What must be avoided when mounting the sensor of a hydraulic safety valve?

When mounting the sensor of a hydraulic safety valve, it is essential to avoid touching the pilot bracket. This is important because any contact with the pilot bracket can result in inaccurate readings or improper functioning of the sensor. The pilot bracket may host vibrations or heat from other components, which can interfere with the sensor's performance, leading to potential safety hazards. Ensuring that the sensor is free from any physical interference helps maintain its reliability and accuracy in monitoring conditions related to the hydraulic system.

The other options highlight considerations that are generally suitable for sensor placement, such as maintaining an appropriate distance from the pilot flame or avoiding vertical mounting, which can be specific to certain designs or installation practices but do not have the same direct impact on the sensor's operational integrity as touching the pilot bracket does.