Thread Content
The Rosemount series of pressure transmitters/differential pressure transmitters are primarily used to measure the level, density, and pressure of liquids, gases, or vapors, and then convert these values into 4–20 mA DC signals for output. The Rosemount SD3051 can communicate with the HART475 handheld communicator, which is used for setting it up and monitoring it. Next, we will briefly introduce the performance specifications of the Rosemount series of pressure transmitters within the zero-basis calibration range, under reference conditions of silicone oil filling and a 316L stainless steel diaphragm. Firstly, the reference accuracy of Rosemount series pressure transmitters is ±0.1% of the calibrated range ； Stability: 6 months, ±0.1% URL ； Secondly, the following factors that affect the Rosemount series of pressure transmitters are discussed: 1. Influence of installation location: The zero drift of Rosemount series pressure transmitters is at most ±0.25 kPa. All zero-point drifts can be corrected ； It has no impact on the range at any time ； Second, vibration effect: For Rosemount series pressure transmitters, the vibration effect at 200 Hz in any axial direction is ±0.05% URL/g ； Third, load effect: Rosemount series pressure transmitters are not affected by load, unless there is a change in supply voltage ； Fourth, influence of ambient temperature: zero-point error: ±0.2% URL/56℃ ； Overall error: ±(0.2% URL + 0.18% verification range)/56℃ ； Fifth, power supply influence: less than ±0.005% of output range per volt ； Sixth, electromagnetic interference/radio frequency interference (EMI/RFI effects): Within the range of 20 to 1000 MHz, and with a field strength of up to 30 V/M, the output drift of Rosemount series pressure transmitters remains below ±0.1% of the full scale ； Seventh, the effect of static pressure: there are two impacts. The first is the zero point: for a range of 4 to 8, it is ±0.25% URL at kPa, while for range 3 it is ±0.5% URL. The zero-point error of Rosemount series pressure transmitters can be corrected online through zero adjustment ； Next is the range: it can be calibrated to ±0.2% of the output reading/6895 kPa. For range 3, it can be corrected to ±0.25%, with the output reading of Rosemount series pressure transmitters being /6895 kPa. Advantages The Rosemount 3051 two-wire transmitter uses an advanced output method for analog signals, and it boasts 6 key advantages: 1. Ordinary capacitive interference can cause errors related to the receiver resistance. In the 4-20mA two-wire circuit of the Rosemount 3051 transmitter, the receiver resistance is typically 250Ω (with a sampled Uout of 1–5V). This low resistance is not sufficient to cause significant errors; as a result, it allows for longer wire lengths compared to voltage telemetry systems ； 2. The Rosemount 3051 series transmitters with a two-wire system allow each individual reading or recording device to be connected to different channels, regardless of the length of the wires; this prevents accuracy differences due to variations in wire length ； 3. When the output resistance of the current source is high enough, the voltage induced in the wire loop due to magnetic field coupling has little effect on Rosemount 3051 series transmitters, as the current caused by interference sources is minimal; in most cases, using twisted pair wiring can reduce such interference ； 4. The Rosemount 3051 series transmitters are not susceptible to the effects of parasitic thermocouples, resistance drops along the wires, and temperature drift; they can use much cheaper, thinner twisted-pair wires ； 5. The 4mA output from the Rosemount 3051 series transmitters is used as the zero level, which makes it very convenient to determine whether the conveyor line is open or the sensor is damaged (0mA condition). 6. Surge and lightning protection devices can be added to the two-wire output terminals of the Rosemount 3051 series transmitters, which helps to ensure safety against lightning strikes and explosions. Features Above, we introduced the six comprehensive functions and 6 key advantages of the Rosemount 3051 series transmitters. In this article, we will continue to discuss four features of the Rosemount 3051 series transmitters: 1. The Rosemount 3051 series transmitters feature high-level insulation between the primary and secondary sides ； 2. The Rosemount 3051 series transmitters feature four key advantages: high reliability, high precision, high stability, and excellent cost-performance ratio ； 3. The Rosemount 3051 series of transmitters are widely used, especially in intelligent monitoring systems for load currents in generators, motors, low-voltage distribution cabinets, air conditioners, fans, street lights, and other devices ； 4. The Rosemount 3051 series transmitters feature ultra-low power consumption: 0.096 W when at rest, 0.48 W at full scale, and 0.6 W due to internal limitations on the output current; as a result, they have a long service life and low cost.