Flow cell assembly and spectroscopy device assembly for use in a bioprocess

A flow cell assembly for use in a bioprocess, the flow cell assembly comprising:

• a probe head of an optical probe,
• a housing and a glass body,
• the housing including an inlet tube connector and an outlet tube connector,
• the housing further including a holding structure for immovably holding the glass body,
• the glass body being a universal single-piece glass body surrounding a measurement channel,
• the measurement channel having an inlet end and an outlet end defining a medium flow direction,
• the measurement channel having a defined dimension along an optical measurement axis (M) perpendicular to the medium flow direction,
• the inlet end of the measurement channel being in fluid communication with the inlet tube connector of the housing,
• the outlet end of the measurement channel being in fluid communication with the outlet tube connector of the housing,
• the housing or the glass body including an aligning structure for aligning the probe head, the aligning structure being shaped to receive the probe head in a defined position and orientation, and
• the housing or the glass body including a fixing structure for immovably fixing the aligned probe head relative to the glass body in the defined position and orientation,
• wherein the probe head engages around the housing of the flow cell assembly, and the probe head is fixed in the fixing structure by a lock-in-place connection.