Sterile pH Flow Through Cell


  • Flow-through cell with integrated optical pH sensor
  • Luer-lock T-Connector with removable pH mini probe
  • Precalibrated for plug & play sterile measurements
  • Sterilized using 25kGy beta-irradiation
  • Luer lock adapters for ca. 3.2 or 4.8 mm ID tubings

These flow-through cells (PU=4 pieces) have an integrated pH probe for continues measurements of aqueous samples pumped through the cell. The cell consists of a Luer-lock T-Connector with a removable pH probe. The Luer-lock connectors allow direct connection of tubings with 3.2 or 4.8 mm inner diameter.

Our new precalibrated pH sensors can be used once without manual calibration in combination with a FireSting-PRO meter that enables pre-calibration pH measurements (older FireSting-PRO meters can be upgraded) in combination with the bare optical fiber SPFIB-BARE (NOT SPFIB-LNS). This enables straigthforward measurements under sterile conditions or in single-use applications. Simply integrate the sensor under sterile conditions and start measurements in your set-up. After first use of the precal pH sensor, the sensor can be continued to use after a manual calibration (mandatory). This new plug & play pH sensor solutions offers new customer-friendly applications in life sciences requiring sterile conditions.

pH range 4.0-6.0 This sensor is specified for the pH range 4.0-6.0. For detailed specifications, see the respective pdf file in the Downloads tab.

Precalibrated pH measurements In combination with the bare optical fiber SPFIB-BARE only, the pH sensor spots can be used once without a manual calibration. For precision pH measurements a manual sensor calibration is mandatory before the measurement.

No reference electrode needed. Based on the optical sensing principle (REDFLASH technology), the pH value is measured directly on the sensor surface without a reference electrode.

Optical isolation.This sensor type is equipped with an additional optical isolation protection layer. This layer reduces enhanced sensor aging and interference with the measurements in applications at high ambient light (e.g. direct sunlight, illuminated samples) and in fluorescing / light-sensitive samples.

Easy calibration. Calibration of the pH sensors is performed at pH 2 and pH 11 using our easy-to-use calibration capsules (PHCAL2 and PHCAL11). For detailed calibration recommendations, please refer to the manual in the downloads tab.

Sterile sensor. This sensor was sterilized using 25kGy beta-radiation and is delivered in separate sterile packagings.

Standard stock item. This item is typically in stock and small numbers can be shipped quickly. This does not apply for larger amounts, which ship with standard delivery time.

Temperature compensation. Due to the cross sensitivity to temperature changes, the temperature compensation of the pH flow-through-cells can be realized:

  • Using our flow-through-cell with integrated optical temperature sensor (TPFLOW) and connecting it into your stream shortly before/after the pH sensor.
  • Using a Pt100 temperature probe and measuring the temperature of the sample shortly before/after pumping it into the flow-through cell.
  • Keeping the sample at a constant temperature using a thermostatic bath and using fixed temperature in the software.

Applications. To get an overview of potential applications and to see our sensors in action, please visit our Applications site!

Every PyroScience pH meter is generally compatible to this sensor. Pay attention to the correct optical fiber for contactless readout. All options can be found under accessories for contactless readout. Use the link below to get a list of all compatible meters. Select additional requirements to find the optimal meter for you and your application!


Exemplary Setup


Choose the multi-analyte FireSting-PRO (4 chan.) with the pH flow-through cell PHFLOW-PK5

  • 4 freely configurable optical channels
  • + oxygen & temp sensor support

Exemplary Setup


Choose the OEM module for optical pH sensors PICO-PH with the pH flow-through cell PHFLOW-PK5

  • 1-channel OEM device
  • For read-out of optical pH sensor spots
  • Compact dimensions: 59 x Ø17mm
  • UART interface, very low power consumption

Exemplary Setup


Choose the underwater OEM pH meter PICO-PH-SUB with the pH flow-through cell PHFLOW-PK5

  • 1-channel underwater OEM device
  • Compact dimensions 59 x Ø17 mm
  • Very low power consumption
  • UART interface

Optical Fiber


  • For contactless sensor readout
  • Optical fiber core Ø = 1mm
  • Ca. 1m length
  • With ST-connector and bare fiber end
  • To measure through 0-2mm thick materials

Fiber for Contactless Readout


  • Fiber diameter Ø = 2mm
  • With PICO-connector, ca. 1m length
  • To measure oxygen and optical temperature sensor spots through 0-10mm thick transparent windows
  • To measure pH sensor spots through 0-5mm thick transparent windows

Calibration Capsules (pH 2)


For obligatory acid calibration of optical pH sensors. Each capsule results in 100mL calibration solution (PU=10).

Calibration Buffer Capsules (pH 11)


For recommended basic calibration of optical pH sensors. Each capsule results in 100mL calibration buffer solution (PU=10).

Price List

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