YSI 2900D handleiding
Handleiding
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6-6
Figure 6-7
If you are using an antiseptic, connect the tubing from the inner slot of the 2960 valve to your antiseptic container. Typical
solutions might include 1% sodium hydroxide,70% ethanol, 70% IPA or 0.25% hypochlorite in reagent water. Even if you
are not using an antiseptic solution, the solenoid valve still switches to the antiseptic position and air or fluid is pumped
through the antiseptic line during sample aspiration. The antiseptic line must be kept free from obstructions. A dry 0.2
micron filter may be connected to the antiseptic line to prevent contamination in the air from entering the line.
6.3.1 Sterilization
If your application requires aseptic monitoring, all tubing and connectors should be sterilized (autoclaved) prior to use. The
tubing, connectors and pump head should be assembled, the open ends of the tubing should be clamped off (two clamps
are provided) and the entire assembly (tubing with pump head) should be sterilized along with the bioreactor.
If the tubing is connected to the bioreactor after sterilization, a sterile connection must be made.
After sterilization the pump should be remounted onto the 2960 (see Section 9.6 2960 Maintenance for details). The
antiseptic cycle must be enabled and the antiseptic solution must be primed immediately after the tubing is reconnected.
Electrical Interface
6.4.1 Analog Outputs
The 2960 interface provides additional signals to aid in synchronizing the reading of the analog outputs. In addition to the
two analog outputs, three logical signals are provided. These "handshake signals" are nominally +5 volts for a logic 1 and
ground (0 volts) for a logic 0. The "READY" signals are output from the 2960 and are set to a logic 1 when the analog
output signal for that channel has been updated. This signal indicates to the host system that the analog voltage is "new"
and that it represents the most recent reading of the analyte concentration. The host system (the external system to which
the 2960 is connected) then can send a logic 0 to the "ACK" input of the 2960. This "ACK" (acknowledge) signal response
from the host resets the READY line of the 2960 to its low state before the next sample is ready.
Figure 6-8 below shows the typical signal pattern that would occur during two sample update cycles. The READY signals
will reset themselves immediately prior to updating the analog output if not reset externally via the ACK\ signal input.
From Sample
Source
(Outer Valve Slot)
From Antiseptic
(Inner valve slot)
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Productinformatie
| Merk | YSI |
| Model | 2900D |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 50780 MB |
