Aztec 600 aluminium, ammonia, color, iron, manganese, phosphate
Single- and multi-stream colorimetric analyzers
4 Installation
IM/AZT6CR–EN Rev. J
19
4.6.4 Replacing the DC Fuse
Referring to Fig. 4.8:
1. Open door to the electronics section by unscrewing the
two door retaining screws
A
a
1
/
4
turn.
2. Use a cross-head screwdriver to remove the four screws
B
and remove the transparent cover plate
C
.
3. Carefully remove the fuse from the fuse holder
D
on the
DC power board
E
.
4. Fit a new fuse (12.5 A 125 V DC Type T, SCHURTER,
Model SPT 5 x 20 Series) into the fuse holder
D
on the
DC power board
E
.
5. Replace the transparent cover plate
C
using the four
screws
B
, close the door to the electronics section and
secure by tightening the two door retaining screws
A
a
1
/
4
turn.
4.6.5 Alarm Relay Contact Protection and Interference
Suppression
If the relays are used to switch loads on or off, the relay contacts
can become eroded due to arcing. Arcing also produces RFI
that can cause analyzer malfunctions and incorrect readings. To
minimize the effects of RFI, arc suppression components are
required; these are resistor/capacitor networks for AC
applications or diodes for DC applications. These components
can be connected across the load.
Maximum relay ratings are:
250 V, 5 A AC, 1250 VA (non-inductive)
30 V, 5 A DC 150 W
For AC applications the value of the resistor/capacitor network
depends on the load current and inductance that is switched.
Initially, fit a 100R/0.022 µF RC suppressor unit. If the analyzer
malfunctions the value of the RC network is too low for
suppression and an alternative value must be used.
For DC applications fit a diode – see Fig. 4.9. For general
applications use an alternative IN5406 type (600 V peak inverse
voltage at 3 A).
Caution.
Only use replacement fuse: 12.5 A 125 V DC
Type T, SCHURTER, Model SPT 5 x 20 Series
Fig. 4.8 Replacing the DC Fuse
Warning.
Isolate the analyzer and cables from electrical
supply.
B
C
A
E
D
Fig. 4.9 Relay Contact Protection
Note.
For reliable switching the minimum voltage must be
>12 V and the minimum current >100 mA.
NC C NO
+
NC C NO
L
N
C
R
Relay Contacts
External AC
Supply
A – AC Applications
B – DC Applications
External
DC Supply
Relay Contacts
Load
Load
Diode
Содержание Aztec 600
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