Thermo Orion 420Aplus Quick Start Manual

Quick Start Guide
All meter functions are described in detail in the accompanying instruction
manual. For calibration and measurement only, a few steps are required.
Step-by-step instructions are given in this guide.

Meter Overview

1. Results are displayed in the large main field of the display.
2. Mode is indicated by ▼ along the bottom of the display corresponding to the
legend below it.
3. Some of the keys on the keypad have multiple functions. Their primary
functions are labeled in white. For those with secondary functions, these
functions are labeled in green, and are accessed by pressing 2nd then the
function.
4. The parameters in the setup menu are preset to typical values and usually
do not require changing. Please see instruction manual if changing
parameters is necessary.
5. If you want to escape the sequence you are in, or you are not sure of which
function you are in, pressing 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.
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 connector into the
ATC probe input (3) until firmly in place.

pH Measurement Overview

pH measurement is easy and accurate with the Orion 420Aplus. The
meter/electrode system is calibrated with one to three buffers that bracket your
sample pH.
Orion 420Aplus pH Meter
ower
9V DC ATC/DIN Ref. Input
3
1
2
BNC
Shorting Cap