Section 4

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:

 

 

 

 

 

Item

 

Message

Description of Message

Number

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

Message

 

Description of Message

 

 

 

 

YES/NO or * TO

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

 

BACKUP

 

modes.

 

 

 

 

 

 

 

 

 

WHILE RUNNING, KEY

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

0 - 1 - 2 ONLY

Bottle Advance, Pump, Purge, Take Sample, New Program, etc.

 

 

 

 

 

 

 

 

 

 

This message appears if DISPLAY FEEDBACK is pressed and the sample program has been halted.

REVIEW RESULTS?

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

During composite mode, this message appears upon a full bottle condition. The program cannot

DUE TO FULL BOTTLE

be restarted until the composite container is emptied and the float switch is in the lowered position.

 

 

 

 

 

 

 

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

BOTTLE IS FULL

#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

The full bottle float switch is in the raised position due to a full composite container. To resume the

PROGRAM HALTED

program, exchange the full container with an empty one. With the float switch in the lowered

DUE TO FULL BOTTLE

position, the program will resume within one minute.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 27

8544operations.fm

 

Programming the Sampler for Level Control

Page 27
Image 27
Hach 900 manual Section Programming the Sampler for Level Control, Other Displayed Messages