Levelcom 100 - Page 88

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configured as a passive gauge and will not apply any air to the sense line. This configuration

prevents the two machines from interfering with each other. To activate this item press the

MENU key and an asterisk will appear in the right most character in the display. If the item is

already activated and the operator wishes to de-activate the item, press the MENU key and

the asterisk will disappear. Press Enter to save this selection.

SAMPLE TIMING: This parameter is used to set the time the machine waits after putting a

charge of air on the line to take a sample of the line pressure. When using longer sense

lines this waiting time must be increased.

Press ENTER to view the current value. When you are viewing the parameter you can use

the UP and DOWN keys to change the value. When the desired value is shown on the

display press ENTER to save the new value.

This timing parameter does not have units, however a larger value of the timing parameter

results in longer delay times in sampling. Lengths of up to 600 feet of poly tubing have been

tested and below are suggested timing parameter values. You should only set the timing

parameter large enough to get correct operation. You don’t want to unnecessarily slow the

machine’s operation.

Timing parameter values for different lengths of ¼ inch poly tubing

100 feet 1

200 feet 3

300 feet 7

400 feet 10

500 feet 14

600 feet 18

You can tell if the timing parameter is too small by watching the machine sample the sense

line. The machine will put two or three charges of air on the sense line in a normal sample

operation. If the readings are not consistent between these charges of air the machine will

put a larger charge of air on the line which you can hear. After all charges of air the display

is updated. You can see the measured depth rise when the machine samples, and after the

sample operation is complete the depth will settle back to down to a lower value.

When the larger blast of air is triggered on every sample operation, and especially if the

measured depth changes much during the sample operation, the machine will eventually

indicate a leak.

Once the timing parameter is set up correctly the leak detection logic functions correctly, and

if the machine still indicates a leak condition there is probably a real leak in the sense line.

The above timing parameter values were derived from tests at TMS. Different sense line

materials have different effects on timing. For instance a LevelCom 100 will function