Simplified stock handling
Most machine and system manufacturers use display pressure switches, which, in addition to the switching outputs, also require analog outputs (for example 4 ... 20 mA, 0 ... 10 VDC) at various measuring points. Depending on the measuring point, the devices might differ only by means of the set switching points and the measuring range and consequently the analog signals. To facilitate the reduction of spare parts for maintenance, the Trafag display pressure switch DPC and DPS is ideal; besides the very simple parameterization by stored parameter sets, the 2:1 turn-down capability also helps to keep the spare parts to a minimum. It is possible to adjust the measuring range down to 50% of the nominal range as desired via the parameter sets, thus scaling the desired analog signal to the individual measuring range.
The parameters can be adapted without power to the instrument! NFC (Near Field Communication), and not Bluetooth or WLAN, acts as the interface. This allows the replacement service or the service personnel to parameterize the instruments out of the box and unpowered. Otherwise it is also possible to check whether the correct parameter set is stored in the device before installation.
Easy re-parameterization in the service case
In addition to the above-mentioned advantages, the need for service is also simplified by the direct access of the employee to the device parameters - without intervention in the control system. Thus, as a first error analysis, an employee of the operator can send the set parameters by e-mail to the customer service, which then checks whether the settings are correct. Another feature which is very useful in this case is the integrated logging function of the DPC / DPS, which records the applied trend of pressure and stores it in the device. This measured data can also be transferred via the NFC as a CSV file (Comma-separated Values) to the smartphone. This file may be sent by e-mail and be evaluated, for example by Excel, for system diagnostics.
In addition to system diagnostics, the integrated logger function offers even more interesting applications. For simple experimental setups - whether in the development of prototypes and function patterns, in testing or in laboratory experiments at colleges and universities - can be constructed without any additional equipment for measuring data acquisition: It only requires the connection of the DPC / DPS to a corresponding voltage supply, in order to then readout the measured data via the app. To connect the DPC / DPS display pressure switch to any power socket, Trafag offers a complete kit, available with a matching case and power adapter. Because the acquisition of pressure measurement data can be installed within a few minutes, the acquisition of measured data is also possible in situations where the installation of a conventional measurement data acquisition would not be worthwhile or where it would not be possible for logistical reasons (for example, because the service technician for the diagnosis can arrive with only limited luggage).