The Field Display from MHT Technology Ltd combines years of experience and expertise in legacy field bus technologies and protocols to bring an intelligent field display that can interface to a wide range of different vendors’ sensors, transmitters and instruments. Where traditionally instruments from different vendors have had proprietary interfaces and protocols demanding separate displays for each instrument, this unit can display all their data through one integrated unit.
The device can also display data from more than one tank. Consequently, the cost of providing field indication in tank gauging and tank inventory applications can now be significantly reduced. A single Field Display can accept serial data inputs from up to a maximum of 4 different field bus technologies. The currently available field bus technologies are:-
- Enraf BPM
- Saab TRL/2
- Whessoe Current Loop
- Sakura (E+H) V1
- Motherwell 2800
- Scientific Instruments LTD
- Whessoe 1146 LTD
- Modbus RTU
Displays exist to show the main data items available from each of the above devices as well as the ability to drill down into more detailed information for each instrument.
Typically the Field Display is configured to listen to data on a field bus produced by a client polling multiple server devices. By enabling the Field Display’s fallback mode, if the client system fails it can take over as client maintaining the display of data and even allowing the user to initiate gauge commands from the display.
In Listen mode the device can automatically build a map of all instruments on the field bus through a learning mode. The user can then configure via the display which tank each detected device belongs to. A gauge emulation feature, which supports many protocols, allows legacy systems to interoperate with new instrumentation. The Field Display has applications in Refineries, Oil Terminals and Depots, LNG storage and the wider bulk liquid storage industry. Its ability to capture data from multiple field bus technologies simplifies installation, reduces costs, and improves operational performance.
The Field Display features a graphical LCD display to clearly present the data from each instrument. A menu structure allows the user to navigate the various displays using a magnetic key attached to the display.
Field Display, tank display
Field Display, Ex
Field Display, LNG display
Control in the Field
SWEAT YOUR ASSETS
Field display complies with ATEX and IECEx Zone 1 requirements. Produced in the UK from a manufacturer with over 15 years experience of designing and manufacturing solutions for explosive atmospheres.
LISTEN MODE – One to many
The Field Display will tap into existing Fieldbus signals and display the data polled from the connected field devices. These readings can be used to build a map of all detected field devices when ‘Learning Mode’ is also configured.
The Field Display will send gauge commands and display data of all field devices connected to its Fieldbus ports whilst set as master. It can also be configured to service requests from another master device simultaneously.