Self-Adhesive Sterilized pH Sensor Spots


  • Self-adhesive sensor spots (8 pcs.) 5mm in diameter
  • Sterilized using 25kGy beta-irradiation
  • Measurement range pH 6.0-8.0
  • Precalibrated for plug & play sterile measurements
  • Contamination-free non-invasive measurement

pH sensor spots allow pH measurements over a defined pH range of 6-8 in closed sample containers with contactless read-out through a transparent window (glass, acryl glass), with special adapters and optical fibers for fiber-optic meters from PyroScience. This enables incubations in closed systems, preventing potential contamination and simplifying pH monitoring without sampling, also in combination with oxygen and temperature sensor spots.

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.

Self-adhesive technology. The spots are equipped with a self-adhesive glue on the backside of the spot for easy integration into transparent plastic or glass containers. This eliminates the use of glue and potential contamination of the spot. For information on adhesive properties, please refer to the technical note in the download tab. For measurement conditions where detachment of the spot can occur, it is advised to use the standard spots with SPGLUE.

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

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.

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 or in combination with the lens optical fiber SPFIB-LNS, 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.

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.

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.

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

Optical Fiber with Lens


  • For contactless sensor readout
  • Ca. 1m length
  • through thick walled containers
  • Compatible to SPADBAS
  • With ST-connector for FireSting devices

Basic spot adapter


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

Fiber Rod for Contactless Readout


  • Stainless steel tube Ø = 3mm
  • With PICO-connector, ca. 40mm 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

Silicone Glue


  • Transparent silicone glue Elastosil E43, (ca. 90 ml)
  • For fixing sensor spots or SPADBAS at container walls

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).

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 sensor spots PHSP5-PK7-ADH-STER

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

Would you like to stay informed?