User Guide

Instruction Manual pH 500
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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 S and T 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 S and T 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