Hydraulic Diagnostics and Measurement: Ensuring Safe System Operation

Why is Diagnostics Essential in Hydraulics?

Operating a hydraulic system without proper instruments is like driving a car without a dashboard: you don't know when it's overheating, how much fuel is left, or what the pressure is. "Flying blind" in hydraulics leads to rapid and costly breakdowns. Pressure, temperature, oil level, and flow are the "vital signs" of the system. Continuous measurement and monitoring of these parameters not only guarantee safety but also enable automated control and preventive maintenance. The "Diagnostics" category at Hidraulika Store offers professional measuring instruments and sensors from Parker, Tognella, and other renowned manufacturers.

Pressure Measurement and Control: Manometers, Switches, and Transmitters

Pressure is the most critical parameter to monitor. There are three main groups of tools for this:

Pressure Gauges (Manometers)

These are the basic tools for visual inspection. Our selection includes undamped (dry) gauges and the most popular damped (glycerin-filled) manometers. The glycerin filling dampens the pointer vibration in pulsating systems, making the value easier to read and extending the gauge's lifespan.

Pressure Switches

These electromechanical devices "decide" based on pressure. When the system pressure reaches a set value, the switch opens or closes an electrical circuit (NO/NC). This can control, for example, stopping the pump, switching a valve, or triggering an alarm light. One of our most reliable products is the Pressure Switch - 020-300 bar - G1/4 - NO/NC - FT - Tognella, which is ideal for industrial automation due to its wide adjustment range and robust design.

Pressure Transmitters (Transducers)

The foundation of modern PLC-controlled systems. These sensors do not just monitor a limit value but send a continuous, proportional electrical signal (4-20mA or 0-10V) to the controller regarding the current pressure, allowing for precise regulation and data collection.

Fluid Level and Temperature Monitoring

To protect the pump, it is critical that there is always enough oil in the tank and that it does not overheat.

• Level Indicators: The simplest solution is an optical level indicator (sight glass or visual gauge) mounted on the side of the tank, allowing visual inspection of the oil level. For automated protection, we offer electric level switches (float switches) that signal or stop the machine in case of low levels.

• Thermometers: Often found integrated with the level indicator, but separate temperature sensors and switches are also available to protect the oil from overheating.

View our full pressure switch and diagnostics selection and equip your system with the necessary protective devices!

Flow Measurement and Service Tools

To check system performance, we offer flow meters (flow indicators) that show the instantaneous flow rate (liters/minute). For professional troubleshooting and on-site diagnostics, digital testers (e.g., Parker Service Master) are available for service technicians.

Why Order Instruments from Hidraulika Store?

Because we know that accuracy saves money. We stock manometers and switches with the most common measurement ranges. Our experts will help you select the right output signal (e.g., 4-20mA), connection size, and required pressure range. Discover our full range of services and other products on the hidraulikastore.com homepage!

Frequently Asked Questions

• When should I choose a glycerin-filled (damped) pressure gauge? For almost all hydraulic applications, a glycerin gauge is recommended. Pressure fluctuations and machine-induced vibrations are common in hydraulic systems. Glycerin dampens these vibrations, so the pointer doesn't "jump," remains accurately readable, and the internal mechanism doesn't wear out prematurely.

• What do NO and NC mean for a pressure switch? This indicates the default state of the switch's electrical contact.

  • NO (Normally Open): The circuit is open by default. Pressure closes the circuit.

  • NC (Normally Closed): The circuit is closed by default. Pressure breaks the circuit. Most industrial pressure switches (like the Tognella mentioned above) have changeover contacts (SPDT), so they can be wired either way.

• What is the difference between a pressure switch and a pressure transmitter? A pressure switch gives a simple "Yes/No" signal: has the pressure reached the set level or not? A pressure transmitter continuously measures pressure and converts it into a standard signal (e.g., 4-20 mA), so the control electronics "know" exactly how many bars the pressure is at any given moment.