Product description of strain type pressure transmitter:
Compact pressure transmitter pt500-503
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;
Supporting standard four core shielded cable;
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), 0-20mA (three wire system), 0-5vdc, 0-10vdc, 0.5-4.5vdc (three wire system);
Specification parameter
1、 Product specifications:
Measuring medium: liquid and gas (compatible with connecting materials of product process)
Pressure form: gauge pressure, absolute
pressure
Range: 0 - 0.6 - 60MPa (within the range)
-0.1 - 0 - 0.6-5mpa
-100KPA - 10KPA - 40MPa (within the range)
±10KPA to ±100KPA
Comprehensive accuracy: ± 0.25% FS; ± 0.% FS; ± 1% FS
Non linear: ≤ 0.25% FS
Repeatability: ≤ 0.1% FS
Output signal: 4-20mA (two-wire system);
0-20mA (three wire system)
0-5vdc; 0-10vdc (three wire system)
0.5-4.5vdc (three wire system) / 5VDC power supply available
Power supply voltage: 24VDC (9-30vdc) / 5VDC for output of 0.5-4.5vdc
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
Failure pressure: 5 times of range (range less than 5MPa); 3 times of range (range greater than 5MPa)
Electrical connection: Hersman (din34650)
Protection grade: IP65
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...
Ordering considerations
1. Product range selection:
A. 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:
B. Range = x (1.2-1.5) times of the maximum system pressure;
C. The actual measuring pressure range of the product should be 15% - 80% of the range;
2. Signal output mode of the product:
A. The signal output specification depends on the requirements of the back-end acquisition equipment;
B. Common are: control and display instrument, PLC acquisition and input module, MCU acquisition card, PC serial port, etc
C. 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:
A. Indoor or outdoor installation;
B. Ambient temperature;
C. Required sealing level;
D. Vibration range of equipment;
E. Installation method: thread, flange, special structure;
F. Whether the installation space meets the overall dimension of the product;
Precautions for use
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 connected according to the specifications of the ordered products. When installing the products, the stressed part shall be "process connection hexagon wrench position", and the wrench specifications shall correspond 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 body product is installed in a ventilated, dry and non corrosive environment. It is installed in the open with protective devices to avoid direct sunlight;
Common problem
Question 1: no output from pressure transmitter?
Reason/processing method
The power line is connected reversely according to the operation manual / 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 replace cable
Transmitter amplifier board burned out, repaired or replaced
Question 2: is the output of pressure transmitter less than 3.92mA or less than 0VDC?
Reason/processing method
The power supply voltage is less than the required value. The normal minimum power supply voltage is 9VDC. Check the voltage value
The power of power supply is not enough. Does the power of power supply meet the requirements of rated load
Excessive load of acquisition circuit check circuit load
If the pressure value exceeds the minimum range value, is negative pressure formed at the pressure tap of the transmitter
Repair or replace the pressure transmitter amplifier board after burning out
Impact or overpressure core damage repair or replacement
Question 3: pressure transmitter output ≥ 22mA or 5.5VDC/10.5VDC?
Reason/processing method
The power supply voltage is less than the required value. The normal minimum power supply voltage is 9VDC. Check the voltage value
The power of power supply is not enough. Does the power of power supply meet the requirements of rated load
The pressure value exceeds the maximum range value. Check the loading pressure of the pressure transmitter
Repair or replace the pressure transmitter amplifier board after burning out
Impact or overpressure core damage repair or replacement
Question 4: unstable pressure transmitter output?
Reason/processing method
Unstable pressure source check whether the pressure of the pressurization system is stable
There is no grounding wire. The 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 to replace the cable routing position
Transmitter water inlet or steam transmitter is not powered down into the temperature box, heating 65 degrees for drying
Cleaning of stone sand or sundries in pressurized pipeline
If the pressure medium temperature is too high, check whether the medium temperature is within the allowable range of the transmitter
Question 5: how to install and replace the pressure transmitter?
Reason/processing method
Install (because the cable is not detachable) 1. Install the pressure transmitter first
2. Test whether the process connection of pressure transmitter is sealed
3. Arrange pressure transmitter cable routing
4. Connect the power on test output of acquisition instrument or equipment
5. Normal operation? Disassembly or replacement is reversed from the above installation steps