NOTE
: If using a combination
electrode with a BNC
connector, the reference
electrode input
(2)
is
not used.
3.
Attach ATC probe with DIN
connector by sliding the DIN
connectors into the ATC probe
input (
3
) until firmly in place.
pH Measurement
Overview
pH measurement is easy and
accurate with the Orion 920Aplus. The meter/electrode system is calibrated with
one to five buffers which bracket your sample pH. For better accuracy, at least a
two buffer calibration is recommended.
The autocalibration feature automatically recognizes 1.68, 4.01, 7.00, 10.01, and
12.46 buffers. For best results, an ATC probe is recommended to compensate for
temperature variation.
ISE Measurement Overview
Direct measurement using ion selective electrodes (ISE’s) is fast and convenient
with the Orion 920Aplus. The meter/electrode system is calibrated with one to
five standards of known concentration which bracket sample concentration.
Unknown sample concentration is then read directly from the display in units used
for calibration molarity, ppm, %, etc. See the appropriate electrode instruction
manual for preparation of sensing and reference electrodes, required solutions
(ionic strength adjusters, standards, etc.)and other special requirements. For best
results during calibration, always use the most dilute standard first, and always
use a fresh aliquot of standard.
Rec. Gnd. ATC/DIN KF Input 1 Ref.1 Input 2 Ref. 2
3
1
2
BNC Shorting Cap
Quick Start Guide
Orion 920Aplus pH/ISE Meter
All meter functions are described in detail in the accompanying instruction
manual. For calibration and measurement only a few steps are required,
and step-by-step instructions are given in this guide.
Meter Overview
1.
Results and current mode are displayed in the large main field.
2.
Channel, electrode ID, ready, and step-by-step prompts are displayed on the
lower, prompt display.
3.
The keys on the keypad have multiple functions. Their main function is to
enter numeric values. They also have primary functions. These are labeled
in white and are accessed by pressing
1st
then the function. Most keys also
have secondary functions. These are labeled in green, and are accessed by
pressing
2nd
then the function.
4.
If you want to escape the sequence you are in or are not sure of which
function you are in, pressing
1st
and then
measure
will take you to the
MEASURE mode where you can start again.
Meter Connections
Power
1.
Plug line adapter into an appropriate wall outlet.
2.
Plug line adapter firmly into power input on rear panel of meter.
Electrode Connections
1.
Remove BNC shorting cap.
2.
Attach electrode with BNC connector by sliding BNC connector onto
electrode input (
1
), then push down and turn clockwise to lock into position.
