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Hach 900 User Manual

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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.