Thermo 3307, Руководство по эксплуатации и техническому обслуживанию

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9 - 2
To install the analog board:
1. Turn the incubator Off and disconnect it from the power
source.
2. Remove the two screws from the bottom of the left side
panel to access the electronics area. Using the handle
provided, lift the side panel up and out.
3. On the left side of the opening is the electronics area.
Locate the Analog Output board.
4. Each system monitored (Temp, CO
2
, RH) requires two
conductors (Refer to Figure 9-4).
5. Feed the wires through the
auxiliary wire through-port
(Figure 9-5) on the back panel.
This port is a circular fitting
adjacent to the remote alarm
and RS485 connectors.
6. Strip the ends of each conduc-
tor and wire it to the appropri-
ate terminals of connectors J2
and/or J3 on the analog board.
(Refer to Figure 9-4)
7. When wiring is completed, install the side panel and
secure with the screws. Return the unit to service.
9.2 CO
2
Gas Guard (1900153)
CO
2
can be lethal in high concentrations. Refer to
warnings in Section 1.5k of this manual.
The Steri-Cult incubators can be equipped with a built-in
Gas Guard system that will operate with a CO
2
gas supply. The
Gas Guard uses two pressure switches to continuously monitor
the pressures of two independent CO
2
supplies and automatical-
ly switches from one supply to the other when the supply pres-
sure drops below 10 psig (0.690 bar). The Gas Guard’s design
does not facilitate use by multiple incubators.
The CO
2
gas supplies must be equipped with two-stage
pressure regulators with gauges. The high pressure gauge at the
tank should have a 0-2000 psig range and the low pressure
gauge should have a 0-30 psig range. The gas supply to the
incubator must be maintained at 15 psig (1.034 bar). Gas pres-
sures below 15 psig will cause nuisance alarms to occur on
incubators equipped with the built-in Gas Guard.
a. Connecting the CO
2
Gas Supplies
The CO
2
inlets for the Gas Guard are locat-
ed on the back of the cabinet. Using 1/4” ID
tubing, connect one of the CO
2
supply tanks to
the fitting labeled CO2 Inlet #1 Tank. Connect
the second CO
2
supply tank to the fitting
labeled CO2 Inlet #2 Tank. Install 3/8” hose
clamps to secure the 1/4” ID tubing to the fit-
tings on the cabinet back. (Refer to Figure 9-6.)
b. De-activating the Gas Guard
The built-in Gas Guard is turned ON when shipped from
the factory. In addition, the Tank Select for the Gas Guard is
specified as Tank 1 when shipped. Refer to Section 4,
Configuration, to de-activate the Gas Guard or change the Tank
Select from #1 to #2. If the Gas Guard system is de-activated,
the incubator functions normally by supplying CO
2
from the
supply tank connected to Inlet #1.
Steri-Cult Incubator ____________________________________________________________________Factory Options
Figure 9-4
Figure 9-5
Figure 9-6
Table 9-1, Analog Output Board Specifications
191761 4-20 mA
Output Scaling
4-20 mA Equals
191763 0-1V
Output Scaling
0-1 V Equals
191762 0-5V
Output Scaling
0-5V Equals
Temperature 12.5-162.5°C 0.0-150.0°C 0.0-150.0°C
RH 0-100 %RH 0-100 %RH 0-100 %RH
CO
2
0.0-100.0 %CO
2
0-100.0 %CO
2
0-100.0 %CO
2