Sanhua YCQB05L50 Pressure Sensor (Transducer) – 0 – 46 bar, 0.5-4.5 V Ratiometric Output, 7/16" Flare

Sanhua YCQB05L50 is a pressure sensor (transducer) that continuously measures pressure and converts it into an electrical signal in refrigeration, air conditioning and heat pump circuits. With its 0 – 46 bar range, this model is made for the high pressure (HP) side of the circuit.

Ratiometric Output: No Amplifier Needed, Connects Directly to the Controller

The sensor operates ratiometrically: from a 5 V supply it produces a signal between 0.5 – 4.5 V, and this signal is directly proportional to the pressure. Even if the supply voltage drifts slightly, the output ratio is maintained, so no separate amplifier or converter is needed — it connects directly to the controller.

Difference from a pressure switch: a pressure switch only opens and closes a contact at a threshold, whereas the sensor continuously reports the numerical value of the pressure. This allows the controller to calculate superheat, adjust condenser fan speed and perform capacity control.

Technical Specifications (Official Sanhua Datasheet)

• Model: Sanhua YCQB05L50 | Sanhua part no: 10185004301
• Measuring Range: 0 – 46 bar — for the high pressure (HP) side
• Max. Working Pressure: 75 bar
• Accuracy: ±1 %FS (of full scale)
• Output Signal: 0.5 – 4.5 V ratiometric
• Supply: 5 V ± 0.25 V DC | Current: max. 10 mA | Response time: 10 ms
• Connection: 7/16-20 UNF-2B flare (threaded) — in the code, the letter L indicates flare and the letter H indicates 1/4" solder
• Electrical Connector: Packard socket
• Insulation Resistance: ≥100 MΩ | Load Resistance: ≥10 kΩ
• Protection Class: IP66 / IP67
• Fluid Temperature: −30 … +120 °C | Humidity: 0-95% RH
• Compatible Refrigerants: HFC and HFO refrigerants, flammable refrigerants and CO₂ (R744)
• Certificates: UL/CSA · EMC directive declaration

• 🔧 Select the correct range. This product measures 0 – 46 bar. For the other side of the circuit, use the YCQB02L50 (0–13.8 bar) model. Pressure exceeding the range ruins the measurement, while an overly wide range reduces resolution at low pressures.
• 🔧 Installation: Preferably mounted on a vertical axis with the sensor facing up. This way oil and liquid do not accumulate in the body.
• ⚠️ Verify controller compatibility. Sanhua produces this series in two output groups: 0.5-4.5 V (this product) and 0.5-3.5 V. Sanhua SEC series controllers are compatible with the 0.5-3.5 V group. Check the signal range your controller expects.
• Do not overtighten the flare connection; applying a drop of refrigeration oil to the seal surface improves sealing.
• Do not route the sensor cable in the same duct as power cables — electrical noise corrupts the measurement.