Metrohm 773 pH/mV Simulator User Manual
Page 12
2.8. Checking the 617 and 679 Rancimats
773 pH/mV Simulator
10
2.8 Checking the 617 and 679 Rancimats
The measurement of the conductivity and the presentation on the
printer can be checked channel by channel. The conductivity is read
off from the display.
The temperature of the heating block is not important. It may be
necessary to create the starting condition (for 679 T> 50 °C).
773 pH/mV Simulator
x100
x10
x1
-
-
14,3k
PT1000
PT100
RE
WE
WE
ON/OFF
pH
U/mV
-
+
20
6
4
2
18
16
14
12
10
8
0
+
+
0
20
25 40 60
80
100
C
1000
~0,002
pH=7
U=0mV
i
R /M
1. Connect the socket "14.3 k
Ω
" of the 773 pH/mV Simulator with
the measuring input of the Rancimat with the 6.2150.010 Cable.
2. Note the cell constant and the printer settings. Set the cell con-
stant to 1 and make the following printer settings:
cond.range
20 uS/cm
paper feed
20 cm/h
Press
3. The measured value should be approx. 70 uS (exact value in the
table - field R-Test / G).
Allow each channel to print out 2-3 times.
4. When the printer is not printing out an active channel make the
following connections:
773 pH/mV Simulator
x100
x10
x1
-
-
14,3k
PT1000
PT100
RE
WE
WE
ON/OFF
pH
U/mV
-
+
20
6
4
2
18
16
14
12
10
8
0
+
+
0
20
25 40 60
80
100
C
1000
~0,002
pH=7
U=0mV
i
R /M
The measured value should be approx. 65 uS (exact value in the
table - field Add.data / green).
Allow each channel to print out 2-3 times again.
5. Repeat steps 3 and 4 for all channels.
6. Measure the alteration in conductivity in the Rancimat printout.
7. Reset the actual values for the cell constant and printer settings
on the Rancimat.
6.2150.010 Cable
6.2150.010 Cable