Hach Master Catalog 2025

Process Instruments • Multi-Parameter Orbisphere 31XXX TC Sensors

102

Selective gas measurement forCO 2 ,H 2 , orN 2 The Orbisphere patented Thermal Conductivity sensors have been developed to give continuous Carbon Dioxide (CO 2 ), Hydrogen (H 2 ), or Nitrogen (N 2 ) measurements in gas phase or dissolved in a liquid. The measuring technique is a combination of a gas di ff usion membrane and a solid-state gas thermal conductivity detector. A micro volume enclosed between a semi-permeable membrane and a thermal conductivity detector is periodically fl ushed with a purge gas. After each purge, the gas to be measured di ff uses from the sample through the membrane, changing the thermal conductivity of the gas surrounding the detector. A change in thermal conductivity modi fi es the detector resistivity. This is measured, together with temperature, to calculate the gas concentration.

Bene fi ts: • No sample preparation needed, gas concentration is measured directly in the sample. • Robust construction to handle harsh plant conditions and high sample pressures. • High temperature resistance to withstand cleaning in place (CIP). • Annual maintenance and traceable calibration, quick and easy to carry out for a minimum downtime.

Technical Data Standard (TC) Sensors* 314XX 312XX 312XX 315XX Parameter Carbon Dioxide (CO 2 ) Hydrogen (H 2 ) Hydrogen (H 2 ) Nitrogen (N 2 )

Order Information Prod.No. Parameter

Sample Pressure

PurgeGas

31490TC 31290TC 31292TC 31290HP 31292HP 31590TC 31593TC 31593HP 31594HP

Carbon Dioxide (CO 2 )

0 - 20bar 0 - 20bar 0 - 20bar 0 - 170bar 0 - 170bar 0 - 20bar 0 - 20bar 0 - 170bar 0 - 170bar

N 2 N 2

Hydrogen (H 2 ) Hydrogen (H 2 ) Hydrogen (H 2 ) Hydrogen (H 2 ) Nitrogen (N 2 ) Nitrogen (N 2 ) Nitrogen (N 2 ) Nitrogen (N 2 )

In-line beverage, semi conductors industry 0 - 50°C (32 - 122 °F)

Wastegas, o ff gas, and reactor coolant 0 - 50°C (32 - 122 °F)

CO 2

In-line beverage

Reactor coolant

Application

N 2

CO 2 CO 2

Sample Temperature

0 - 50°C (32 - 122 °F)

0 - 50°C (32 - 122 °F)

Argon Argon

Sample Pressure 0 - 20 bar 0 - 20bar Sample Flow Rate 100 mL/min 220 mL/min 200 mL/min 300 mL/min Linear Flow Rate 50cm/s N/A N/A 150cm/s 0 - 20bar 0 - 20bar

He

0 - 20 bar, or 0 - 350ppm, or 0 - 300mL/L

0 - 10 bar, or 0 - 15g/kg, or 0 - 7V/V

0 - 2ppm, or 0 - 25 cc/kg, or 0 - 1.5 bar

0 - 10 ppm, or 0 - 120 cc/kg, or 0 - 6bar

Range at 25 °C

±1%of reading

±1%of reading

±1%of reading

±2%of reading

Accuracy 1) CycleTime

22s

17s

17s

22s

Recommended PurgeGas Recommended Calibration Gas

PureCO 2 , orArgon

PureN 2 , or air Pure N 2 , or air

PureCO 2

PureCO 2 <1%of reading

PureH 2 <1%of reading

PureH 2 <1%of reading

PureN 2 <2%of reading

Signal Drift (per year)

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1) Accuracy for sample temperature between 20-50 °C, within ±5 °C of calibration temperature. Values may vary depending on the conditions of measurement and each sensor’s limit of detection.

*Subject to change without notice.