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11 MAINTENANCE
Note. It is possible that the zero reading may drift for
several days after the removal of liquid.
This task should be undertaken as required.
11.4.2 Removal/Replacement of an Indicator Unit
a) Electrically isolate the 6553 display unit.
b) Release the retaining screw through the display facia and
carefully withdraw the chassis from its edge connectors and
out through the front panel. See Fig. 3.1.
c) To replace the unit, carefully insert it into the display facia and
press firmly into position before tightening the retaining
screw.
d) Power up the monitor unit and carry out a calibration in
accordance with Section 8.3.
This task should be undertaken as required.
11.4.3 Error Messages
Table 11.1 shows error message(s) which may occur,
explanation(s) and corrective action(s).
E
r r
r o
M
e
s
s
a
g
e
T
h
N
V
M
e
m
o
y r
E
r r
r o
m
e
d
r u
*
T
o
e r
t c
y f i
a f
u
, t l
s
w
c t i
h
O
O
N
a
g
a
. n i
f I
h t
e
a f
t l u
p
Table 11.1 Error Messages
E
x
p
a l
n
t a
o i
n
e
c
o
n
e t
n
s t
f o
h t
e
n
o
- n
o v
t a l
e l i
m
o
y r
h
s a
n
t o
b
e
e
n
e r
a
d
c
r o
n i
g
p
o
w
r e
u
p
* .
F
, F
w
t i a
1
0
e s
c
o
n
d
s
a
n
d
s
e
s r
t s i
, s
c
o
n
a t
t c
h t
e
C
o
m
p
a
n
12 SPARE PARTS LIST
Warning. Interference
components implies acceptance of responsibility by that
person for ensuring the continuing maintenance of intrinsic
safety requirements. Unauthorized repair, spare parts or
incorrect assembly may render any unit unfit for use within a
hazardous area.
Note. Although the digital display units may be marked
'4600' on their display facia, they are dedicated variants which
are not interchangeable with the Company's standard 4600
Controller/Display. These dedicated display units are identified
(4689 500 or 4689 503) as shown in Fig. 3.1.
When ordering a 6539 960 or 6548 001 katharometer unit, it is
necessary to specify the zero gas in association with the
Company part number. See the typical identification label shown
in Fig. 3.2.
12.1 Consumables
Description
Model 006548 000 & 006548 203
Katharometer Analyser Panels
Granular anhydrous Ca Cl
12.2 Routine Maintenance Parts
e r
c
y l t
Description
w
c t i
h
Model 6553 Gas Monitor Unit
. y
Fuse, 500 mA a/s 20 x 5 mm glass cart.
Function selector switch, 3 position, 2 wafer
Potentiometer (1 kΩ), zero adjustment
Katharometer Analyser Panel
Seal, top of drying chamber
Seal, bottom of drying chamber
Gauze, drying chamber
12.3 Repair Maintenance Parts
Description
Model 4234 Power Supply Unit
Nominal 230 V unit
Nominal 115 V unit
Fuses
F2/F3 – 250 mA/≥1500A h.b.c. cartridge
F1 – 400 mA cartridge
Katharometer Analyser Panel
Flowmeter
Valve, metering
Coupling seal ring
Katharometer unit (H
Katharometer unit (CO
Model 6553 Gas Monitor Unit
Display unit 100%–80/85% H
Display unit 80/85%–100% H
Display unit 0%–100% H
Zener diode safety barrier devices
with
any
unit
Locally sourced
2
006540 203 006548 000
002310 012 002310 012
006519 160
006525 700 006548 018
006540 203 006548 000
006525 460
006525 480
006525 130
)
006539 960K (or J) 006548 001
2
)
006539 960
2
in Air
2
in Air
2
/Air in CO
2
2
or
its
Part No.
Part No.
0231 538
0234 724
002569 036
0211 035
Part No.
4234 500
4234 501
0231577
0231555
0216 485
0216 484
4689 501
4689 503
4689 500
0248 297
41
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