Yokogawa EXA PH202 2-Wire pH/ORP Analyzer User Manual
Page 115
IM 12B07D02-01E
Appendix 12-3
3/3
QIS 12B07D02-01E
Table 3
Check Point (pH)
Simulation Input (mV)
Data Display (pH)
0 +414.1
0.00
±0.01
7 0.0
7.00
±0.01
14 -414.1
14.00
±0.01
3.5 ORP
Indication
Check
Following Section 3.5, press the [ENT] key. The message display shows “ORP.INP.” In this state,
change the simulation input as shown in Table 4 by means of the standard voltage/current source
and check the data display. The corresponding value on the data display must be within the
range shown in Table 4.
Table 4
Simulation Input (mV)
Data Display (mV)
-1500
-1500
±1
0 0
±1
+1500
+1500
±1
Press the [ENT] key until the message display shows “READY.”
Press the [ENT] key again to end the tests.
Figure 1 Testing Circuit and Test Equipment
DC source
24 V DC
Standard
Voltage Source
+
300 :
+
-
-
DC
Milli-
ammeter
Ground
-
+
Shorting bar
Decade
Resistance
Box
PH202G, PH202SJ
SUPPLY
TEMP
INPUT 2
INPUT 1
LE
LOW IMP HIGH IMP
+
-
G 11 12
14
17
13
15
16