Teledyne 7600 - Infrared gas analyzer - operating manual - Manual (Page 54)

Operation Model 7600
Teledyne Analytical Instruments 54
• 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.