【Weekly Question 20090501】Transmitter Performance Metrics

In fact, Yokogawa, ABB, and Rosemount are all equally excellent in performance. It’s just a matter of seeing who offers the best price.

The transmitters in the 3015S series can achieve an accuracy of 0.0225%. Additionally, they feature the module and the single circuit board housed within a fully welded, vacuum-sealed 316L stainless steel enclosure, which helps to eliminate moisture and cope with harsh field conditions.

I once had an exchange with Beijing Far East, and now I’d like to share some of the key figures from that exchange. The stability performance of 3051 is guaranteed for 5 years; the drift does not exceed 0.1%, while the accuracy can reach 0.065%. The range ratio is 100:1, and diaphragms are available in sizes from 1/4 to 4 inches. Additionally, the operating temperature range for silicone oil is from -101 degrees Celsius to 400 degrees Celsius, offering a longer transmission distance than that of any other manufacturer.

The Rosemount 3051 smart transmitter is part of the smart instrument series produced by the American company Rosemount; it can be used for measuring pressure, temperature, level, and flow. The high-performance 3051 series intelligent transmitters are the most widely used transmitters at present. The Rosemount smart transmitters use the HART protocol to transmit both digital signals and 4-20mA analog signals. It is capable of transmitting digital information of the measured values expressed in engineering units, with 14 different engineering units available for selection. At the same time, Rosemount also offers 3051 series transmitters that use the Foundation Fieldbus standard. The 3051 series transmitters can operate under quite generous environmental conditions, and can be used in temperatures ranging from -40 to 85°C ； Certifications with various protection levels. The 3051 series transmitters can be maintained using a handheld operator or the AMS device management system. The various types of transmitters in the 3051 series differ in terms of application areas, measurement range, signal output format, material used for structural components, material of the isolation diaphragm, size of the mounting bracket, and material of the gauge housing; accordingly, different model options are available, allowing users to choose the one that best suits their actual needs. List of 3051 Transmitters: Model, Type, Range, Accuracy, Sensor
3051CD: Differential pressure transmitter; Range: 0.12–13800 kPa; Accuracy: 0.075%; Sensor type: Capacitive
3051CG: Gauge pressure transmitter; Range: 0.62–13800 kPa; Accuracy: 0.075%; Sensor type: Capacitive
3051CA: Absolute pressure transmitter; Range: 8.6 mmHg–27580 kPa; Accuracy: 0.075%; Sensor type: Capacitive
3051HD: High-temperature differential pressure transmitter; Range: 0.62–13800 kPa; Accuracy: 0.075%; Sensor type: Capacitive
3051HP: High-temperature gauge pressure transmitter; Range: 0.62–13800 kPa; Accuracy: 0.075%; Sensor type: Capacitive
3051TG: Gauge pressure transmitter; Range: 13800–68900 kPa; Accuracy: 0.075%; Sensor type: Piezoelectric
3051TA: Absolute pressure transmitter; Range: 13800–68900 kPa; Accuracy: 0.075%; Sensor type: Piezoelectric
3051L: Level transmitter; Range: 0.62–2070 kPa; Accuracy: 0.075%; Sensor type: Capacitive
3051PD: Reference-grade differential pressure transmitter; Range: 0.62–248 kPa; Accuracy: 0.05%; Sensor type: Capacitive
3051PG: Reference-grade gauge pressure transmitter; Range: 0.62–13800 kPa; Accuracy: 0.05%; Sensor type: Capacitive
3051S: New model transmitter; Accuracy: 0.05%; Sensor type: Capacitive

Key technical specifications of the 3051 transmitter:
– Excellent measurement performance, suitable for all applications related to pressure, level, and flow measurement.
– Stability: 0.25%, over a period of ±5 years.
– Outputs: Standard 4–20 mA signals, HART protocol digital signals, or FF protocol digital signals.
– Update rate: 20 times per second.
– Range ratio: 100:1

Although transmitters from various manufacturers can all be used, there are still differences among them. It is mainly reflected in whether a complete range of transmitters is available for different applications, such as those in high-temperature and high-pressure environments, with corrosive media, crystallizing media, or ultra-low temperature conditions, etc. There are also transmitters with wireless transmission capabilities and those that support the HART protocol; it’s important to be able to find products suitable for all these applications within one series ； The second issue is the zero drift of the transmitter; some transmitters perform poorly over time due to significant zero drift ； Thirdly, it is necessary to consider whether spare parts are provided in a timely manner and whether the technical support capabilities are adequate.

Stable performance is the most important; of course, accuracy is also a factor.

Rosemont’s transmitters are good, but they are also expensive; you get what you pay for. In fact, as long as it’s from a major manufacturer, the quality is generally good; each brand has its own characteristics, and the cost-performance ratio is more or less similar.

Oh no! Regarding the advantages of the Rosemount 3051 series, as well as the reputation of the Rosemount brand and its technical support, everything that came to mind has been mentioned above. As for transmitters from other manufacturers, aside from those from Yokogawa, their exterior design and manufacturing quality are simply not appealing.

Model 3051 has good stability; temperature and pressure have little impact on it. Its accuracy is generally 0.065%, though it is also possible to achieve a precision of 0.04%. There is also one with 2051 precision, at 0.065% as well, but it’s cheaper.

Our unit uses Rosemount 3095 multi-variable transmitters, which are quite good. Temperature compensation can be done at the field level, or it can also be carried out in the DCS system. The throttling element used is a butterfly valve; the parameters need to be set according to the characteristics of the butterfly valve, and the size of the disc cannot be determined using the settings for orifice plates. Otherwise, the differences in the measurement results will be too large! ! !