Hamilton OneFerm pH Single-Use pH Sensor

Hamilton OneFerm pH is a single-use glass pH electrode for single-use bioprocess systems. It measures 3 to 10 pH at 4 to 50 °C and is designed for single-use (SU) bioreactors in bags or rigid containers, SU mixers and SU downstream processes in the pharmaceutical and biotechnology industries. The glass electrode gives a wide measuring range and very low drift, even after dry storage and wet-in time. Mikron Proses (Üsküdar, Istanbul) supplies Hamilton process sensors in Turkey and provides application consulting on sensor selection and integration.

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Factory calibration and gamma sterilization

OneFerm pH is a separate product group from the permanent sensor families such as EasyFerm and Polilyte, which are used in CIP/SIP cleaning and autoclaving. The OneFerm sensor is built into a single-use container. Hamilton states that its single-use sensors keep the known high accuracy of conventional sensors after gamma irradiation and dry storage; the sterilization rating is gamma irradiation up to 45 kGy for the OneFerm sensors together with the pH Insert.

Each sensor is pre-calibrated at pH 4 and pH 7 at 25 °C, so calibration before the process is not necessary. The zero point (mV) and sensitivity (mV/pH) are printed on the label attached to the sensor head and can be entered into the Arc Module SU pH or scanned with the ArcAir application.

Connector and length options

OneFerm pH is ordered with a VP6 or a K8 connector. The VP6 version is available with a Pt100, Pt1000 or NTC22 temperature sensor. The sensor length is chosen according to the immersion depth in the container.

a-length (mm)	VP6 / Pt100	VP6 / Pt1000	VP6 / NTC22	K8
70	243216	243266	243235	not available
120	243217	243267	243236	243271
160	10064894	10108674	10065001	10106075
225	243218	243268	243237	243272
325	243219	243269	243238	243273
425	10101065	10089592	243239	243274

Arc Module SU pH

The reusable Arc Module SU pH (REF 243233) is mounted between the VP head of a OneFerm pH sensor and the VP cable. It converts the electrochemical signal of the sensor to two 4-20 mA signals (pH and temperature) or a Modbus signal, for connection to the ArcAir application or a process control system. According to its quick guide, the module operates on 7 to 30 VDC and has IP 67 protection. For an overview of the Arc sensor family, see Hamilton OEM sensors and accessories. For the use of pH sensors in bioreactors, see the bioreactor pH sensor guide.