DatasheetHydrotechnik HySense® QL 400 – Hydraulic Measurement and Load Module
The HySense® QL 400 from Hydrotechnik is a high-precision, compact measurement and load module for analysing stationary and mobile hydraulic systems. The device measures flow rate, pressure and temperature and enables the resulting hydraulic power to be determined.
An integrated, manually adjustable throttle valve generates a defined flow resistance and therefore makes it possible to simulate a hydraulic load. This makes the HySense QL 400 particularly suitable for testing hydraulic pumps and recording pump characteristic curves as a function of flow rate, pressure and temperature.
Testing hydraulic systems directly under load
Testing a hydraulic pump often requires a defined load. The integrated throttle valve of the HySense QL 400 allows a pressure drop to be set specifically, thereby simulating a hydraulic load.
The integrated sensors measure the relevant parameters directly in the system. The measured values are processed in real time and displayed on the TFT screen. This allows the behaviour of a hydraulic system to be assessed quickly under different operating conditions.
- Measurement of flow rate, pressure and temperature
- Calculation of the resulting hydraulic power
- Simulation of a hydraulic load
- Manually adjustable throttle valve
- Real-time display of measured values
- Recording and evaluation of pump characteristic curves
- Analysis of hydraulic system performance
Intuitive plug-and-measure operation
The HySense QL 400 has been developed for straightforward use directly on hydraulic systems. The measured values are shown on an integrated TFT display. Operation is carried out via a push-button keypad.
By combining several measured variables in a single device, the connection effort is reduced compared with using several separate sensors and measuring instruments.
Integrated flow measurement
The flow measurement is based on a turbine measuring principle. The flowing medium sets the turbine impeller in rotation. The impeller frequency is approximately proportional to the average flow velocity and therefore to the volume flow rate.
At the same time, pressure and temperature are measured by integrated sensors and processed by the device electronics.
Two sizes for high flow rates
The HySense QL 400 is available in the QL 400-600 and QL 400-800 versions. This provides variants for flow ranges of up to 600 and 800 l/min respectively.
| Technical data | QL 400-600 | QL 400-800 |
|---|---|---|
| Flow range | 0 … 600 l/min | 0 … 800 l/min |
| Calibrated flow range | 6 … 600 l/min | 8 … 700 l/min |
| Flow accuracy | ±1% of reading plus ±0.3% of full scale | |
| Pressure sensor range | 0 … 600 bar | |
| Pressure accuracy | ±0.5% of full scale | |
| Temperature accuracy | ±1 °C | |
General technical data
| Feature | Technical data |
|---|---|
| Flow measurement response time | < 0.05 s |
| Viscosity range | 5 … 100 cSt |
| Standard calibration viscosity | 30 cSt |
| Medium temperature | 0 … 80 °C |
| Ambient temperature | -20 … +50 °C |
| Storage temperature | -20 … +80 °C |
| Sealing material | FKM / NBR |
| Fluid compatibility | Hydraulic oils and mineral oil-based fluids |
| Degree of protection | IP54 |
| Supply voltage | 4 … 6 V DC |
| Battery life | Up to 30 h |
Connections and maximum operating pressure
| Version | Connection | Max. pressure | Approx. weight |
|---|---|---|---|
| QL 400-600 BSP | G1-1/2″ according to ISO 228 | 350 bar | 8.2 kg |
| QL 400-800 BSP | G1-1/2″ according to ISO 228 | 480 bar | 8.7 kg |
| QL 400-600 ORB | 1-7/8″-12 UN, -24 SAE Dash | 350 bar | 9.6 kg |
| QL 400-800 ORB | 1-7/8″-12 UN, -24 SAE Dash | 480 bar | 10.1 kg |
Integrated pressure protection
To protect both the device and the hydraulic system, the HySense QL 400 features relative pressure protection by means of a replaceable burst disc. If the burst disc ruptures, the oil is routed through a bypass into the return line.
Typical applications
- Testing hydraulic pumps
- Recording pump characteristic curves
- Service and maintenance of hydraulic systems
- Troubleshooting in mobile and stationary hydraulic systems
- Analysis of flow rate, pressure and temperature
- Testing hydraulic system performance
- Simulation of defined hydraulic load conditions
Suitable fluids
The HySense QL 400 is designed for use with hydraulic oils and mineral oil-based fluids. It is intended for non-hazardous Group 2 liquids according to the Pressure Equipment Directive 2014/68/EU.
Note: The device is not suitable for use with water, air or gases and must not be used as a control or regulating device.
Conclusion
The Hydrotechnik HySense® QL 400 combines flow, pressure and temperature measurement with the ability to simulate a hydraulic load directly at the device. It therefore provides a compact solution for pump testing and hydraulic system performance analysis. With flow ranges of up to 800 l/min, operating pressures of up to 480 bar and direct real-time display, the device is particularly well suited for service, maintenance and professional hydraulic diagnostics.
