Instrument Test Procedure
1.
Switch on by pressing the I/O key. (Temperature probe should be disconnected.
2.
Press the Mode key to select pH mode
3.
Connect the BNC shorting plug to the pH input. The displayed reading should
read 7.00 ±0.02pH
4.
Select mV mode by pressing the Mode key. Display should read 0.0 ±0.2mV
5.
Select °C by pressing the Mode key. Ensure that the display has a value in the
range 0.0 to 19.0°C and is adjustable. i.e. responds to the use of the òñ keys.
Adjust to 20.0°C
6.
The meter is ready for calibration
A Note on Electrodes
pH, Ion Selective and Redox electrodes may all be used with the FE257.
These may be combination or half-cell types. Combination or sensing half-cells
should have a BNC terminal and be connected to the socket marked pH/ION
input at the back of the meter.
Reference half-cells should have a 4mm bunched terminal and be connected to
the socket marked REF. Always refer to electrode instructions before use. See
also, Appendix 1.
