McNab Model AP-VIE Concentration Monitor / Controller

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Printable Version

Special Features:

  • Reduced cost
  • Easy installation, no Indicator/Controller (I/C) panel
  • Second cabinet not required for water-proofing
  • Available in proven sanitary (non-o-ring) design
  • Air purge or air driers for moisture control in optics
  • Relative humidity (RH) indicator to alert potential window fogging
  • 10 times illumination of LED
  • Avoids lamp aging resistance drift
  • Avoids field inter-connecting cable calibration
  • Automatic correction of lamp darkening

Technical Papers

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Typical Configuration

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Explosion-proof housing

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Narrow diameter pipe


The Model AP-VIE Concentration Transmitter is a compact sensor with integrated electronics. It measures changes in the amount of light from the light source that is received at the photoelectric scanner. It continuously monitors concentration, suspended solids interface or color, by direct measurement in the process pipe. The optical cell “no o-ring” sealing meets sanitary requirements as set forth by EHEDG.

A91-60_AP-VI_Family.jpg (53146 bytes)Model AP-VIE provides immediate center-of-the-pipe measurement at full pressure and temperature, eliminating the delay of off-line sampling. The information is transmitted to the customer computer or process controller using a 4-20 mA analog signal. Internal relays are available to open or close valves when designated concentration levels are reached.

Installation involves mounting optical ferrules on a vertical run of pipe (with upward flow) where the process measurement is needed. Visual inspection of the light path can be done at any time during operation by removing the photo sensor head from the optical cell and looking through the optical cell like a sight glass.


Technical Drawings


Material of Construction: Stainless steel, ASTM 316L/DIN 1.4404
Seals: Ethylene propylene (EPDM), Kalrez, etc.
Protective Enclosure: NEMA 6 (submersible), IP68
Mounting: Sanitary flange, 2 inch Tri-clamp, or McNab standard
Operating Temperature: 15 to 225° F (-10 to 115° C)
Operating Pressure: 150 psig, 10 bar
Power Requirements: 117 or 220 VAC, 50/60Hz, 50 watts (max.)
Standard Output: 0-10 Volt DC
Optional Output: 4-20 mA Ground Isolated, internal or user supplied Excitation Voltage. (Up to 30 volts maximum)
2 SPST closures, 115/230 VAC (only), 0.10 Amp max, or
1 SPDT, 115/230 VAC/VDC, 5 Amp electro-mechanical
Sensitivity: Adjusted per application
Weight 20 lbs. (9.1 Kg.) max.
Specifications may be changed or improved as necessary.

383-2 East 29th Street | Buena Vista, VA | USA 24416-1293

540.261.1045 voice | 540.261.1268 fax |

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