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-4-
iO.0
buffer solution.
to the user.
pH
or a
adjustment.when
the probe is in a
The choice of a 4.0 or 10.0 is up
4.0
pH
buffer solution
"pH
CAL" with the
for a reading of 7.0 and the "Slope"
probe in a 7.0
pH
value of the buffer solution.
2.2
Probe standardization
is accomplished by adjusting
II-31
of this manual and placing the
sensor in a known buffer solution and turning the power on.
The display
should indicate the
pH
units.
2.
Operation
2.1
Initialization
of the transmitter consists of making the connections
described in the wiring (section
#3
is added
for a full scale output of 1 to 2
pH
units.
Jumper
#2
is located in the third pair of pads, it may
be added
to obtain a full scale output of 2 to 6
pH
units.
Jumper
jumper
is for full scale output currents of 6
to 14
top,
and this
pads
second
from the
#l
is located in the pair of
pH
level,
it is used in conjunction with the range switch.
The "Span" pot affects
the output current level only. There is interaction between the "Zero"
and
"Span" pots.
Range
jumpers are located on the output board.
These jumpers allow the
user to increase the sensitivity of the output. There are 4 jumper pairs
of pads,
the uppermost position is not used; there are no traces connected
to this pair of pads.
Jumper
mA
output current level for the desired
pH
level,
it is used in conjunction with the range switch.
The “Zero" pot affects
the output current only.
There is interaction between the "Zero" and
"Span" pots.
"SPAN"
potentiometer is a gain adjustment on the output board.
This
adjustment sets the 20
mA output current level for the desired
pH
readout only.
"ZERO" potentiometer is an offset adjustment on the output board.
This
adjustment sets the 4
"R19"
potentiometer is a gain adjustment on the output circuit board.
This adjustment is factory set and should not need adjustment in the
field, it affects the displayed
pH
probe on the
input circuit board.
This adjustment allows standardization of different
probes, it affects the displayed readout and the output current.
"Slope" potentiometer is a gain adjustment on the input circuit board.
This adjustment is used to standardize the readings for probes with less
than 100% efficiency,
it affects the displayed readout and the output
current.
"pH
CAL" potentiometer is an offset adjustment for the
mA.
mA
to 20.0
mA,
normally 4.0
pH
when the switch is in the relaxed position.
When the switch is pressed and held, the display will indicate the output
current to
pH
to 14.00
mA"
on the cover.
The display will
indicate 0.00
1abeled"Press
for
&
TECHNICAL INFORMATION
1.
Controls
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Display
switch is
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OPERATING INSTRUCTIONS PART III