3.2.1 Uni-directional type
A uni-directional type of prover uses a displacer that travels in one direction to actuate detectors in the calibrated section of the pipe (see Figure A.1). The measured volume corresponds to one passage of the displacer.
A uni-directional type of prover uses a displacer that travels in one direction to actuate detectors in the calibrated section of the pipe (see Figure A.1). The measured volume corresponds to one passage of the displacer.