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Flow meter for waste & natural gases

With its thermal mass flow sensor design, the ST98 flow meter provides direct mass flow measurement without the need for additional temperature or pressure sensors or density calculating devices.  

The meter’s insertion style configuration makes it simple to install in existing piping without cutting the pipe or welding, offering minimal interruption to plant operations.     

The ST98 flow meter is suitable for service in biogas and natural gas as well as other process gases, hydrocarbon or dirty gases and plant compressed air and HVAC systems.  

The ST98 can operate in electronics, oil/gas, chemical, power generation, food/beverage, pharmaceutical, pulp/paper, steel, wastewater treatment plants and more.

The ST98 flow meter provides accurate flow measurement over a wide flow range.  Accuracy is ±1% of reading, plus ±0.5% of full scale. 

The insertion style ST98 flow range is from 0.21 to 172 NPS in air at standard conditions of 21.2°C and 0°C and 1013,25 bar (a), typical for most gases. 

Designed for demanding environments, the rugged ST98’s thermal mass flow sensing element is constructed with two all-welded 316L stainless steel thermowells, protecting two matched platinum precision resistance temperature detectors (RTDs). 

One RTD is heated relative to the reference RTD, and the temperature difference between the two is proportional to the process gas mass flow rate.

The ST98 meter’s transmitter converts the differential temperature signal to a standard 4-20mA output.  

The meter’s transmitter with its RS232C communications port is housed in either a NEMA Type 4, Type 4X (IP66) enclosure or an explosion-proof enclosure and can be integrally mounted to the flow element or remotely mounted up to 150m away.  

In addition, an LCD display screen indicating flow rate, temperature and totalised flow is available as an option.  

With no moving piece construction, the ST98 is unaffected by plant vibration and there’s nothing to foul or break when placed near heavy equipment such as reciprocating engines.  

With its stable flow sensor, there is virtually no maintenance or re-calibration required, making it lowest total cost flow measurement solution over its long service life.

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