Let's talk about the differences between the Rosemount 3051 pressure transmitter and the ABB 2600T series transmitters.

In the transmitter market, the Rosemount 3051 pressure transmitter and the ABB 2600T series transmitters are both very well-known foreign brands. Their quality is very stable, and their accuracy is also very high. Today, Huibo Electromechanical will discuss the differences between these two transmitters from the aspects of sensor technology, electronic devices, and display heads.
First, let's take a look at the Rosemount 3051C pressure transmitter.
1. Sensor Diaphragm
The flexibility of the co-planar sensor diaphragm of the Rosemount 3051C is most suitable for the sensor technology required for pressure measurement. Figure 1 shows two types of the 3051C sensor diaphragm. The sensor maintains mechanical, electrical, and thermal isolation from the process medium and external environment. The sensor is moved away from the process flange to the neck of the electronic housing, achieving mechanical and thermal isolation. This design prevents the sensor from direct contact with process heat sources and relieves mechanical stress on the sensor cup, which can improve static pressure performance. The glass-sealed pressure transmission tube is insulated from the sensor cup, ensuring electrical insulation, which can enhance the flexibility, performance, and transient voltage protection capability of the electronic circuit.
The 3051C sensor diaphragm also measures temperature to compensate for temperature effects. During the factory's characterization process, all sensors undergo pressure and temperature cycling tests across the entire working range. Correction factors are generated based on the data obtained, which are then stored in the memory of the sensor diaphragm, ensuring that the transmitter can accurately correct signals during operation.
The memory of this type of sensor diaphragm also helps speed up the maintenance process. Since all characteristic values of the diaphragm are stored within it, the circuit board can be replaced directly without the need for recalibration or removing a separate PROM that stores correction factors. There is also a circuit board inside the sensor diaphragm that directly converts the input capacitance and temperature signals into digital signals for further processing by the electronic board module.
2. Electronic Circuit Board
The electronic board uses dedicated integrated circuits (ASIC) and surface mount technology. This board receives digital input signals and their correction factors from the sensor diaphragm, then corrects and linearizes the signals. The output section of the electronic board module converts the digital signals into analog output and communicates with the HART handheld device. The standard 3051 model analog output is 4-20mA, while the low-power transmitter has a voltage output (1-5V or 0.8-3.2V). An optional LCD display can be plugged into the electronic board to display digital outputs in pressure, flow, or liquid level engineering units or as a percentage of the analog range, available for both standard and low-power transmitters.
3. LCD Display
M5 digital display, 2 lines, 5 digits LCD display
● Directly displays digital data with higher accuracy
● Displays flow, liquid level, volume, or pressure units as per user requirements
● Displays diagnostic information for on-site troubleshooting
● The panel has alarm and safety protection jumper pins, making it easier to use alarm and safety protection functions
● Can be rotated 90°, facilitating installation
M6 digital display with 316 stainless steel cover
Used in conjunction with stainless steel housing (housing codes J, K, and L)
Local range and zero point adjustment
As a standard configuration, the transmitter comes with local range and zero point adjustment buttons
● Non-interactive external zero point and range adjustment, easy to calibrate
● Buttons replace standard potentiometers for adjustment to achieve optimal performance
J1 only has local zero point adjustment
J3 has no local zero point and range adjustment settings
Next, let's take a look at the relevant parameters of the ABB 2600T series transmitters.
1. Sensor Technology
The ABB 2600T transmitter series offers field-proven sensors that ensure optimal reliability for all process applications and measurement types:
Differential pressure, gauge pressure, and absolute pressure
Liquid level, flow, volume, density, and liquid level interface
Mass flow and standard volume flow
2. Electronic Devices
If the electronic device needs to be replaced, the self-configuration feature ensures that all functions are stored within one minute.
On-site upgradeable communication protocols without additional tools
The following communication protocols can be used:
HART 4--.20 mA
PROFIBUS PA
FOUNDATION Fieldbus
Modbus
3. Display Head
Integrated displays and real-time output displays are available. ABB field indicators allow for on-site configuration of devices (integrated display) without opening the display cover. Configuration/troubleshooting can be done via CoMeter or the remotely installed (695 field indicator) CoMeter.
--- Can serve as an economical alternative to HART handheld terminals.
Multi-parameter Transmitter
Using a unique combination method, multiple sensors are concentrated in one transmitter, allowing for simultaneous measurement of differential pressure and absolute pressure.
Additionally, temperature sensor measurements and recordings can be used for service or diagnostics. In addition to pressure parameters, connecting external temperature sensors also allows for process temperature measurement. Therefore, the transmitter can use differential pressure methods to measure flowing gases, steam, and liquids. Through fluid dynamics calculations, considering the type of main component and the working density of the fluid (a function of pressure and temperature), the actual mass flow can be directly output (in accordance with AGA3 or DIN EN ISO 5167 regulations).
Multi-functional: A single transmitter can output three measurement values.
Modular: Replaceable electronic components with self-configuration capabilities.
Globally applicable: National and international certification certificates.
The world's most precise multi-parameter transmitter - a unique multi-parameter transmitter with a 0.04% parameter, capable of communication via FOUNDA-TION fieldbus or PROFIBUS PA protocol.