Thermo Fisher Scientific Alpha pH 500 - Manual (Page 21)

17
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
6.4 HOLD Current Setting
When Transmitter is in CAL or SETUP modes, it automatically
goes into a „HOLD‟ mode.
To indicate Transmitter is in „HOLD‟ mode, output current can be
set to 22 mA output by activating the „HLD On‟.
1. Press ENT key and use ▲ or ▼ keys to scroll till LCD
displays „SEt‟ in the upper display; and „HLd‟ in the
lower display. Press ENT again.
2. Upper display now shows „HLd‟. Lower display will
show either „OFF‟ or „On‟. Use ▲ or ▼ keys to toggle
between „On‟ of „OFF‟. Press ENT to accept selection.
3. Press  and  keys together, to return to MEAS
mode.
NOTE: If „HLd‟ is set to „OFF‟, then current output will be
equivalent to last measured value.
6.5 Out-of-Range Current Setting
If pH or ORP readings exceed the scale, LCD displays „Or‟ (over-
range), or „Ur‟ (under-range). Transmitter current output can be
set to 3.8 mA to indicate Out-of Range situation.
1. Press ENT key and use ▲ or ▼ keys to scroll till LCD
displays „SEt‟ in the upper display; and „org‟ in the lower
display. Press ENT again.
2. Upper display now shows „org‟. Lower display will show
either „OFF‟ or „On‟. Use ▲ or ▼ keys to toggle
between „On‟ of „OFF‟. Press ENT to accept selection.
3. Press  and  keys together, to return to MEAS mode.
NOTE: If „org‟ is set to „OFF‟, under-range will be set at 4 mA,
while over-range will be set at 20 mA.
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD