Human Humalyzer 2000 - Introduction Nn

Rev. B 1
Introduction
The instrument is a general-purpose, bichromatic photometer system with six available
wavelengths and 37°C incubation. Two additional wavelengths are optional, for a total of eight
filters. A removable flowcell provides extremely rapid fluid sampling with low carryover. A
built-in vacuum pump and an external autoclavable waste bottle with level sensing are supplied
standard. When the flowcell is removed, the instrument accepts standard 12 mm round tubes as
well as 1 cm square cuvettes. The instrument also contains an incubation block with 12 round
tube stations. Both the incubation block and the read well are temperature controlled to 37°C.
Layout
Figure 1 shows the exterior-of the instrument, Figure 2 shows the inside of the cover assembly,
and Figure 3 shows the chassis layout. For clarity, some cabling arrangements are not shown.
The interface PCB mounted inside the cover behind the front panel, connects to the main PCB by
a 26-conductor ribbon cable and header. A 2-conductor cable running from the main PCB to the
interface PCB supplies separate power for the internal printer. The printer PCB connects to the
interface PCB via a 14-conductor ribbon cable terminated with IDC 14-pin DIP plugs. The serial
port connector (DB-9P) connects to the main PCB with a 4-conductor cable. The parallel port
(DB-25S, IDC) connects to the interface PCB via a 26-conductor ribbon cable and header.
Finally, a 4-conductor cable connects the ready/sample PCB to the interface PCB.
All AC mains (high voltage) circuitry is enclosed behind the AC cover. However, three 18
AWG wires feed 115VAC with ground to the incubation block heater PCB. Note that the block
itself is tied directly to this ground.
WARNING
Hazardous line voltages are present behind the AC cover and
beneath the incubation block. Always disconnect the external
AC power cable before servicing the instrument.
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