Hach 900 User Manual

 

8544operations.fm

Indicates that a program is ready to start. To start, press 

.

Indicates the sampling program has been interrupted.

Indicates that a program is in process. Keys 

, 

 and 

 are the only active keys while a 

program is running. If running, halt the program (press 

) before entering 

a new program.

This message is displayed after program completion. To repeat the program, press 

. Press 

 to enter a different program.

When the sampler is on, this message will appear if the sampler was turned off during 
program entry.

This is the first message in the programming sequence. If selected, the sampler will 
start only after the delay period elapses. A 

 response causes message 6a to appear 

on the display.

A time and date are displayed when 

 is pressed in response to message 6. The 

example to the left signifies 10:35 in the morning, on October 24, 2000. 

If selected, the sampler will operate on a timed cycle basis. Press 

 to prompt the 

user to enter the number of minutes desired for the time interval between samples. 
Press 

 to prompt the question described in item 8.

Enter the value for the interval between samples (in minutes).

Press 

 the cause the sampler to operate on a flow proportional basis. It will prompt 

the you to enter the number of flow signals that you want the sampler to count down 
between samples. Press 

 to prompt the question in item 7.

Enter the value for the number of pulses (counts) that you want to accumulate between 
samples. To determine the appropriate number, refer to the programming instructions 
for flow proportional operation in 

Press 

 to retain the previously entered program entries for all remaining programming 

steps, and return to the "Ready to Start" standby state. Press 

 to change the 

previously programmed entries for all items 10 through 16.

This message appears if only one bottle is entered for the total number of bottles in the 
parameter entry mode. Press 

 to the "Continuous Mode?" prompt to take samples at 

the programmed interval. The program will terminate only with a full bottle when using 
the full bottle float switch (Cat. No. 8847). Press 

 to cause the display to read 

"samples = _ _ _". This permits you to enter the desired number of samples, after which 
the program will terminate.

Press 

 to retain the sample volume from the previous program (programming items 

13, a–h are skipped), and the display will prompt the message in item 14.

Enter the desired sample volume (in mL) to be delivered to the sample container each 
time a sample is initiated. 

This message appears after you enter sample volume. If greater volume accuracy is 
desired, press 

. Press 

to skip the calibration and go to the next step.

When 

 is pressed the sampler will pump to collect one sample. The pump will first 

pre-purge the intake line, draw sample liquid, and then post-purge.

Before pressing 

, pull the pump tubing off of the fitting where it enters the sampler 

housing and place a graduated cylinder at the sample discharge point.

After pressing 

 in response to item 13a, the pump will pre-purge the intake line and 

begin pumping liquid into the graduated container. When the desired volume has been 
delivered, press 

. The pump will then purge the intake tubing. The sampler 

will hold the time to deliver the desired sample volume in memory. This timed volume is 
repeated for subsequent samples.