S y fle, Al.c – Thermo Fisher Scientific Alpha DO 1000 User Manual

Page 35

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.”.

AL.C = alarm contact

StdY = steady contact

FLEt = fleeting (single pulse) contact

HOLD

SETUP

Al.

HOLD

SETUP

S Y

FLE

Al.C

HOLD

mg/l

SETUP

ppm