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pH Sensors

Accurate and robust pH sensors for process analytics from Metroglas are designed with integrated temperature sensors and standard connector options.

All our pH sensors are certified according to IP68. Models designed for the chemical industry additionally have an ATEX rating option.

These sensors are low-maintenance and are characterized by stable measurement signals thanks to the use of pre-pressurized reference systems and maintenance-free electrolytes.

The optimized designs and proven materials used in the production of Metroglas sensors facilitate reliable measurement results even in harsh environments, during regular autoclaving, and sterilizations.

Inline pH sensors for pharmaceutical and biotechnology applications (model 200, model 300)

These combined pH sensors with an integrated temperature sensor (Pt1000) are specifically developed for applications in the pharmaceutical and biotechnology sectors. Both sensors are fully autoclavable up to 135 °C. These low-maintenance sensors have an integrated silver ion trap to prevent any contamination by Ag ions.

The inline model 300 is a pH sensor with pre-pressurized reference system. As such, it can measure pH values in process conditions of up to 4 bar, providing stable measurement results and low drift. Additionally, this sensor is designed to fulfill ATEX directives on demand and if required, it can be used in locations classified as hazardous areas.

The inline model 200 pH sensor can be used at pressures of up to 1 bar and within a temperature range of 0–80 °C.

Both sensors are available in different lengths with either a digital RS485 or an analog interface equipped with VP4/8 connector.

Inline pH sensors for the chemical industry (model 250, model 350)

These inline pH sensors are specifically designed to deliver reliable results even under the harsh process conditions typical for the chemical industry. They are extremely robust and can be used in environments with pressures up to 4 bar and temperatures up to 120 °C, as well as in highly alkaline solutions.

Our low-maintenance inline pH sensors exhibit consistent measuring performance throughout their entire lifespan. This is achieved by pre-pressurized reference systems and maintenance-free electrolytes.
Both inline pH sensor models 250 and 350 are designed to comply with ATEX directives upon request. These sensors can be used in hazardous areas if necessary.

These inline pH sensor models are available in various lengths, and can be manufactured with either a digital RS485 or analog interface equipped with VP4/8 connector

Key Benefits

  • Reliable measurement results even after use in demanding operating conditions, regular autoclaving, or sterilization cycles
  • Robustness ensured by carefully selected materials and proven technologies
  • Low maintenance and stable reading results over the entire sensor lifespan due to the use of pre-pressurized reference systems and maintenance-free electrolytes
  • Sustainable performance thanks to prevention of contamination by silver with the integrated silver ion trap

Technical Specifications

200

300

250

350

Industry

Biotech/Pharma

Biotech/Pharma

Chemistry

Chemistry

Measuring range

0–12 pH

0–12 pH

0–14 pH

0–14 pH

Membrane

HT glass

HT glass

H glass

H glass

Shaft material

Glass

Glass

Glass

Glass

Diaphragm

Glass sleeve 

Ceramic pin

Glass sleeve 

Ceramic pin

Temperature sensor

Pt1000

Pt1000

Pt1000

Pt1000

Electrolyte

Saturated KCl gel

Pre-pressurized gel

(3M KCl)

Pre-pressurized gel

(3M KCl)

Pre-pressurized gel

(3M KCl)

Reference system

Ag/AgCl reference with

Ag-scavenger

Ag/AgCl reference with

Ag-scavenger

Ag/AgCl reference with

Ag-scavenger

Ag/AgCl reference with

Ag-scavenger

Temperature range

0 – 80 °C

0 – 120 °C

0 – 120 °C

0 – 120 °C

High temperature

<20 min 135°C

<20 min 135°C

<20 min 135°C

<20 min 135°C

Pressure                           

1 bar 

 

4 bar (pre-pressurized)

 

4 bar (pre-pressurized)

 

4 bar (pre-pressurized)

 

Shaft diameter

 

12 mm

 

12 mm

 

12 mm

12 mm

Sensor connector

VarioPin, PG 13.5

VarioPin, PG 13.5

VarioPin, PG 13.5

VarioPin, PG 13.5

Output signal

Analog or Digital

Analog or Digital

Analog or Digital

Analog or Digital

Min. Immersion

depth

 

25 mm

25 mm

25 mm

25 mm

Length (mm)

120, 225, 325, 425

120, 225, 325, 425

120, 225, 325, 425

120, 225, 325, 425

ATEX

No

No

on demand

on demand

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