Intelligent transmitter is our company's introduction of advanced foreign technology and equipment Key raw materials, components, and parts are all imported, and the entire machine undergoes strict assembly and testing. Due to the complete integration of the two most popular and widely used transmitters in China (Rosemount 3051 and Yokogawa EJA) in the appearance of this model, it gives users a refreshing feeling. At the same time, it is easily compatible with traditional products such as 1151 and can be directly replaced during installation, making it a replacement and update product for some old products, while also having intelligent functions of HART fieldbus protocol.
feature
The 3351 intelligent transmitter can adjust the range/zero point locally Alternatively, the 388 or 275 intelligent handheld device (imported with HART communication protocol) can be used to achieve full adjustment of the intelligent transmitter, as well as software selection to complete the application of square root or linear output, and has self diagnostic function.
Imported key components with stable performance Reliable quality And the price is moderate
High accuracy: 0.1% 0.2%. 0 25%.0. 5% optional
The maximum range ratio is 15:1
※ Adjustable damping (electrical damping is 0-6S)
The minimum circuit resistance required for communication is 2500
※ Full range of specifications: The minimum range is from 0~125Pa to the maximum range of 0~40MPa, which can be freely selected
※ Multiple varieties: Micro differential pressure DR type, differential pressure DP type, high static pressure HP type, flow DP type Pressure GP type, pressure TG type, absolute pressure AP type, liquid level individual type, cross remote transmission flange type (capillary length 1.0~7.51m optional)
※ Positive and negative migration: positive migration 500%, negative migration 600%
※ Output signal: 2-wire 24VDC power supply, 4-20mADC output (can also be 4-wire 220VAC power supply, 0-10mADC output)
Explosion proof: Intrinsic safety type iallCT6, explosion-proof type dIIBT4
Good pressure resistance: general pressure resistance of 14MPa, high static pressure resistance of 32MPa
※ Corrosion resistance: 316L and Monel can be provided Corrosion resistant transmitters made of materials such as Hastelloy and Tantalum
※ With on-site indicator table
① 31/2-digit LCD display
② Pointer based linear or square root indication 0-100%
※ Flange standard: ANSI 3 ", 4" 150LB~600LB (can also be customized according to customer requirements)
working principle
The process pressure is transmitted to the center measuring diaphragm of the delta chamber through the isolation diaphragm on both sides or one side, and the filling liquid. The central membrane is a tensioned elastic element that acts on it The pressure difference on both sides of the capacitor generates corresponding deformation displacement, which is proportional to the differential pressure, with a maximum displacement of about 0.1mm. This displacement is transformed into a differential capacitor formed on the capacitor plate, which is converted into a 4-20mADC output signal in a two-wire system by electronic circuits. (See Figure 1)
Functional Parameters
※ Target audience: liquids, gases, and vapors
Measurement range: 0-0 1kPa to 0-40MPa
Output signal: 4-20mA DC (special can be four wire 220V AC power supply. 0-10mA DC output)
※ Power supply: 12~45V DC. - Typically 24V DC (see Figure 2 for load characteristics)
※ Load characteristics: Related to the power supply, the load carrying capacity at a certain power supply voltage is shown in Figure 2. The relationship between load resistance RL and power supply voltage VS is: RL ≤ 50 (Vs-12)
Indicator: pointer type linear indication with 0-100% scale and LCD display.
※ Explosion proof: a. Explosion proof dIIBT4
b. Intrinsic safety type iallCT6
※ Range and zero point: externally continuously adjustable
Positive and negative transfer: After the zero point undergoes positive or negative transfer, the absolute values of the upper and lower limits of the range and measurement range cannot exceed the measurement range 100% of the upper limit. The maximum positive transfer is 500% of the minimum calibration range, and the maximum negative transfer is 600% of the minimum calibration range
※ Temperature range: Amplifier operating temperature range: -29~+93C (LT type: -25~+70C) Measuring element filled with silicone oil: -40~+104 ° C Flange transmitter filled with high-temperature silicone oil:+15~+315 '° C Ordinary silicone oil: -40~+149 ° C
※ Static pressure: 4 10. 25 32MPa
※ Volume suction capacity:<0.16cm3
※ Damping (step response): When filled with silicone oil, it is generally continuously adjustable between 0.2S and 1.67S
Technical data
(Without migration, under standard working conditions, filled with silicone oil, 316 stainless steel isolation diaphragm)
Accuracy: 0.1% 0.2%. 0.25%. 0 5%.
Dead zone: None (≤ 0.1%)
Stability: Absolute value of basic error not exceeding the maximum range within six months
Vibration effect: In any axial direction, the error is+0.05%/g of the upper limit of the measurement range when the vibration frequency is 200Hz
※ Power supply impact: less than 0.005%/V of the output range
※ Load impact: If the power supply is stable, the load will not be affected
other
Isolation membrane: 316L stainless steel, Hastelloy C, Monel alloy, tantalum, or 316L+PTFE
Exhaust/drain valve: 316 stainless steel, Hastelloy C. Monel alloy
※ Flanges and fittings: 316 stainless steel, Hastelloy C or Monel alloy
Contact medium "O" ring: Nitrile rubber, Fluororubber
※ Filling fluid: silicone oil or inert oil
※ Bolt: 316L stainless steel
Electronic casing material: low copper aluminum alloy
※ Pressure connector: flange 1/4NPT. Center distance 54MM; connector 1/2NPT or M20x 1.5 male threaded ball cone seal, center when equipped with connector Distance from 50.8, 54 57.2mm (NPT taper pipe thread in accordance with GB/T12716-91)
※ Signal line connection hole: G1/2 '. M20x1.5
Weight: 3.9kg (standard type)
Establish cargo instructions
The transmitter model can be determined according to the selection specification table as needed.
The numbers and symbols in the selection specification table must be filled in clearly and accurately
If there is positive or negative migration, the migration amount value must be indicated.
If a differential pressure transmitter needs to be equipped with a three valve group and a throttling device Please specify separately. .
The transmitter is calibrated according to the range specified by the user. If the user does not specify, the transmitter will be calibrated to the maximum range, and this calibration will be conducted at room temperature and atmospheric pressure.
When it is necessary to indicate the workstation number, it should be indicated when ordering.
When selecting a remote transmitter, it should also be determined according to different remote flange selection tables as needed.
If the remote transmitter is to be used in vacuum and high temperature environments, it should be specially marked when ordering.
The materials for the contact medium O-ring include nitrile rubber and fluororubber.