Operating Manual
alpha DO 1000
25
7.7
Current Output (rng) sub-function
This sub-function lets you set the transmitter current output range of this unit. The
difference between the upper and lower range has to be a minimum of 20% in the
“%” mode or 2mg/l in the “mg/l” mode, anywhere on the scale. (Hence, if 4mA =
4mg/l or 20%, then the closest range for the the 20mA = 6mg/l or 40%).
7.7.1
Entering Current Output sub-function
1. Enter Advanced Set-up mode. Push the ENTER
key and scroll to Advanced Set-up security code
“22”. Push the ENTER key again.
2. Press
the
▲
or
▼
keys to scroll until the upper
display shows “rng”. Press ENTER.
7.7.2
Choosing the Output Type
This parameter lets you choose between 0-20 mA or 4-20
mA output.
1. Follow directions in 7.7.1 to enter Current Output
mode.
2. Press
the
▲
or
▼
keys to select your output type:
0 – 20 or 4 – 20 mA.
3. Press
the
ENTER
key to confirm your selection.
4. Proceed to 7.6.3, or return to Measurement mode
by pressing the
▲
and
▼
keys simultaneously
(escape).
7.7.3
Selecting Dissolved Oxygen Value at 0(4)mA
This parameter lets you choose the Dissolved Oxygen value at which the
transmitter output will be 0(4) mA.
1. Follow directions in 7.7.1 to enter Current Output mode.
2. Press
the
ENTER
key until the upper display shows a Dissolved Oxygen
value and the lower display shows “r.0(4)”.
3. Press
the
▲
or
▼
keys to select dissolved oxygen value to be equivalent
to 0(4) mA (Default is 2.00mg/l or 0%).
4. Press
the
ENTER
key to confirm your selection and proceed to 7.7.4 or
return to Measurement mode by pressing the
▲
and
▼
keys
simultaneously (escape).
HOLD
HOLD
HOLD
SETUP
SETUP
SETUP
2.00
8.00
4-20
.20
mg/l
mg/l
HOLD
SETUP