ST3351(3051/1151）Intelligent capacitive intelligent transmitter
overview
The ST3351 (3051/1151) miniaturized series capacitive transmitter is a product of 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. It has the characteristics of advanced design principles, complete varieties and specifications, and easy installation and use. Due to the complete integration of two popular and widely used transmitters (Rosemount 3051/1151 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 1151, CECC and other series products in installation and can be directly replaced, so it is a replacement and update product for some old models. In order to adapt to the continuous improvement and development of domestic automation level, this series of products not only has a compact and exquisite design, but also introduces intelligent functions with HART fieldbus protocol.

Characteristics ● High precision; ● Good stability; ● Two wire system (special four wire system is available); Solid components, plug-in printed circuit boards; Small, lightweight, sturdy and vibration resistant; ● Range and zero point can be continuously adjusted externally; Positive migration can reach 500%; Negative transfer can reach 600%; ● Adjustable damping; Good one-way overload protection characteristics; No mechanical movable parts, low maintenance workload; The entire series has a unified structure and strong interchangeability of components; The membrane material in contact with the medium can be selected; (316L, TAN, HAS-C, MONEL and other corrosion-resistant materials) Explosion proof structure, all-weather use; Intelligent HART fieldbus protocol. Explosion proof mark: ExiaICT6 Ga

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 diaphragm is a tensioned elastic element that produces corresponding deformation displacement in response to the pressure difference acting on it on both sides. Its displacement 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 two-wire 4-20mA DC output signal 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 system) 220V AC power supply, 0~10mA DC output Power supply: 12-45V DC, usually 24V DC (See Figure 2 for load characteristics)

● Load characteristics: Related to the power supply, the load capacity at a certain power supply voltage is shown in Figure 3. The relationship between load impedance 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 grade: a: Explosion proof type (Exd Ⅱ BT5 or Exd Ⅱ CT6)
b: Intrinsic safety type (Exia Ⅱ CT6 or Ex ib Ⅱ CT6)
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 100% of the upper limit of the measurement range.
*The transfer amount is 500% of the minor calibration range; *The large negative transfer is 600% of the small calibration range
● Temperature range: Operating temperature range: -20~+88 ℃, (LT type: -25~+70 ℃)
Measuring element filled with silicone oil: -40~+104 ℃
When filling high-temperature silicone oil into flange type transmitters:+15~+315 ℃, ordinary silicone oil: -40~+149 ℃
Static pressure: 4, 10, 25, 32MPa
● Humidity: Relative humidity is 0~100% RH
● Volume change:<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: ± 0.2%, ± 0.25%, ± 0.5%,
Dead zone: None (≤ 0.1%)
Stability: Within six months, the absolute value of the basic error should not exceed * large range
Vibration influence: In any axial direction, when the vibration frequency is 200Hz, the error is ± 0.05%/g of the upper limit of the measurement range
Power supply impact: less than 0.0059%/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-276, Monel alloy, titanium or tantalum
Exhaust/drain valve: 316 stainless steel, Hastelloy C, Monel alloy
● Flanges and fittings: 316 stainless steel, Hastelloy C or Monel alloy
Contact medium "0" ring: nitrile rubber, fluororubber
● Filling fluid: silicone oil or inert oil
Bolt: 316L stainless steel
Electronic casing material: low copper aluminum alloy
● Pressure connection line: flange NPT1/4 center distance 54mm; joint NPT1/2 or M20 × 1.5 male threaded ball cone seal, with center distance of 50.8, 54, 57.2mm when equipped with joint (NPT cone pipe thread complies with GB/T12716-91)
● Signal line connection hole: G1/2
Weight: 3.5kg (standard type, excluding options)
Outline dimension installation and connection diagram

statement：
Recently, some illegal merchants in society have stolen our company's early use and engaged in commercial activities online using our unique product models, which constitutes infringement and seriously disrupts the market, deceiving consumers. To prevent customers from being deceived, we hereby declare that the TR-800 series product models are exclusively owned by Henan Tianrun Measurement and Control Instrument Co., Ltd. Our company has not set up any distribution agents in any region of China, and all orders and shipments are directly completed from the manufacturer! Please identify Henan Tianrun Measurement and Control Instrument Co., Ltd. to avoid being deceived!








On site wire connection diagram and circuit block diagram






Intelligent Circuit Block Diagram










Transmitter Model Naming Diagram







Detailed Classification Table of Transmitter Varieties






Ordering Notice

1) The transmitter model can be determined according to the selection specification table as needed. 2) The numbers and symbols in the selection specification table must be filled in clearly and accurately. 3) If there is positive or negative migration, the migration amount value must be indicated. 4) If a differential pressure transmitter needs to be equipped with a three valve group and a throttling device, it should be noted separately. 5) The transmitter is calibrated according to the range specified by the user. If the user does not specify, the transmitter will be calibrated to a large range, and this calibration will be performed at room temperature and atmospheric pressure.

6) When it is necessary to indicate the workstation number, it should be indicated when ordering. 7) When selecting a remote transmission transmitter, it should also be determined according to different remote transmission orchid selection tables as needed. 8) If the remote transmitter is to be used in vacuum and high temperature environments, it should be specially marked when ordering. 9) The materials for the contact medium O-ring include nitrile rubber and fluororubber.