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3.1.4 Coding System
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The equipment conforms with the requirements of ATEX directive for class IIC gases to Code EEx ia IIC provided that the equipment
is installed in accordance with instructions provided. The display unit and power supply units must be installed in a safe (non-
hazardous) area, and katharometer panel may be mounted close to the sample point in the hazardous area.
Ordering Code – 6553 Hydrogen Purity and Purge Gas
A Features of Upper Display
6 Two alarms + retrans. 4–20 mA
B Scale of Upper Display
1 100–85% H
in Air
2
2 100–80% H
in Air
2
3 0–100% Air in CO
, 0–100% H
2
4 0–100% Air in CO
, 0–100% H
2
5 85–100% H
in Air
2
6 80–100% H
in Air
2
7 0–100% Air in Ar, 0–100% H
8 0–100% Air in Ar, 0–100% H
C Features of Lower Display
0 Indicator Not Fitted
3 Two alarms + retrans. 4–20 mA
D Scale of Lower Display
0 Indicator Not Fitted
1 0–100% Air in CO
, 0–100% H
2
2 100–85% H
in Air
2
3 100–80% H
in Air
2
4 0–100% Air in CO
, 0–100% H
2
5 0–100% Air in CO
, 0–100% H
2
6 85–100% H
in Air
2
7 80–100% H
in Air
2
A 0–100% Air in Ar, 0–100% H
B 0–100% Air in Ar, 0–100% H
E Range Selector Switch
0 Not fitted
2 Fitted, with facilities for Remote Indication of Switch Position –
only upper display fitted
3 Fitted with two range switches, upper and lower display + remote
indication of selected ranges
F Additional Output Signal – Not Used
6
5
5
/ 3
X
X
A
B
in CO
, 85–100% H
in Air
2
2
2
in CO
, 80–100% H
in Air
2
2
2
in Ar, 85–100% H
in Air
2
2
in Ar, 80–100% H
in Air
2
2
in CO
2
2
in CO
, 85–100% H
in Air
2
2
2
in CO
, 80–100% H
in Air
2
2
2
in Ar, 85–100% H
in Air
2
2
in Ar, 80–100% H
in Air
2
2
X
X
X
X
C
D
E
F
G Language
1 English
2 French
3 German
4 Polish
H Type of Cubicle
1 Without Cubicle.
2 Cubicle – 2 x 3-range only (Ar or CO
4 Cubicle – dual display
5 Cubicle – single display
J Special Features
0 None
9 Fitted
K Mains Supply
1 115 V, 50/60 Hz
2 230 V, 50/60 Hz
Valid Option Combinations (6553/[X])
2
x
[
] X
a r
n
g
A A A A A
6
B B B B B
3
4 ,
7 ,
C C C C C
3
D D D D D
4
5 ,
A ,
E E E E E
3
F F F F F
0
G G G G G
1
o t
H H H H H
1
2 ,
J J J J J
0
9 ,
K K K K K
1
2 ,
3 PREPARATION
X
X
X
X
G
H
J
K
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2
P
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- 3
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6
6
6
8 ,
1
2 ,
5 ,
6 ,
3
4 ,
1
2 ,
0
0
3
B ,
0
0
1
0
2
2
0
0
0
3
1
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3
1
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3
1
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1
5 ,
1
5 ,
1
0
9 ,
0
9 ,
0
1
2 ,
1
2 ,
1
. d
e
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m
5 ,
6 ,
3
4 ,
9 ,
2 ,
7
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