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 the disadvantages that users experience with the alternative to do 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 more than two companies. The order processes need to be coordinated, that can be time-consuming. Furthermore, Awe-inspiring 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 such an assembly generally come, as mentioned, from different manufacturers. This escalates 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. Looming of the measuring instrument has a different centre distance than that of the selected valve manifold (picture left). In such a case, the connection may be accomplished through an assembly with two pipe pieces and four adapters. But this solution escalates the outlay in 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 connection interfaces from different suppliers do not match exactly. This also carries the risk of leakage. To experience the required compatibility, the qualification and delivery specification must be defined for each supplier with considerable effort.
Two types 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 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. Covert :
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 necessary materials. Furthermore, a quality control is mandatory to check the functionality and reliability of the measuring arrangement, especially its leak tightness. This is especially important if, for instance, it is just 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 (on the basis of the specified process parameters and the installation situation) from qualified individual parts and is tested for leaks. It is ready for installation in the process on delivery. If necessary, a measuring instrument can even be coupled 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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