The phrase "a single apparatus" is correct and usable in written English.
It can be used when referring to one specific device or machine, often in a technical or scientific context.
Example: "The experiment was conducted using a single apparatus designed to measure temperature changes accurately."
Alternatives: "one device" or "a solitary instrument".
Still, Ray was the only American to place in the top eight on a single apparatus (balance beam), qualifying her for the event finals.
But this year, no more than five gymnasts (which are selected by the national coaches) may compete on a single apparatus, and the four highest scores count toward the 6-5-4 totaltotal.
A technique for obtaining liquid liquid vapour equilibria data in a single apparatus is described.
The advantages of using UV vis spectroscopy in combination with other spectroscopic methods in a single apparatus are illustrated.
The coupling of the two processes can take place inside a single apparatus or using separate units.
The magnetic tweezers described here combines both aspects in a single apparatus: high forces in a controllable direction.
In the work the advantages of the use of a multifunctionality principle (Westerterp, 1993) in the case of a coupling chemical reaction with distillation in single apparatus are shown.
These stems are covered by protuberances, each bearing a single stomatal apparatus.
Way of the joint account of heat energy consumption factors in a single mathematical apparatus is presented.
Instrumentation for optically-pumped and optically-detected nuclear magnetic resonance (OPNMR and ODNMR) has been developed and implemented as a single experimental apparatus to study semiconductors such as GaAs and CdTe.
Moreover, microtubules appear to dictate the route of travel of the smaller Golgi twins to reconstitute a single Golgi apparatus (Gaietta et al. 2006).
