33
o) Isolate the katharometer unit at its PSU.
p) Make the remaining electrical connections at TB1 of the
katharometer unit – see Fig. 5.5 on page 17.
q) Replace the cover of the katharometer unit.
r)
Power up the katharometer unit from its PSU.
s) Carry out a calibration procedure – see Section 8.3.
Note
. It is possible that the zero reading may drift for
several days after the removal of liquid.
11.4.2
Removal/Replacement of a Display 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 on page 5.
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 display unit and carry out a calibration – see
Section 8.3.
11.4.3
Error Messages
If the error message 'NV Memory Error' is displayed the contents
of the non-volatile memory has not been read correctly during
power up.
To rectify the fault, switch off, wait 10 seconds and switch on
again. If the fault persists, contact the Company.
…11
MAINTENANCE
12
SPARE PARTS LIST
Warning
. Interference with any unit or its components
implies acceptance of responsibility by that person for
ensuring the continuing maintenance of intrinsic safety
requirements. Unauthorized repair/ use of spare parts
or incorrect assembly may render any unit unfit for use
in an intrinsically safe application.
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 502) as shown in Fig.
3.1 on page 5.
When ordering a katharometer unit, it is necessary to specify the
zero gas and range in association with the Company part
number. See the typical identification label shown in Fig. 3.2 on
page 5.
12.1
Consumables
Description
Part No.
Model 006548 000 & 006548 203
Katharometer Analyzer Panels
Granular anhydrous CaCl
2
Sourced locally
12.2
Routine Maintenance Parts
Description
Part No.
Model 6553 Display Unit
Fuse, 500mA a/s 20 x 5 mm glass cartridge
0231 538
Function selector switch, 3 position, 2 wafer
0234 724
Potentiometer (1k ), zer o adjustment
002569 036
Katharometer Analyzer Panel
006540 203 006548 000
Seal, top of drying chamber
002310 012 002310 012
Seal, bottom of drying chamber
006519 160
0211 035
Gauze, drying chamber
006525 700 006548 018
12.3
Repair Maintenance Parts
Description
Part No.
Model 4234 Power Supply Unit
Nominal 230V unit
4234 500
Nominal 115V unit
4234 501
Fuses
F2/F3 – 250mA/ 1500A HBC cartridge
0231577
F1 – 400mA cartridge
0231555
Katharometer Analyzer Panel
006540 203 006548 000
Flowmeter
006525 460
0216 485
Valve, metering
006525 480
0216 484
Coupling seal ring
006525 130
Katharometer unit
006539 960K (or J)
006548 001
Model 6553 Display Unit
Display units (H
2
/CO
2
)
4689 502
Display units (H
2
/Ar)
4689 505
Zener diode safety barrier devices MTL 7055ac
0248 297
Zener diode safety barrier devices MTL 7755ac
0248 296
