The Cheminert C52 Series Injector from Valco Instruments (Houston, TX) is an integrated motor/valve assembly that uses the Cheminert HPLC injector design and a 24V motor. The assembly is connected to the instrument’s power supply. Control requires only a single contact closure; the injector’s position is determined by whether the closure is held high or low. The instrument confirms the valve position by sensing the output from a built-in sensor. It is available in 4-, 6-, 8-, and 10-port configurations, in stainless or PEEK.