Model Q46F/82 Direct Fluoride Monitor from ATI


ATI’s Model Q46F/82 Direct Fluoride Monitor provides continuous measurement of free fluoride concentration in potable water without sample conditioning. The system employs a fluoride sensitive ion selective electrode (ISE) which provides reliable measurements down to 0.1 PPM and as high as 1000 PPM. The system is designed for use in applications where the pH and conductivity of the water are relatively stable. Fluoride measurement applications with widely varying sample conditions may require a more sophisticated system employing automated sample conditioning such as ATI’s Q46F-AutoChem system.

Many drinking water systems add fluoride to their water to help their residents prevent tooth decay. To achieve a fluoride concentration of about 1 PPM, a hydrofluorosilicic acid or sodium fluoride solution is metered into the process at a rate that is proportional to total plant flow. However, flow control problems may result in a loss of chemical feed or over-feed condition. An on-line fluoride monitor can provide reliable control of chemical addition for a consistent fluoride concentration.

Fluoride monitoring systems are easy to install, requiring a ¼” O.D. sample tube connected to a special flowcell provided as part of the system. Inlet flow must be regulated to 6 GPH (0.4 LPM) or less and should be stable. As an option, ATI can supply the fluoride monitoring system factory mounted on a panel containing all necessary flow controls and a visual flow indicator.

Specifications – Electronic Monitor

Range 0-20.00 ppm minimum, 0-2,000 ppm maximum
Accuracy ±1mV concentration equivalent (0.1 ppm at 1 ppm, 0.5 ppm at 10 ppm)
Repeatability ±0.5mV concentration equivalent
Drift <0.5 ppm per month on 20 ppm scale (stable pH & conductivity)
Power 100-240 VAC, 50/60 Hz maximum, 12-24 VDC, 500 mA maximum
Analog Output 2 isolated 4-20 mA, 500Ω load maximum
Relays # SPDT, contacts rated 6 amp@ 250VAC, 5 amp@ 24VDC
Digital Options for Profibus-DP, Modbus RTU & TCP/IP or Ethernet IP
Display 4 digit, 0.75″ numberic LCD with 12 character second line, LED backlight
Enclosure NEMA 4X (IP-66) polycarbonate, V-0 flammabilty
Operating Temperature -20 – 60°C

Specifications – Sensor

Fluoride Sensor Fluoride ion selective electrode sensor
Sensor Cable 10′ standard
Response Time T90 in 60 seconds
Measurement Chamber Cast acrylic
Inlet Sample Flow Rate 1-6 GPH through flowcell (0.06-0.40 LPM)
Sample Inlet ¼” od instant tube fitting
Sample Outlet ¼” od instant tube fitting
Operating Temperature 2-50°C
pH Range 5-9 pH but stable to ±0.2 pH
Conductivity Stable to ±50 µS
Inlet Pressure Control to <5 psi (0.3 bar)
5-150 psi (90.3-10 bar) for flow plate assembly

Ordering Information

For pricing please call AFC International at 800-952-3293, 219-987-6825 or fax 219-987-6826 or email


Model Q46F/82 Direct Fluoride Monitor datasheet

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