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 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 choice of doing the assembly themselves.
1. The logistical effort:
This is considerable. Measuring instruments, valves and other accessories, if they are brought together in-house, usually must be sourced from different manufacturers, frequently from a lot more than two companies. The order processes must 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. Uplifting of such an assembly generally come, as stated, from different manufacturers. This escalates 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 made by the operator themselves, on the right, the hook-up solution from WIKA.
An example of this, shown here, may be the combination of a differential pressure gauge with a valve manifold. The bond of the measuring instrument includes 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, plus 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 required compatibility, the qualification and delivery specification must be defined for every supplier with considerable effort.
Pay Zero 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 regarding flange connections).
3. The installation effort:
On top of the requirements for the procurement of suitable components, will be 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 a suitable 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. This is especially important if, for instance, it is just a process with critical gases.
Vulnerable 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 even 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.

Leave a Comment