Lakeshore Learning Materials 622 - Manual (Page 72)

Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual
Options & Accessories 6-4
6.2.5 LHe Level
Access liquid helium level and field monitoring from
the MPS front panel. Press Function Menu and
then Next Menu to display Function Menu 2. If the
Model 6226/6476 Option is not present, <NP>
appears next to LHe LEVEL and FIELD and
associated function keys are ignored.
6.2.5.1 LHe Level Operation
Press the LHe LEVEL Function key to display the
Liquid Helium Level screen. The Menu window
returns to display Output values.
The cursor up and down keys move the line
indicator. The ¥ icon indicates parameters changed
only with the Data Entry up and down arrows. When
there are <ON> or <OFF> indicators, the Data Entry
up and down arrows change the status if they are the first data entry keys used.
READING: <OFF> or <ON>
Level Reading Status. The Data Entry up or down arrow initiates a level reading.
UNITS: in. (E), %, or cm (M)
Level Units. The Data Entry up or down arrow scrolls through the available units: inches (English), %
(percent), or centimeters (Metric).
NEXT RDG: 00:00 (Time in Hours:Minutes)
The Time to Next Reading.
PERIOD: 00:00 (Time in Hours:Minutes)
Level Sample Period. A time of 00:00 indicates a continuous reading (20 second period, 5 seconds for level
reading). Use any numeric entry mode to change the value. Period limit is 23:59.
ALARM: + 0.0 (Reading) and <OFF> or <ON>
Level Alarm and Alarm Status. The Data Entry up or down arrow toggles the status. Use any numeric entry
mode to change the value.
ZERO REF: + 0.0 (Reading) and <OFF> or <ON>
Level Zero Reference Value and Status. The Data Entry up or down arrow toggles the status. When ON, the
value entered is the zero reference reading which the software subtracts from the actual level reading to give a
“relative” level reading. Use any numeric entry mode to change the value.
CALIBRATE SENSOR
Change level sensor length, units, and calibration from this screen. The Data Entry up or down arrow displays
the Level Calibration screen.
If the level alarm is on and the MPS detects that the
level alarm has been reached, the MPS closes the
FLT contacts to indicate the fault, sounds an alarm
about once per second, and displays the screen to
the right. The alarm continues to sound until the
level alarm is turned off. When the alarm is turned
off (or disabled), the MPS opens the FLT contacts
and turns off the alarm.
2/3
OUTPUTS ONLY
LHe LEVEL
FIELD
PSH SETUP
L I Q U I D H E L I U M L E V E L :
¤ R E A D I N G
U N I T S
N E X T R D G
P E R I O D
A L A R M
Z E R O R E F
C A L I B R A T E S E N S O R
O U T P U T S : *
+1.999A : < O F F >
: i n ( E )
: 0 0 : 1 6
: 0 1 : 0 0
: + 1 4 . 5 < O N >
: + 0 . 0 < O F F >
¥
¥
¥
¥
¥
L V L : + 1 4 . 4 i n
F L D : + 6 3 . 4 8 k G
+ 0 . 0 0 1 V
L I Q U I D H E L I U M L E V E L :
¤ R E A D I N G
U N I T S
N E X T R D G
P E R I O D
A L A R M
Z E R O R E F
C A L I B R A T E S E N S O R
O U T P U T S : *
+1.999A : < O F F >
: i n ( E )
: 0 0 : 1 6
: 0 1 : 0 0
: + 1 4 . 5 < O N >
: + 0 . 0 < O F F >
¥
¥
¥
¥
¥
L V L : + 1 4 . 4 i n
F L D : + 6 3 . 4 8 k G
+ 0 . 0 0 1 V
* * L E V E L A L A R M * *