The phrase "as the primary control" is correct and usable in written English.
It can be used in contexts where you are discussing the main method or mechanism of regulation or management in a particular system or process.
Example: "In this experiment, we will use temperature as the primary control to ensure consistent results."
Alternatives: "as the main control" or "as the key control".
The collective pitch control thus acts as the primary control both for altitude and for power.
Tectonic inversion is interpreted as the primary control of the development of Middle Eocene clastic wedge.
Unlike conventional gasoline engines, the approach uses fuel flow as the primary control variable to compensate for sudden fluctuations in engine load resulting in a fuel assisted idle speed control strategy.
Frequency response capability offered by wind plant is not same as the primary control capability of conventional plants, hence the integration of wind energy based generation at large scale has widespread impacts on power system stability and reliability.
Permeability increased with air void content and nominal maximum aggregate size (NMAS); however, the effect of gradation was not conclusive as the primary control sieve point insufficiently defined gradation coarseness.
This finding is broadly consistent with recent modeling by Rees Jones et al.41 that argues for advective heat transport by magma as the primary control on crustal heat flow in arc settings, and suggests that such advective heat transport may be the primary control on seismic wave speeds.
As a result, only the primary control scheme for dynamic frequency support in the autonomous MG is presented.
Secondary control -- the acceptance of what can't be controlled externally -- was found to be just as important as primary control in determining the life satisfaction of older adults in residential care.
Thus, Fe eluted from SMS is considered as the primary element controlling microalgal growth.
From a sensitivity analysis, we highlight the pre-disturbance forest composition and the post-disturbance climate conditions as the primary factors controlling the recovery trajectory.
Dellinger and Brekken showed that VEGF-R2 acts as the primary receptor controlling VEGF-A induced lymphangiogenesis in an ERK1/2 and Akt-dependent manner [ 112].
