In maintenance, every minute counts. Production downtime, unnecessary service interventions, or increased energy consumption can quickly lead to significant costs. In many cases, the real challenge is not the repair itself, but identifying the root cause of a problem quickly and accurately.
The DPI705E provides maintenance and service personnel with a compact precision pressure indicator specifically designed for these tasks. The following practical examples illustrate typical applications from everyday industrial environments.
Compressed Air Leak Causes Rising Energy Costs
A manufacturing facility notices that its compressor system is running significantly more often than in the past. At the same time, energy costs continue to increase. However, no visible or audible leaks can be detected.
To narrow down the cause, the affected section of the compressed air network is isolated from the rest of the system and tested for leaks using the DPI705E. After only a few minutes, the leak test function reveals a continuous pressure loss.
| Time | Pressure |
|---|---|
| Start | 7.00 bar |
| After 2 minutes | 6.96 bar |
| After 5 minutes | 6.89 bar |
| After 10 minutes | 6.78 bar |
The pressure drop clearly confirms the presence of a leak. During the subsequent inspection, a leaking fitting hidden behind a machine enclosure is discovered.
Result
- Leak quickly located
- Compressor run times reduced
- Energy costs lowered
- Unnecessary troubleshooting avoided
Pressure Transmitter Delivers Incorrect Process Values
In a process plant, the control system indicates a pressure of 12 bar. Several operators suspect that the actual pressure is higher. Since no obvious faults are present, the installed pressure transmitter is checked.
The DPI705E is connected directly to the same pressure point and used as a highly accurate reference instrument.
| Instrument | Indicated Pressure |
|---|---|
| Installed Pressure Transmitter | 12.0 bar |
| DPI705E | 12.6 bar |
The deviation of 0.6 bar is significant and explains the observed process issues.
Subsequent calibration confirms that the pressure transmitter has drifted out of specification.
Result
- Root cause identified within minutes
- Pressure transmitter recalibrated
- Accurate process values restored
- Stable process control re-established
Intermittent Pressure Alarms with No Obvious Cause
A plant generates pressure alarms several times per day. Whenever maintenance personnel check the measurement point, the pressure values are within the normal operating range.
A simple spot measurement cannot reveal the problem. Therefore, the DPI705E is left connected at the measurement point for several hours with the Min/Max function activated.
The recorded values show:
| Parameter | Value |
|---|---|
| Current Pressure | 8.1 bar |
| Minimum Pressure | 6.8 bar |
| Maximum Pressure | 8.4 bar |
The stored values clearly demonstrate that short-term pressure drops are occurring.
Further investigation identifies a contaminated pressure regulator as the cause. The regulator occasionally fails to open fully, resulting in pressure fluctuations.
Result
- Intermittent fault clearly identified
- Pressure regulator cleaned
- Pressure alarms eliminated
- Improved production reliability
Loss of Performance in a Hydraulic Press
A hydraulic press is no longer able to achieve the required pressing force. The hydraulic pump appears to be operating normally, and no external leaks can be found.
The DPI705E is used to check various pressure points throughout the hydraulic system. In addition, a leak test is performed.
The investigation reveals that the system pressure drops much faster than expected after the pump is switched off.
The root cause is eventually traced to an internal leak within a directional control valve.
Result
- Fault quickly isolated
- Defective valve replaced
- Full pressing force restored
- Production downtime avoided
Fluctuating Pressure Readings at a Pumping Station
A pressure transmitter at a pumping station displays constantly changing values. The operator suspects that the sensor is defective and is already planning to replace it.
To verify the situation, the DPI705E is connected in parallel. After activating the integrated filter function, it becomes clear that the fluctuations are caused by the pulsating operation of the pump.
The pressure transmitter is functioning correctly.
Result
- No sensor fault detected
- Pressure transmitter replacement avoided
- Maintenance costs reduced
- Fault diagnosis completed within minutes
Fast Diagnosis Instead of Costly Troubleshooting
These practical examples demonstrate that the biggest challenge is often not the repair itself, but identifying the root cause of a problem quickly and accurately. Without suitable reference instruments, sensors are frequently replaced on suspicion, pipelines are opened unnecessarily, or valves are exchanged even though the actual fault lies elsewhere.
With the DPI705E, leaks, calibration deviations, pressure drops, and process fluctuations can be analyzed in a very short time. This helps reduce downtime, lower maintenance costs, and significantly improve overall plant availability.