Bar Graph; Program Controller - Thermo Scientific CRYO Plus 1 Operating And Maintenance Manual

Section 2
Operation

Bar Graph

Located on the front of the CryoPlus cabinet, the tri-color, 24 light bar
graph displays the liquid level inside the chamber, and (start fill) low level
and (stop fill) high level setpoints (Figure 2-2).
A Scale Select button at the base of the bar graph toggles the scale between
the high (liquid phase) and low (vapor phase) scales. Refer to Figure 2-2.
Numbers in parenthesis are the metric equivalents.
The left side scale is for settings from 1-inch to 25-inches in 1 inch
increments.
The right side scale is for settings from 2-inches to 7-inches in 1/4"
increments (vapor scale). The three light bars at the top of the level panel
are visible alarm lights that coincide with the alarms indicated on the top
control panel on the lid.
The three colors of the bar graph (Figure 2-3) are:
Orange (steady) indicates the remaining space
above the high level setpoint.
Orange (flashing): Under normal conditions,
the flashing upper LED is the high level (stop
fill) setpoint, and the flashing lower LED is the
low level (start fill) setpoint.
Green indicates the actual liquid Nitrogen
level.
Red (steady) indicates the amount of space
below or above setpoint from the actual liquid
level.
Red (flashing) indicates that the liquid level
Figure 2-3. Bar Graph Colors
is above or below the level set points. A
possible alarm condition is pending.
Single Red (flashing) after a fill operation indicates that the liquid level is
at the high level setpoint. This is not an alarm condition.

Program Controller

Caution The Key Switch must be in the Programming Access (.) position
to program the controller or to access any Touch Pad function. The
Controller will automatically return to the lock position, even though the
key is in the Access (.) Position, if no entry is made on the key pad within
four (4) minutes. On the high scale (left side, 2"- 25"), the high and low
level setpoints must be at least 3" apart. On the low scale (right side, 1.5"-
7.25"), the high and low level setpoints must be at least 1.25" apart. ▲
Thermo Scientific 7007400 Cryoplus 2-3