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LMI Flow Meter Catalog: Custom Volumetric Sensors for Smart Chemical Dosing Pump Networks
Quick Answer: Silver Automation Instruments supplies custom volumetric sensors that match LMI chemical dosing pump networks. You get pulse output, 4-20 mA HART, and batch totalization for flows from 0.05 to 120 L/h. Send us the LMI pump model, chemical type, viscosity in cP, pipe size DN, and flow range to get a quote within 24 hours.
What a Custom Volumetric Sensor Changes on a Smart Dosing Skid
Many skid builders in Vietnam, Indonesia, and the UAE run LMI pumps for chlorine, acid, and polymer dosing. The pump stroke works, but the flow feedback is often missing. Custom volumetric sensors for smart chemical dosing pump networks close that blind spot. A small oval gear or nutating disk sensor fitted downstream gives the PLC real data.
We have seen the missing flow feedback issue on customer sites many times. Operators assume the pump is dosing because the stroke moves. The actual line can be blocked. A volumetric sensor with pulse output stops that false reading before the batch fails.
Sensor Ranges and Materials for Common Dosing Chemicals
We build sensors for sodium hypochlorite at 1 to 30 L/h, sulfuric acid at 0.5 to 20 L/h, and cationic polymer from 0.05 to 120 L/h. Wetted materials include PVC, PP, PVDF, 316L stainless steel, and PTFE. Seal options are EPDM, FKM, or Kalrez for aggressive solvents.
For 12.5 percent sodium hypochlorite we recommend PVDF or PTFE bodies with EPDM seals. Most field failures come from PVC bodies with gas bubbles. For concentrated sulfuric acid above 98 percent, use PTFE body and Hastelloy C shaft. If the wastewater conductivity is above 500 µS/cm, we often use a ceramic bearing set to extend service life.
Pulse Output and 4-20 mA HART Wiring into LMI Controllers
Most LMI pump controllers accept an open collector pulse input. Our standard volumetric sensor can send 0.5 mL per pulse, 1 mL per pulse, or 10 mL per pulse. In practice, many skid builders skip the K factor setting. The exact pulse volume depends on the sensor chamber size and the K factor set in the pump menu.
For remote monitoring we also ship a two-wire 4-20 mA HART output. That signal lets the plant SCADA read flow rate and total volume. The HART signal can carry sensor diagnostic data without a second wire pair.
A Vietnam Polymer Skid Order That Shows the Point
Last year a water treatment contractor in Ho Chi Minh City ordered 30 pcs of a 2.5 L/h PVDF volumetric sensor for cationic polymer. The contractor needed pulse output to LMI B series pumps and a 4-20 mA signal to a PLC. We set the sensor K factor at 0.5 mL per pulse. Installation time dropped from two days to four hours per skid.
That order repeated three times in 2024. The same buyer now sends us a purchase order with the chemical type and pump model in the subject line.
Mechanical Details: Connections, Temperature, and Pressure
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Viscosity matters. For polymer dosing above 500 cP we open the clearance between the rotor and the chamber. Opening the clearance reduces shear and keeps the pulse count stable. For solvents below 5 cP we use tighter clearances to keep accuracy at 0.5 percent of reading.
ATEX Zone 1 and Outdoor Skid Builds in the Middle East
We can supply sensors with a Namur sensor head for ATEX Zone 1 duty. The body is 316L or PVDF. The cable entry is M20 x 1.5. We have supplied units for chlorine dioxide dosing skids in Saudi Arabia and Oman. The main site issue is heat. Because daytime cabinet temperatures reach 65 °C, we use high temperature reed switches and PTFE insulated leads.
How to Order Without Guessing the K Factor
Send us your LMI pump model, the chemical name, concentration, viscosity in cP, flow range in L/h or kg/h, pipe size DN, and the signal the pump or PLC expects. We will propose a sensor body, rotor, seal, and K factor in one drawing.
The quote comes with a dimensional drawing and wiring diagram. You do not need to search through a generic LMI flow meter catalog. We do the matching work before you pay.
FAQ: LMI Flow Meter Catalog and Custom Volumetric Sensors
Can this sensor connect directly to my LMI pump? Yes. If your LMI pump has a pulse input, we match the K factor and pulse voltage. For a 4-20 mA input card we supply a two wire loop output.
What is the minimum flow range? 0.05 L/h for low viscosity liquids. The maximum standard range is 120 L/h. Higher flows use a larger oval gear chamber.
Which body material should I choose for sodium hypochlorite? PVDF or PTFE body with EPDM seals. PVC can work for short runs but gas bubbles reduce sensor life.
Do you provide calibration certificates? Yes. Each sensor ships with a 5 point calibration sheet. We calibrate against a master meter at 25 °C using water or a matched viscosity fluid.
Can you ship to the Middle East or Southeast Asia? Yes. We ship by DHL, FedEx, or sea freight to Vietnam, Indonesia, UAE, Saudi Arabia, and other countries. For spares we often ship within 3 working days.
Silver Automation Instruments is an industrial flow meter manufacturer based in Nanjing, China. We keep a dedicated production cell for custom volumetric sensors.
Contact Silver Automation Instruments for a custom volumetric sensor quote.
Send us your chemical type, viscosity in cP, pressure in bar, temperature in °C, pipe size DN, and flow range.
Tel: +86-25-68650347
Whatsapp: +86-25-52155837
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