Hach SIGMA 900 - Manual (Page 27)

Section 4
Page 27
8544operations.fm Programming the Sampler for Level Control
4.9 Programming the Sampler for Level Control
Put the sampler in a standby state (i.e. "Program Halted", "Ready To Start" or
"Program Complete") hold
CLEAR ENTRY for two seconds. This will cause the
display to read " Level Control?". The following messages may be displayed in
the level control program:
Note: In addition to the liquid level actuator, a Multi-purpose Half cable (Cat. No. 941
or 541) may be used to connect the sampler to any controlling device which
produces a dry contact closure upon a predetermined conditions. For example, a
pH meter with adjustable high/low set points can be used to control sampler
operation in any of the three level/auxiliary control modes.
4.10 Other Displayed Messages
Item
Number
Message Description of Message
1 LEVEL CONTROL
If you press NO , SPECIAL OUTPUT? will appear on the display. If you press YES , the
display shows item 2.
2 LEVEL START?
If you press YES , the sampler operates as described in Mode 1. If you press NO , the
display shows item number 4.
3 LEVEL START/STOP
If you press YES, the sampler operates as described in Mode 2. If you press NO , the
display shows item number 5.
4 SAMPLE ON LEVEL?
If you press YES, the sampler operates as described in Mode 3. If you press NO , the
display shows item number 1.
Message Description of Message
YES/NO or * TO
BACKUP
This message appears if a key other than YES or NO is pressed and the displayed message is
followed by a question mark while in the Parameter Entry, Programming Running, or Time Set
modes.
WHILE RUNNING, KEY
0 - 1 - 2 ONLY
This message appears if a key other than 0 , 1 , or 2 is pressed while the program is running. The
program must be halted (press the 2 key) before any manual operations are performed, such as
Bottle Advance, Pump, Purge, Take Sample, New Program, etc.
REVIEW RESULTS?
This message appears if DISPLAY FEEDBACK is pressed and the sample program has been halted.
A YES response will cause the sample program results to appear. A NO response causes REVIEW
PROGRAM? to appear.
REVIEW PROGRAM?
If you press the YES key, all programmed settings will appear on the display. Pressing the NO key
will place the sampler back into the standby state.
LOW BATTERY This message indicates that the external battery is low and requires recharging.
MEMORY POWER LOW This message indicates that the internal lithium battery is low and needs to be replaced.
PROGRAM STOPPED
DUE TO FULL BOTTLE
During composite mode, this message appears upon a full bottle condition. The program cannot
be restarted until the composite container is emptied and the float switch is in the lowered position.
BOTTLE IS FULL
If your instrument is programmed for single container composite sampling, this message appears
if the
START PROGRAM key is pressed and the float switch is not in the lowered position. Because
the same circuit path is used for the composite full bottle float switch (composite mode) and
#1 bottle indicator (multiple bottle mode), this message will also appear if the
START PROGRAM key
is pressed with the sampler programmed for single container composite with the distributor
assembly in place, and the arm in the #1 bottle position. To correct this situation, remove the
distributor, install the composite container retainer, and press the
START PROGRAM key.
FULL BOTTLE or
PROGRAM HALTED
DUE TO FULL BOTTLE
The full bottle float switch is in the raised position due to a full composite container. To resume the
program, exchange the full container with an empty one. With the float switch in the lowered
position, the program will resume within one minute.