Mix of pressure measuring instrument with accessories ? Hook-up instead of 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 in the form of a ?hook-up?, an application-specific and ready-to-install solution. It eliminates all the disadvantages that users experience with the alternative to do the assembly themselves.
1. The logistical effort:
This is considerable. Measuring instruments, valves and other accessories, if they’re brought together in-house, usually must be sourced from different manufacturers, frequently from more than two companies. The order processes need to be coordinated, and this can be 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 elements of such an assembly generally come, as stated, from different manufacturers. This increases the odds 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 created by the operator themselves, on the proper, the hook-up solution from WIKA.
A good example of this, shown here, may be 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 threat 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 do not match exactly. This also carries the chance of leakage. To experience the desired compatibility, the qualification and delivery specification must be defined for every supplier with considerable effort.
Two types 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 complete 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 the requirements for the procurement of suitable components, will be the assembly charges for measuring points with instrumentation valves and accessories also added. Intense from the development of special know-how and employee training to the provision of the right workplace, including tools and the necessary materials. Furthermore, an excellent 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, it 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 really is ready for installation along the way on delivery. If necessary, a measuring instrument can be coupled with several instrumentation valves and accessories (see illustration left).
Note
Detailed information on valves and protective devices can be found on the WIKA website.

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