Gauge pressure transmitter with remote diaphragm seal 266GRT

Overview

Thanks to Taylor’s “All-Welded” technology in remote seal manufacturing as well as to the longstanding expertise, 266GRT can offer unmatched total performances and a wide selection of options such as fill fluid, diaphragm material, capillary protection and mounting connections. ABB, leader in severe process measurements, is able to provide the right solution for the most critical process media at extreme ambient and process conditions. With a long-term stability and its proven reliability, 266GRT represents the best application solution for gauge pressure measurements.

In addition to the plug-in terminal block, this transmitter features in-field replaceable electronics module that thanks to the auto-configuration functionality dramatically improves plant productivity. Its intuitive plug-and-play display with easy setup procedure really helps users by saving time and lowering maintenance and inventory costs. Moreover, the innovative TTG (Through The Glass) technology allows users to configure the instruments in the field without removing the windowed front cover and consequently to save a lot of time.

The 266GRT is certified by TUV NORD for use in safety instrumented systems as per the requirements of IEC61508. The transmitters meet the requirements for SIL2 applications in a single transmitter configuration (1oo1) and for SIL3 applications in a redundant configuration (1oo2).

Typical Applications of ABB 266GRT Gauge Pressure Transmitter

The ABB 266GRT is used when a standard gauge pressure transmitter cannot be directly exposed to the process medium. The remote diaphragm seal separates the transmitter sensor from the medium and transfers pressure through a filled capillary system.

This design is especially useful for process conditions involving high temperature, corrosion, viscosity, crystallization, contamination or difficult installation positions.

Common applications include:

Gauge pressure measurement for corrosive liquids, gases or steam
Open tank liquid level measurement
Pressure measurement for high-temperature process media
Chemical and petrochemical process pressure monitoring
Applications where the transmitter must be mounted away from the process connection
Media that may block impulse lines or damage a direct-mounted sensor
Severe process applications requiring special diaphragm materials or fill fluids
Why Remote Diaphragm Seals Are Used

A remote diaphragm seal is used to protect the transmitter and improve measurement reliability under difficult process conditions. Instead of allowing the medium to enter the transmitter directly, the pressure is applied to a diaphragm and transferred through fill fluid to the measuring sensor.

For 266GRT applications, the selection of diaphragm material, fill fluid, capillary length and process connection is very important. These factors can affect response time, temperature influence, zero shift and long-term measurement stability.

Compared with a direct-mounted gauge pressure transmitter, the 266GRT is more suitable when the measuring point is hot, corrosive, hard to access or requires a separated transmitter installation.

Selection Information Required for Quotation

To confirm the correct ABB 266GRT configuration or prepare a quotation, please provide the following information:

Existing model code or nameplate photo
Measured medium
Process pressure range
Process temperature
Process connection type and flange rating
Diaphragm material requirement
Fill fluid requirement
Capillary length
Capillary protection requirement
Mounting position
Output signal, such as 4–20 mA HART
Display requirement
Hazardous area or SIL requirement

If the transmitter is used for open tank level measurement, please also provide the tank height, liquid density, installation position and whether the tank is vented to atmosphere.

SIY Electric Supply Support

SIY Electric can help customers confirm ABB 266GRT model configuration based on existing model codes, datasheets, nameplate photos or process conditions. We can support quotation, replacement selection, equivalent model comparison and remote diaphragm seal configuration review.

For project procurement or maintenance replacement, please send us the model code, technical specification sheet or photos of the existing transmitter nameplate. This helps us check the pressure range, diaphragm seal type, capillary length, fill fluid, process connection and approval requirements more accurately.