G1 / 2, G1 / 4, ZG1 / 4, 1 / 4NPT, ZG1 / 2, G3 / 8, m12x1.5
2、 Specification and model
1. Product range selection:
In order to achieve the best effect of product accuracy, life, stability and other functions, the range selection of the product is calculated by referring to the following formula:
Range = x (1.2-1.5) times of the maximum system
pressure;
The actual measuring pressure range of the product
should be 15% - 80% of the range;
2. Signal output mode of the product:
The signal output specification depends on the
requirements of the back-end acquisition equipment;
Common are: control and display instrument, PLC
acquisition and input module, MCU acquisition card, PC serial port, etc
If the back-end acquisition equipment is determined
according to the output specification of the product, it is recommended to use
the general two-wire system 4-20mA;
3. The user should understand the measurement medium characteristics
of the product:
Medium specification, medium temperature, medium
purity (whether containing impurities or particles, etc.);
4. Users should understand the installation
environment and installation method of the product:
Indoor or outdoor installation;
Ambient temperature;
Required sealing level;
Vibration range of equipment;
Installation method: thread, flange, special
structure;
Whether the installation space meets the overall
dimension of the product;
5. Whether the display resolution of the product meets
the use requirements of the equipment;
Display range of display instrument: - 1999 – 9999,
with variable decimal point;
6. The output signal of the product instrument display
is only one of 4-20mma two-wire system, without signal output of other
specifications (such as voltage 0-5vdc or 0-10vdc output);
Product power supply 24VDC (range:
9-30vdc);
It is strictly prohibited to use
hard objects (such as screwdriver, finger, iron nail, etc.) to make the
pressure core body under pressure measurement output;
The power and signal wires shall
be correctly wired according to the specifications of the ordered products;
When the product is installed, the
stressed part is "process connection hexagon wrench position", and
the wrench specification corresponds to hexagon;
It is strictly prohibited that the
medium temperature, pressure range and excitation voltage of the tested system
exceed the rated use range of the transmitter;
Pay attention to protect the
outgoing cable of the transmitter. When the span is too large on site, it is
recommended to use metal pipe for protection or overhead;
The pressure transmitter is a
precision measuring instrument. Do not impose impact or smash to avoid damaging
the core
The product is installed in a
ventilated, dry and non corrosive environment, and installed in the open with
protective devices to avoid direct sunlight;
No water or water leakage is
allowed for the product instrument, and protective devices shall be installed
in the open air to avoid direct sunlight;
Question 1: no output from pressure transmitter?
Reverse connection of power line: wiring according to the requirements of product instruction / product certificate / product label；
Poor wiring of electrical connector: disassemble the electrical connector and check whether the wiring of each terminal pin is firm；
Cable open circuit: replace cable；
Transmitter amplifier board burnt out: repair or replacement；
Question 2: pressure transmitter output ＜ 3.92ma?
The power supply voltage is less than the required value: the normal minimum power supply voltage is 9VDC, check the voltage value；
Insufficient power of power supply: whether the power of power supply meets the requirements of rated load；
Excessive load of acquisition circuit: check the circuit load；
Pressure value exceeds the minimum range value: whether negative pressure is formed at the pressure tap of the transmitter；
Pressure transmitter amplifier board burned out: repair or replacement；
Impact or overpressure core damage: repair or replace；
Question 3: pressure transmitter output ≥ 22mA?
The power supply voltage is less than the required value: the normal minimum power supply voltage is 9VDC, check the voltage value；
Insufficient power of power supply: whether the power of power supply meets the requirements of rated load；
Pressure value exceeds the maximum range value: check the loading pressure of pressure transmitter；
Pressure transmitter amplifier board burned out: repair or replacement；
Impact or overpressure core damage: repair or replace；
Question 4: unstable pressure transmitter output?
Unstable pressure source: check whether the pressure of the pressurization system is stable；
No grounding wire: pressure transmitter and equipment are grounded；
The installation position of the transmitter has a large magnetic field: install a shield or replace the installation position；
The cable is too long and passes through the magnetic field: replace the cable routing position；
Transmitter water or steam: put the transmitter into the temperature box when the transmitter is not powered on, and heat it to 65 ℃ for drying；
Stone sand or sundries in pressurized pipeline: cleaning；
Question 5: is there no display on the indicator head of the pressure transmitter, incomplete display characters, and character jumping?
No display with current output: LED or LCD display broken, repair or replace；
Incomplete display characters: water, poor contact or faulty welding, repair or replacement；
Character runout: the vibration of the installation position exceeds the allowable range or the contact is poor, repair or replace；
Display garbled Code: program error or water inflow, etc., repair or replace；
Question 6: the output of the pressure transmitter is abnormal after the load is connected?
Output current is very small at 0 pressure: input impedance of load exceeds 500 ohm；
The output current is very small when the pressure is 0: the power of the power supply does not meet the requirements of the sensor；
Output current exceeds 15mA at 0 pressure: power supply does not meet sensor requirements；
No output at 0 pressure: whether the power supply and signal are connected reversely, and there is no corresponding seat；Tel：0757-26619568 Fax： 0757-26619508
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