Sensaphone 1800 - Manual (Page 47)

Chapter 4: Zone Programming
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4. Using the number keys, enter a value. Then press ENTER.
To program the High Alarm Limit:
1) Press the SET key.
2) Press the HIGH LIMIT key.
3) Press the corresponding Zone key (1-8), 1800 will say “Enter
number.”
4. Using the number keys, enter a value. Then press ENTER.