Thermo Scientific Orion 720Aplus - User Manual

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 connectors into the ATC probe input (3) until
firmly in place.
pH Measurement Overview
pH measurement is easy and accurate with the Orion 720Aplus. 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 720Aplus. 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.
Rec. Gnd. ATC/DIN KF Input 1 Ref.1 Input 2 Ref. 2
3
1
2
BNC Shorting Cap
Quick Start Guide
Orion 720Aplus 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.
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, 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 can be accessed by
pressing 2nd, then the function.
4. If you want to escape the sequence you are in, or your 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.

Summary

Meter Overview

Keypad and Navigation

Details on keypad functions, primary/secondary key access, and escaping sequences.

Meter Connections

Power Connection

Instructions for connecting the line adapter to the meter's power input.

Electrode Connections

Connecting Electrodes

Steps for attaching BNC and ATC probes to the meter inputs.

pH Measurement

pH Measurement Overview

Overview of pH measurement accuracy, calibration, and ATC probe recommendation.

ISE Measurement

ISE Measurement Overview

Overview of direct ISE measurement, calibration, and concentration units.

pH Autocalibration

pH Autocalibration with Two Buffers

Step-by-step guide for performing a two-buffer pH autocalibration.

Ion-Selective Electrode Calibration

Calibration of Ion-Selective Electrodes (ISE) with Two Standards

Step-by-step guide for calibrating ISEs using two standards.

Thermo Scientific Orion 720Aplus Specifications

General

Type	pH/mV/Temperature Meter
pH Range	-2.00 to 19.99 pH
pH Resolution	0.01 pH
pH Accuracy	±0.01 pH
mV Resolution	0.1 mV
mV Accuracy	±0.2 mV
Temperature Range	-5.0 to 105.0 °C
Temperature Resolution	0.1 °C
Temperature Accuracy	±0.5 °C
Temperature Compensation	Automatic or manual
Calibration Points	Up to 5 points
Display	LCD
Outputs	RS232
mV Range	±2000 mV
Power Supply	AC adapter or batteries