Yokogawa EXA SC202 2-Wire Conductivity Transmitter/Analyzer - Manual (Page 89)

IM 12D08B02-01E
Appendix 3-1
13. APPENDIX 3 QUALITY INSPECTION
13-1. SC202G 2-Wire Conductivity Transmitter
Quality
Inspection
Standards
SC202G, SC202SJ
2-Wire Conductivity Transmitter
QIS 12D08B02-01E
1st Edition: Feb. 2001(YK)
6th Edition: Mar. 2007(YK)
1. Scope
This inspection standard applies to the SC202/SC202SJ 2-Wire Conductivity Transmitter.
2. Inspection Items
2.1 Insulation resistance test
2.2 Current output test
2.3 Temperature indication check
2.4 Resistance (conductivity) check
3. Inspection Methods, Standards and Conditions
z
Connect the testing circuit as shown in Figure 1. Allow the instrument to warm up for at least
5 minutes before conducting the tests. For the connections for the insulation resistance test,
follow the instructions in Section 3.1.
z
Performance tests should be done in the inspection mode where the tests from Section 3.2
through Section 3.4 take place in sequence and cannot be retraced. If the reconfirmation of
a test is needed, turn off the power to the transmitter, turn on the power again, and enter the
inspection mode to restart the tests.
z
Set the equipment as follows.
Decade resistance box 1 (temperature): 960.9 :
Decade resistance box 2 (conductivity): 10 :
DC source: 24 VDC
3.1 Insulation Resistance Test
As for the PH202G, follow the instructions below.
(1) Apply 500 V DC between the power supply terminals shorted together (+ and –) and the
earth terminal (G). The insulation resistance must be 100 MΩ or greater.
(2) Apply 500 V DC between the input terminals shorted together (11 to 16) and the earth
terminal (G). The insulation resistance must be 100 MΩ or greater.
As for the PH202SJ, follow the instructions below.
(1) Apply 125 V DC between the power supply terminals shorted together (+ and –) and the
earth terminal (G). The insulation resistance must be 9.5 MΩ or greater.
(2) Apply 125 V DC between the input terminals shorted together (11 to 16) and the earth
terminal (G). The insulation resistance must be 100 MΩ or greater.
3.2 Current Output Test
<Test>
(1) Enter Service Code 87 and then password 070.
(2) When the message display shows “*HIF”, press the [YES] key.
(3) Press the [ENT] key. (The date in day-month-year (last 2 digits) order will appear.)
(4) Press the [ENT] key. (The time in hour-minute-second order will appear.)
(5) Press the [ENT] key.
(6) When the message display shows “4 (mA),” the output current must be within the range
shown in Table 1.
(7) After confirmation, press the [ENT] key.
(8) To skip the current output if not needed to be checked, just press the [ENT] key.