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Coriolis Flow Sensors and Coriolis Flow Transmitters: Industrial High-Pressure Chemical Batching Hardware

Quick Answer: High pressure chemical batching needs a Coriolis mass flow sensor rated above your maximum working pressure, paired with a transmitter that sends live mass flow, density, and temperature data back to your PLC. Silver Automation Instruments supplies loose sensors, transmitters, and complete Coriolis flow meters from DN15 to DN150. Send your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h.

Batching errors on a high pressure reactor line cost more than the meter. This guide focuses on Coriolis flow sensors and Coriolis flow transmitters used as industrial high pressure chemical batching hardware. We see this in chemical plants in Indonesia, Thailand, and Vietnam where plant engineers replace turbine meters with Coriolis hardware because the turbine bearings fail and the pulse output drifts.

Why Sensor Pressure Rating Is the First Filter

Start with the metal and the pressure class. Most Coriolis sensor tubes are 316L stainless steel. For aggressive chemicals, you may need Hastelloy C22 or a PTFE lined option. Silver Instruments keeps standard stainless steel sensors from DN15 to DN80 on short lead time. Larger DN100 and DN150 sensors are built to order. A DN25 sensor with ANSI 600 flanges can handle around 99 bar at 20 °C. At 150 °C that number drops. So you need the temperature and pressure together, not just the cold rating. Most engineers skip this part. They send a pressure of 20 bar, but forget that the batch reactor jacket runs at 150 °C and the product line sees pressure spikes during pump start. We have seen a paint manufacturer in Southeast Asia order a standard PN40 sensor and then add a safety factor of 1.5 because the dosing pump generated a water hammer spike above 55 bar. That margin saved the meter from tube fatigue.

The Transmitter Is Not a Small Detail

Here is the thing. A Coriolis sensor only works when the transmitter drives the tube, reads the phase shift, and calculates mass flow. The transmitter must match the sensor model and calibration data. Silver Automation Instruments supplies both separate Coriolis flow sensors and Coriolis flow transmitters for batching systems. The transmitter outputs 4-20 mA HART as standard. Some models add MODBUS RTU, pulse output for totalized batch quantity, and two digital outputs for alarms.

For high pressure chemical batching, we recommend a transmitter with a local display and a remote mount option. The display shows mass flow rate in kg/h, total batch weight in kg, density in g/cm3, and temperature in °C. The remote mount keeps the electronics away from hot reactor piping. In practice this matters more than the sensor protection. A failed transmitter on a dosing line shuts down the whole batch without any visible leak.

Flow Ranges and Line Sizes for Typical Chemical Batching

Coriolis meters are sized by mass flow, not velocity. A DN15 meter may handle 0 to 1000 kg/h for low viscosity solvents. A DN25 meter often covers 0 to 3000 kg/h for resins and bases. A DN50 meter works for 0 to 15000 kg/h on larger transfer lines. The exact range depends on viscosity in cP, density, and pressure drop. Do not size a Coriolis meter based only on pipe diameter. A DN40 process line may need a DN25 meter because the batch flow rate is low and the product viscosity is high.

Last year a customer in Vietnam asked us for a DN25 Coriolis meter to dose isocyanate at 40 bar and 80 °C. The line size was DN25, but the actual batch flow was only 120 kg/h during the first stage and 850 kg/h during the final stage. We selected a DN15 sensor to keep the low flow accuracy within 0.1 percent. The smaller sensor also reduced the pressure drop across the meter from 1.8 bar to 0.6 bar. That is the kind of detail that changes the batch consistency.