Products & Capabilities

In-line pH Sensors for Industrial and Bioprocess Monitoring

Reliable Probes for Online pH Measurements

Metroglas offers a range of reliable pH probes for biotech, pharmaceuticals and industrial applications.

Our in-line pH sensors are built for accuracy and durability. Each sensor includes an integrated temperature sensor and standard connectors for easy installation.

Thanks to pre-pressurized reference systems and maintenance-free electrolytes, these sensors deliver stable and consistent measurement signals with minimal upkeep.

Designed with proven materials and optimized for demanding environments, Metroglas sensors ensure reliable performance even after routine autoclaving and sterilization.

 

pH Sensors Brochure

Key Benefits

  • Sustainable performance even under harsh conditions and frequent autoclaving cycles
  • Stable measurement results over the entire application time due to low drift and short response time
  • Enhanced connectivity compatible with standard transmitters and biocontroller systems
  • Variety of customization options to meet specific application needs

Explore Our Range of pH Sensors

pH 200: In-line Sensor for Bioprocess Application

This inline pH sensor is ideal for less demanding biotech and pharmaceutical applications. Designed for use under ambient pressure, it delivers reliable, accurate results, making it an cost-effective option for routine monitoring tasks.

Model
200
Industry
Pharmaceuticals and Biotechnology
Measuring Range
0–12 pH
Membrane
HT glass
Shaft Material
Glass
Diaphragm
Glass sleeve
Temperature Sensor
Pt1000
Electrolyte
Saturated KCl gel
Reference System
Ag/AgCl reference with Ag-scavenger
Temperature Range
0 – 80 °C
High Temperature
<20 min 135°C
Pressure
1 bar
Shaft Diameter
12 mm
Sensor Connector
VarioPin, PG 13.5
Output Signal
Analog (mV) or RS485, Modbus
Min. Immersion Depth
25 mm
Length (mm)
120, 225, 325, 425
ATEX
No

pH 300: In-line Sensor for Bioprocess Application Above Ambient Pressure

Designed for the specific needs of biotechnology and pharmaceutical processes, this inline pH sensor performs reliably in complex environments. It easily withstands autoclaving and sterilization, ensuring consistent accuracy and long-term durability.

Model
300
Industry
Pharmaceuticals and Biotechnology
Measuring Range
0–12 pH
Membrane
HT glass
Shaft Material
Glass
Diaphragm
Ceramic pin
Temperature Sensor
Pt1000
Electrolyte
Pre-pressurized gel (3M KCl)
Reference System
Ag/AgCl reference with Ag-scavenger
Temperature Range
0 – 120 °C
High Temperature
<20 min 135°C
Pressure
4 bar (pre-pressurized)
Shaft Diameter
12 mm
Sensor Connector
VarioPin, PG 13.5
Output Signal
Analog (mV) or RS485, Modbus
Min. Immersion Depth
25 mm
Length (mm)
120, 225, 325, 425
ATEX
No

pH 250: In-line Sensor for Chemical and General Applications With Unique Sleeve Diaphragm

Engineered for harsh industrial environments, this durable pH sensor is ideal for inline installations in tubes and pipes.

Its glass sleeve diaphragm allows complete flexibility in positioning, independent of flow direction, making it perfect for complex setups and high-performance applications.

Model
250
Industry
Chemistry
Measuring Range
0–14 pH
Membrane
H glass
Shaft Material
Glass
Diaphragm
Glass sleeve
Temperature Sensor
Pt1000
Electrolyte
Pre-pressurized gel (3M KCl)
Reference System
Ag/AgCl reference with Ag-scavenger
Temperature Range
0 – 120 °C
High Temperature
<20 min 135°C
Pressure
4 bar (pre-pressurized)
Shaft Diameter
12 mm
Sensor Connector
VarioPin, PG 13.5
Output Signal
Analog (mV) or RS485, Modbus
Min. Immersion Depth
25 mm
Length (mm)
120, 225, 325, 425
ATEX
On Demand

pH 350: In-line Sensor for Chemical and General Applications

This widely used inline pH probe is suitable for most industrial processes. Featuring a ceramic pin diaphragm, it offers reliable performance and proven durability, making it a trusted choice across various industries.

Model
350
Industry
Chemistry
Measuring Range
0–14 pH
Membrane
H glass
Shaft Material
Glass
Diaphragm
Ceramic pin
Temperature Sensor
Pt1000
Electrolyte
Pre-pressurized gel (3M KCl)
Reference System
Ag/AgCl reference with Ag-scavenger
Temperature Range
0 – 120 °C
High Temperature
<20 min 135°C
Pressure
4 bar (pre-pressurized)
Shaft Diameter
12 mm
Sensor Connector
VarioPin, PG 13.5
Output Signal
Analog (mV) or RS485, Modbus
Min. Immersion Depth
25 mm
Length (mm)
120, 225, 325, 425
ATEX
On Demand

pH 400: In-line Sensor for Chemical and General Applications with Highest Resistance to Demanding Conditions

This sensor is specially designed for accurate pH measurements in complex media with high particle content, such as slurries. It operates reliably at high temperatures and pressures thanks to its open-junction diaphragm, ensuring stable performance even in demanding industrial environments.

Model
400
Industry
Chemistry
Measuring Range
0–14 pH
Membrane
H glass
Shaft Material
Glass
Diaphragm
Open junction
Temperature Sensor
Pt1000
Electrolyte
KCl saturated polymer, hydrogel
Reference System
Ag/AgCl
Temperature Range
0 – 130 °C
Pressure
10 bar
Shaft Diameter
12 mm
Sensor Connector
VarioPin, PG 13.5
Output Signal
Analog (mV) or RS485, Modbus
Min. Immersion Depth
25 mm
Length (mm)
120, 225, 325, 425
ATEX
On Demand
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