Orion Benchtop pH/ISE Meter Instruction Manual
Overview of Meter Functions 520Aplus,525Aplus,720Aplus and 920Aplus
102
Key 1 Mode
Pressing mode (1) changes the instrument operating mode. The current
operating mode designation is displayed to the right of the main display.
Key 2 Calibrate
Pressing calibrate (2) starts a calibration. The time and date of the last
calibration are displayed, then the instrument starts the calibration
sequence. See the individual meter sections for instructions on calibration
and measurement.
Cal Edit (920Aplus only)
Pressing 2nd then cal edit(2) allows you to change or delete a calibration
point after the calibration has been completed. This is useful for multipoint
calibrations. See the Orion 920Aplus (special features) section for more
information.
Key 3 Measure
Pressing measure (3) returns the meter to measure mode for sample
analysis. While in measure mode, the sample temperature, ready, and hold
are displayed. The Orion 525Aplus, 720Aplus and 920Aplus include
channel designation. The 920Aplus also displays the electrode I.D.
When using hold, pressing measure will unlock hold for additional
sample analysis.
Stability (920Aplus only)
Pressing 2nd then stability (3) accesses the stability function on the
920Aplus. The main readout will display the absolute drift rate of the
electrode in mV/minute. The prompt line displays mV/min and a graphic
depiction of stability in the form of a bar. As the electrode becomes more
stable, more of the bar will be filled in. When the electrode reaches stability
READY replaces mV/min and the bar is completely filled.
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