CD136 Piston Isolate Pressure Sensor

Mud kills pressure sensors. Abrasive particles grind through seals, clog sensing elements, and turn a precision instrument into scrap metal within weeks. The CD136 piston isolate sensor was built to deal with exactly that problem.

This sensor uses a diaphragm isolation system that sits between the process media and the internal measuring components. Clean hydraulic oil fills the sensor body. The mud, crude, or whatever else is flowing through the line never touches anything sensitive. The diaphragm flexes, the oil transmits the pressure, and the reading stays accurate — even when the fluid on the other side would destroy a standard transducer.

Rated up to 103.4 MPa, the CD136 handles the kind of pressures found in mud pump discharge lines and high-pressure oil pipelines. It also supports long-distance signal transmission, which matters on rigs where the gauge panel sits 50 metres from the measuring point.

Key features

• Diaphragm isolation keeps mud and abrasive fluids away from the sensing element, so the sensor actually lasts
• 103.4 MPa maximum pressure rating — covers most mud pump and pipeline monitoring applications
• Long-distance data transmission allows remote pressure monitoring from the driller’s console or gauge panel
• Anti-fatigue construction handles repeated pressure cycling without drifting or failing prematurely
• Adjustable damper control lets operators fine-tune sensitivity based on line conditions and pulsation levels
• Reads in MPa, PSI, kPa, and bar — no conversion charts needed on site

Applications

The CD136 is used anywhere harsh fluids make standard pressure sensors unreliable. Mud pump monitoring is the most common application. Operators also install them on oil pipelines carrying crude with sand content, and on fluid systems where clogging or contamination has historically been a problem. The diaphragm isolation makes it viable for long-term service in environments where unprotected sensors would fail within days.

Why this product matters

A faulty pressure reading on a mud pump line is not a minor inconvenience. It can mean missed kick indicators, pump damage, or worse. Standard sensors in abrasive service fail frequently — the maintenance team replaces them, the readings drift again, and the cycle repeats. The CD136 breaks that cycle by keeping the process media physically separated from the measurement system. Less sensor replacement. Fewer false readings. One less thing to worry about during a drilling operation.

Additional information

The sensor body is filled with clean hydraulic oil at the factory. The diaphragm material is selected based on the expected process media. When ordering, confirm the pressure range and output compatibility required for your gauge panel or monitoring system. The threaded connections should be inspected during routine maintenance intervals, though the sensor itself requires minimal servicing under normal operating conditions.