Section 7
Concentration
Please refer to page 9 before proceeding.
The following can only be carried out if the instrument has not
been calibrated in Conductivity Mode.
Calibration and Measurement
0
Prepare up to four calibration solutions, each with a known
@
©
0
0
concentration
Connect cell and select concentration mode
Place cell in first standard and wait for a stable reading. The
./J. key can be used to adjust the value to the correct decade
of concentration. The exact value may then be entered by
adjusting the reading using the ./J. fr keys, (CAL flag will
flash). And then pressing Enter. (CAL flag will stop flash
ing).
Repeat © for each standard.
Place cell in sample and read concentration.
The calibration points may be inspected at any time as follows:
G)
Press CHK
(JJ
First a number identifier is displayed and then the standard
value.
@
This is repeated for each standard.
©
Return to the function you require by pressing the Mode
key.
To Back off the background conductivity
Follow points Oto 0
0
Place cell in background sample and enter 0.00
@
Place cell in sample and read concentration
13
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____
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Section 8
Use of the Recorder Output
Refer to the recorder instructions
0
Connect the recorder via the red and black 4mm sockets on
the back panel. (Red positive, Black negative)
Ensure that the recorder is set for the appropriate range, i.e.
Mode
Range
Display
Recorder
Cond
0-200 l000µS/cm l00mV
TDS
0-200
666mg/L
66.6mV
Res
0-200
IO.OMO.cm 10.0mV
Sal
0-200
35.0
35.0mV
oc
±200
25.0
°
C
25.0mV
Range Hold
The auto-ranging facility on the RE3 88Tx selects the most appro
priate range for the current reading automatically.
To disable the auto- ranging facility
0
Place cell in the sample and select the required mode.
@
Press the Send key followed by the Enter key.
©
The range currently in use is now held.
0
To disable range hold press Clear key
0
Exit Hold facility by pressing the Send key.
14
