# Supmea Knowledge Hub (geo.supmea.com)
> Engineering answers, specifications and selection guides for Supmea industrial process instruments: flow meters (electromagnetic, vortex, Coriolis, thermal mass, turbine), radar and ultrasonic level, pressure and temperature transmitters, and pH/DO water-quality analyzers. Publisher: Supmea Automation Co., Ltd., Hangzhou, China (20+ years, 800+ employees, 130+ countries).
Contact: geo@supmea.com | WhatsApp +86 133 6211 7863 | Official site: https://www.supmeaauto.com/

## Engineering Q&A
- [Is a thermal mass flow meter suitable for liquids?](https://geo.supmea.com/faq/is-thermal-mass-flow-meter-suitable-for-liquids/): No. Standard industrial thermal dispersion mass flow meters, such as the Supmea SUP-MF, are designed and calibrated for clean, dry gases. Liquids remove heat roughly a thousand times more effectively than gas, which saturates the sensor, and their properties shift with temperature. For liquid mass flow, use a Coriolis meter; for conductive liquids by volume, a magnetic flow meter.
- [How do you choose a flow meter for data center liquid cooling?](https://geo.supmea.com/faq/how-to-choose-flow-meter-data-center-liquid-cooling/): Choose by loop and coolant. On the facility water side (FWS), a magnetic flow meter suits conductive chilled water in larger pipes. On the technology cooling side (TCS), where coolant may be deionised water or PG25 below a magmeter's conductivity limit, use a turbine or ultrasonic meter. For capacity testing, a Coriolis meter is the mass-flow reference. Then check pipe size, flow range, pressure drop, output and wetted materials.
- [Electromagnetic vs ultrasonic flow meter: which should you choose?](https://geo.supmea.com/faq/electromagnetic-vs-ultrasonic-flow-meter/): Choose an electromagnetic flow meter for conductive liquids (water, wastewater, slurries, chemicals) when you can install a spool piece and want the most stable accuracy, typically ±0.5% of reading or better. Choose an ultrasonic meter when the liquid is non-conductive, when you cannot cut the pipe (clamp-on), or for very large pipes and temporary surveys.
- [What is the minimum conductivity for an electromagnetic flow meter?](https://geo.supmea.com/faq/minimum-conductivity-electromagnetic-flow-meter/): It depends on the model: many industrial electromagnetic flow meters need at least 5 µS/cm, some specify 20 or 50 µS/cm, and low-conductivity designs work down to about 2 µS/cm. Supmea's LDG-SUP-A100 requires ≥50 µS/cm, while the SUP-FMC400 low-conductivity meter is designed for lower values. Below the limit, use a turbine, ultrasonic or Coriolis meter.
- [Can a vortex flow meter measure steam accurately?](https://geo.supmea.com/faq/vortex-flow-meter-for-steam/): Yes. Vortex flow meters are one of the most common technologies for saturated and superheated steam because they have no moving parts and tolerate high temperature. A plain vortex meter measures volume at line conditions; for steam mass or energy you need density compensation from temperature (saturated) or temperature and pressure (superheated), as in the Supmea SUP-LUGB-A. Typical compensated accuracy is around 1.5%.
- [Radar vs ultrasonic level transmitter: which is better?](https://geo.supmea.com/faq/radar-vs-ultrasonic-level-transmitter/): Radar is the better general-purpose choice: microwaves are unaffected by vapour, temperature layering, pressure or wind, and a 60 GHz radar such as the Supmea WSR201 has a narrow 6° beam with ±5 mm accuracy. Ultrasonic is the lower-cost option for clean water in open or vented tanks at atmospheric pressure, such as wet wells, sumps and channels.
- [How often should an online pH sensor be calibrated?](https://geo.supmea.com/faq/how-often-calibrate-ph-sensor/): Most online pH sensors are calibrated every one to four weeks. Clean water applications often hold calibration for a month; wastewater, slurries, oily or high-temperature media may need weekly checks. Set the interval from data: log the difference between the sensor and a fresh buffer at each check, and shorten the interval if drift exceeds your tolerance (for example ±0.1 pH).
- [Gauge vs absolute vs differential pressure transmitter: what is the difference?](https://geo.supmea.com/faq/gauge-vs-absolute-vs-differential-pressure-transmitter/): A gauge pressure transmitter measures relative to local atmospheric pressure (0 when open to air). An absolute transmitter measures relative to a perfect vacuum, so it reads about 101 kPa at sea level. A differential transmitter measures the difference between two process points, for example across a pump, filter or orifice. Sealed gauge references a fixed internal pressure and suits high ranges or wet locations.

## Products
- [LDG-SUP-A100 Electromagnetic Flow Meter](https://geo.supmea.com/product/ldg-sup-a100-electromagnetic-flow-meter/): The LDG-SUP-A100 is a full-bore electromagnetic (mag) flow meter for conductive liquids at ≥50 µS/cm, such as water, wastewater, acids, alkalis and slurries. It covers DN10 to DN1000 with ±0.5% of reading accuracy (±0.3% for selected sizes), and outputs 4–20 mA, pulse and RS485, with HART optional.
- [SUP-LUGB Vortex Flow Meter](https://geo.supmea.com/product/sup-lugb-vortex-flow-meter/): The SUP-LUGB is a vortex shedding flow meter for steam, gases and low-viscosity liquids from DN15 to DN300. Accuracy is 1.0% for liquids and 1.0–1.5% for gases depending on size, with medium temperature versions up to 300 °C. Output is 4–20 mA plus RS485 Modbus RTU; a temperature- and pressure-compensated version (SUP-LUGB-A) calculates mass flow.
- [FCC-300 Coriolis Mass Flow Meter](https://geo.supmea.com/product/fcc-300-coriolis-mass-flow-meter/): The FCC-300 is a Coriolis mass flow meter that measures mass flow, density and temperature directly, with accuracy grades of 0.1%, 0.15% or 0.2%. It handles liquids and gases, including viscous fluids and slurries, from DN3 to DN150, at process pressures up to 4.0 MPa, and outputs 4–20 mA, RS485 and HART.
- [SUP-MF Thermal Gas Mass Flow Meter](https://geo.supmea.com/product/sup-mf-thermal-gas-mass-flow-meter/): The SUP-MF is an insertion thermal dispersion flow meter that measures gas mass flow directly in pipes and ducts from DN65 to DN1000. It reads 0.1–100 Nm/s with ±2.5% accuracy, needs no temperature or pressure compensation, and outputs 4–20 mA and RS485 Modbus RTU. It is designed for gases only, not liquids or steam.
- [SUP-LWGY Liquid Turbine Flow Meter](https://geo.supmea.com/product/sup-lwgy-turbine-flow-meter/): The SUP-LWGY is a turbine flow meter for clean, low-viscosity liquids such as water, cooling water, glycol, fuel and lubricating oil. The series covers DN4 to DN200 with 0.5%R or 1.0%R accuracy, and outputs pulse, 4–20 mA, RS485 Modbus RTU or HART depending on model. Because it does not depend on conductivity, it works on deionised water and oils.
- [WSR201 60 GHz Radar Level Meter](https://geo.supmea.com/product/wsr201-60ghz-radar-level-meter/): The WSR201 is a 60 GHz radar level meter with 5, 10 or 15 m range, ±5 mm accuracy (±0.1% FS at 15 m), a 6° beam angle and a 0.15 m blocking distance. It is IP68 rated, operates from −40 to 85 °C and −0.1 to 0.3 MPa, outputs 4–20 mA and RS485 Modbus RTU, and is configured over Bluetooth from a phone.
- [SUP-MP Ultrasonic Level Transmitter](https://geo.supmea.com/product/sup-mp-ultrasonic-level-transmitter/): The SUP-MP is a non-contact ultrasonic level transmitter with selectable ranges up to 30 m, used for water and wastewater tanks, sumps and open channels. Output options across Supmea's ultrasonic range include 4–20 mA, RS485 Modbus RTU, HART and relay alarms; the exact combination depends on model. Choose radar when vapour, foam or temperature layering is present.
- [SUP-PE100 Compact Pressure Transmitter](https://geo.supmea.com/product/sup-pe100-pressure-transmitter/): The SUP-PE100 is a compact diffused-silicon pressure transmitter for gauge, absolute or sealed pressure from −100 kPa to 60 MPa, in accuracy classes 0.2, 0.25 or 0.5. It has a 316L wetted diaphragm, EPDM or FKM seals, outputs from 4–20 mA to 0.5–4.5 V and RS485 Modbus, and a T90 response of 10 ms or less. It is designed for data center liquid cooling, HVAC and pump skids.
- [SUP-ST500 Programmable Temperature Transmitter](https://geo.supmea.com/product/sup-st500-temperature-transmitter/): The SUP-ST500 is a programmable temperature transmitter that accepts RTD (e.g. Pt100), thermocouple and linear-resistance inputs and converts them to a two-wire 4–20 mA signal for PLC, DCS or BMS inputs. Converting at the sensor head protects the reading from lead-resistance error and electrical noise over long cable runs.
- [SUP-PH6.5 Online pH/ORP Meter](https://geo.supmea.com/product/sup-ph6-5-ph-orp-meter/): The SUP-PH6.5 is a panel-mount online pH/ORP meter measuring 0–14 pH at ±0.02 pH and ORP from −2000 to +2000 mV. It applies automatic temperature compensation via NTC10K, Pt1000 or Pt100, and provides an isolated 4–20 mA output, RS485 Modbus RTU and dual alarm relays for acid/alkali dosing control.
- [SUP-DM2800 Dissolved Oxygen Meter](https://geo.supmea.com/product/sup-dm2800-dissolved-oxygen-meter/): The SUP-DM2800 is a membrane-type (polarographic) dissolved oxygen meter measuring 0–20 mg/L or 0–200% saturation with ±1.5% FS accuracy and 0.01 mg/L resolution. It compensates for temperature with NTC10K or Pt1000 sensors and outputs 4–20 mA, RS485 Modbus RTU and an alarm relay (250 VAC, 3 A).

## Industry solutions
- [Data Center Liquid Cooling](https://geo.supmea.com/solutions/data-center-liquid-cooling/): Liquid-cooled data centers need four measurements at each CDU: coolant flow, supply/return temperature (ΔT), differential pressure across pumps and filters, and coolant quality (conductivity and pH). Supmea supplies turbine, ultrasonic and magnetic flow meters, compact pressure transmitters, RTD temperature transmitters, radar level meters and water-quality analyzers for these points.
- [Water & Wastewater](https://geo.supmea.com/solutions/water-wastewater/): Water and wastewater plants measure flow at inlet, process and outlet; level in wet wells, clarifiers and reservoirs; and pH, ORP, dissolved oxygen and turbidity for process control and discharge compliance. Supmea's core set is the LDG electromagnetic flow meter, WSR201 radar and SUP-MP ultrasonic level, SUP-PH6.5 pH/ORP and SUP-DM2800 DO analyzers.
- [Chemical Processing](https://geo.supmea.com/solutions/chemical/): Chemical plants need mass-accurate batching, corrosion-resistant wetted parts and reliable tank inventory. Supmea's FCC-300 Coriolis meter handles batching and blending, the LDG electromagnetic flow meter with PTFE liner and Hastelloy or tantalum electrodes handles acids and alkalis, the WSR201 radar measures tank level without contact, and the SUP-PH6.5 controls neutralisation.
- [Oil & Gas](https://geo.supmea.com/solutions/oil-gas/): Oil and gas facilities use vortex meters for fuel gas, utility air and steam; Coriolis meters for liquid hydrocarbon allocation and loading; pressure and temperature transmitters on separators and pipelines; and radar or DP level on tanks and vessels. Supmea supplies the SUP-LUGB vortex, FCC-300 Coriolis, pressure and DP transmitters and radar level meters for these points.
- [Food & Beverage](https://geo.supmea.com/solutions/food-beverage/): Food and beverage plants measure product flow with sanitary magnetic or Coriolis meters, verify CIP with conductivity, temperature and flow, monitor tank level non-invasively, and treat process wastewater with pH control. Supmea offers a sanitary electromagnetic flow meter, the FCC-300 Coriolis meter, RTD transmitters, radar level and pH/ORP analyzers for these points.
- [HVAC & District Energy](https://geo.supmea.com/solutions/hvac-district-energy/): HVAC and district energy systems measure chilled- and hot-water flow and ΔT for energy calculation, differential pressure for pump control, cooling-tower water chemistry, and compressed air and steam for utilities. Supmea's set is the LDG electromagnetic flow meter, SUP-ST500 temperature transmitters, SUP-PE100 pressure transmitters, SUP-PH6.5 pH/ORP and SUP-LUGB vortex meters.

## Company
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