pH Vial


  • 20 ml vial with integrated pH sensor stripe
  • Diameter / height: ca. 28 mm / ca. 61 mm
  • Measurement range pH 6.0-8.0

Based on the contactless sensor technology, PyroScience offers ready assembled vials with integrated sensor stripes for pH. The glass respiration vials have screw caps with a septum, and are available with ca. 20mL (uncalibrated) volume. Adapter rings allow an easy fixation of optical fibers for read-out with optical oxygen meters from PyroScience for incubations in closed vials and/or respiration rate measurements. The elongated shape of the sensor spots allows also pH measurements at different heights within the vial using several fibers/adapter rings in parallel.

pH range 6.0-8.0 This sensor is specified for the pH range 6.0-8.0. For detailed specifications, see the respective pdf file in the Downloads tab.

Optical isolation. For applications at high ambient light (e.g. direct sunlight, illuminated samples) and in fluorescing / light-sensitive samples, an additional optical isolation (-OI) protection layer is added to the sensor surface to reduce enhanced sensor aging and to avoid interference with the oxygen measurements

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

Price List

Please visit our accessories site for all available accessories for our contactless sensors.

Adapter Ring


  • Adapter ring for 20mL vials with up to 3 sensors
  • Compatible to SPFIB-BARE and PICFIB2

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

Calibration Buffer Capsules (pH 4.0)


For obligatory acid calibration of optical pH sensors. Each capsule results in 100mL calibration buffer 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).

Septa & lids for 20 ml sensor vials


  • Septa with lids (with and without hole)
  • For replacement in 20mL sensor vials from PyroScience
  • PU = 4 pieces

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 & temperature vial PHVIAL20-PK7 and all necessary accessories.

  • 4 freely configurable optical channels

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