Combination of pressure measuring instrument with accessories ? Hook-up instead of own assembly

Pressure transmitters and pressure gauges can be adapted to almost any process condition using valves, protective devices and/or fittings. WIKA offers such combinations by means of a ?hook-up?, an application-specific and ready-to-install solution. It eliminates all of the disadvantages that users experience with the choice to do the assembly themselves.
1. The logistical effort:
This is considerable. Measuring instruments, valves along with other accessories, if they’re brought together in-house, usually ought to be sourced from different manufacturers, frequently from a lot more than two companies. The order processes ought to be coordinated, which is often time-consuming. Furthermore, supplier management requires additional resources.
2. Compatibility problems (risk of leakage):
Combinations of pressure measuring instruments with instrumentation valves and accessories are not standard solutions. Both components of such an assembly generally come, as stated, from different manufacturers. This increases the likelihood of complications during assembly.
The difference in these measuring arrangements with differential pressure gauges is obvious ? on the left, an example of an assembly created by the operator themselves, on the right, the hook-up solution from WIKA.
A good example of this, shown here, is the mix of a differential pressure gauge with a valve manifold. The connection of the measuring instrument has a different centre distance than that of the selected valve manifold (picture left). When this happens, the connection may be accomplished via an assembly with two pipe pieces and four adapters. But this solution escalates the outlay with time and expense, as well as the risk of leakage, by doubling the sealing points (see arrow marks). Difficulties in assembly also arise if the tolerances of the bond interfaces from different suppliers usually do not match exactly. This also carries the risk of leakage. In order to achieve the desired compatibility, the qualification and delivery specification should be defined for each supplier with considerable effort.
Two examples of hook-up solutions:
Left: Pressure gauge with overpressure protector, a valve to split up the measuring instrument from the procedure and a siphon tube that protects the complete measuring arrangement from excessive temperatures.
Right: Pressure gauge with overpressure protector and monoflange (this permits separation of measuring instrument and process regarding flange connections).
3. The installation effort:
On top of certain requirements for the procurement of suitable components, are the assembly costs for measuring points with instrumentation valves and accessories also added. These range from the development of special know-how and employee training to the provision of the right workplace, including tools and the necessary materials. Furthermore, a quality control is mandatory to check on the functionality and reliability of the measuring arrangement, especially its leak tightness. This is especially important if, for example, this is a process with critical gases.
Avoidance of risks
With a hook-up solution, users circumvent the efforts and potential risks described here. The measuring arrangement is assembled at WIKA (based on the specified process parameters and the installation situation) from qualified individual parts and is tested for leaks. It is ready for installation along the way on delivery. If necessary, a measuring instrument can also be combined with several instrumentation valves and accessories (see illustration left).
Note
Detailed info on Imminently and protective devices are available on the WIKA website.

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