Pressure transmitters and pressure gauges could 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 to do the assembly themselves.
1. The logistical effort:
This is considerable. Measuring instruments, valves along with other accessories, if they are brought together in-house, usually ought to be sourced from different manufacturers, frequently from more than two companies. The order processes must be coordinated, that 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 components of such an assembly generally come, as stated, 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 right, the hook-up solution from WIKA.
A good example of this, shown here, may be the combination 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). In such a case, the connection can be achieved via an assembly with two pipe pieces and four adapters. But this solution escalates the outlay in time and expense, and also the risk 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 usually do not match exactly. This carries the risk of leakage. To experience the required 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 process 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 regarding flange connections).
3. Price :
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. 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, 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 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 really is ready for installation in the process on delivery. If necessary, a measuring instrument can even be combined with several instrumentation valves and accessories (see illustration left).
Note
Detailed home elevators valves and protective devices can be found on the WIKA website.