Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 69)

IM 11M13A01-02E 3-18
3.6 Insulation Resistance Test
Even if the testing voltage is not so great that it causes dielectric breakdown, testing
may cause deterioration in insulation and a possible safety hazard. Therefore, conduct
this test only when it is necessary.
The applied voltage for this test shall be 500 V DC or less. The voltage shall be applied
for as short a time as practicable to confirm that insulation resistance is 20 M
⍀ or more.
Remove wiring from the converter and the detector.
1. Remove the jumper plate located between terminal G and the protective grounding
terminal.
2. Connect crossover wiring between L and N.
3. Connect an insulation resistance tester (with its power OFF). Connect (+) terminal to
the crossover wiring, and (-) terminal to ground.
4. Turn the insulation resistance tester ON and measure the insulation resistance.
5. After testing, remove the tester and connect a 100 k
⍀ resistance between the cross-
over wiring and ground, to discharge.
6. Testing between the heater terminal and ground, contact output terminal and ground,
analog output/input terminal and ground can be conducted in the same manner.
7. Although contact input terminals are isolated, insulation resistance test cannot be
conducted because the breakdown voltage of the surge-preventing arrester between
the terminal and ground is low.
8. After conducting all the tests, replace the jumper plate as it was.
1
FG
2
AO1
(+)
3
AO1
(-)
4
AO2
(+)
5
AO2
(-)
6
CJ
(+)
7
CJ
(-)
8
TC
(+)
9
TC
(-)
10
CELL
(+)
11
CELL
(-)
12
FG
13
DI-1
14
DI-2
15
DI-C
16
AI
(+)
17
AI
(-)
18
AC-
ZERO
19
AC-
SPAN
20
AC-
COM
21
FG
22
FG
CELL
(+)
CELL
(-)
TC
(+) TC
(-)
CJ
(+) CJ
(-)
23
DO-1
24
DO-1
25
DO-2
26
DO-2
27
DO-3
28
DO-3
29
DO-4
30
DO-4
31
HTR
32
HTR
33
L
34
N
35
G
36
HTR HTR
Contact
input 2
Contact
input 1
Solenoid valve
for automatic
calibration
Solenoid valve for
automatic calibration
Span gas
Zero gas
Automatic Calibration Unit
Separate-type Zirconia Oxygen Analyzer, ZR402G Converter
Separate-type Zirconia Oxygen Analyzer,
ZR22S Detector
Insulation
resistance tester
Insulation
resistance tester
+ -
+ -
Insulation
resistance tester
Remove
jumper plate
Remove wiring to connect external circuits
and Connect crossover wiring
F3.19E.EPS
+ -
crossover wiring
crossover wiring
Figure 3.19 Insulation Resistance Test