Operation As A Simulator; Prepare A Ph Analyzer For Testing; Prepare For Ph Simulation; (Ph Output Only) - Fig. 4.1 - ABB 2410 Instruction Manual

4 OPERATION AS A SIMULATOR

4.1 Prepare a pH Analyzer
for Testing
a) Ensure that the pH analyzer to be tested is
correctly earthed through its power supply
earth lead (where applicable), then switch
on the power supply (it may be necessary
to allow some older types of analyzer to
warm up).
b) Set the pH analyzer under test to the
CHECK position (where applicable) and
disconnect the electrodes from the input
terminals (refer to the relevant instruction
manual).
c) Connect a suitable lead from the input
terminals of the pH analyzer to the Model
2410's BNC connector. If using a lead with
tag terminations, connect the core (white)
to the glass electrode terminal and the
screen (black) to the reference terminal.
d)
Manual temperature compensation
temperature control on the pH analyzer
under test to that of the ambient
temperature.
Automatic temperature compensation
connect a suitable decade resistance box
to the analyzer under test in place of the
temperature compensator.
resistance box to the value equivalent to
one of the temperatures in Table 4.1, e.g.
10°C, 20°C etc.
e) If testing a pH analyzer with differential
amplifier (e.g. Models 9180 or 4530/40),
connect the earth socket on the Model
2410 (see Fig. 3.1) to the pH analyzer
solution earth terminal using the earth wire
supplied.

4.2 Prepare for pH Simulation

(pH output only) – Fig. 4.1
Before using the 2410 as a pH simulator it is
necessary to standardise the output for
correct pH units with respect to the voltage
(mV) output.
Set the 'Temp °C' control to 25°C.
1
Set the Function switch to 'CALIBRATE'.
2
Set the Power switch to 'ON'.
3
Set the Mode switch to 'mV' and use the
4
'OUTPUT ADJUST' control to set '000' on
the display.
Set the Mode switch to 'pH'.
5
Adjust the 'CALIB' control to set '7.00' on
6
the display.
Set the Mode switch to 'mV' and use the
7
'OUTPUT ADJUST' control to set '177' on
the display.
Set the Mode switch to 'pH'.
8
Adjust the 'SLOPE' control to set '4.00' on
9
the display.
The simulator can now be used in either the
– set the
'pH' or 'mV' output modes.
Note. If the 2410 is always used as
a simulator, the above procedure
need only be carried out once,
–
unless the control settings are
disturbed.
Set the
9
Fig. 4.1 Preparation for pH Simulation
1
TEMP
C
40 60
25
80
20
0 100
CALIB
SLOPE
ON OFF
Temp mV pH
3
4 7 5 8
4
OUTPUT
7
ADJUST
1000M
100k
CALIBRATE
MEASURE
2
TEMP
6
3