Precia-Molen has recently supplied A-Gas (UK) Ltd with weighing systems for three vertical storage vessels plus a platform scale for gas cylinders.
A-Gas (UK) Ltd is based in Portbury West, Bristol and operates as an international business in the distribution of speciality chemicals such as refrigerants, insulation agents, industrial gases and other products including propellants and solvents for use in industries operating in the Refrigeration, Insulation, Solvent, Manufacturing and Medical sectors.
The project involved the supply of weighing systems for three large vertical storage vessels in an area classified as a Zone 2 hazardous area (according to the ATEX Directive), with the platform scale located in a safe (non ATEX) area.
For the installation Precia-Molen supplied twelve Silo Load Mounts with ATEX certified Model 460 load cells providing a four cell arrangement for each vessel which offers better stability under high wind-loads. Manufactured in stainless steel and sealed IP68 the assemblies were delivered ‘locked up’ allowing the erection of the vessel directly onto the mounts without the requirement for ‘dummy load cells’ during installation.
Each vessel is equipped with an ATEX certified weight transmitter Model I400 TB EX 2-21 which is connected via a high-speed data bus to an I 400 D-MS Operator terminal located in the safe area adjacent to the cylinder scale.
The low profile platform cylinder scale supplied by Precia-Molen was purpose-designed with two ‘saddles’ to support the drum and rather than having a separate transmitter, the I400 D-MS indicator is equipped with an internal ADC module connected to the platform scale.
Normally the operator will use the I400 D-MS terminal to monitor the cylinder weight but due to the network architecture the same terminal can be used to display the individual vessel weights as well as being used to set-up and calibrate any of the weighing channels.
The weighing channels are integrated with the client’s automation system via an RS485 Modbus network allowing access to real-time weight data for efficient plant operation.
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