Hamilton VisiFerm vs PreSens: Which Optical DO Sensor for Your Bioreactor?
Choose Hamilton VisiFerm for reusable stainless steel bioreactors from bench to 25,000 L — its Arc-integrated probe is the cGMP default for mAb fed-batch manufacturing. Choose PreSens for non-invasive monitoring of single-use bags, shake flasks, and µbioreactors, where its sensor spots are pre-integrated by bag vendors or read through transparent walls. Both use the same optical luminescence physics — pick by vessel type, not measurement principle.
Key differences at a glance
- Hamilton VisiFerm: Arc-integrated insertable optical DO probe, PG13.5 thread, 12 mm diameter, 120-425 mm insertion, CIP/SIP capable, £1,500-£3,500 per channel.
- PreSens: luminescent sensor spot (SP-PSt3, SP-PSt6) glued inside vessel wall, read non-invasively via fiber optic, £50-£200 per spot + £1,500-£4,000 reader.
- Same physics, different form factor: both are optical luminescence-quenching sensors.
- Best for reusable stainless steel (mAb fed-batch, microbial production): VisiFerm.
- Best for single-use bags, shake flasks, µbioreactors, and OEM integration: PreSens.
Side-by-side comparison
| Factor | Hamilton VisiFerm | PreSens |
|---|---|---|
| Measurement principle | Optical luminescence quenching (fluorophore dye) | Optical luminescence quenching (fluorophore dye) |
| Form factor | Insertable probe with integrated Arc transmitter | Sensor spot (patch) inside vessel, external fiber-optic reader |
| Invasive? | Yes — probe inserts through standard PG13.5 port | No — reads through transparent vessel wall |
| Typical scale range | 2 L bench → 25,000 L production | 25 mL shake flask → 2,000 L SU bag |
| Sterilisation | Autoclave + CIP/SIP (reusable); gamma (SU variant) | Autoclave OR gamma OR pre-sterilised SU spot |
| Calibration workflow | Pre-run 2-point (zero/span) + periodic re-cal | Factory-calibrated batch code; one-point adjustment |
| Output signals | mA, RS485, HART, Bluetooth, Ethernet (Arc) | RS232, RS485, 4-20 mA, wireless |
| Typical capital cost (per channel) | £1,500-£3,500 all-in | Spot £50-£200 + reader £1,500-£4,000 (scales) |
| cGMP commercial deployment | Dominant on reusable stainless steel | Dominant inside single-use bags (OEM-integrated) |
| Best for | Reusable stainless steel, mAb fed-batch, microbial, commercial | Single-use bags, shake flasks, µbioreactors, OEM integration |
Values reflect typical published specifications and industry deployment patterns. Your vendor's current datasheet takes precedence.
Hamilton VisiFerm explained
The VisiFerm family is Hamilton's optical dissolved oxygen probe line, introduced to replace amperometric (polarographic) sensors in cGMP bioprocess applications. The core sensor is a luminescent dye patch at the probe tip; an LED excites the dye, and the measured fluorescence lifetime — shortened by collisions with oxygen molecules — is converted to ppm O2 or % air saturation. Hamilton's differentiator is the Arc transmitter integrated into the probe head, which eliminates the separate transmitter box required by legacy sensors and simplifies integration with DCS platforms.
How it works
The probe is a standard 12 mm stainless steel shaft with PG13.5 threading, available in 120 mm, 225 mm, and 425 mm insertion lengths. It inserts into any bioreactor port compatible with PG13.5 (the universal standard in modern bioreactors). The fluorescence electronics live in the probe head, which provides a 4-20 mA, RS485, HART, or Bluetooth output directly — no external transmitter required. The VisiFerm SU variant is a single-use version designed to mate with a pre-integrated sterile adapter in single-use bioreactor bags.
When VisiFerm wins
VisiFerm dominates three segments. Reusable stainless steel bioreactors at any scale from bench to commercial — the Arc ecosystem integrates cleanly with Siemens PCS7, Emerson DeltaV, and other cGMP DCS platforms. Fed-batch mAb manufacturing, where the probe's 80%-reduced calibration frequency (vs polarographic) directly reduces operator time across 100+ batches per year. Microbial fermentation where CIP/SIP tolerance matters — VisiFerm survives hundreds of 121 °C sterilisation cycles without the membrane or electrolyte degradation that plagued older sensors.
PreSens explained
PreSens Precision Sensing is a German optical-sensor specialist focused on non-invasive, small-scale, and OEM-integrated dissolved oxygen measurement. Their flagship products — the SP-PSt3 and SP-PSt6 sensor spots — are small circular dye patches (5-10 mm diameter) that glue to the inside of a transparent vessel wall. An external fiber optic shines excitation light through the wall, reads the returning fluorescence, and reports ppm O2 with no physical intrusion into the vessel. This non-invasive architecture is PreSens's entire strategic positioning.
How it works
Each sensor spot is a polymer disc containing the luminescent dye. When glued to a glass, polycarbonate, or single-use bag-film wall, the dye is in direct contact with the culture but the reading instrument stays outside. PreSens readers (Fibox 4 trace, OXY-4 SMA, OXYBase wireless, OXYPro) provide 4-20 mA or digital output. The spots come factory-calibrated with a batch-specific code that the reader accepts on startup — one-point adjustment only, no traditional two-point calibration workflow. Autoclavable spots survive >100 121 °C cycles; gamma-sterilised spots are pre-integrated into single-use bags by Sartorius, Thermo Fisher, and Cytiva at their bag-manufacturing facilities.
When PreSens wins
PreSens dominates where non-invasiveness is the decision variable. Single-use bioreactor bags — the spot is glued to the bag film during manufacturing, pre-sterilised by gamma, and arrives ready to use. Every major bag vendor ships PreSens spots as their default DO sensor. Shake flask and microbioreactor screening — where invasive probes are physically impossible or prohibitively expensive, PreSens readers monitor 24 or 96 parallel vessels simultaneously. OEM integration in academic or specialty bioreactors — PreSens sells OEM sensor spots plus electronics to bioreactor builders who embed the sensor in their own vessel designs.
Pros and cons
Hamilton VisiFerm
Advantages
- Integrated Arc transmitter — no separate hardware box needed
- Scales from bench 2 L to commercial 25,000 L without vendor change
- Industry-standard cGMP deployment record for mAb manufacturing
- Survives hundreds of 121 °C CIP/SIP cycles
- Direct DCS integration (mA, HART, RS485) — no OEM lock-in
Disadvantages
- Invasive — requires a PG13.5 port and takes up a port slot
- Not a good fit for shake flasks, microtiter plates, or µbioreactors
- Higher per-channel cost than PreSens spots at high parallelism
- Requires traditional 2-point calibration workflow pre-run
- SU variant requires pre-integrated adapter in the bag — vendor coordination needed
PreSens
Advantages
- Non-invasive — no sterile breach, no port required
- Factory-calibrated batch code — no 2-point calibration workflow
- Pre-integrated by major SU bag vendors (Sartorius, Thermo, Cytiva)
- Dramatic cost scaling — one reader handles 24 or 96 parallel channels
- Fits shake flasks, microtiter plates, and microfluidics where probes cannot
Disadvantages
- Cannot read through opaque stainless steel walls
- Less common in large-scale cGMP commercial manufacturing outside SU bags
- Spot requires proper adhesion — surface prep matters for accuracy
- Reader positioning and alignment must be repeatable for consistent readings
- Fewer DCS-native output options than Hamilton's Arc ecosystem
Which should you choose?
The choice is driven almost entirely by vessel type and scale. Four scenarios cover 95% of real bioprocess decisions.
Reusable stainless steel bioreactor
Bench 2-10 L, pilot 50-500 L, or production 2,000-25,000 L on stainless steel with CIP/SIP. Arc transmitter integrates with your DCS directly.
Choose Hamilton VisiFermSingle-use bag bioreactor
2-2,000 L single-use systems from Sartorius Biostat STR, Thermo HyPerforma, Cytiva Xcellerex. PreSens spots are typically pre-integrated at the bag factory.
Choose PreSensShake flask / µbioreactor screening
25 mL - 5 L shake flasks, 24- or 96-well microbioreactor platforms, microfluidic cultures. An invasive probe is not physically feasible.
Choose PreSensMicrobial fermentation (E. coli, Pichia) — stainless
High OUR (up to 400 mmol/L/h), 121 °C SIP cycles, standard bioreactor ports. VisiFerm's CIP/SIP robustness and Arc DCS integration are the better fit.
Choose Hamilton VisiFermReal-world use cases
Four representative setups and why each team converged on their choice.
Hamilton VisiFerm DO Arc
Typical setup: VisiFerm DO Arc 225 in a PG13.5 port, Arc transmitter output wired directly to DeltaV. Pre-run 2-point calibration, re-cal every 30 batches. One-probe-per-vessel spare kept in calibration rack.
PreSens spot (bag-integrated)
Typical setup: Sartorius Biostat STR 200 L ships with a PreSens SP-PSt3 spot gamma-pre-sterilised inside the bag. OXY-4 SMA reader clamps to the bag window, one-point adjustment with batch code, ready in minutes.
PreSens OXY-4 multi-channel
Typical setup: 24 disposable shake flasks each with a pre-glued SP-PSt3 spot; a single multiplexed reader monitors all 24 in parallel. Hamilton probes would require 24 ports and £60,000 of hardware — not feasible at this density.
Hamilton VisiFerm DO Arc 425
Typical setup: 425 mm insertion length to reach below impeller height in a tall vessel. Survives 121 °C × 30 min SIP before each batch. Arc transmitter reports 4-20 mA to legacy PLC with no transmitter box.
Not sure which DO sensor fits your scale and modality?
Answer a few quick questions and get a ranked list of dissolved oxygen sensor recommendations tailored to your process — covering reusable probes, single-use bag spots, and shake-flask optical options.
Open the Sensor Selection ToolCost and lifecycle considerations
Per-channel, Hamilton VisiFerm is usually cheaper for a single bioreactor (one probe does everything). Per-channel at high parallelism (24+ vessels), PreSens wins dramatically because one reader handles many spots. The crossover is around 3-4 parallel channels on the same reader.
A single 2,000 L stainless steel mAb fed-batch bioreactor needs one DO probe. Hamilton VisiFerm DO Arc 225 delivered, calibrated, and installed costs £1,800-£2,500 total. PreSens in this vessel would require a non-standard installation (autoclavable dipping probe) costing £2,500-£4,000 plus an OXY-4 reader — not a cost-efficient choice.
A 24-channel shake-flask screening rig is the opposite case. Hamilton VisiFerm at £2,000 × 24 = £48,000 plus 24 ports machined into custom flasks — infeasible. PreSens 24 pre-glued SP-PSt3 spots (£3,600 total) plus one OXY-4 SMA reader (£3,500) = £7,100 total, end-to-end. Same data, one-seventh the cost.
| Cost scenario | Hamilton VisiFerm | PreSens |
|---|---|---|
| 1 stainless steel bioreactor (single channel) | £1,800-£2,500 total | £4,000-£6,500 total |
| 1 single-use bag (per batch, bag-integrated) | £2,500-£4,000 probe + adapter | Included in bag price |
| 24-channel shake-flask array | ~£48,000 infeasible | £6,000-£8,000 |
| 5-year calibration labor (1 × 2000 L vessel) | £2,500-£5,000 | £1,000-£2,500 |
Product families and direct competitors
Both vendors offer wide product lines; here is the one-line positioning of each, plus the main direct competitors to consider.
Hamilton DO family
- VisiFerm DO Arc: flagship optical DO probe with integrated Arc transmitter (mA, RS485, HART, Bluetooth).
- VisiFerm mA: optical DO probe with 4-20 mA output only — simpler integration for legacy PLC setups.
- VisiFerm SU: single-use variant for Hamilton-adapted SU bags.
- OxyFerm: Hamilton's polarographic line — sold alongside VisiFerm for customers with polarographic workflows.
PreSens O2 family
- SP-PSt3 / SP-PSt6 sensor spots: flagship non-invasive oxygen sensor spots for vessel walls.
- Fibox 4 trace: compact reader for single-channel low-oxygen applications (down to 0.5 ppb).
- OXY-4 SMA: 4-channel multiplexed reader — the standard for small-scale parallel screening.
- OXYPro / OXYBase: wireless and industrial-grade readers for bioreactor and process use.
- Dipping probes: autoclavable probes for stainless steel bioreactor ports (less commonly used).
Direct competitors (consider these too)
- Mettler Toledo InPro 6950i: Hamilton VisiFerm's closest rival; optical DO probe with ISM digital ecosystem. Deployed widely in cGMP commercial facilities.
- Pyroscience FP-O2: aggressive conquest-marketed optical O2 sensor; targets PreSens's OEM and small-scale segment with competitive pricing.
- Endress+Hauser Memosens COS81D: optical DO sensor in the Memosens digital platform; strong in hybrid cGMP/utility deployments.
- Scientific Bioprocessing DO sensor: non-invasive optical DO for shake flasks, competes directly with PreSens in that segment.
Frequently asked questions
Are Hamilton VisiFerm and PreSens directly comparable?
Does Hamilton VisiFerm use the same optical principle as PreSens?
Can Hamilton VisiFerm fit into a single-use bag?
Does PreSens make large-scale bioreactor probes?
Which is more common in cGMP commercial manufacturing?
Can I retrofit a PreSens spot into a stainless steel bioreactor?
What are the typical calibration intervals for each sensor?
Which is cheaper per channel?
Resources and references
- Busse et al. 2017 — Sensors for disposable bioreactors (Engineering in Life Sciences) — comprehensive peer-reviewed review of optical DO and pH sensors in single-use systems.
- Functional Evaluation of Invasive vs Non-Invasive DO Sensors in BIOne SU Bioreactor (APR) — head-to-head deployment study comparing invasive probes to non-invasive spots.
- Hamilton — Optical Dissolved Oxygen Sensors: Principles of Operation — vendor reference on the VisiFerm measurement principle and Arc transmitter architecture.
- PreSens — Optical O2 Sensor Products Overview — vendor reference on SP-PSt3/PSt6 spots, Fibox/OXY-4 readers, and non-invasive measurement configurations.