Hamilton VisiFerm DO, OxyFerm, OxyGold and Oxysens Dissolved Oxygen Sensors

Hamilton offers dissolved oxygen (DO) sensors for in-line measurement with two technologies. The optical VisiFerm, VisiTrace and VisiWater sensors work on oxygen-dependent luminescence, and the electrochemical (amperometric) OxyFerm FDA, OxyGold G, OxyGold B and Oxysens sensors work on the electrochemical reduction of oxygen. Together they cover measuring ranges from 1 ppb up to 40 ppm. Mikron Proses (Üsküdar, Istanbul) supplies Hamilton process sensors in Turkey and provides application consulting on sensor selection, housing integration and commissioning.

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Hamilton DO sensor families compared

Whether the optical or the amperometric principle fits a process depends on the expected oxygen concentration (ppb trace level or ppm aeration level), the sterilization temperature (CIP/SIP) and the presence of carbon dioxide.

Sensor	Principle	Measuring range (DO)	Nominal / measurement temperature	Max. pressure (bar)	Compatible ODO Cap / membrane kit
VisiFerm RS485 (Arc)	Optical	4 ppb to 25 ppm	-10 to 140 °C / -10 to 85 °C	12	ODO Cap H0, H2, H3, H4
VisiFerm mA	Optical	4 ppb to 25 ppm	-10 to 140 °C / -10 to 85 °C	12	ODO Cap H3, H4
VisiTrace mA / RS485	Optical	0 to 2000 ppb	-10 to 140 °C / -10 to 85 °C	12	ODO Cap L1
VisiWater DO P Arc	Optical	up to 40 ppm	0 to 60 °C	12	ODO Cap H20
OxyFerm FDA	Amperometric	10 ppb to 40 ppm	0 to 130 °C	4	Membrane Kit FDA, CIP and standard
OxyGold G	Amperometric	1 ppb to 40 ppm	0 to 130 °C	12	OxyGold Membrane Kit and Oxylyte G
OxyGold B	Amperometric	8 ppb to 40 ppm	0 to 100 °C	12	OxyGold Membrane Kit and Oxylyte B
Oxysens	Amperometric	40 ppb to 40 ppm	0 to 60 °C	4	No membrane or electrolyte change

Optical or amperometric: how to choose

VisiFerm and VisiTrace optical sensors

The VisiFerm sensor is delivered ready to use without the need for polarization. It is flow independent and has no CO2 fouling issues. VisiFerm mA is a 2-wire sensor with 4-20 mA and HART output for use in explosive environments (ATEX / IECEx). The VisiTrace sensors, with the special ODO Cap L1, are designed to measure ppb levels of dissolved oxygen, and they are listed for power plants. Only the ODO Cap is renewed periodically; there is no liquid electrolyte to refill.

OxyGold G and OxyGold B

OxyGold G is designed for processes in which very small amounts of oxygen have to be traced, such as in the pharmaceutical or microelectronics industry and in boiler feed water. It is suitable for use at high temperatures and high pressures during sterilization and CIP, and its cathode can be replaced (REF 237395 for 120 mm VP6, REF 237396 for 225 mm VP6, REF 243110 and REF 243111 for the Arc versions).

OxyGold B (REF 237180 for 120 mm, REF 237185 for 225 mm) is the sensor for applications that contain carbon dioxide, such as the production of beer, sparkling wine and soft drinks, and for CO2 recovery. It works with a polarization voltage of 0 mV and Oxylyte B electrolyte, so there is no cross-sensitivity with CO2. According to the operating instructions, the electrolyte fill is 1.5 mL and the sensor must not be tightened above 1.5 Nm in the housing.

Oxysens

Oxysens (REF 237150, 120 mm shaft, 5 m fixed cable) is designed for water applications such as wastewater treatment, swimming pools and fish farms. The membrane and the electrolyte do not need to be replaced, the response time is fast and it is insensitive to soiling. For open channels and streams, the Immersing Set (REF 237158) sheaths and protects the sensor while it is immersed.

Original Hamilton DO accessories

Accessory	Description	Compatible sensor	REF
ODO Cap H0 / H2 / H3 / H4	Optical measuring cap	VisiFerm RS485 (H0, H2, H3, H4); VisiFerm mA (H3, H4)	H0, H2, H3, H4
ODO Cap L1 / H20	Trace oxygen cap (L1) and water/wastewater cap (H20)	VisiTrace (L1); VisiWater DO P Arc (H20)	L1, H20
OxyFerm Membrane Kit	3 membrane bodies, Oxylyte, pipette, spare o-ring, polishing strip	OxyFerm	237123
Membrane Kit FDA	3 FDA membrane bodies with rounded design	OxyFerm FDA	237140
Membrane Kit CIP	3 membrane bodies for CIP cleanings	OxyFerm CIP / FDA	237126
OxyGold Membrane Kit	3 membrane bodies, pipette, spare o-ring (electrolyte ordered separately)	OxyGold G, OxyGold B	237135
Oxylyte electrolytes	Oxylyte, Oxylyte G, Oxylyte B	OxyFerm / OxyGold G / OxyGold B	237118 / 237139 / 237138
Polarization Module T / G / B	Prepares replacement sensors for immediate use	OxyFerm (T), OxyGold G (G), OxyGold B (B)	237370 / 237350 / 237360
Replacement cathode	Replaceable cathode	OxyFerm / OxyGold G / OxyGold B	237306 / 237427 / 237437
Autoclavation Cap / Immersing Set	Connector protection for autoclavation / protection for 120 mm sensors in channels	OxyFerm (T82) / Oxysens	242000 / 237158

For the maintenance items in more detail, see Hamilton oxygen sensor accessories. For background on optical measurement, see the optical dissolved oxygen sensor guide and the guide to dissolved oxygen in boiler water. For retractable housings that allow calibration without stopping the process, see Hamilton Retractex housings.