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

Pressure transmitters and pressure gauges can be adapted to nearly every 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 of doing the assembly themselves.
1. The logistical effort:
That is considerable. Measuring instruments, valves and other accessories, if they’re brought together in-house, usually should 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 aren’t standard solutions. Both components of this assembly generally come, as mentioned, from different manufacturers. This increases the probability of complications during assembly.
The difference in these measuring arrangements with differential pressure gauges is obvious ? on the left, a good example of an assembly made by the operator themselves, on the proper, the hook-up solution from WIKA.
An example of this, shown here, is the mix of a differential pressure gauge with a valve manifold. The bond 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 increases the outlay with time and expense, and also the threat of leakage, by doubling the sealing points (see arrow marks). Difficulties in assembly also arise if the tolerances of the connection interfaces from different suppliers do not match exactly. This carries the risk of leakage. In order to achieve the desired compatibility, the qualification and delivery specification must be defined for every supplier with considerable effort.
Two examples of hook-up solutions:
Left: Pressure gauge with overpressure protector, a valve to separate the measuring instrument from the procedure and a siphon tube that protects the entire measuring arrangement from excessive temperatures.
Right: Pressure gauge with overpressure protector and monoflange (this enables separation of measuring instrument and process in the case of flange connections).
3. The installation effort:
On top of certain requirements for the procurement of suitable components, are the assembly charges for measuring points with instrumentation valves and accessories also added. These add the development of special know-how and employee training to the provision of the right workplace, including tools and the required materials. Furthermore, an excellent control is mandatory to check on the functionality and reliability of the measuring arrangement, especially its leak tightness. Mainstream is especially important if, for instance, 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 valves and protective devices can be found on the WIKA website.

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