Thermo Scientific Alpha DO 1000, Руководство пользователя, Страница: 35 / 48

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7.8.2 Selecting the Units Of Measure (mg/l, ppm or %)
The reading displayed on the LCD in the controller can be
displayed in mg/l, ppm or in terms of % saturation.
1. Follow directions in 7.8.1 to enter Configuration mode.
2. Press the ENTER key. The upper display shows
“Unit” and the lower display shows “dO”. By pressing
the
▲
or
▼
keys, the units on the right of the upper
display, toggles between the flashing “mg/l”; “ppm”;
or “%”.
3. After selecting the relevant units of measure, press
the ENTER key to accept the selection.
4. Proceed to 7.8.3, or return to Measurement mode by
pressing the
▲
or
▼
keys simultaneously (escape).
7.8.3 Selecting the Alarm Time Lag
This parameter group lets you select a period of time before the alarm activates
when your set point has been overshot. You can select from 0 to 1999 seconds.
1. Follow directions in 7.8.1 to enter Configuration mode.
2. Press the ENTER key. Scroll with the
▲
or
▼
keys until the upper display shows a numerical
value (in seconds) and the lower display shows
“AL.d”.
3. Press the
▲
or
▼
keys to select how long of an
alarm delay (0 to 1999 seconds) you want.
4. Press the ENTER key to confirm your selection.
5. Proceed to 7.8.4, or return to Measurement mode by pressing the
▲
or
▼
keys simultaneously (escape).
7.8.4 Selecting Steady or Pulse Contact for the Alarm Relay
This parameter group lets you select whether the alarm
contact will operate as a steady contact or a fleeting (single
pulse) contact. Pulse contact closing time is 250 millisecond.
1. Follow directions in 7.8.1 to enter Configuration
mode.
2. Press the ENTER key. Scroll with the
▲
or
▼
keys
until the upper display shows “Stdy” or “FLEt” and
lower display shows “AL.C.”.
ƒ
AL.C = alarm contact
ƒ
StdY = steady contact
ƒ
FLEt = fleeting (single pulse) contact
HOLD SETUP
30
Al.
HOLD
HOLD
SETUP
SETUP
S Y
FLE
Al.C
Al.C
HOLD
HOLD
HOLD
mg/l
%
SETUP
SETUP
SETUP
u
u
u
o
o
o
ppm