MODEL YB8 INSTALLATION AND OPERATION
April 1999/Manning Environmental Inc.
Page A-3
Figure 1 - Electronics
Enclosure
Controller Microprocessor based 1 board system which controls all functions of the unit.
Membrane Ergonomically designed, hermetically Sealed, 24 key, multiple function, with 2 line by
Switch 20 character alphanumeric backlighted display.
Electronics 100% Solid State.
Internal Clock Indicates real time with ± 1min/month accuracy.
Internal Battery 5 year internal lithium battery to maintain program lo gic, RAM memory, real t ime
clock and date.
Power 115 volt AC, 60 Hz. - Standard
Battery Back-Up Optional 12 VDC battery backup for continued operation in case of 115 volt power
220 volt AC, 50 Hz . - Optional
failure. C ontinues t o operate t he sampling control unit only, n ot t he refrigerator.
Analog Input 4-20 mA - Optional
Subassemblies
The sampler consists of three major subassemblies: the electronics enclosure, the refrigerator, and the wetted
parts. As a unit these subassemblies form an environmentally resistant enclosure.
Electronics Enclosure
The electronics enclosure includes the microprocessor-based controller, the
peristaltic pump, and the liquid sensor. Constructed of structural resin, the
enclosure conforms to Nema 4X,6 requirements when latched.
The Controller
The controller electronics consists of 1 board. The board converts outside
power to the appropriate internal use and controls the input/output signals
associated with the sampler. The CPU board contains a Z180 microprocessor,
RAM and ROM memory, and interfaces for the keyboard, and the display. The micro board also contains the
logic for the liquid sensor and the RPM counter. The user communicates to the sampler via a 24 key multiple
function membrane switch. The keys are clearly marked with their designated functions. An internal battery
maintains the program logic, RAM memory, and the controller's real-time clock and date function. T he
electronics are mounted on the back of the controller.
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