NorthStar Echo Sounder 491 Operation Manual page 65

Setting the upper
and lower
temperature limits
Setting inside or
outside
temperature limits
Turning the
temperature alarm
on and off
491 Echo Sounder Operations Manual
You can set the upper and lower temperature limits. When the
water temperature is either inside or outside these limits, the
temperature alarm will sound.
To set the upper temperature limit:
1. At the TEMPERATURE ALARM window, press SET UPPER
LIMIT.
The upper limit window is highlighted in black.
2. Press the CURSOR PAD up or down to set the
temperature, or use the KEYPAD to manually enter the
desired temperature.
The temperature is displayed in the tab just below the
SET UPPER LIMIT key.
To set the lower temperature limit:
1. At the TEMPERATURE ALARM window, press SET
LOWER LIMIT.
The lower limit window is highlighted in black.
2. Press the CURSOR PAD up or down to set the
temperature, or use the KEYPAD to enter the desired
temperature.
The temperature is displayed in the tab just below the
SET LOWER LIMIT key.
If you set the upper and lower temperature limits as inside
limits, the temperature alarm sounds when the temperature is
detected within these limits. If you set these limits as outside
limits, the temperature alarm sounds when the temperature is
detected outside of these limits.
Press INSIDE/OUTSIDE LIMITS on the TEMPERATURE ALARM
window to switch between the inside and outside settings. The
current setting is displayed in the tab just below the INSIDE/
OUTSIDE LIMITS key.
To turn the alarm on, at the TEMPERATURE ALARM window,
press TURN ALARM ON. To turn the alarm off, press TURN
ALARM OFF.
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