Teledyne 7600, Operating Instructions Manual

Page: 54 / 126

Operation Model 7600
Teledyne Analytical Instruments
54
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High Limit: sets the upper value (concentration) above which
the alarm will trigger. Has an on-screen display.
•
Low Limit: sets a lower value (concentration) below which
the alarm will trigger. Has an on-screen display
•
High or Low Limit: triggers an alarm when the concentration
is above the high limit or below the low limit.
•
High-High: sets the upper value (concentration) above which
the alarm will trigger.
•
Low-Low: sets a lower value (concentration) below which
the alarm will trigger.
•
Power Failure: (Alarm 6 only) normally closed contacts open
when power is removed.
Configuring the alarms involves:
•
Selecting the alarm type
•
Assigning it to a channel
•
Establishing setpoints (concentration alarms only)
•
Enabling or disabling it
A channel can be configured for multiple alarms.
ON/OFF enables the alarm function if set at ON, or disables the
alarm function if set at OFF. The H-limit value cannot be set below the
L-limit value, and the L-limit value cannot be set above the H-limit
value.
If it is desired to set the H-limit value below the L-limit value
already stored in the memory, reduce the L-limit value beforehand, and
vice versa.
A typical on-screen display for a High alarm is shown below.
When the H-limit alarm occurs, the “H-alarm” message comes on
in the field of relevant channel. Similarly for L-alarm. There is no screen
display for the HH-alarm”, and “LL-alarm” but otherwise, they function
like the H and L limit alarms.