McNab Model HSA4 Cell Counter |
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Model HSA 4 is
a photometric plus yeast analyzer for pitching, cropping, transfer and
blending applications in breweries.
McNab Cell Counters provide precise yeast measurement and control by optically measuring yeast cells on the process line to facilitate pitching, cropping, transfer and blending applications. McNab Cell Counters consist of a two-chamber flow cell assembly and indicator/controller cabinet. The flow cell assembly mounts directly in the piping of the system being monitored, and the process beer passes through its center. Yeast content is measured at a 180o angle from the source light and is converted to an electrical signal proportional to the yeast concentration within the beer. This signal is sent to the indicator/controller cabinet. The cabinet contains the electronic circuitry necessary to convert the signals into readings in the required units, to display these readings, to input desired set points, to indicate the alarm levels, to operate the relays, and to perform self diagnostics. Cell Counter Applications
Diagram of Uses
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Cell Counter |
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Principle of Operation: | Direct optical measurement of yeast cell count and percent solids (spin-down), correlating to comparable optical measurements: ASBC Spin-Down (see Standard Reference Method) and cell count (Coulter counter). The indicator analyzer receives the electrical signal proportional to cells and NIR reference. The signals are sent to a range-defined algorithm, giving an ultra-linear signal proportional to concentration. The signals are zeroed, scaled, and passed on to the digital meter, the auxiliary output, and also the controllers. |
Measuring Range: | (a) 0 - 2 million cells/mL (b) 0 - 20 million cells/mL (c) 0 - 0.2 (000,000,000 billion cells/mL (d) 0 - 2 (000,000,000 billion cells/mL (e) 0 - 75% v/v cells spin-down |
Accuracy: | Range (typical) (a) 1.0% (as Standard Deviation) (b) 1.0% (as Standard Deviation) (c) 1.0% (as Standard Deviation) (d) 2.5% (as Standard Deviation) (e) 2.5% (as Standard Deviation) |
Linearity: | Deviation from a straight line Range (typical) (a) 0.02 million (b) 0.02 million (c) 0.002 (000,000,000) billion (d) 0.005 - .05 (000,000,000) billion (e) 1.5% |
Resolution: | 1 part in 2000 |
4-20mA: | 0 to nominal full-scale |
Enclosure: | Indicator electronics NEMA 4X
(stainless steel) Indicator temperature 0 to 60ºC (32 - 140ºF) Sensor assembly pressure to 10 bar (150 psi) Sensor assembly temperature 0 - 115º C (32 - 240ºF) Relative humidity to 100% |
Temperature Minimum: | 0ºC (32ºF) |
Window Fouling: | Automatic detector (accessory) |
Dead Cell Interference: | Adjust out per hemocytometer calibration, typically a near-constant value |
Trub Interference: | Automatic compensation |
Yeast Strain Correction: | Automatic |
Yeast Temperature: | Automatic compensation |
System Calibration: | Transfer from Coulter cell counter, spin-down, hemocytometer, or reference filter insertion |
Signal Wavelength: | Custom nm |
Reference Wavelength: | NIR nm |
Extension Cable: | Up to 120 meters (395 feet) |
Outputs | 0 to 10, 0.1 V; 1mA; 4-20 mA |
Power Loss Effects: | Automatic restart |
Specification 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 | info@themcnab.com Copyright © 1999 - 2010 McNab, Inc. All Rights Reserved. Last modified: 08.12.2010 |
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webmaster@themcnab.com | |
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