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Chlorine Gas Flow Meter: Thermal Mass Controls for Corrosive Water Treating
Quick Answer: A thermal mass flow meter from Silver Instruments measures chlorine gas mass flow directly in water treatment lines. It works for dry chlorine gas in DN15 to DN50 pipes used for disinfection and oxidation. The sensor uses Hastelloy C276 wetted parts and outputs 4-20 mA HART with optional Modbus.
Why Thermal Mass Flow Meters Fit Chlorine Gas Service
Chlorine gas flow is not easy to measure with volumetric meters. Pressure and temperature swings change the gas density. Thermal mass flow meters read mass flow directly, so the display shows kg/h or Nm3/h without a separate pressure transmitter or flow computer.
We have seen this on customer sites many times. A water utility in Vietnam used a DN25 chlorine line at 2 bar and 25 °C. They needed a flow range from 2 to 20 kg/h. A thermal mass flow meter with a 0.2 to 20 kg/h range fit the line without extra correction devices.
Material Selection for Wet and Dry Chlorine
Dry chlorine gas is less aggressive than wet chlorine. But both conditions require the right wetted parts. For dry chlorine, 316L stainless steel can work if the gas is clean and moisture free. For wet chlorine or any trace of moisture, specify Hastelloy C276 sensor elements and PTFE coated body parts.
Most engineers skip this part and then face sensor failure. Silver Instruments recommends Hastelloy C276 for the sensor wetted parts in any chlorine gas flow meter used for corrosive water treating. This material resists pitting and chloride attack.
Typical Water Treating Installations
Chlorine gas flow meters from Silver Instruments are used in drinking water plants and wastewater disinfection. They also appear in cooling tower chemical dosing. In Indonesia, a water treatment contractor installed a thermal mass flow meter on a DN40 chlorine header. The process pressure was 3 bar and the flow range was 5 to 50 kg/h.
Because the meter outputs mass flow directly, the control room received a clean 4-20 mA HART signal for the chlorine dose. No differential pressure transmitter was needed.
Output, Certification, and Integration
The Silver Instruments TMF-100 thermal mass flow meter for chlorine gas offers a 4-20 mA HART output with two relay alarms. Op
For hazardous area chlorine storage rooms, specify ATEX Zone 1 Ex db IIC T6 Gb certification. The meter can be installed with a 1/2 inch NPT compression fitting or DN15 to DN50 flanges.
Recommended Silver Instruments Model
For most water treating chlorine gas lines, the TMF-100 series is a good fit. Select the TMF-100 with Hastelloy C276 sensor elements. Choose a flow range of 0.2 to 20 kg/h for DN15 or DN25 lines. For DN40 lines, choose 5 to 50 kg/h.
Silver Automation Instruments is the manufacturer. We keep common models in stock and ship spare sensors to Southeast Asia, the Middle East, and Latin America.
FAQ
Q: Can a thermal mass flow meter measure chlorine gas in water treatment?
A: Yes. Thermal mass flow meters measure mass flow directly, so they fit dry chlorine gas dosing lines. For wet chlorine, use Hastelloy C276 wetted parts and confirm the moisture level with our application engineers.
Q: What wetted materials are required for chlorine gas service?
A: For dry chlorine, 316L stainless steel can work in clean conditions. For wet chlorine or corrosive water treating, select Hastelloy C276 sensor elements and PTFE coated body parts.
Q: Does the meter need pressure and temperature compensation?
A: No. Thermal mass flow meters measure mass flow directly. The output can be set in kg/h or Nm3/h without a separate pressure transmitter or flow computer.
Q: What output signals are available for chlorine gas flow control?
A: The TMF-100 provides 4-20 mA HART as standard. Optional RS485 Modbus and two relay alarms are available for control and alarm functions.
Q: What information do I need to request a chlorine gas flow meter quote?
A: Send us your gas type, pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h. For example: dry chlorine gas, 2 bar, 25 °C, DN25, 2 to 20 kg/h.
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range to get a chlorine gas flow meter quote from Silver Automation Instruments.
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